Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120 IrDA 1.2-co

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Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120 IrDA 1.2-co

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19-1390; 10/98
Low-Profile, 120µA, IrDA Infrared Transceiver
MAX3120 IrDA 1.2-compatible infrared transceiver optimized battery-powered, space-constrained applications. consumes only 120µA while supporting data rates 115kbps over wide 5.5V operating range, features 10nA shutdown mode further extend battery life. MAX3120 reduces space required IrDA applications requiring minimum external components: photodiode, infrared LED, current-setting resistor. Optical components external allow maximum flexibility board design. MAX3120 available 8-pin µMAX packages. µMAX package consumes half board space 8-pin
Features
IrDA Compatible: 2.4kbps 115.2kbps +5.5V Single-Supply Operation Flexible Optics Selection Layout 120µA Supply Current 10nA Shutdown Supply Current 200mA, High-Current Infrared Drive
MAX3120
Ordering Information
PART MAX3120CUA MAX3120CSA MAX3120EUA MAX3120ESA TEMP. RANGE +70°C +70°C -40°C +85°C -40°C +85°C PIN-PACKAGE µMAX µMAX
Applications
IrDA Applications Personal Digital Assistants (PDAs) Palmtop Computers Cell Phones Hand-Held Equipment Peripherals
Typical Operating Circuit
+3.3V
Configuration
VIEW
SCLK DOUT
SHDN
LEDC
MAX3100
MAX3120
PINC
PINC
LEDC PGND SHDN
PGND DIODE
MAX3120
µMAX/SO
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120
ABSOLUTE MAXIMUM RATINGS
(Referred GND) .-0.3V TXD, SHDN, LEDC .-0.3V .-0.3V (VCC 0.3V) PGND .-0.1V +0.1V PINC.10mA Continuous LEDC Current.200mA Repetitive Pulsed LEDC Current (<90µs, duty cycle <20%) .500mA Continuous Power Dissipation +70°C) µMAX (derate 4.1mW/°C above +70°C) .330mW (derate 5.88mW/°C above +70°C) .471mW Operating Temperature Ranges MAX3120C_A.0°C +70°C MAX3120E_A.-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10sec) .+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 +3.0V +5.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C +3.3V.) PARAMETER CHARACTERISTICS Supply Current Shutdown Supply Current LOGIC INPUTS (TXD, SHDN) Input Logic Threshold Input Logic Threshold High Input Leakage Current Input Capacitance LOGIC OUTPUT (RXD) Output Voltage Output Rise Fall Time RECEIVER Supported Data Rates Equivalent Input Noise Current Input Current Sensitivity Ambient Current Rejection Shutdown Time Shutdown Disable Time Receiver Output Pulse Width ISINK 200µA ISOURCE 100µA CLOAD 50pF INOISE (Note (Note 3.3V 5.0V Delay until Delay until maximum receiver data rate valid Data rate 2.4kbps Data rate 115.2kbps 0.0002 0.05 115.2 kbps nARMS ILEAK 3.3V 5.0V +25°C, SHDN (Note 0.01 ICC(SHDN) +25°C, SHDN (Note SYMBOL CONDITIONS UNITS
Low-Profile, 120µA, IrDA Infrared Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(VCC +3.0V +5.5V, TMIN TMAX, unless otherwise noted. Typical values +25°C +3.3V.) PARAMETER TRANSMITTER Transmitter Rise Time Transmitter Fall Time Transmitter Output Resistance Off-Leakage Current SYMBOL CONDITIONS 200mA drive current 200mA drive current 3.3V IOUT 200mA 5.0V 1.15 0.01 UNITS
MAX3120
Note supply current measurements made under following conditions: load outputs, input voltages VCC, diode input current. Note Equivalent input current noise calculated dividing output noise transimpedance amplifier midband transimpedance gain. Note Sensitivity measured with IrDA-compliant input signal, where data rate within Supported Data Rate, rise/fall times less than 600ns, pulse widths between 1.41µs 3/16 baud rate.
