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2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821 single-chip z


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19-2493; 11/03
2.4GHz 802.11b Zero-IF Transceivers
MAX2820/MAX2821 single-chip zero-IF transceivers designed 802.11b (11Mbps) applications operating 2.4GHz 2.5GHz band. transceivers nearly identical, except MAX2821 provides low-power shutdown mode analog voltage reference output feature MAX2820 does not. transceivers include circuitry required implement 802.11b RF-to-baseband transceiver solution, providing fully integrated receive path, transmit path, VCO, frequency synthesis, baseband/control interface. Only switch, BPF, small number passive components needed form complete radio front-end solution. eliminate need external baseband filters utilizing direct-conversion radio architecture monolithic baseband filters both receiver transmitter. They specifically optimized 802.11b (11Mbps CCK) applications. baseband filtering signal paths support modulation scheme required sensitivity levels. devices suitable full range 802.11b data rates (1Mbps, 2Mbps, 5.5Mbps, 11Mbps) also higher-rate 22Mbps PBCCstandard. MAX2820/MAX2821 available very small 48-lead package.
Features
2.4GHz 2.5GHz Band Operation 802.11b (11Mbps 22Mbps PBCC) Compatible Complete RF-to-Baseband Transceiver Direct-Conversion Upconverters Downconverters Monolithic Low-Phase-Noise Integrated Baseband Lowpass Filters Integrated with 3-Wire Serial Interface Digital Bias Control External Transmit Power Control (Range 25dB) Receive Baseband (Range 65dB) Complete Baseband Interface Digital TX/RX Mode Control Analog Receive Level Detection -97dBm Sensitivity 1Mbps -87dBm Sensitivity 11Mbps +2dBm Transmit Power (11Mbps CCK) Single +2.7V +3.6V Supply Low-Current Shutdown Mode (MAX2821 only) Very Small 48-Pin Package
MAX2820/MAX2821
Applications
802.11b 11Mbps WLAN 802.11b+ 22Mbps PBCC High-Data-Rate WLAN 802.11a Dual-Band WLAN 2.4GHz Band Radios
Ordering Information
PART MAX2820EGM-TD MAX2820ETM+TD MAX2821EGM-TD MAX2821ETM+TD TEMP RANGE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE Lead Free Lead Free
PBCC trademark Texas Instruments, Inc. Configuration/Functional Diagram Typical Application Circuit appear data sheet.
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
ABSOLUTE MAXIMUM RATINGS
Pins .-0.3V +4.2V Inputs: RX_RFP, RX_RFN GND.-0.3V (VCC 0.3V) Outputs: TX_RFP, TX_RFN GND.-0.3V +4.2V Baseband Inputs: TX_BBIP, TX_BBIN, TX_BBQP, TX_BBQN .-0.3V (VCC 0.3V) Baseband Outputs: RX_BBIP, RX_BBIN, RX_BBQP, RX_BBQN .-0.3V (VCC 0.3V) Analog Inputs: RX_AGC, TX_GC, TUNE, ROSCN, ROSCP .-0.3V (VCC 0.3V) Analog Outputs: PA_BIAS, CP_OUT, VREF GND.-0.3V (VCC 0.3V) Digital Inputs: RX_ON, TX_ON, SHDNB, CSB, SCLK, DIN, RF_GAIN, RX_1K GND.-0.3V (VCC 0.3V) Bias Voltages: RBIAS, .+0.9V +1.5V Short-Circuit Duration Digital Outputs: DOUT, RX_DET .10s Input Power: RX_RFN, RX_RFP.+10dBm Continuous Power Dissipation +70°C) 48-Lead (derate 27.0mW/°C above +70°C) .2162mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability. CAUTION! SENSITIVE DEVICE
ELECTRICAL CHARACTERISTICS
(MAX2820/MAX2821 kit: +2.7V +3.6V, RF_GAIN VIH, VTX_GC +2.0V, VRX_AGC +2.0V, RBIAS 12k, input signals baseband inputs, inputs outputs terminated into receiver baseband outputs open, transmitter baseband inputs biased +1.2V, registers default power-up settings, -40°C +85°C, unless otherwise noted. Typical values +2.7V, +25°C, unless otherwise noted.) (Note
PARAMETERS Supply Voltage Shutdown-Mode Supply Current (MAX2821 Only) Standby-Mode Supply Current Receive-Mode Supply Current Transmit-Mode Supply Current SHDNB VIL, RX_ON VIL, TX_ON SHDNB VIH, RX_ON VIL, TX_ON SHDNB VIH, RX_ON VIH, TX_ON SHDNB VIH, RX_ON VIL, TX_ON -40°C +85°C +25°C -40°C +85°C +25°C -40°C +85°C +25°C -40°C +85°C 1.25 -40°C +85°C, ILOAD ±2mA CONDITIONS UNITS
LOGIC INPUTS: SHDNB, RX_ON, TX_ON, SCLK, DIN, CSB, RF_GAIN Digital Input Voltage High (VIH) Digital Input Voltage (VIL) Digital Input Current High (IIH) Digital Input Current (IIL) LOGIC OUTPUTS: DOUT, RX_DET Digital Output Voltage High (VOH) Sourcing 100µA Digital Output Voltage (VOL) BASEBAND RX_AGC Input Resistance Common-Mode Voltage Output Offsets VOLTAGE REFERENCE Reference Voltage Output Output Impedance VRX_AGC +2.0V Sinking 100µA
