Download

PDF Abstract Text:

LT1328 4Mbps IrDA Infrared Receiver

, LTC and LT are registered trademarks of Linear Technology Corporation. IrDA is a registered trademark of the Infrared Data Association.

LT1328 4Mbps IrDA Infrared Receiver
FEATURES
DESCRIPTION
, LTC and LT are registered trademarks of Linear Technology Corporation. IrDA is a registered trademark of the Infrared Data Association.
SIR, FIR and 4ppm Compatible Low Frequency Ambient Rejection Loop Supply Current: 2mA 8-Lead MSOP and SO Packages 5V Single Supply Operation Optional High Frequency Noise Rejection
APPLICATIONS
IrDA Applications Sharp / Newton TV Remote Noncontact Telemetry Wireless Slave for Photographic Flash Keyless Entry Optical Data Transfer Infrared Home Control Systems
TYPICAL APPLICATIONS N
IrDA Receiver
C6 1000pF 8 HIGH: SIR LOW: FIR AND 4ppm (OPTIONAL) OPTIONAL SHUTDOWN CIRCUIT 5V C2 4.7µF ENABLE SILICONIX
1328 TA01
LT1328 1 LIGHT IN TEMIC BPV22NF D1 C1 10nF C4 330pF 2 IN VBIAS
7 FILTER MODE 3 FILTER 6 VCC SWITCH 4 5 DATA GND TTL DATA OUT
TP0610L 5V
TRANSMIT INPUT
IrDA Transmitter
VCC C5 4.7µF D2 HSDL-4220 R3 3.9 1 / 2W Q3 2N7002
R1 100 R2 10k
HEWLETT PACKARD
1328 TA02
LT1328
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (VCC to GND) .............. 6V Differential Voltage (Any Two Pins) ............. 6V Operating Temperature Range .......... 0°C to 70°C Specified Temperature Range ........... 0°C to 70°C Maximum Junction Temperature ............. 150°C Storage Temperature Range ......... - 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
PACKAGE / ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW IN FILTER FILTER SWITCH GND 1 2 3 4 8 7 6 5 VBIAS MODE VCC DATA
IN 1 TOP VIEW 8 VBIAS 7 MODE 6 VCC 5 DATA
LT1328CMS8 MS8 PART MARKING LTBG
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER ITH(MIN) Minimum Input Current Pulse CONDITIONS
MIN TYP 200 600
Current Out of Pin 1 (SIR), Pulse Width 1.6µs, Period 8.7µs Current Out of Pin 1 (FIR, 4ppm), Pulse Width 125ns, Period 500ns Current Out of Pin 1 DC to 120Hz, Current Out of Pin 1 No Input Signal No Input Signal No Input Signal No Input Signal
IPD IREJECT IS VS VIN VBIAS VLT VTHL VTHH VOL VOH
Maximum Input Current Maximum Low Frequency Input Current Supply Current Operating Supply Voltage Bias Voltage on Pin 1 Bias Voltage on Pin 8 Quiescent Voltage on Pin 2 Switch Logic Level Low Pin 7 Switch Logic Level High Pin 7 Comparator Output Low Comparator Output High
Voltage On Pin 5, 800µA Sink Current Voltage On Pin 5, 50µA Source Current
The q denotes specifications which apply over the full operating temperature range of 0°C TA 70°C.
ORDER PART NUMBER LT1328CS8 S8 PART MARKING 1328
FILTER 2 FILTER 3 SWITCH GND 4
S8 PACKAGE 8-LEAD PLASTIC SO
UNITS nA nA mA µA
Note 1: MS8 package devices are designed for and intended to meet commercial temperature range specifications but are not tested at 0°C.
LT1328 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
CHANGE IN VOLTAGE ON PIN 1 (mV)
SUPPLY CURRENT (mA)
3 4 5 6 7 8 SUPPLY VOLTAGE (V)
Change in Output Pulse Width vs Input Duty Cycle
CHANGE IN VOLTAGE ON PIN 1 (mV)
Change in Voltage on Pin 2 vs Current
PEAK INPUT CURRENT AMPLITUDE (µA)
CHANGE IN VOLTAGE ON PIN 2 (V)
1.0 SOURCING CURRENT 0.5
0 SINKING CURRENT - 0.5 0.1 1 10 100 1000 10000 100000 CURRENT (PIN 1) (µA)
1328 G06
1328 G01
Change in Voltage on Pin 1 vs Supply Voltage
Change in Output Pulse Width vs Input Current Amplitude
3 4 5 6 7 8 SUPPLY VOLTAGE (V)
100 1000 10 INPUT CURRENT (µA)
1328 G03
1328 G02
Change in Voltage on Pin 1 vs Current
-10 CURRENT SOURCING FROM PIN 1 -20
1328 G04
10 100 1000 10000 100000 CURRENT (PIN 1) (µA)
1328 G05
Peak Interfering Current vs Frequency
10 1 FREQUENCY (kHz)
1328 G07
LT1328
PIN FUNCTIONS
BLOCK DIAGRAM
D1 PHOTODIODE TEMIC BPV22NF
C4 330pF
C1 10nF 3
RFB 50k
VBIAS
8 C6 1000pF
IN RIN 2k
PREAMP
MODE FILTER DC SERVO
HIGH: SIR LOW: FIR AND 4ppm
2 FILTER FILTER SWITCH gm 60k 5V
6 C2 4.7µF
COMPARATOR
1328 BD
Figure 1. LT1328 Block Diagram
LT1328
APPLICATIONS INFORMATION
DATA RATES: 2400BAUD TO 115kbps BIT INTERVAL: 417µs TO 8.7µs PULSE WIDTH: 3 / 16 OF INTERVAL OR 1.63µs
IrDA-SIR (1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure 2. IrDA-SIR Modulation
1328 F02a
IrDA-SIR (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