Typical Operating Characteristics
+25°C, unless otherwise noted.)
DRIVER ON-RESISTANCE TEMPERATURE
MAX3120 TOC01
SUPPLY CURRENT TEMPERATURE
MAX3120 TOC02
ILEDC 100mA 3.3V
SUPPLY CURRENT (µA)
RLEDC
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT SUPPLY VOLTAGE
MAX3120 TOC03
LEDC VOLTAGE LEDC CURRENT
PULSED DUTY CYCLE
MAX3120 toc04
SUPPLY CURRENT (µA)
VLEDC (mV) 3.3V
SUPPLY VOLTAGE
LEDC CURRENT (mA)
Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
AMBIENT PHOTODIODE CURRENT REJECTION SUPPLY VOLTAGE
MAX3120 TOC05
OUTPUT PULSE WIDTH DISTANCE
TRANSMITTER POWER 200mW/sr INPUT PULSE WIDTH 78µs TEMIC BPV22NF 3.3V
MAX3120 TOC06
OUTPUT PULSE WIDTH DISTANCE
MAX3120 TOC07
CURRENT REJECTION (µA)
PULSE WIDTH (µs) TRANSMITTER POWER 200mW/sr INPUT PULSE WIDTH 1.63µs TEMIC BPV22NF 3.3V
PULSE WIDTH (µs)
SUPPLY VOLTAGE DISTANCE (cm)
DISTANCE (cm)
OUTPUT INFRARED INPUT
MAX3120 toc08
OUTPUT INFRARED INPUT
MAX3120 toc09
2V/div
OUTPUT
2V/div
OUTPUT
2V/div
INFRARED INPUT
2V/div
INFRARED INPUT
2µs/div 3.3V, 115.2kbps DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
100µs/div 3.3V, 2400bps DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
OUTPUT INFRARED INPUT
MAX3120 toc10
OUTPUT INFRARED INPUT
MAX3120 toc11
2V/div
OUTPUT
2V/div
OUTPUT
2V/div
INFRARED INPUT
2V/div
INFRARED INPUT
2µs/div 3.3V, 115.2kbps 10cm DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
100µs/div 3.3V, 2400bps 10cm DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
Low-Profile, 120µA, IrDA Infrared Transceiver
Typical Operating Characteristics (continued)
+25°C, unless otherwise noted.)
OUTPUT INFRARED INPUT OUTPUT INFRARED INPUT
MAX3120
MAX3120 toc12
MAX3120 toc13
2V/div
OUTPUT
2V/div
OUTPUT
2V/div
INFRARED INPUT
2V/div
INFRARED INPUT
2µs/div 3.3V, 115.2kbps DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
100µs/div 3.3V, 2400bps DISTANCE, TERMIC BPV22NF, TRANSMIT POWER 200mW/sr
Description
NAME PINC SHDN PGND LEDC Supply Voltage Ground. Connect anode diode GND. Connect PGND. Diode Cathode Input. Connect cathode diode PINC. Shutdown Input. Active low. Power Ground. Ground driver. Connect PGND GND. Driver Output. Connect cathode IR-emitting LEDC. Receiver TTL/CMOS Data Output. Pulses input pulse. FUNCTION Transmitter TTL/CMOS Data Input. High
Detailed Description
MAX3120 IrDA 1.2-compatible infrared (IR) transceiver. selecting appropriate external optical components (see Photodiode Selection section), MAX3120 will operate data rates 2.4kbps 115kbps distances from Because low-noise design, MAX3120 achieves error rate (BER) below 10-8 maximum data rates when used with appropriate external components. On-chip filtering rejects out-of-band ambient light signals that would otherwise interfere with communication. Also included MAX3120 high-power driver capable sinking 200mA. drive most available LEDs IrDA speeds 2.4kbps 115kbps.