2.4GHz 802.11b Zero-IF Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(MAX2820/MAX2821 kit: +2.7V +3.6V, RF_GAIN VIH, VTX_GC +2.0V, VRX_AGC +2.0V, RBIAS 12k, input signals baseband inputs, inputs outputs terminated into receiver baseband outputs open, transmitter baseband inputs biased +1.2V, registers default power-up settings, -40°C +85°C, unless otherwise noted. Typical values +2.7V, +25°C, unless otherwise noted.) (Note
PARAMETERS BASEBAND Input Common-Mode Range Input Bias Current Input Impedance TX_GC Input Bias Current TX_GC Input Impedance Reference Oscillator Input Impedance Differential resistance VTX_GC +2.0V Resistance CONDITIONS UNITS
MAX2820/MAX2821
REFERENCE OSCILLATOR INPUT
ELECTRICAL CHARACTERISTICS-RECEIVE MODE
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, receive baseband outputs 500mVP-P, SHDNB RX_ON VIH, TX_ON VIL, VIH, SCLK VIL, RF_GAIN VIH, VRX_AGC +2.0V, RBIAS 12k, +2mA, BWPLL 45kHz, differential input matched registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.) (Note
PARAMETER Frequency Range Frequency Range RF_GAIN VIH, VRX_AGC RF_GAIN VIH, VRX_AGC +2.0V RF_GAIN VIL, VRX_AGC RF_GAIN VIL, VRX_AGC +2.0V Gain Step Noise Figure (Notes Adjacent Channel Rejection Input Third-Order Intercept Point (Note Input Second-Order Intercept Point (Note +25°C -40°C +85°C +25°C +25°C +25°C CONDITIONS 2400 2400 2499 2499 UNITS
RECEIVER CASCADE PERFORMANCE INPUT BASEBAND OUTPUT)
Voltage Gain (Note
From RF_GAIN RF_GAIN =VIL RF_GAIN VIH, gain 80dB RF_GAIN VIH, gain 50dB RF_GAIN VIL, gain 50dB gain 70dB (Note RF_GAIN VIH, gain 80dB RF_GAIN VIL, gain 50dB RF_GAIN VIH, gain 80dB RF_GAIN VIL, gain 50dB
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
ELECTRICAL CHARACTERISTICS-RECEIVE MODE (continued)
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, receive baseband outputs 500mVP-P, SHDNB RX_ON VIH, TX_ON VIL, VIH, SCLK VIL, RF_GAIN VIH, VRX_AGC +2.0V, RBIAS 12k, +2mA, BWPLL 45kHz, differential input matched registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.) (Note
PARAMETER Leakage Input Return Loss BASEBAND FILTER RESPONSE -3dB Frequency Default bandwidth setting (2:0) (010) 12.5MHz Attenuation Relative Passband 16MHz 20MHz 25MHz BASEBAND OUTPUT CHARACTERISTICS Gain Imbalance Phase Quadrature Imbalance Output Compression Output BASEBAND AMPLIFIER Range Slope Response Time BASEBAND PEAK LEVEL DETECTION RF_GAIN VIH, RX_DET RF_GAIN VIL, RX_DET Detector Hysteresis Detector Rise Time With overdrive VRX_AGC +2.0V Peak gain slope 20dB gain step, 80dB 60dB, settling ±1dB dB/V Differential voltage into VOUT 500mVP-P 5.5MHz, 5k||5pF Degrees VP-P With external match RECEIVER BASEBAND CONDITIONS UNITS
Detector Trip Point RX_RF)
signal
ELECTRICAL CHARACTERISTICS-TRANSMIT MODE
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, transmit baseband inputs 400mVP-P, SHDNB TX_ON VIH, RX_ON VIL, VIH, VTX_GC +2.0V, RBIAS 12k, +2mA, BWPLL 45kHz, differential output matched through balun, baseband input biased +1.2V, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.)
PARAMETER Output Frequency Range Output Frequency Range CONDITIONS 2400 2400 2499 2499 UNITS
TRANSMIT SIGNAL PATH: BASEBAND INPUT OUTPUT
2.4GHz 802.11b Zero-IF Transceivers
ELECTRICAL CHARACTERISTICS-TRANSMIT MODE (continued)
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, transmit baseband inputs 400mVP-P, SHDNB TX_ON VIH, RX_ON VIL, VIH, VTX_GC +2.0V, RBIAS 12k, +2mA, BWPLL 45kHz, differential output matched through balun, baseband input biased +1.2V, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.)
PARAMETER CONDITIONS 400mVP-P 5.5MHz, VTX_GC signal (Note +25°C -40°C +85°C -135 22MHz 44MHz VTX_GC +2.0V Peak gain slope VTX_GC +2.0V step dBm/Hz UNITS
MAX2820/MAX2821
Output Power
ACPR (Note
-22MHz fOFFSET -11MHz, 11MHz fOFFSET 22MHz -33MHz fOFFSET -22MHz, 22MHz fOFFSET 33MHz Unwanted sideband 2400MHz 2483MHz 2400MHz 2500MHz 3350MHz 3350MHz fOFFSET 22MHz, VTX_GC +2.0V With external match signal Spurs ±22MHz
In-Band Spurious Signals Relative Modulated Carrier Harmonics Spurious Signal Emissions (Outside 2400MHz 2483.5MHz) Nonharmonic Signals Output Noise Output Return Loss BASEBAND FILTER RESPONSE -3dB Frequency Attenuation Relative Passband GAIN-CONTROL CHARACTERISTICS Gain-Control Range Gain-Control Slope Gain-Control Response Time
dB/V
ELECTRICAL CHARACTERISTICS-PA BIAS
(MAX2820/MAX2821 kit: +2.7V +3.6V, SHDNB VIH, TX_ON VIH, VIH, PA_BIAS enabled, RBIAS 12k, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, unless otherwise noted.)
