®1328 photodiode receiver that supports IrDA® data rates 4Mbps well ot
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LT1328 4Mbps IrDA Infrared Receiver
®1328 photodiode receiver that supports IrDA® data rates 4Mbps well other modulation methods such Sharp remote control. LT1328 MSOP contains necessary circuitry convert current pulses from external photodiode digital output while rejecting unwanted lower frequency interference. LT1328 plus five external components that required make IrDA compatible receiver. Power requirements LT1328 minimal-a single supply quiescent current. Internal highpass filtering attenuates interfering signals such sunlight, incandescent fluorescent lamps selectable high data rates. LT1328's ease flexibility make ideal solution numerous other photodiode receiver applications. LT1328 available SO-8 well tiny MSOP size-critical applications.
registered trademarks Linear Technology Corporation. IrDA registered trademark Infrared Data Association.
SIR, 4ppm Compatible Frequency Ambient Rejection Loop Supply Current: 8-Lead MSOP Packages Single Supply Operation Optional High Frequency Noise Rejection
APPLICATIONS
IrDA Applications Sharp/Newton Remote Noncontact Telemetry Wireless Slave Photographic Flash Keyless Entry Optical Data Transfer Infrared Home Control Systems
TYPICAL APPLICATIONS
IrDA Receiver
1000pF HIGH: LOW: 4ppm (OPTIONAL) OPTIONAL SHUTDOWN CIRCUIT 4.7µF ENABLE *SILICONIX
1328 TA01
LT1328 LIGHT TEMIC BPV22NF 10nF 330pF VBIAS
FILTER MODE FILTER SWITCH DATA DATA
TP0610L*
TRANSMIT INPUT
IrDA Transmitter
4.7µF HSDL-4220* 1/2W 2N7002
*HEWLETT PACKARD
1328 TA02
LT1328
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (VCC GND) Differential Voltage (Any Pins) Operating Temperature Range 70°C Specified Temperature Range 70°C Maximum Junction Temperature 150°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
VIEW FILTER FILTER SWITCH VBIAS MODE DATA
VIEW VBIAS MODE DATA
LT1328CMS8 PART MARKING LTBG
PACKAGE 8-LEAD PLASTIC MSOP TJMAX 150°C, 250°C/
Consult factory Industrial Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER ITH(MIN) Minimum Input Current Pulse CONDITIONS
VGND VMODE unless otherwise specified. (Note
Current (SIR), Pulse Width 1.6µs, Period 8.7µs Current (FIR, 4ppm), Pulse Width 125ns, Period 500ns Current 120Hz, Current Input Signal Input Signal Input Signal Input Signal
IREJECT VBIAS VTHL VTHH
Maximum Input Current Maximum Frequency Input Current Supply Current Operating Supply Voltage Bias Voltage Bias Voltage Quiescent Voltage Switch Logic Level Switch Logic Level High Comparator Output Comparator Output High
Voltage 800µA Sink Current Voltage 50µA Source Current
denotes specifications which apply over full operating temperature range 70°C.
ORDER PART NUMBER LT1328CS8 PART MARKING 1328
FILTER FILTER SWITCH
PACKAGE 8-LEAD PLASTIC
TJMAX 150°C, 190°C/
UNITS
1000
Note package devices designed intended meet commercial temperature range specifications tested 0°C.
LT1328 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current Supply Voltage
CHANGE VOLTAGE (mV)
SUPPLY CURRENT (mA)
OUTPUT PULSE WIDTH INPUT PULSE WIDTH
IPIN1 VPIN7 25°C
SUPPLY VOLTAGE
Change Output Pulse Width Input Duty Cycle
CHANGE VOLTAGE (mV)
OUTPUT PULSE WIDTH INPUT PULSE WIDTH
VFILT 10nF VBIAS 1000pF PULSE PERIOD 8.7µs
IPIN1 150nA IPIN1 10mA
Change Voltage Current
1000
PEAK INPUT CURRENT AMPLITUDE (µA)
CHANGE VOLTAGE
25°C
SOURCING CURRENT
SINKING CURRENT 1000 10000 100000 CURRENT (PIN (µA)
1328
1328
Change Voltage Supply Voltage
IPIN1 25°C
Change Output Pulse Width Input Current Amplitude
VFILT 10nF VBIAS 1000pF INPUT PULSE WIDTHS 8.6µs 0.22µs PULSE PERIOD 8.7µs
SUPPLY VOLTAGE
1000 INPUT CURRENT (µA)
10000
1328
1328
Change Voltage Current
CURRENT SINKING FROM 25°C
CURRENT SOURCING FROM
INPUT DUTY CYCLE
1328
1000 10000 100000 CURRENT (PIN (µA)
1328
Peak Interfering Current Frequency
CBIAS 1000pF CURRENT SOURCED CFILT 330pF CFILT 10nF AREA SIGNAL REJECTION
0.01
FREQUENCY (kHz)
1000
1328
LT1328
FUNCTIONS
(Pin Connect this photodiode cathode. This input preamplifier held 1.5V output servo. maintain 1.5V this pin, servo source sink 40µA this pin. FILTER (Pin Connect capacitor from this ground. value capacitor will band frequencies that will attenuated servo. pole formula 25/(2 330pF capacitor will attenuate photodiode signals below 200kHz when operating high data rates (FIR 4ppm). FILTER SWITCH (Pin Collector Transistor Switch. When MODE switch (Pin HIGH this will switched ground. This used increase filter capacitor slower data rates (SIR). 10nF capacitor from will bring highpass frequency down 6.6kHz SIR. (Pin Ground. DATA (Pin Output Comparator. this indicates that photodiode received pulse light. This will remain HIGH when light signal noise below attenuation band servo. (Pin Supply. bypass capacitor, connected close possible from ground recommended (4.7µF). MODE (Pin HIGH this will cause open collector switch ground. This option that switches extra capacitance lower frequency data rates. this used, select capacitor (C4) accommodate lowest data rate (for IrDA 10nF). VBIAS (Pin 1000pF capacitor from this ground required.
