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