LT1319 Datasheet, PDF (1/12 Pages) Linear Technology – Multiple Modulation Standard Infrared Receiver

LT1319
Multiple Modulation Standard
Infrared Receiver
FEATURES
s _{Receives Multiple IR Modulation Methods}
s _{Low Noise, High Speed Preamp: 2pA/√Hz, 7MHz}
s _{Low Frequency Ambient Rejection Loops}
s _{Dual Gain Channels: 8MHz, 400V/V}
s _{25ns and 60ns Comparators}
s _{16-Lead SO Package}
s _{5V Single Supply Operation}
s _{Supply Current: 14mA}
s _{Shutdown Supply Current: 500µA}
s _{External Comparator Threshold Setting}
W
UU
ODULATIO STA DARDS
s _{IRDA: SIR, FIR}
s _Sharp/Newton
s _{TV Remote}
s _{High Data Rate Modulation Methods}
DESCRIPTIO
The LT^®1319 is a general purpose building block that
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
D1*
C_F1
10nF
*BPW34FA OR BPV22NF
IRDA and Sharp/Newton Data Receiver
R_F2
2k
R_F1
1k
L_F1
100µH
C_F3
C_F2
C_B4
100pF
1nF
1µF
1 _{AN_GND}
BYPASS ¹⁶
2 _IN
LT1319 V_CC ¹⁵
3 _FILT1
SHDN ¹⁴
4 _PREOUT
DATAL ¹³
5
V_BIAS
6 _FILTINL
7
FILT2L
DIG_GND ¹²
V_TH ¹¹
DATA ¹⁰
8 _FILTIN
FILT2 ⁹
C_F4
2.2nF
R_T1
30k
C_F5
1µF
SHUTDOWN INPUT
IRDA DATA
SHARP/NEWTON DATA
V_CC
C_B1
0.1µF
C_B2
10µF
C_B3
10µF
C_T1
1µF
DGND
AGND
LT1319 • TA01
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