PARAMETER Resolution Full-Scale Output Current Size Output Voltage Compliance Range Settling Time (Note Relative rising edge CSB, zero fullscale step 0000 1111, settle LSB, load CONDITIONS UNITS Bits
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
ELECTRICAL CHARACTERISTICS-SYNTHESIZER
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, SHDNB VIH, VIH, RBIAS 12k, +2mA, BWPLL 45kHz, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.) (Note
PARAMETER FREQUENCY SYNTHESIZER Frequency Range Reference Frequency Channel Spacing Charge-Pump Output Current Charge-Pump Compliance Range -11MHz fOFFSET 11MHz Reference Spur Level (Note -22MHz fOFFSET -11MHz, 11MHz fOFFSET 22MHz fOFFSET -22MHz, fOFFSET 22MHz Closed-Loop Phase Noise Closed-Loop Integrated Phase Noise Reference Oscillator Input Level VOLTAGE-CONTROLLED OSCILLATOR Tuning Voltage Range Tuning Gain 2400MHz 2499MHz MHz/V fOFFSET 10kHz fOFFSET 100kHz Noise integrated from 100Hz 10MHz, measured TX_RF output AC-coupled sine wave input dBc/Hz °RMS mVP-P R(0) R(0) 2400 2499 CONDITIONS UNITS
ELECTRICAL CHARACTERISTICS-SYSTEM TIMING
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, SHDNB VIH, VIH, RBIAS 12k, +2mA, BWLOOP 45kHz, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.) (Note
PARAMETER Channel-Switching Time CONDITIONS 2400MHz 2499MHz, settles ±10kHz (Note settles within ±30kHz, relative rising edge TX_ON settles within ±30kHz, relative rising edge RX_ON UNITS
RX/TX Turnaround Time
2.4GHz 802.11b Zero-IF Transceivers
ELECTRICAL CHARACTERISTICS-SYSTEM TIMING (continued)
(MAX2820/MAX2821 kit: +2.7V +3.6V, 2400MHz 2499MHz, fOSC 22MHz 44MHz, SHDNB VIH, VIH, RBIAS 12k, +2mA, BWLOOP 45kHz, registers default power-up settings, +25°C, unless otherwise noted. Typical values +2.7V, 2437MHz, fOSC 22MHz, unless otherwise noted.)
PARAMETER Standby-to-Receive Mode Standby-to-Transmit Mode CONDITIONS Standby settles within ±30kHz, relative rising edge RX_ON Standby settles within ±30kHz, relative rising edge TX_ON UNITS
MAX2820/MAX2821
ELECTRICAL CHARACTERISTICS-SERIAL INTERFACE TIMING
(MAX2820/MAX2821 kit: +2.7V +3.6V, registers default power-up settings, +25°C, unless otherwise noted. (Note
PARAMETER SERIAL INTERFACE TIMING (See Figure tCSO tCSS tCSH tCSW tCS1 fCLK SCLK rising edge falling edge wait time Falling edge rising edge first SCLK time Data-to-serial clock setup time Data-to-clock hold time Serial clock pulse-width high Clock pulse-width Last SCLK rising edge rising edge high pulse width Time between rising edge next rising edge SCLK Clock frequency CONDITIONS UNITS
Parameters production tested +25°C only. Min/max limits over temperature guaranteed design characterization. Note Defined baseband differential output voltage divided input voltage balun input). Note Noise-figure specification excludes loss external balun. external balun loss typically ~0.5dB. Note interferer 25MHz offset. Desired signal equals -73dBm. Interferer amplitude increases until baseband output from interferer 10dB below desired signal. Adjacent channel rejection Pinterferer Pdesired. Note Measured balun input. tones -43dBm with 15MHz 25MHz spacing from MAX2820/MAX2821 channel frequency. computed from 5MHz IMD3 product measured output. Note interferers -38dBm with 24.5MHz 25.5MHz spacing from MAX2820/MAX2821 channel frequency. computed from 1MHz IMD2 product measured output. Note Output power measured after matching balun. gain maximum. Note Adjacent alternate channel power relative desired signal. gain adjusted until output power -1dBm. Power measured with 100kHz video 100kHz resolution Note Time required reprogram PLL, change operating channel, wait operating channel center frequency settle within ±10kHz nominal (final) channel frequency. Note Relative amplitude reference spurious products appearing output spectrum relative tone 0.5MHz offset from Note Min/max limits guaranteed design characterization. Note
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Typical Operating Characteristics
(MAX2820/MAX2821 kit, +2.7V, 1MHz, 2450MHz, receive baseband outputs 500mVP-P, transmit baseband inputs 400mVP-P, +2mA, BWPLL 45kHz, differential input/output matched through balun, baseband input biased +1.2V, registers default power-up settings, +25°C, unless otherwise noted.)
SUPPLY CURRENT TEMPERATURE
MAX2820 toc01
SUPPLY CURRENT SUPPLY VOLTAGE
MAX2820 toc02
RECEIVER VOLTAGE GAIN GAIN-CONTROL VOLTAGE
MAX2820 toc03
(mA) RECEIVE, VRF_GAIN
(mA) RECEIVE, VRF_GAIN
VOLTAGE GAIN (dB) VRF_GAIN VOUT 500mVP-P 1MHz 2450MHz VRX_AGC VRF_GAIN
TRANSMIT
RECEIVE, VRF_GAIN
TRANSMIT
RECEIVE, VRF_GAIN
STANDBY
STANDBY
TEMPERATURE (°C)
RECEIVER VOLTAGE GAIN FREQUENCY
MAX2820 toc04
RECEIVER NOISE FIGURE GAIN
MAX2820 toc05
RECEIVER DETECTOR HYSTERESIS INPUT POWER
MAX2820 toc06 MAX2820 toc09
1MHz VOLTAGE GAIN (dB) 2400 2420 2440 2460 2480 VRF_GAIN VIL, VRX_AGC 2.0V VRF_GAIN VIH, VRX_AGC 2.0V
NOISE FIGURE (dB) 1MHz 2450MHz VRF_GAIN VRF_GAIN
HIGH
LOGIC LEVEL
HIGH-GAIN MODE HIGH
LOW-GAIN MODE
2500
(dBm)
FREQUENCY (MHz)
GAIN (dB)
RECEIVER FILTER RESPONSE (1kHz 1MHz)
MAX2820 toc07
RECEIVER FILTER RESPONSE (1MHz 100MHz)
MAX2820 toc08
RECEIVER LEAKAGE SPECTRUM
RECEIVER LEAKAGE POWER (dBm) -100 -120 VRF_GAIN 2400MHz
NORMALIZED RESPONSE (dB) RX_1K RX_1K
NORMALIZED RESPONSE (dB) f-3dB 7.5MHz f-3dB 8.5MHz
1000
FREQUENCY (MHz)
FREQUENCY (GHz)
FREQUENCY (kHz)
2.4GHz 802.11b Zero-IF Transceivers
Typical Operating Characteristics (continued)
(MAX2820/MAX2821 kit, +2.7V, 1MHz, 2450MHz, receive baseband outputs 500mVP-P, transmit baseband inputs 400mVP-P, +2mA, BWPLL 45kHz, differential input/output matched through balun, baseband input biased +1.2V, registers default power-up settings, +25°C, unless otherwise noted.)