BLOCK DIAGRAM
PHOTODIODE TEMIC BPV22NF
330pF
10nF
1.5V
VBIAS
1000pF
PREAMP
BIAS
MODE FILTER SERVO
HIGH: LOW: 4ppm
FILTER FILTER SWITCH
4.7µF
COMPARATOR
DATA
1328
Figure LT1328 Block Diagram
LT1328
APPLICATIONS INFORMATION
LT1328 noise, high speed, high gain infrared receiver designed easily provide communications with portable computers, PDAs, desktop computers peripherals. receiver takes photodiode current from infrared photodiode (typically Temic BPV22NF) performs current-to-voltage conversion. Figure block diagram LT1328. Photodiode current transformed into voltage feedback resistor RFB. level preamp held VBIAS servo action transconductance amplifier servo action only suppresses frequencies below Rgm, CFILT pole. This highpass filtering attenuates interfering signals such sunlight, incandescent fluorescent lamps. higher data rates, rejection band increased include higher frequencies (Pin LOW). this option used, grounded open. rejection band filter then determined lowest data rate; equals 10nF IrDA (SIR, 4ppm). highpass filter break point capacitor from ground f(Hz) 25/(2 where 60k. 330pF capacitor Figure sets 200kHz corner frequency used data rates above 115kbps. data rates (115kbps below) should HIGH which grounds reduces break frequency with addition capacitor between Pins 10nF capacitor produces 6.6kHz corner. Signals passed preamp/gm amplifier combination cause comparator output swing low. Performance LT1328 circuit Figure extends over full meter range IrDA standard stipulated light levels. IrDA data rates 115kbps below, 1.6µs pulse width used logic zero pulse logic one. Light levels 40mW/SR 500mW/SR. Figure shows scope photo transmitter input (bottom trace) LT1328 output (top trace). Note that input transmitter inverted, i.e., high input light transmitted, which zero output transmitter (Pin MODE (Pin should high these data rates. second fastest tier IrDA standard addresses 576kbps 1.152Mbps data rates with pulse widths interval zero pulse one.
DATA RATES: 2400BAUD 115kbps INTERVAL: 417µs 8.7µs PULSE WIDTH: 3/16 INTERVAL 1.63µs
IrDA-SIR (1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure IrDA-SIR Modulation
DATA IrDA-SIR HIGH LIGHT TRANSMITTED
1328 F02a
IrDA-SIR (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
LT1328
APPLICATIONS INFORMATION
1.152Mbps rate, example, uses pulses 217ns time 870ns. Light levels 100mW/SR 500mW/ over meter range. photo transmitted input LT1328 output shown Figure LT1328 output pulse width will less than 800ns wide over above conditions 1.152Mbps. should held these data rates above. last IrDA encoding method 4Mbps uses pulse position modulation, thus name 4ppm. bits encoded location 125ns wide pulse four positions within 500ns interval bits 1/500ns 4Mbps). Range input levels same 1.152Mbps. Figure shows LT1328 reproduction this modulation.
DATA IrDA-FIR HIGH LIGHT TRANSMITTED DATA RATES: FIXED 1.15Mbps INTERVAL: 870ns PULSE WIDTH: INTERVAL 217ns
1328 F03a
IrDA-FIR (1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure IrDA-FIR Modulation
DATA PAIR 4ppm DATA SYMBOL 1000 0100 0010 0001 DATA IrDA 4ppm HIGH LIGHT TRANSMITTED DATA RATES: FIXED 4Mbps INTERVAL: 500ns PULSE WIDTH: INTERVAL 125ns
1328 F04a
IrDA-4ppm(1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
IrDA-FIR (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
IrDA-4ppm (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure IrDA-4ppm
LT1328
APPLICATIONS INFORMATION
situations where long range requirement, very simple link made using unmodulated (nonreturn zero) data. circuit shown Figure (bit-error rate) transmitter receiver used test data-link error rates data rates 375kbps. Because data have long stretches continuous data, frequency corner LT1328 photodiode receiver 14Hz prevent pulse-top distortion.
