LTC1562 Linear Technology, LTC1562 Datasheet - Page 24

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

LTC1562
TYPICAL APPLICATIONS
V
V
24
5V
5V
IN
IN
48.7k
R
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
IN1
R
C
95.3k
5.6pF
IN3
IN3
R
C
IN1
IN1
0.1 F
R
R
R21 31.6k
R23 31.6k
C
294k
18pF
R
IN3
IN3
Q1
Q3
8th Order 50kHz Lowpass Elliptic Filter
30.1k
31.6k
18pF
34k
8th Order 100kHz Elliptic Bandpass Filter
with 100dB Stopband Attenuation
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
0.1 F
R
R21 10.7k
R
R23 10k
Q1
Q3
86.6k
71.5k
10
1
2
3
5
6
8
9
INVB
V1B
V2B
V
SHDN
V2A
V1A
INVA
+
10
1
2
3
5
6
8
9
C
LTC1562
IN2
R
R
INVB
V1B
V2B
V
SHDN
V2A
V1A
INVA
FF2
FF4
+
24pF
301k
332k
LTC1562
AGND
INVC
INVD
V2D
V1D
V1C
V2C
U
V
–
R
R
IN2
IN4
20
19
18
16
15
13
12
11
R
AGND
IN2
–
INVC
INVD
37.4k
95.3k
V2D
V1D
V1C
V2C
V
R
C
(Advanced)
R22 57.6k
R24 32.4k
R
93.1k
R
IN4
IN4
–
Q4
Q2
11.5k
32.4k
10pF
20
19
18
16
15
13
12
11
13k
0.1 F
R
R24 9.53k
R
–
R22 10k
Q2
Q4
84.5k
0.1 F
82.5k
1562 TA12a
– 5V
V
1562 F13a
OUT
– 5V
V
OUT
USES THREE R-C UNIVERSAL NOTCHES AT f
DETAILED DESCRIPTION IN LINEAR TECHNOLOGY DESIGN NOTE 195.
WIDEBAND OUTPUT NOISE 60 V
–100
–120
– 40
– 60
– 30
– 40
– 50
– 60
–70
– 80
– 90
–20
–80
–10
–20
20
10
0
0
25
10
Amplitude Response
Amplitude Response
FREQUENCY (kHz)
FREQUENCY (kHz)
RMS
100
N
= 133kHz, 167kHz, 222kHz.
100
1562 TA13b
1562 TA12b
500
175