RECEIVER BASEBAND OUTPUT SPECTRUM
FREQUENCY (MHz) VRF_GAIN GAIN 50dB 5MHz 2450MHz
MAX2820 toc10
MAX2820/MAX2821
TRANSMITTER OUTPUT POWER FREQUENCY
OUTPUT POWER (dBm) -40°C 2400 2420 2440 2460 2480 2500 FREQUENCY (MHz) +85°C +25°C
MAX2820 toc11
BASEBAND OUTPUT POWER (dBm)
400mVP-P VTX_GC 11Mbps
TRANSMITTER OUTPUT POWER SUPPLY VOLTAGE
MAX2820 toc12
TRANSMITTER OUTPUT SPECTRUM
OUTPUT POWER (dBm) 100kHz 400mVP-P 11Mbps POUT -1dBm
MAX2820 toc13
-40°C OUTPUT POWER (dBm) +25°C +85°C 400mVP-P VTX_GC 11Mbps
FREQUENCY OFFSET FROM CARRIER (MHz)
TRANSMITTER OUTPUT SPECTRUM
MAX2820toc14
TRANSMITTER GAIN GAIN-CONTROL VOLTAGE
-40°C NORMALIZED GAIN (dB) POUT +25°C 400mVP-P 11Mbps VTX_GC +25°C +85°C
MAX2820 toc15
OUTPUT POWER (dBm) SIGNAL 3.3MHz 2450MHz
FREQUENCY (GHz)
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Typical Operating Characteristics (continued)
(MAX2820/MAX2821 kit, +2.7V, 1MHz, 2450MHz, receive baseband outputs 500mVP-P, transmit baseband inputs 400mVP-P, +2mA, BWPLL 45kHz, differential input/output matched through balun, baseband input biased +1.2V, registers default power-up settings, +25°C, unless otherwise noted.)
OPEN-LOOP PHASE NOISE OFFSET FREQUENCY
MAX2820 toc17
TRANSMITTER BASEBAND FILTER RESPONSE
MAX2820 toc16
FREQUENCY TUNING VOLTAGE
2.65 2.60 2.55 FREQUENCY (GHz) 2.50 2.45 2.40 2.35 2.30 +85°C -40°C +25°C PHASE NOISE (dBc/Hz) -100 -110 -120 -130 -140
NORMALIZED RESPONSE (dB)
2450MHz
2450MHz MEASURED OUTPUT
2.25 2.20 FREQUENCY (MHz) VTUNE
1000
OFFSET FREQUENCY (kHz)
CLOSED-LOOP PHASE NOISE OFFSET FREQUENCY
MAX2820 toc19
VCO/PLL SETTING TIME
FREQUENCY ERROR (kHz) BWLOOP 45kHz 2499MHz 2400MHz
MAX2820 toc20
PHASE NOISE (dBc/Hz) -100 -110 -120 -130 100k 2450MHz BWLOOP 45kHz 2.1°RMS
TIME (µs)
OFFSET FREQUENCY (Hz)
MAX2820 toc18
2.4GHz 802.11b Zero-IF Transceivers
Configuration/Functional Diagram
VCC_RMX VCC_BUF RX_BBQN RX_BBQP RX_DET RX_BBIN RX_BBIP RX_AGC
MAX2820/MAX2821
RX_ON
TX_ON
RX_1K
VCC_LNA VREF (MAX2821 ONLY) RF_GAIN RX_RFN RX_RFP VCC_REF RBIAS TX_RFP TX_RFN
SHDNB
PROGRAMMING MODE CONTROL
LEVEL DETECTOR VCC_RXF VCC_LO VCC_VCO TUNE
GND_VCO
MAX2820/ MAX2821
INTEGER-N SYNTHESIZER
DOUT
GND_CP CP_OUT VCC_CP SCLK
PA_BIAS VCC_DRVR TX_GC COMP SERIAL INTERFACE
VCC_TMX
TX_BBIN
TX_BBIP
TX_BBQP
VCC_TXF
TX_BBQN
GND_DIG
VCC_DIG
N.C.
