28
LTC1562
1562fa
LT/TP REV A 0102 1.5K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
TYPICAL APPLICATION
U
Amplitude Response
FREQUENCY (kHz)
1
–80
GAIN (dB)
–20
0
20
10 100 300
1562 TA16b
–40
–60
f
C
= 64kHz
f
C
= 16kHz
f
C
= 32kHz
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1068, LTC1068-X Quad 2-Pole Switched Capacitor Building Block Family Clock-Tuned
LTC1560-1 5-Pole Elliptic Lowpass, f
C
= 1MHz/0.5MHz No External Components, SO8
LTC1562-2 Quad 2-Pole Active RC, 20kHz to 300kHz Same Pinout as the LTC1562
LTC1563-2/LTC1563-3 4th Order Active RC Lowpass Filters f
CUTOFF(MAX)
= 256kHz, Resistor Programmable
LTC1564 10kHz to 150kHz Digitally Controlled Filter and PGA Continuous Time Low Noise 8th Order with PGA
LTC1565-31 650kHz Continuous Time, Linear Phase Lowpass Filter 7th Order, Differential Inputs and Outputs
LTC1566-1 2.3MHz Continuous Time Lowpass Filter 7th Order, Differential Inputs and Outputs
f
C
(Hz) R
IN1
= R
IN3
R21 = R23 R
Q1
= R
Q3
R
IN2
= R
IN4
R22 = R24 R
Q2
= R
Q4
16k 105k 105k 34k 340k 340k 34k
32k 26.1k 26.1k 16.9k 84.5k 84.5k 16.9k
64k 8.45k 6.49k 8.45k 16.2k 21k 8.45k
1V/DIV
10µs/DIV
1562 TA16c
Dual 4th Order 12dB Gaussian Lowpass Filter
1
2
3
5
6
8
9
10
20
19
18
16
15
13
12
11
INV B
V1 B
V2 B
V
+
SHDN
V2 A
V1 A
INV A
INV C
V1 C
V2 C
V
–
AGND
V2 D
V1 D
INV D
LTC1562
R
IN2
R
IN4
R
IN1
V
IN2
V
IN1
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
–
V
OUT1
1562 TA16a
V
OUT2
R
IN3
5V
R
Q1
R21
R23
0.1µF
1µF
R
Q3
R24
R
Q4
R
Q2
R22
4-Level Eye Diagram
f
C
= 16kHz, Data Clock = 32kHz
