1

LT1319

S

FEATURE

DESCRIPTIO

The LT

contains all the circuitry necessary to transform modu-

lated photodiode signals back to digital signals. The

circuit’s flexibility permits it to receive multiple modulation

methods. A low noise, high frequency preamplifier per-

forms a current-to-voltage conversion while rejecting low

frequency ambient interference with an AC coupling loop.

Two separate high impedance filter buffer inputs are

provided so that off-chip filtering can be tailored for

specific modulation schemes. The filter buffers drive sepa-

rate differential gain stages that end in comparators with

internal hysteresis. The comparator thresholds are adjust-

able externally by the current into Pin 11. One channel has

a high speed 25ns comparator required for high data rates.

The second channel’s comparator has a 60ns response

time and is well suited to more modest data rates. A power

saving shutdown feature is useful in portable applications.

For IRDA 4PPM contact the LTC Marketing Department.

Multiple Modulation Standard

Infrared Receiver

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Receives Multiple IR Modulation Methods

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Low Noise, High Speed Preamp: 2pA/

√Hz, 7MHz

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Low Frequency Ambient Rejection Loops

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Dual Gain Channels: 8MHz, 400V/V

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25ns and 60ns Comparators

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16-Lead SO Package

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5V Single Supply Operation

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Supply Current: 14mA

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Shutdown Supply Current: 500

µA

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External Comparator Threshold Setting

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IRDA: SIR, FIR

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Sharp/Newton

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TV Remote

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High Data Rate Modulation Methods

ODULATIO STA DARDS

IRDA and Sharp/Newton Data Receiver

AN_GND

IN

FILT1

PREOUT

FILTINL

FILT2L

FILTIN

LT1319

SHUTDOWN INPUT

IRDA DATA

SHARP/NEWTON DATA

30k

0.1

µF

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

10

µF

10

µF

1

µF

2.2nF

1

µF

100

µH

1

µF

AGND

DGND

LT1319 • TA01

10nF

100pF

1nF

2k

1k

D1*

BYPASS

SHDN

DATAL

DIG_GND

DATA

FILT2

*BPW34FA OR BPV22NF

, LTC and LT are registered trademarks of Linear Technology Corporation.