LT1328
APPLICATIONS INFORMATION
1328 F03a
IrDA-FIR (1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure 3. IrDA-FIR Modulation
1328 F04a
IrDA-4ppm(1m)
RECEIVER OUTPUT
TRANSMITTER INPUT
IrDA-FIR (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
IrDA-4ppm (1cm)
RECEIVER OUTPUT
TRANSMITTER INPUT
Figure 4. IrDA-4ppm
LT1328
APPLICATIONS INFORMATION
In situations where long range is not a requirement, a very simple IR link can be made using unmodulated NRZ (nonreturn to zero) data. The circuit is shown in Figure 5. A BER (bit-error rate) transmitter and receiver was used to test the data-link error rates for data rates of 375kbps. Because the NRZ data can have long stretches of continuous "1" data, the low frequency corner of the LT1328 photodiode receiver is set to 14Hz to prevent pulse-top distortion.
5V C5 4.7µF R1 100 R2 10k D2 HSDL 4220 R3 3.9 1 / 2W Q3 2N7002 24"
BIT ERROR RATE TRANSMITTER / RECEIVER 375bps NRZ DATA OUT IN
1328 F05
Figure 5. Simple NRZ Data Link
1 D1 TEMIC BPV22NF NC C4 4.7µF 2 3 4 LT1328
8 7 6 5 C2 4.7µF C6 1000pF 5V
LT1328
APPLICATIONS INFORMATION
There is one drawback to the previous scheme. Lowering the highpass frequency to 14Hz negates the normally excellent ambient light rejection of the LT1328 to lineoperated light sources. By modulating the data in a very simple and inexpensive way the ambient light rejection can be maintained. The NRZ data is used to gate a 3MHz square wave before driving the transmitter. The LT1328 in FIR-4ppm mode (bandwidth of 1MHz to 4MHz) will receive the 3MHz signal. Thus, the low frequency response is no longer required and the LT1328 can be configured as
1328 F06
C5 4.7µF
R1 100 R2 10k
Figure 6. Simple Data Link with Improved Low Frequency Noise Rejection
TYPICAL APPLICATIONS N
Wireless Slave for Photographic Flash
R1 100 LIGHT FROM MASTER FLASH D1 HAMAMATSU S4797-01 C4 330pF NC
a FIR receiver with no changes. Note that when in FIR / 4ppm mode, the LT1328 has excellent rejection to activeballast fluorescent lights (40kHz to 100kHz) as well as line operated bulbs. The data is recovered with two stages of retriggerable one-shots on the output of the LT1328. The first one-shot pulse length is set to 80ns and acts as an edge detector and the second one-shot pulse length is set to 2.3µs, just under a symbol period. With this modulation, the range can be extended to over 30" and still have a bit error rate lower than 1 in 108.
1 D1 TEMIC BPV22NF NC C4 100pF 2 3 4 LT1328
8 7 6 5 C2 4.7µF C6 1000pF 5V
NC 5V NC R2 1k D2 1N4148 R4 10k R3 10k
TO HOT SHOE OF SLAVE FLASH
Q1 MPS2907A
C2 4.7µF Q2 MPSA42
C5 0.1µF
D3 MUR 160524
1328 TA05
Noncontact Voltmeter
TYPICAL APPLICATIONS N
SET INPUT VOLTAGE TO 200V, ATTACH FREQUENCY COUNTER TO PIN 8 OF LTC1440 AND ADJUST R1 FOR 200Hz 7 LTC1440 C9 10µF R9 16 D2 HSDL-4220 RANGE: 6 FT 14 6 D1 TEMIC BPV22NF NC 5 4 C4 330pF
R2 6.2M
C3 1µF
D3 1N4148
C5 1µF FILM
C7 220pF
5V C2 4.7µF C10 10nF 15
R4 51k
R10 20k 5V 5V 14 1
R6 75k
Q2 VN2222
Q1 VN2222 13 12 11 NC 74HC86
1328 TA06
VIN 20V TO 400V
R7 50k 5W D4 5.6V
LT1328
PACKAGE DESCRIPTION
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
Dimensions in inches (millimeters) unless otherwise noted. MS8 Package 8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.025 (0.65) TYP
MSOP08 0596
LT1328
PACKAGE DESCRIPTION U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.016 - 0.050 0.406 - 1.270 DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.050 (1.270) TYP
SO8 0996
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LT1328
TYPICAL APPLICATIONS N
IrDA Receiver
LT1328 1 D1 BPV22NF C1 10nF TEMIC E1 GND
1328 TA03
FILTER MODE 3 FILTER 6 VCC SWITCH 4 5 DATA GND C2 4.7µF
C4 330pF
RELATED PARTS
PART NUMBER
LT1016 LT1116 LT1319 LT1361
DESCRIPTION
UltraFast Precision Comparator Single Supply, Ground Sensing Comparator Multiple Modulation Standard Infrared Receiver Dual 4mA, 50MHz, 800V / µs Op Amp
UltraFast and C-Load are trademarks of Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
IrDA Transmitter
C6 1000pF JP1 1 2 3 VCC E2 MODE E3 VCC E4 DATA
E5 GND
1328 TA04
COMMENTS
10ns Prop Delay 12ns Prop Delay Supports IrDA, SIR and FIR, Sharp / Newton and TV Remote C-Load Op Amp Stable with All Capacitive Loads
1328f LT / TP 0597 7K · PRINTED IN USA