Receiver
MAX3120's receiver amplifier reverse biases diode approximately 1.2V, diode converts pulses light into pulses current. input transimpedance (current-to-voltage) amplifier then converts these current pulses into voltage pulses useful magnitude. MAX3120 filters resulting output voltage pulses remove low-frequency ambient light interference high-frequency circuit noise. Finally, high-speed comparator translates these voltage pulses into usable CMOS output levels (Figure
Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120
LEDC
IPIN (4µW/cm2 )(0.075cm2 )(1.8)(0.95)2 (0.6A/W) 291nA
PGND
BANDPASS FILTER
PINC
BIAS
MAX3120
SHDN
1.2V
first term (4µW/cm2) minimum guaranteed irradiance ±15° angular range. second term (0.075cm2) effective sensitive area diode. factor accounts efficiency increase spherical lens. first 0.95 factor normalizes sensitivity 875nm wavelength, while second 0.95 factor adjusts decreased receiver efficiency ±15° off-axis. last term, 0.6A/W, sensitivity diode. this example, Temic BPV22NF appropriate selection. final important factor selecting diode effective diode capacitance. important keep this capacitance below 70pF 1.2V reverse bias. Higher input capacitance compromise system noise performance increasing noise gain input transimpedance amplifier.
Figure Functional Diagram
Transmitter
MAX3120's transmitter consists high-power switch, capable quickly switching 200mA with less than on-resistance. Internal buffering keeps input capacitance extremely ease input drive requirement. Connect series with current-setting resistor select appropriate output power (see Powering section). Note that transmitter does have automatic shutoff circuit, special attention component power dissipation high-duty-cycle transmit schemes.
Powering
current using external resistor. Consult manufacturer's data sheet select forward current that will meet IrDA specifications discussed Photodiode Selection section. Look drop across (VLED) drop across MAX3120 driver (see Typical Operating Characteristics VLEDC) choose current-setting resistor based following equation: RSET VLED VLEDC ISET
Applications Information
Photodiode Selection
IrDA specification calls transmitter with peak wavelength between 850nm 900nm. Within ±15° half-cone-angle, output intensity must between 40mW/sr 500mW/sr. Outside ±30° half-cone-angle, output intensity must fall below 40mW/sr. optical rise fall times must less than 600ns. Based these system requirements, Hewlett Packard HSDL-4220 Temic TSHF5400 LEDs appropriate choices. Appropriate photodiode selection extremely important system performance. diode must generate least 200nA (minimum sensitivity MAX3120) current when aimed ±15° off-axis with incident irradiance 4µW/cm2. following equation determine Temic BPV22NF meets these requirements:
Using Hewlett Packard HSDL-4220 example, ISET 100mA, VLED 1.67V, therefore: VLEDC 0.08V RSET 32.5
Low-Profile, 120µA, IrDA Infrared Transceiver
Power-dissipation requirements MAX3120, LED, RSET must based maximum duty cycle output current requirements. MAX3120 Power Dissipation ISET VLEDC Duty Cycle Power Dissipation ISET VLED Duty Cycle RSET Power Dissipation ISET2 RSET Duty Cycle
Layout Considerations
MAX3120 requires careful layout techniques minimize parasitic signal coupling PINC input. Keep lead length between photodiode PINC short possible. sure keep board traces diode separate from other noisy traces. minimize coupling, AGND trace adjacent PINC trace both sides. prevent oscillation, avoid routing signal near PINC signal. Connect anode diode, pin, supply bypass capacitor star-ground connection. Connect PGND together. Reduce output trace length from much possible minimize coupling back input parasitic capacitance.
MAX3120
Power-Supply Noise Rejection
Because extremely sensitive nature photodiode amplifiers, important maintain quiet supply voltage. separate analog supply voltage where possible. Place ceramic bypass capacitor close possible. especially noisy systems, connect small (10) resistor series with VCC, addition normal bypass capacitor.
Chip Information
TRANSISTOR COUNT:
Package Information
Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120
Package Information (continued)
SOICN.EPS
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Low-Profile, 120µA, IrDA Infrared Transceiver MAX3120 IrDA 1.2-co

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