ROSCP
ROSCN
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Description
NAME VCC_LNA N.C. VREF RF_GAIN RX_RFN RX_RFP VCC_REF RBIAS TX_RFP TX_RFN PA_BIAS VCC_DRVR TX_GC VCC_TMX TX_BBIN TX_BBIP TX_BBQP TX_BBQN VCC_TXF GND_DIG DESCRIPTION Supply Voltage LNA. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Connection. internally connected. (MAX2820 only) Voltage Reference Output. (MAX2821 only) Gain Select Logic Input. Logic high high-gain mode, logic low-gain mode. Receiver Negative Input. On-chip AC-coupling. Requires off-chip impedance match connection balun. Receiver Positive Input. On-chip AC-coupling. Requires off-chip impedance match connection balun. Supply Voltage Bias Circuitry Autotuner. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Precision Bias Resistor Pin. Connect precision resistor GND. Transmit Driver Amplifier Positive Output. On-chip pullup choke VCC. Requires off-chip impedance match connection balun. Transmit Driver Amplifier Negative Output. On-chip pullup choke VCC. Requires off-chip impedance match connection balun. Power-Amplifier Bias-Current Control Signal. Analog output. High-impedance, open-drain current source. Connect directly bias-current control input external Supply Voltage Transmit Driver. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Transmit Gain-Control Input. Analog high-impedance input. Connect directly baseband output. Typical Operating Characteristics Transmitter Gain Gain-Control Voltage. Supply Voltage Transmit Mixer VGA. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Transmit Negative In-Phase Baseband Input. Analog high-impedance differential input. Connect directly baseband voltage output. Requires 1.2V common-mode voltage. Transmit Positive In-Phase Baseband Input. Analog high-impedance differential input. Connect directly baseband voltage output. Requires 1.2V common-mode voltage. Transmit Positive Quadrature Baseband Input. Analog high-impedance differential input. Connect directly baseband voltage output. Requires 1.2V common-mode voltage. Transmit Negative Quadrature Baseband Input. Analog high-impedance differential input. Connect directly baseband voltage output. Requires 1.2V common-mode voltage. Supply Voltage Transmit Baseband Filter. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Digital Ground
2.4GHz 802.11b Zero-IF Transceivers
Description (continued)
NAME VCC_DIG N.C. ROSCP DESCRIPTION Supply Voltage Digital Circuitry. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Connection. internally connected. Reference Oscillator Positive Input. Analog, high-impedance differential input. DC-coupled. Requires external AC-coupling. Connect external reference oscillator this analog input. Reference Oscillator Negative Input. Analog, high-impedance differential input. DC-coupled. Requires external AC-coupling. Bypass this analog input ground with capacitor single-ended operation. 3-Wire Serial Interface Data Input. Digital, high-impedance input. Connect directly baseband serial interface CMOS output. (SPI/QSPI/MICROWIRE compatible) 3-Wire Serial Interface Clock Input. Digital, high-impedance input. Connect this digital input directly baseband serial interface CMOS output. (SPI/QSPI/MICROWIRE compatible). 3-Wire Serial Interface Enable Input. Digital, high-impedance input. Connect directly baseband serial interface CMOS output. (SPI/QSPI/MICROWIRE compatible) Supply Voltage Charge Pump. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Charge-Pump Output. Analog, high-impedance output. Current source. Connect directly loop filter input. Charge-Pump Ground. Connect board ground plane. Ground. Connect board ground plane. Frequency Tuning Input. Analog voltage input. High impedance. Connect directly loop filter output. Bias Bypass Pin. Bypass with 2000pF capacitor ground. Supply Voltage VCO. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Important note: Operate separate regulated supply voltage. Supply Voltage VCO, Buffers, Quadrature Circuitry. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Supply Voltage Receiver Baseband Filter. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Active Shutdown Input. Digital CMOS input. High impedance. Connect directly baseband mode control CMOS output. Logic disable device functions. Logic high enable normal chip operation. Serial Interface Data Output. Digital CMOS output. Optional connection. Receiver 1kHz Highpass Bandwidth Control. Digital CMOS input. Connect directly baseband CMOS output. Controls receiver baseband highpass -3dB corner frequency; logic 10kHz, logic high 1kHz. Applications Information section proper this function.
MAX2820/MAX2821
ROSCN
SCLK VCC_CP CP_OUT GND_CP GND_VCO TUNE VCC_VCO
VCC_LO VCC_RXF
SHDNB DOUT RX_1K
QSPI trademarks Motorola, Inc. MICROWIRE trademark National Semiconductor Corp.
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Description (continued)
NAME RX_BBQP DESCRIPTION Receive Positive Quadrature Baseband Output. Analog low-impedance differential buffer output. Connect output directly baseband input. Internally biased 1.2V common-mode voltage drive loads 5pF. Receive Negative Quadrature Baseband Output. Analog low-impedance differential buffer output. Connect output directly baseband input. Internally biased 1.2V common-mode voltage drive loads 5pF. Receive Negative In-Phase Baseband Output. Analog low-impedance differential buffer output. Connect output directly baseband input. Internally biased 1.2V common-mode voltage drive loads 5pF. Receive Positive In-Phase Baseband Output. Analog low-impedance differential buffer output. Connect output directly baseband input. Internally biased 1.2V drive loads 5pF. Receive Level Detection Output. Digital CMOS output. Connect output directly baseband input. Used indicate input level. Logic high input levels above -49dBm (typ). Logic levels below -54dBm (typ). Supply Voltage Receiver Baseband Buffer. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Receiver-On Control Input. Digital CMOS input. Connect baseband mode control CMOS output. Supply Voltage Receiver Downconverter. Bypass with capacitor close possible. share bypass capacitor ground vias with other branches. Transmitter-On Control Input. Digital CMOS input. Connect directly baseband mode control CMOS output. Receive Control. Analog high-impedance input. Connect directly baseband voltage output. Typical Operating Characteristics Gain VRX_AGC. Ground Return Connect board ground plane using multiple vias.
RX_BBQN
RX_BBIN
RX_BBIP
RX_DET
Exposed Paddle
VCC_BUF RX_ON VCC_RMX TX_ON RX_AGC
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
tCSO tCSS SCLK DOUT tCS1 tCSH tCSW
Figure MAX2820/MAX2821 Serial Interface Timing Diagram
Table Operating Mode Truth Table
OPERATING MODE Shutdown Standby Receive Transmit MODE CONTROL INPUTS SHDNB TX_ON RX_ON RX_PATH CIRCUIT BLOCK STATES TX_PATH PLL/VCO/LO GEN.
Operating Modes
MAX2820/MAX2821 have four primary modes operation: shutdown, standby, receive active, transmit active. modes controlled digital inputs SHDNB, TX_ON, RX_ON. Table shows operating mode digital mode control input.
values time. Refer serial interface specification details.
