ATION EVALU ILABLE Upstream CATV Amplifier Ultra-Low Power-U

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

ATION EVALU ILABLE Upstream CATV Amplifier Ultra-Low Power-U

Datasheet Thumbnail

Top Searches for this datasheet

19-1398; 5/07
ATION EVALU ILABLE
Upstream CATV Amplifier
Ultra-Low Power-Up/Down Transients, Typical 59dBmV Output Single Supply Output Level Ranges from <8dBmV 64dBmV Gain Programmable Steps Transmit Output Noise Floor: -47dBmV (160kHz Transmit-Disable Output Noise: -70dBmV Power-Down Modes
MAX3510
MAX3510 programmable power amplifier CATV upstream applications. device outputs 64dBmV (continuous wave) through (voltage ratio) transformer. features variable gain controlled 3-wire digital serial bus. Gain control available steps. device operates over frequency range 5MHz 65MHz. MAX3510 offers transmit-disable mode, which places device high-isolation state between bursts TDMA systems. this mode output stage shut off, minimizing output noise. When entering leaving transmit-disable mode, transients kept nominal full gain. addition, supply current reduced 25mA. power-down modes available. Software-shutdown mode permits power-down analog circuitry while maintaining programmed gain setting. Shutdown mode disables circuitry reduces current consumption less than 10µA. MAX3510 available 20-pin QSOP package extended-industrial temperature range (-40°C +85°C).
Ordering Information
PART MAX3510EEP MAX3510EEP+ TEMP RANGE -40°C +85°C -40°C +85°C PIN-PACKAGE QSOP QSOP
+Denotes lead-free package.
Applications
Cable Modems CATV Set-Top Boxes Telephony-Over-Cable CATV Status Monitors
Configuration appears data sheet.
Typical Operating Circuit
CONTROL LOGIC 0.001µF VIN+ VOUT+ INPUT ANTI-ALIAS FILTER SHDN TXEN VCC2 CEXT1 GND2 0.0033µF OUTPUT 0.1µF
MAX3510
0.1µF 0.001µF VINVCC1 GND1 VOUT-
0.1µF 0.1µF
CEXT2 N.C. SCLK
CONTROL LOGIC
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Upstream CATV Amplifier MAX3510
ABSOLUTE MAXIMUM RATINGS
(VCC1, VCC2), VOUT+, VOUT- -0.5V +10.0V Input Voltage Levels (all inputs), CEXT1, CEXT2.-0.3V (VCC 0.3V) Continuous Input Voltage (VIN+, VIN-) .2VP-P Continuous Current (VOUT+, VOUT-).80mA Continuous Power Dissipation +70°C) 20-Pin QSOP (derate 12.3mW/°C above +70°C).1067mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +165°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.
ELECTRICAL CHARACTERISTICS
(VCC +4.75V +5.25V, TXEN SHDN high, -40°C +85°C, unless otherwise noted. input signal applied. Typical parameters +25°C.) PARAMETER Supply Voltage Supply Current Transmit Mode Supply Current Transmit-Disable Mode Supply Current SoftwareShutdown Mode Supply Current Shutdown Mode Input High Voltage Input Voltage Input High Current Input Current SYMBOL VINH VINL IBIASH IBIASL TXEN TXEN low, (Note SHDN low, TXEN 25°C 25°C (Note (Note -100 CONDITIONS 4.75 5.25 UNITS
ELECTRICAL CHARACTERISTICS
(VCC +4.75V +5.25V, TXEN SHDN high, 34dBmV differential, output impedance through transformer, -40°C +85°C, unless otherwise noted. Typical parameters +25°C.) PARAMETER SYMBOL CONDITIONS Gain-control word -40°C +85°C 5MHz 42MHz (Note Gain-control word +85°C Gain-control word -40°C 10MHz (Note Bandwidth Gain Rolloff (Notes Compression Point P1dB f3dB Gain-control word -40°C +85°C 16.7 -0.9 -1.6 20.0 -1.8 20.4 UNITS
