LTC1562 Linear Technology, LTC1562 Datasheet - Page 28

• Manufacturer Part Number: LTC1562
• Description: Very Low Noise/ Low Distortion Active RC Quad Universal Filter
• Manufacturer: Linear Technology

RELATED PARTS
LTC1562
PART NUMBER
LTC1068, LTC1068-X
LTC1560-1
LTC1562-2
28
TYPICAL
V
V
IN2
IN1
5V
0.1 F
R
R
IN3
IN1
Dual 4th Order 12dB Gaussian Lowpass Filter
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
APPLICATION
R23
R
R
R21
Q3
Q1
10
DESCRIPTION
Quad 2-Pole Switched Capacitor Building Block Family
5-Pole Elliptic Lowpass, f
Quad 2-Pole Active RC, 20kHz to 300kHz
1
2
3
5
6
8
9
f
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
C
+
16k
32k
64k
(Hz)
LTC1562
R
R
IN2
IN4
R
AGND
INV C
INV D
V1 C
V2 C
V2 D
V1 D
IN1
26.1k
8.45k
U
V
105k
–
= R
20
19
18
16
15
13
12
11
IN3
C
1562 TA16a
= 1MHz/0.5MHz
R
R22
R24
R
R21 = R23
1 F
Q2
Q4
–
26.1k
6.49k
105k
V
V
OUT2
OUT1
R
Q1
16.9k
8.45k
34k
= R
Q3
R
IN2
1V/DIV
84.5k
16.2k
340k
= R
IN4
– 20
– 40
– 60
– 80
20
0
COMMENTS
Clock-Tuned
No External Components, SO8
Same Pinout as the LTC1562
1
R22 = R24
f
C
84.5k
340k
21k
= 16kHz, Data Clock = 32kHz
4-Level Eye Diagram
Amplitude Response
FREQUENCY (kHz)
10
R
10 s/DIV
f
Q2
C
16.9k
8.45k
f
34k
= 64kHz
C
= R
= 32kHz
LINEAR TECHNOLOGY CORPORATION 1998
f
C
Q4
= 16kHz
1562f LT/TP 0199 4K • PRINTED IN USA
100
1562 TA16b
300
1562 TA16c