LTC1562 Linear Technology, LTC1562 Datasheet - Page 19

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

TYPICAL APPLICATIONS
2nd Order 30kHz Highpass Cascaded with 6th Order 138kHz Lowpass
8th Order Highpass 0.05dB Ripple Chebyshev Filter f
V
IN
V
C
IN
IN
22pF
C
IN1
150pF
V
C
+
IN1
5V
f
150pF
150pF
R
CENTER
R21 56.2k
R23 63.4k
C
0.1 F
C
R
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
Q3
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
TOTAL OUTPUT NOISE = 40 V
C
27pF
IN1
IN3
Q1
IN3
8th Order Wideband Bandpass Filter
R23, 5.23k
R
R21, 110k
R
0.1 F
5V
82.5k
R
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
ALL RESISTORS = 1% METAL FILM
IN3
Q1
59k
Q3
, 30.1k
, 8.06k
, 14k
R21, 35.7k
R
R23, 107k
= 50kHz, – 3dB BW 40kHz to 60kHz
R
0.1 F
Q1
Q3
10
, 10.2k
, 54.9k
1
2
3
5
6
8
9
10
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
1
2
3
5
6
8
9
+
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
C
LTC1562
+
IN4
10
69.8k
1
2
3
5
6
8
9
R
R
R
IN2
LTC1562
IN2
47pF
IN4
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
, 5.23k
+
AGND
, 3.4k
INV C
INV D
V2 D
V1 D
V1 C
V2 C
RMS
LTC1562
V
AGND
INV D
INV C
–
V1 C
V2 C
V2 D
V1 D
V
20
19
18
16
15
13
12
11
U
–
AGND
INV C
INV D
V2 D
V1 D
V1 C
V2 C
20
19
18
16
15
13
12
11
V
–
20
19
18
16
15
13
12
11
R22 34.8k
R24 28.7k
R
R
(Basic)
Q2
Q4
1 F
R
R22, 5.23k
R24, 5.23k
R
Q2
48.7k
R
R22, 66.5k
100k
R24, 127k
R
Q4
0.1 F
–
Q2
Q4
–
, 5.11k
, 3.74k
, 22.1k
, 98.9k
0.1 F
–
CUTOFF
–5V
–5V
V
1562 TA09a
150pF
150pF
C
OUT
C
V
IN4
IN2
V
= 30kHz
1562 TA11a
OUT
–
V
OUT
1562 TA10a
–10
–20
–30
–40
–50
–60
–70
–80
–90
– 10
– 20
– 30
– 40
– 50
– 60
–10
–20
–30
–40
–50
–60
–70
–80
10
10
20
10
0
0
0
1k
10
20
Amplitude Response
Amplitude Response
Amplitude Response
10k
FREQUENCY (kHz)
FREQUENCY (Hz)
FREQUENCY (kHz)
100
100k
1562 TA10b
1562 TA11b
1562 TA09b
1M
400
LTC1562
100
19