4.7µF HSDL 4220 1/2W 2N7002
ERROR RATE TRANSMITTER/RECEIVER 375bps DATA
1328
Figure Simple Data Link
this, make 4.7µF. This only change from standard IrDA-SIR receiver. range (with error rate lower than 108) achieved with additional processing beyond that provided LT1328. caution: when using unmodulated data, possible 100% duty cycle transmitter, sure that handle this.
TEMIC BPV22NF 4.7µF LT1328
4.7µF 1000pF
LT1328
APPLICATIONS INFORMATION
There drawback previous scheme. Lowering highpass frequency 14Hz negates normally excellent ambient light rejection LT1328 lineoperated light sources. modulating data very simple inexpensive ambient light rejection maintained. data used gate 3MHz square wave before driving transmitter. LT1328 FIR-4ppm mode (bandwidth 1MHz 4MHz) will receive 3MHz signal. Thus, frequency response longer required LT1328 configured
HSDL 4220 1/2W 2N7002 100pF ERROR RATE TRANSMITTER/RECEIVER 74LS00 375bps DATA 74LS123 3MHz 74LS123 46.4k 10pF
1328
4.7µF
Figure Simple Data Link with Improved Frequency Noise Rejection
TYPICAL APPLICATIONS
Wireless Slave Photographic Flash
LIGHT FROM MASTER FLASH HAMAMATSU S4797-01 330pF
LT1328
receiver with changes. Note that when FIR/ 4ppm mode, LT1328 excellent rejection activeballast fluorescent lights (40kHz 100kHz) well line operated bulbs. data recovered with stages retriggerable one-shots output LT1328. first one-shot pulse length 80ns acts edge detector second one-shot pulse length 2.3µs, just under symbol period. With this modulation, range extended over still have error rate lower than 108.
TEMIC BPV22NF 100pF LT1328
4.7µF 1000pF
1N4148
SHOE SLAVE FLASH
MPS2907A
4.7µF MPSA42
0.1µF
160524
1328 TA05
Noncontact Voltmeter
TYPICAL APPLICATIONS
INPUT VOLTAGE 200V, ATTACH FREQUENCY COUNTER LTC1440 ADJUST 200Hz LTC1440 10µF HSDL-4220 RANGE: TEMIC BPV22NF 330pF
6.2M
1N4148
LT1328
1000pF
FILM
0.01µF
220pF
4.7µF 10nF
VN2222
VN2222 74HC86
RESISTORS 1/4W UNLESS OTHERWISE NOTED
LS221
FREQUENCY COUNTER
1328 TA06
400V
5.6V
LT1328
LT1328
PACKAGE
0.007 (0.18) 0.021 0.004 (0.53 0.01)
DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.006" (0.152mm) SIDE DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSIONS. INTERLEAD FLASH PROTRUSIONS SHALL EXCEED 0.006" (0.152mm) SIDE
Dimensions inches (millimeters) unless otherwise noted. Package 8-Lead Plastic MSOP
(LTC 05-08-1660)
0.118 0.004* (3.00 0.10)
0.192 0.004 (4.88 0.10)
0.118 0.004** (3.00 0.10)
0.040 0.006 (1.02 0.15) SEATING PLANE
0.006 0.004 (0.15 0.10)
0.012 (0.30)
0.025 (0.65)
MSOP08 0596
LT1328
PACKAGE DESCRIPTION
Dimensions inches (millimeters) unless otherwise noted.
Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.189 0.197* (4.801 5.004)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.053 0.069 (1.346 1.752)
0.004 0.010 (0.101 0.254)
0.016 0.050 0.406 1.270 *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.014 0.019 (0.355 0.483)
0.050 (1.270)
0996
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LT1328
TYPICAL APPLICATIONS
IrDA Receiver
LT1328 BPV22NF* 10nF *TEMIC
1328 TA03
SHDN
FILTER MODE FILTER SWITCH DATA 4.7µF
330pF
RELATED PARTS
PART NUMBER
LT1016 LT1116 LT1319 LT1361
UltraFastPrecision Comparator Single Supply, Ground Sensing Comparator Multiple Modulation Standard Infrared Receiver Dual 4mA, 50MHz, 800V/µs
UltraFast C-Load trademarks Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417 (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 www.linear-tech.com
IrDA Transmitter
1000pF MODE DATA
4.7µF TRANS *HEWLETT PACKARD HSDL-4220* 1/2W 2N7002
1328 TA04
COMMENTS
10ns Prop Delay 12ns Prop Delay Supports IrDA, FIR, Sharp/Newton Remote C-LoadOp Stable with Capacitive Loads
1328f LT/TP 0597 PRINTED
LINEAR TECHNOLOGY CORPORATION 1997
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