Voltage Gain
VOUT 60dBmV, -3dB (Note VOUT 60dBmV, 42MHz VOUT 60dBmV, 65MHz 26dB, 42MHz (Note 5MHz 42MHz (Note -26dB +27dB, -0°C +85°C -26dB +26dB, -40°C
18.0
Output Step Size
Upstream CATV Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VCC +4.75V +5.25V, TXEN SHDN high, 34dBmV differential, output impedance through transformer, -40°C +85°C, unless otherwise noted. Typical parameters +25°C.) PARAMETER Transmit Mode Noise (Note Transmit-Disable Mode Noise Floor Isolation Transmit-Disable Mode TXEN Transient Duration TXEN Transient Step Size (Note Input Impedance Output Impedance Output Return Loss Transmit Mode Output Return Loss Transmit-Disable Mode ZOUT 5MHz 65MHz (Note TXEN low, 5MHz 65MHz (Note +25°C +85°C +25°C +85°C SYMBOL CONDITIONS 160kHz, 26dB 160kHz, -26dB TXEN low, 160kHz, +26dB, 5MHz 65MHz (Note TXEN low, gain control word 65MHz TXEN rise/fall time 0.1µs, +25°C (Note Gain 26dB, +25°C Gain lower, +25°C 5MHz 65MHz, single-ended, +25°C (Note 13.5 13.5 13.9 12.0 12.2 12.7 Input tones 65MHz 65.2MHz, 28dBmV/tone, VOUT 53dBmV/tone, +25°C 33MHz, (Note -40°C +85°C VOUT +54dBmV VOUT +59dBmV degrees UNITS dBmV dBmV mVP-P
MAX3510
Two-Tone Third-Order Distortion (Note
Input tones 40MHz 40.2MHz, 28dBmV/tone, VOUT +54dBmV/tone, +25°C
Harmonic Distortion
65MHz, VOUT +59dBmV, +25°C (Note 22MHz, -40°C +85°C VOUT +54dBmV VOUT +59dBmV
Harmonic Distortion
65MHz, VOUT +59dBmV, +25°C (Note AM/AM AM/PM 26dB, swept from 34dBmV 38dBmV (Note 26dB, swept from 34dBmV 38dBmV (Note
Upstream CATV Amplifier MAX3510
TIMING CHARACTERISTICS
(VCC +4.75V +5.25V, TXEN SHDN high, +25°C, unless otherwise noted.) PARAMETER Rise Setup Time Rise Hold Time Setup Time Hold Time Pulse-Width High Pulse-Width Pulse-Width High Pulse-Width SYMBOL tSENS tSENH tSDAS tSDAH tDATAH tDATAL tSCKH tSCKL COMMENT UNITS
Note Guaranteed design characterization. Note Reference 5MHz. Note Parameters <25°C guaranteed design characterization
Typical Operating Characteristics
(VCC +5V, +34dBmV, TXEN SHDN high, 20MHz, ZLOAD through transformer, +25°C, unless otherwise noted.)
SUPPLY CURRENT TEMPERATURE
MAX3510 toc01
VOLTAGE GAIN SUPPLY VOLTAGE (GAIN STATE
MAX3510 toc02
VOLTAGE GAIN SUPPLY VOLTAGE (GAIN STATE
MAX3510 toc03
-40°C VOLTAGE GAIN (dB)
26.8
SUPPLY CURRENT (mA)
5.25V
VOLTAGE GAIN (dB)
4.75V
-40°C
+25°C +85°C
+25°C
+85°C
TEMPERATURE (°C)
4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE
26.6 4.75 4.85 4.95 5.05 5.15 5.25 SUPPLY VOLTAGE
VOLTAGE GAIN TEMPERATURE (GAIN STATE
MAX3510 toc04
VOLTAGE GAIN FREQUENCY
MAX3510 toc05
VOLTAGE GAIN GAIN-CONTROL WORD
VOLTAGE GAIN (dB) 40MHz 5MHz
MAX3510 toc06
VOLTAGE GAIN (dB)
VOLTAGE GAIN (dB)
GAIN-CONTROL WORD:
5.25V 4.75V
5.0V
1000
GAIN-CONTROL WORD (DECIMAL)
TEMPERATURE (°C)
FREQUENCY (MHz)
Upstream CATV Amplifier MAX3510
Typical Operating Characteristics (continued)
+5V, +34dBmV, TXEN SHDN high, 20MHz, ZLOAD through transformer, +25°C, unless
otherwise noted.)