Receive Mode
Receive mode enabled driving digital inputs SHDNB high, RX_ON high, TX_ON low. receive mode, receive circuit blocks powered VCO, PLL, autotuner circuits powered None transmit path blocks active this mode. Although receiver blocks turn quickly, offset nulling requires ~10µs settle. receiver signal path ready ~10µs after low-to-high transition RX_ON.
Shutdown Mode
Shutdown mode achieved driving SHDNB low. shutdown mode, circuit blocks powered down, except serial interface circuitry. While device shutdown, serial interface registers still loaded applying digital supply voltage (VCC_DIG). previously programmed register values preserved during shutdown mode, long VCC_DIG applied.
Transmit Mode
Transmit mode achieved driving digital inputs SHDNB high, RX_ON low, TX_ON high. transmit mode, transmit circuit blocks powered VCO, PLL, autotuner circuits powered None receive path blocks active this mode. Although transmitter blocks turn quickly, baseband offset calibration requires ~2.2µs complete. addition, driver amplifier ramped from low-gain state (minimum output) highgain state (peak output) over next 2µs. transmit signal path ready ~4µs after low-tohigh transition TX_ON.
Standby Mode
Standby mode achieved driving SHDNB high, RX_ON, TX_ON low. standby mode, PLL, VCO, generator, buffer, quadrature, filter autotuner powered default. standby mode intended provide time slower-settling circuitry (PLL autotuner) turn settle correct frequency before making active. 3-wire serial interface active load register
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Table Programming Register Definition Summary (Address Data)
ADDRESS BITS REGISTER NAME ENABLE SYNTH CHANNEL RECEIVE TRANSMIT DATA BITS
Don't care.
Programmable Registers
MAX2820/MAX2821 contain programmable registers control various modes operation major circuit blocks. registers programmed through 3-wire SPI/QSPI/MICROWIRE-compatible serial port. MAX2820/MAX2821 include five programmable registers: Block-enable register Synthesizer register Channel frequency register Receiver settings register Transmitter settings register Each register consists bits. four most significant bits (MSBs) register's address. twelve least significant bits (LSBs) used register data. Table summarizes register configuration. detailed description each register provided Tables 3-6. Data shifted first. data sent MAX2820/MAX2821, 16-bit words, framed CSB. When low, clock active data shifted with rising edge clock. When transitions high, shift register latched into register selected contents address bits. Only last bits shifted into MAX2820/MAX2821 retained shift register. check made number clock pulses. Figure documents serial interface timing MAX2820/MAX2821.
register described Table Note: Putting shutdown mode does change contents programming registers.
Block-Enable Register
block-enable register permits individual control enable state each major circuit block MAX2820/MAX2821. actual enable condition circuit block logical function block-enable setting other control input states. Table documents logical definition state each major circuit block.
Synthesizer Register
synthesizer register (SYNTH) controls reference frequency divider charge-pump current PLL. Table description settings.
Channel Frequency Register
channel frequency register (CHANNEL) sets carrier frequency MAX2820/MAX2821. channel programmed number from actual frequency 2400 channel MHz. default setting 2437MHz. Table description settings.
Receiver Settings Register
receive settings register (RECEIVE) controls receive filter -3dB corner frequency, level detector midpoint, offset nulling parameters. defaults intended provide proper operation. However, filter frequency detector modified desired. reprogram offset nulling parameters. These settings were optimized during development. Table description settings.
Power-Up Default States
MAX2820/MAX2821 provide power-up loading default states each registers. states loaded VCC_DIG supply voltage transition from default values retained until reprogrammed through serial interface power supply voltage taken default state each
Transmitter Settings Register
transmitter settings register (TRANSMIT) controls 4-bit bias DAC. bits correspond bias current between full scale (~300µA). Table settings.
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Table Register Power-Up Default States
REGISTER ENABLE ADDRESS 0001 DEFAULT 000000011110 FUNCTION Block-Enable Control Settings Synthesizer Settings: Reference frequency Charge-pump current (ICP) phase detector (PD) Channel frequency settings (CF) Receiver Settings: offset nulling parameter (1C) offset nulling parameter (2C) -3dB lowpass filter bandwidth (BW) Detector midpoint level (DL) Special function (SF) Transmit Settings: bias (PA)
SYNTH
0010
000001000000
CHANNEL
0011
000000100101
RECEIVE
0100
111111010010
TRANSMIT
0101
000000000000
Table Block-Enable Register (ENABLE)
ADDRESS DATA CONTENT DEFAULT 0001 E(5) E(4) E(3) E(2) E(1) E(0) E(11) E(10) E(9) E(8) E(7) E(6) Reserved Bias-Control Enable (PAB_EN) PAB_EN SHDNB (E(10) TX_ON) Transmit Baseband Filters Enable (TXFLT_EN) TXFLT_EN SHDNB (E(9) TX_ON) Upconverter Driver Enable (TXUVD_EN) TXUVD_EN SHDNB (E(8) TX_ON) Receive Detector Enable (DET_EN) DET_EN SHDNB (E(7) RX_ON) Downconverter Filters Amps Enable (RXDFA_EN) RXDFA_EN SHDNB (E(6) RX_ON) Receive Enable (RXLNA_EN) RXLNA_EN SHDNB (E(5) RX_ON Autotuner Enable (AT_EN) AT_EN SHDNB (E(4) RX_ON TX_ON) Charge-Pump Enable (CP_EN) CP_EN SHDNB E(3) Enable (PLL_EN) PLL_EN SHDNB E(2) Enable (VCO_EN) VCO_EN SHDNB E(1) Reserved DESCRIPTION LOGICAL DEFINITION
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Table Synthesizer Register (SYNTH)
ADDRESS DATA D11:D8 CONTENT DEFAULT 0000 Reserved Phase-Detector Polarity Select phase inversion permitted Charge-Pump Current Select ±1mA charge-pump current ±2mA charge-pump current Reference Frequency Divider 000000 22MHz 000001 44MHz DESCRIPTION
0010
D5:D0
R(5:0)
000000
Table Channel Frequency Block Register (CHANNEL)
ADDRESS DATA D11:D7 CONTENT DEFAULT 00000 Reserved Channel Frequency Select: (2400 CF(6:0))MHz 0000000 2400MHz 0000001 2401MHz 1100010 2498MHz 1100011 2499MHz DESCRIPTION
0011
D6:D0
CF(6:0)
0100101
Applications Information
Receive Path
MAX2820/MAX2821 RX_RF inputs highimpedance differential inputs AC-coupled on-chip LNA. inputs require external impedance matching differential single-ended conversion. balanced single-ended conversion interface achieved through off-chip balun transformer, such small surface-mount baluns offered Murata Toko. case balun, input must impedancematched differential/balanced impedance 100. simple network sufficient impedance-match balun. Typical Application Circuit shows balun, inductors, capacitors that constitute matching network. Refer MAX2820/ MAX2821 schematic component values matching network. line lengths parasitics have noticeable impact matching element values board-level circuit. Some empirical adjustment component values likely. Balanced line layout differential input traces essential maintaining good performance common-mode noise rejection.
