LT1319 Linear Technology, LT1319 Datasheet
LT1319
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LT1319 Summary of contents
Page 1
... 1nF 1 F 2.2nF LT1319 Infrared Receiver U SHUTDOWN INPUT IRDA DATA SHARP/NEWTON DATA BYPASS SHDN 0.1 F 30k 10 F DATAL DATA FILT2 DGND AGND LT1319 • TA01 1 ...
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... V (Pin 9) = – 200mV, 1mA Out of Pin 10 (Note 4) V (Pin 7) = – 200mV, 0.1mA Out of Pin 13 (Note 4) V (Pin 9) = 200mV, 800 A Into Pin 10 V (Pin 7) = 200mV, 800 A Into Pin TOP VIEW ORDER PART NUMBER 1 16 BYPASS LT1319CS 3 14 SHDN 4 13 DATAL 5 12 DIG_GND ...
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... Note 4: Measure V (Pin 7) and V (Pin 9). Force these voltages to 200mV below their nominal value to switch the comparators high. Note 5: The current into Pin 11 is multiplied by 4 and then applied to a 500 resistor on the positive comparator inputs. The threshold is . This I (Pin 11) • 4 • 500 . BIAS LT1319 MIN TYP MAX UNITS 2 k ...
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... FREQUENCY (Hz) 1319 G04 U CIRCUIT DESCRIPTIO The LT1319 is a general purpose low noise, high speed, high gain, infrared receiver designed to easily provide IR communications with portable computers, PDAs, desktop computers and peripherals. The receiver takes the photo- current from an infrared photodiode (Siemens BPW34FA or Temic BPV22NF) and performs a current-to-voltage conversion ...
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... LOW FREQUENCY COMPARATOR + g m DIG_GND 4k – 12 GM2 GEN R H2 50k R C3 500 + DATA COMP 500 – HIGH FREQUENCY GM3 COMPARATOR + – FILT2 9 LT1319 • 30k + ...
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... Capacitance on Pin 10 should be minimized as the com- parator output is pulled internal 5k resistor. The associated digital circuitry should be located on the oppo- site side of the PC board from the LT1319 or separated as much as possible if on the same side of the board. Filter components should be located on the analog ground side of the package ...
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... Pin 11. For 100 A into Pin 11, the compara- tor thresholds are nominally 200mV. Power Supply Rejection and Biasing The LT1319 has very high gain and bandwidth so great care is taken to reduce false output transitions due to power supply noise first step the V ...
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... LT1319. This tail can be shown in the following photograph which shows the voltage across a 5k resistor that is connected between the anode of a photo- diode and ground ...
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... FILTIN or FILTINL inputs and is layout dependent. Extending Short Range Performance The short range performance of the LT1319 is normally limited by the photocurrent tail, but in some instances the peak current level cannot be supported by the output of the preamplifier and the input will sag at Pin 2. Typically the maximum input current is 6mA ...
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... LT1319 U U APPLICATIONS INFORMATION current through R which 15k = 182 A where V = 1.9V. At this new level BIAS (0.335V/15k = 22.3 A), Q1 turns on which clamps the preamp output. The collector current of Q1 provides base drive for Q2 which saturates and pulls its collector close to 5V. The FILT1, FILT2L and FILT2 inputs are now pulled ...
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... Q5 SHOULD BE TURNED ON WITH MMBT3904LT1 A HIGH LOGIC INPUT 2. FOR IRDA-SIR, Q6 SHOULD BE TURNED DGND ON WITH A HIGH LOGIC INPUT 3. FOR SHARP ASK 1nF 100 FOR TV REMOTE 33nF BOTTOM LT1319 Q4 2N7002 SHARP OR TV DATA E5 IRDA-SIR/FIR DATA AGND LT1319 • TA02 = 470 H 11 ...
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... LT1319 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 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" ...