VOLTAGE GAIN GAIN-CONTROL WORD
MAX3510 toc07
GAIN STEP GAIN-CONTROL WORD
MAX3510 toc08
OUTPUT IMPEDANCE REFERENCE)
MAX3510 toc10
VOLTAGE GAIN (dB) 5MHz 60MHz 40MHz
1.25
1.15 GAIN STEP (dB)
5MHz
1.05 TRANSMIT-DISABLE MODE 0.95 TRANSMIT MODE
0.85 GAIN-CONTROL WORD (DECIMAL) 0.75 GAIN-CONTROL WORD (DECIMAL)
65MHz
OUTPUT RETURN LOSS FREQUENCY
MAX3510 toc11
TRANSMIT OUTPUT NOISE GAIN
MAX3510 toc12
POWER-UP/POWER-DOWN TRANSIENTS OUTPUT LEVEL
MAX3510 toc13
OUTPUT NOISE (dBmV 160kHz)
TRANSIENT LEVEL (mVP-P)
RETURN LOSS (dB) TRANSMIT MODE TRANSMIT-DISABLE MODE
FREQUENCY (MHz)
GAIN (dB) OUTPUT LEVEL (dBmV)
HARMONIC DISTORTION INPUT FREQUENCY OUTPUT LEVEL
MAX3510 toc14
HARMONIC DISTORTION INPUT FREQUENCY
VOUT 48dBmV VOUT 24dBmV VOUT 6dBmV VOUT 60dBmV VOUT 54dBmV
MAX3510 toc15
HARMONIC DISTORTION (dBc) VOUT 6dBmV VOUT 30dBmV VOUT 60dBmV VOUT 57dBmV
HARMONIC DISTORTION (dBc)
FREQUENCY (MHz)
INPUT FREQUENCY (MHz)
Upstream CATV Amplifier MAX3510
Table Reflection Coefficients reference)
FREQUENCY TRANSMIT MODE REAL 0.937 0.937 0.936 0.932 0.932 0.932 0.927 0.922 0.913 0.889 0.850 0.753 IMAG -0.006 -0.007 -0.005 -0.011 -0.018 -0.026 -0.033 -0.054 -0.075 -0.145 -0.249 -0.408 TRANSMIT MODE REAL -0.494 -0.054 0.196 0.183 0.143 0.108 0.059 -0.060 -0.197 -0.420 -0.442 -0.212 IMAG 0.625 0.550 0.199 0.017 -0.081 -0.149 -0.199 -0.257 -0.252 -0.070 0.256 0.543 TRANSMIT DISABLE MODE REAL -0.509 -0.075 0.219 0.244 0.219 0.194 0.158 0.066 -0.049 -0.281 -0.409 -0.327 IMAG 0.623 0.577 0.257 0.062 -0.052 -0.121 -0.175 -0.252 -0.284 -0.207 0.037 0.345
Description
NAME VCC1 GND1 VIN+ VINCS SCLK SHDN N.C. CEXT2 VOUTVOUT+ CEXT1 TXEN VCC2 GND2 Ground Pins Programmable-Gain Amplifier (PGA) Supply. Bypass this GND1 with decoupling capacitor close part possible. Ground. with ground connections, maintain shortest possible (low-inductance) length ground plane. Positive Input. Along with VIN-, this port forms high-impedance differential input PGA. Driving this port differentially will increase rejection second-order distortion output levels. Negative Input. When used, this port must AC-coupled ground. VIN+. Serial-Interface Enable. TTL-compatible input. Serial Interface section. Serial-Interface Data. TTL-compatible input. Serial Interface section. Serial-Interface Clock. TTL-compatible input. Serial Interface section. Shutdown. When this TXEN (pin low, functions (including serial interface) disabled, leaving only leakage currents flow. Connection Output Bypass. This must bypassed ground with 0.1µF capacitor. Negative Output. Along with VOUT+, this port forms impedance output. This port matched load using transformer. Positive Output. VOUT-. Transmit-Disable (Enable) Timing Capacitor. Ramp Generator section. Power-Amplifier Enable. Setting this shuts power amplifier. Power Amplifier Bias, Supply. Bypass this GND2 with decoupling capacitor close part possible. Power Amplifier Bias Ground. with ground connections, maintain shortest possible (low inductance) length ground plane. FUNCTION
Upstream CATV Amplifier MAX3510
VOUT-
SHDN VCC1
BIAS CELL
MAX3510
CEXT2
VOUT+ VIN+
VINPOWER BIAS
VCC2 TXEN
SERIAL DATA INTERFACE SCLK
RAMP GENERATOR
CEXT1