MAX2820/MAX2821 have gain modes that digitally controlled logic signal applied RF_GAIN. RF_GAIN high enables high-gain mode, RF_GAIN enables low-gain mode. gain step nominally 30dB. most applications, RF_GAIN connected directly CMOS output baseband baseband controls state gain based detected signal amplitude. Receiver Baseband Lowpass Filtering MAX2820/MAX2821 on-chip receive lowpass filters provide steep filtering necessary attenuate out-of-band 11MHz) interfering signals sufficiently levels preserve receiver sensitivity. filter frequency response precisely controlled on-chip does require user adjustment. However, provision made permit -3dB corner frequency entire response slightly shifted down frequency. This intended offer some flexibility trading adjacent channel rejection passband distortion. filter -3dB frequency programmed through serial interface. specific setting -3dB frequency shown Table typical receive baseband filter gain frequency profile shown Typical Operating Characteristics.
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Table Receive Settings Register (RECEIVE)
ADDRESS DATA D11:D9 D8:D6 CONTENT 2C(2:0) 1C(2:0) DEFAULT DESCRIPTION Offset Nulling Parameter Offset Nulling Parameter Level Detector Midpoint Select 50.2mVP 70.9mVP 35.5mVP Special Function Select (not presently used) Receive Filter -3dB Frequency Select (frequencies approximate) 8.5MHz 8.0MHz 7.5MHz 7.0MHz 6.5MHz 6.0MHz
D5:D4
DL(1:0)
0100
SF(0)
D2:D0
BW(2:0)
Table Transmit Settings Register (TRANSMIT)
ADDRESS DATA D11:D4 0101 CONTENT DEFAULT Reserved Bias Select: 1111 Highest bias 0000 Lowest bias DESCRIPTION
D3:D0
PA(3:0)
0000
Receive Gain Control Offset Nulling MAX2820/MAX2821 receive path gain varied through external voltage applied RX_AGC. Maximum gain VRX_AGC minimum gain VRX_AGC RX_AGC input high-impedance analog input designed direct connection RX_AGC output baseband gaincontrol range, which continuously variable, typically 70dB. gain-control characteristic shown Typical Operating Characteristics section graph Receiver Voltage Gain Gain-Control Voltage. Some local noise filtering through simple network input permissible. However, time constant this network should kept sufficiently order limit desired response time gaincontrol function. Receiver Baseband Amplifier Outputs MAX2820/MAX2821 receiver baseband outputs (RX_BBIP, RX_BBIN, RX_BBQP, RX_BBQN) differential low-impedance buffer outputs. outputs
designed directly connected (DC-coupled) in-phase quadrature-phase inputs baseband outputs internally biased +1.2V common-mode voltage. outputs capable driving loads with full bandwidth baseband signals differential amplitude 500mVP-P. Proper board layout essential maintain good balance between traces. This provides good quadrature phase accuracy. Receiver Power Detector MAX2820/MAX2821 receiver level detector digital output from internal threshold detector that used determine when change gain state. most applications, connected directly comparator input baseband threshold level programmed through MAX2820/MAX2821 control software.
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Transmit Path
Transmitter Baseband Inputs MAX2820/MAX2821 transmitter baseband inputs (TX_BBIP, TX_BBIN, TX_BBQP, TX_BBQN) high-impedance differential analog inputs. inputs designed directly connected (DC-coupled) in-phase quadrature-phase outputs baseband inputs must externally biased +1.2V common-mode voltage. Typically, outputs current outputs with external resistor loads ground. nominally driven 400mVP-P differential baseband signal. Proper board layout essential maintain good balance between traces. This provides good quadrature phase accuracy maintaining equal parasitic capacitance lines. addition, important expose circuit board traces going from digital baseband MAX2820/MAX2821. lines should shielded inner layer prevent coupling these inputs possible envelope demodulation signal. Transmit Path Baseband Lowpass Filtering MAX2820/MAX2821 on-chip transmit lowpass filters provide filtering necessary attenuate unwanted higher-frequency spurious signal content that arises from clock feedthrough sampling images. addition, filter provides additional attenuation second sidelobe signal spectrum. filter frequency response on-chip. user adjustment programming required. Typical Gain Frequency profile shown Typical Operating Characteristics. Transmitter Offset Calibration zero-IF system, order achieve leakage output, offset baseband signal path must reduced near zero possible. Given that amplifier stages, baseband filters, possesses some finite offset that large required leakage specification, necessary "null" offset. MAX2820/ MAX2821 accomplish this through on-chip calibration sequence. During this sequence, baseband signal path offsets sampled cancelled baseband amplifiers. This calibration occurs first ~2.2µs after TX_ON taken high. During this time, essential that output differential state. calibration corrects offset. However, value other than state, then offset erroneously sampled MAX2820/MAX2821 offset calibration. output must into differential state before time TX_ON taken high.
