LTC1562 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1562' PDF : 28 Pages View PDF
TYPICAL APPLICATIONS (Basic)
LTC1562
RIN1A
VIN1
RIN3A
VIN3
Quad 3rd Order Butterworth Lowpass Filter, Gain = – 1
RIN1B
CIN1
5V
0.1µF
RIN3B
CIN3
VOUT1
VOUT2
1
20
INV B
INV C
RQ1
2
19
V1 B
V1 C
R21
3
V2 B
18
V2 C
5 V+ LTC1562 V– 16
6
15
SHDN AGND
R23
8
13
V2 A
V2 D
9
V1 A
12
V1 D
RQ3
10
11
INV A
INV D
RIN2B
RQ2
R22
–5V
0.1µF
R24
RQ4
RIN4B
VOUT3
VOUT4
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V –
RIN2A
VIN2
CIN2
RIN4A
VIN4
CIN4
1562 TA05a
Amplitude Response
10
0
–10
–20
–30
–40
–50
–60
10k
f–3dB = 100kHz
100k
FREQUENCY (Hz)
1M
1562 TA05b
Quad 3rd Order
Butterworth
Lowpass Filters
f – 3dB
20kHz
f – 3dB
40kHz
f – 3dB
60kHz
f – 3dB
80kHz
f – 3dB
100kHz
CIN
220pF
1000pF 1000pF 1000pF 1000pF
RINA
44.2k
4.32k
3.16k
2.43k
1.96k
RINB
205k
57.6k
24.3k
13.0k
8.06k
RQ
249k
61.9k
27.4k
15.4k
10.0k
R2
249k
61.9k
27.4k
15.4k
10.0k
All four sections have identical RINA, RINB and CIN values. All resistor values are ±1%
f – 3dB
120kHz
1000pF
1.87k
5.11k
6.98k
6.98k
f – 3dB
140kHz
1000pF
1.69k
3.4k
5.11k
5.11k
13
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