Figure Functional Diagram
Detailed Description
following sections describe blocks shown functional diagram (Figure
Power Amplifier
power amplifier Class differential amplifier capable driving +64dBmV differentially. This architecture provides superior even-order distortion performance requires that transformer used convert single-ended output. transmit-disable mode, power amplifier shut off. internal resistor placed across output, that output impedance remains matched when amplifier transmit-disable mode. Disabling output devices also allows lowest standby noise. achieve proper load line, output impedance power amplifier differential. match this output impedance load, transformer must have turns ratio (voltage ratio) (4:1 impedance ratio). differential amplifier biased directly from supply using center output transformer. This provides significant benefit when switching between transmit mode transmit-disable mode. Stored energy bias currents will cancel within transformer prevent switching transients from reaching load.
Programmable-Gain Amplifier
programmable-gain amplifier (PGA) consists variable-gain amplifier (VGA) digital-to-analog converter (DAC), which provide better than 52dB output level control steps. implemented programmable Gilbertcell attenuator. uses differential architecture achieve maximum linearity. gain determined 6-bit word (D5-D0) programmed through serial data interface (Tables Specified performance achieved when input driven differentially. device driven singleended; however, slight increase even-order distortion result output levels. drive device this manner, input pins must capacitively coupled ground. capacitor value large enough allow low-impedance path ground lowest frequency operation. operation down 5MHz, 0.001µF capacitor suggested.
Upstream CATV Amplifier MAX3510
Ramp Generator
ramp generator circuit simple charging circuit, which used control power-up power-down output power amplifier. made CEXT1 internal resistor. choice CEXT1 governed period burst on/off cycle. CEXT1 must small enough fully charge/discharge within burst. typical value CEXT1 0.0033µF. tions disabled this mode current consumption reduced under 2mA. Shutdown Mode normal operation shutdown (SHDN) held high. When SHDN TXEN taken low, circuits within disabled. Only leakage currents flow this state. Data stored within serial-data interface latches will lost upon entering this mode. Current draw reduced (typ) shutdown mode.
Serial Interface
serial interface active-low enable (CS) bracket data, with data clocked first rising edge SCLK. Data stored storage latch rising edge serial interface controls state PGA. Tables show register format. Serial-interface timing shown Figure
Bias Cell
bias cell accessed SHDN pin. When this taken low, programmable-gain amplifier serial data interface shut off. Note that gain setting stored serial data interface latch will lost. power amplifier unaffected Bias cell, therefore TXEN must held shutdown mode. This mode lowers supply current draw less than typical.
tSENS tSDAS tSDAH tSCLKL
Power Bias Cell
power bias cell used enable disable bias output differential pair. This controlled TXEN (18).