Power Amplifier Driver Output MAX2820/MAX2821 TX_RF outputs highimpedance differential outputs directly connected driver amplifier. outputs essentially opencollector outputs with on-chip inductor choke connected VCC_DRVR. power amplifier driver outputs require external impedance matching differential single-ended conversion. balanced single-ended conversion interface achieved through off-chip balun transformer, such from Murata Toko. this case, output must impedance-matched differential/balanced impedance 200. Typical Application Circuit shows balun, inductors, capacitors that constitute matching network power amplifier driver outputs. output match should adjusted until return loss balun output 10dB. Transmit Gain Control transmit gain-control input provides direct analog control over transmit path gain. transmit gain MAX2820/MAX2821 controlled external voltage TX_GC. typical gain-control characteristic provided Typical Operating Characteristics graph Transmitter Gain Control Gain-Control Voltage. input high-impedance analog input designed directly connect output baseband Some local noise filtering through simple network input permissible. However, time constant this network should kept sufficiently desired response time gain-control function limited. During turn-on sequence, internally gain minimum while baseband offset calibration taking place. output effectively "blanked" first 2.2µs after TX_ON taken high. After 2.2µs, "blanking" released, gaincontrol amplifier ramps gain external voltage applied TX_GC input. Bias Output MAX2820/MAX2821 provide programmable analog current source output biasing power amplifier, such MAX2242. output essentially open-drain output current source DAC. output designed directly connect bias current power amplifier. value current determined bits programmed into internal register MAX2820/MAX2821. This programmability permits optimizing power amplifier idle current based output power level Care must taken layout this line. Avoid running line parallel with line. might couple
2.4GHz 802.11b Zero-IF Transceivers
onto line, given high impedance output. This might result rectified altering value bias current causing erratic operation. Loop Filter uses classical charge pump into external loop filter (C-RC) which filter output connects voltage tuning input VCO. This simple thirdorder lowpass loop filter closes loop around synthesizer. Typical Application Circuit shows loop filter elements around MAX2820/MAX2821.The capacitor resistor values provide loop bandwidth required achieve desired lock time while also maintaining loop stability. Refer MAX2820/MAX2821 schematic component values. 45kHz loop bandwidth recommended ensure that loop settles quickly enough achieve turnaround time 10µs turnaround time. This loop filter kit. Narrowing loop bandwidth increases settling time results unacceptable TX-RX turnaround time performance.
MAX2820/MAX2821
Synthesizer
Channel Frequency Reference Frequency synthesizer/PLL channel frequency reference settings establish divider/counter settings integer-N synthesizer MAX2820/MAX2821. Both channel frequency reference oscillator frequency programmable through serial interface. channel frequency programmed channel number carrier frequency 2400MHz 2499MHz frequency channel 2400). reference frequency programmable 22MHz 44MHz. These settings intended cover only required 802.11b channel spacing possible crystal oscillator options used radios. Reference Oscillator Input reference oscillator inputs ROSCP ROSCN high-impedance analog inputs. They designed connected reference oscillator output through coupling capacitor. input amplitude range from 200mVP-P 500mVP-P; therefore, case reference oscillator with CMOS output, signal must attenuated before being applied ROSC inputs. signal attenuated with resistor- capacitor-divider network. Reference Voltage Output voltage reference output provided from VREF, with certain baseband ICs. nominal output voltage 1.2V. reference voltage firstorder compensated over temperature provide reasonably drift output, 1.1V 1.3V over temperature, under load conditions. output stage designed drive loads with 20pF load capacitance. VREF output designed directly connect baseband reference input.
Chip Information
TRANSISTOR COUNT: 13,607
2.4GHz 802.11b Zero-IF Transceivers MAX2820/MAX2821
Typical Application Circuit
DIGITAL MODE CONTROL SIGNALS FROM/TO BASEBAND ANALOG OUTPUT SIGNAL DIGITAL MODE CONTROL SIGNALS TO/FROM BASEBAND BASEBAND
OUTPUT FROM BASEBAND
VCC_RMX
VCC_BUF
RX_BBQN
RX_BBQP
RX_DET
RX_BBIN
RX_BBIP
RX_AGC
RX_ON
TX_ON
RX_1K
VCC_LNA OPTIONAL CONNECTION BASEBAND VREF (MAX2821 ONLY) GAIN-CONTROL SIGNALS TO/FROM BASEBAND RF_GAIN RX_RFN
DOUT
SHDNB VCC_RXF VCC_LO VCC_VCO TUNE GND_VCO GND_CP CP_OUT LOOP FILTER VCC_CP SCLK
PROGRAMMING MODE CONTROL
LEVEL DETECTOR
INPUT FROM SWITCH
RX_RFP VCC_REF RBIAS TX_RFP
TX_GC OUTPUT FROM BASEBAND
MAX2820/ MAX2821
INTEGER-N SYNTHESIZER
OUTPUT SWITCH
TX_RFN PA_BIAS VCC_DRVR
BIAS INPUT
COMP
SERIAL INTERFACE
SERIAL INTERFACE BASEBAND
VCC_TMX
TX_BBIN
TX_BBIP
TX_BBQP
TX_BBQN
VCC_TXF
GND_DIG
N.C.
VCC_DIG
ROSCP
REFERENCE OSCILLATOR INPUT ANALOG INPUT SIGNAL FROM BASEBAND
ROSCN
2.4GHz 802.11b Zero-IF Transceivers
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
QFN.EPS
MAX2820/MAX2821
PACKAGE OUTLINE 32,44,48L QFN, 7x7x0.90
21-0092
PACKAGE OUTLINE, 32,44,48L QFN, 7x7x0.90
21-0092
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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