LT1490C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1490C' PDF : 12 Pages View PDF
LT1490/LT1491
TYPICAL APPLICATION
Ring-Tone Generator
R2
47k
R3
10k
C2
0.47µF
3+
R1 1/4 LT1491
33k 2 –
D1
1 1N4148
C1
R4
1µF 1.6M
CADENCE OSCILLATOR
R5
100k
R6
10k
C3
0.047µF
5+
R9
7 300k
1/4 LT1491
R11
10k 10 +
6–
R7
16k
8
1/4 LT1491
C4
9–
0.068µF
R8
620k
20Hz OSCILLATOR
R12
R10 SMOOTHING FILTER 10k
620k
C5
R13
0.01µF
130k
60V
Q1
IRF628
R16
100k
Q3
2N3904
Z1
R17
15V
620Ω
100k
13 –
4
1/4 LT1491
12 +
R14
10k
R24
11 420
14
C7
47µF
R18
100Ω
R23
4.7k
R15
R25
47k
4.7k
R26
2k
OPTO1*
Q5
2N3904
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
OFF HOOK DETECTION
Q2
IRF9620
POWER AMPLIFIER
–180V
Z2
15V
R20
100k
R19
620Ω
UP TO
LOAD TEN
PHONES
Q4
2N3906
R21
150Ω
C6
0.033µF
1490/1491 TA03
RELATED PARTS
PART NUMBER
LT1078/LT1079
DESCRIPTION
Dual/Quad 55µA Max, Single Supply, Precision Op Amps
LTC1152
Rail-to-Rail Input, Rail-to-Rail Output, Zero-Drift Amplifier
LT1178/LT1179
Dual/Quad 17µA Max, Single Supply, Precison Op Amps
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
C-Load is a trademark of Linear Technology Corporation.
COMMENTS
Input/Output Common Mode Includes Ground, 70µV VOS(MAX)
and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
High DC Accuracy, 10µV VOS(MAX), 100nV/°C, 1MHz GBW,
1V/µs Slew Rate, Supply Current 2.2mA (Max), Single Supply,
Can Be Configured for C-LoadTM Operation
Input/Output Common Mode Includes Ground, 70µV VOS(MAX)
and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900
FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
14901fa LT/TP 0897 4K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1996
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