tSCLKH tSENH tDATAH/tDATAL
Figure Serial-Interface Timing Diagram
Functional Modes
MAX3510 four functional modes controlled through serial interface external pins (Table transmit mode, transmit-disable mode, software-shutdown mode, shutdown mode. Transmit Mode Transmit mode normal active mode MAX3510. TXEN must held high this mode. Note that SHDN must also held high. Transmit-Disable Mode When transmit-disable mode, power amplifier completely shut off. This mode activated taking TXEN while keeping SHDN high. This mode typically used between bursts TDMA systems. Transients controlled action transformer balance. Software-Shutdown Mode Software-shutdown mode enabled when TXEN low. This mode minimizes current consumption while maintaining programmed gain state stored latch serial-data interface. analog func8
Table Serial-Interface Control Word
MNEMONIC DESCRIPTION Software Shutdown Test Gain Control, Gain Control, Gain Control, Gain Control, Gain Control, Gain Control,
Upstream CATV Amplifier MAX3510
Table Chip-State Control Bits
SHDN TXEN GAIN STATE (DECIMAL) STATE Shutdown Mode Software-Shutdown Mode Transmit-Disable Mode Transmit Mode Gain -32dB* Gain -31dB* Gain 0dB* Gain 29dB* Gain 30dB*
*Typical gain +25°C
Applications Information
Output Match
MAX3510's output circuit open-collector differential amplifier. on-chip resistor across collectors provides nominal output impedance transmit mode transmit disable mode.
adequate primary inductance must present sustain low-frequency output capability temperatures drop. general this will problem, modern transformers have adequate bandwidth.
Input Circuit
achieve rated performance, input MAX3510 must driven differentially with appropriate input level. differential input impedance approximately 1.5k. Most applications will require differential lowpass filter preceding device. filter design will dictate terminating impedance specified value. Place this load impedance across AC-coupled input pins (see Typical Operating Circuit). MAX3510 sufficient gain produce output level 60dBmV through transformer) when driven with 34dBmV input signal. Rated performance achieved with this input level. When lower input level present, maximum output level will reduced proportionally output linearity will increase. input level greater than 34dBmV used, 3rd-order distortion performance will degrade slightly. single-ended source drives MAX3510, input terminals must capacitively coupled ground (VIN+ VIN-). value this capacitor must large enough look like short circuit lowest frequency interest. operation 5MHz with source impedance, value 0.1µF will suffice.
Transformer
match output MAX3510 load, (voltage ratio) transformer required. This transformer must have adequate bandwidth cover intended application. Note that most transformers specify bandwidth with source primary matching resistance secondary winding. Operating system will tend shift low-frequency edge transformer bandwidth specification factor 1.5, primary inductance. Keep this mind when specifying transformer. Bias output stage provided through center transformer primary. This greatly diminishes on/off transients present output when switching between transmit transmit-disable modes. Commercially available transformers typically have adequate balance between half-windings achieve substantial transient cancellation. Finally, keep mind that transformer core inductance varies proportionally with temperature. application requires temperature extremes (less than 0°C),
Upstream CATV Amplifier
VIN+
1.1pF
VIN-
Figure Equivalent Input Circuit
model MAX3510 input impedance shown Figure
Power-Supply Layout minimal coupling between different sections ideal power-supply layout star configuration. This configuration large-value decoupling capacitor central power-supply node. power-supply traces branch from this node, each going separate power-supply node MAX3510 circuit. each these traces decoupling capacitor that provides very impedance frequency interest. This arrangement provides local powersupply decoupling each power-supply pin. power supply traces must made thick practical keep resistance well below Ground inductance degrades distortion performance. Therefore, ground plane connections GND1 GND2 should made with multiple vias possible.
MAX3510
Layout Issues
well-designed printed circuit board essential part circuit. best performance attention power-supply layout issues well output circuit layout. Output Circuit Layout differential implementation MAX3510's output benefit significantly reducing even-order distortion, most significant which 2nd-harmonic distortion. degree distortion cancellation depends amplitude phase balance overall circuit. critical that traces that lead from output pins exactly same length.
Upstream CATV Amplifier
Configuration
TRANSISTOR COUNT:
VIEW
VCC1 GND1 VIN+ VIN- SCLK GND2 VCC2 TXEN CEXT1
Chip Information
MAX3510
MAX3510
VOUT+ VOUT14 CEXT2 N.C. SHDN
QSOP
Upstream CATV Amplifier MAX3510
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
QSOP.EPS
Revision History
Pages changed
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 2007 Maxim Integrated Products registered trademark Maxim Integrated Products, Inc.

ATION EVALU ILABLE Upstream CATV Amplifier Ultra-Low Power-U

Top Searches for this datasheet

Other recent searches