LTC1562CG#PBF Linear Technology, LTC1562CG#PBF Datasheet - Page 15

• Manufacturer Part Number: LTC1562CG#PBF
• Description: IC FILTER UNIV RC QUAD LN 20SSOP
• Manufacturer: Linear Technology

Specifications of LTC1562CG#PBF

• Filter Type: Universal, Continuous-Time
• Frequency - Cutoff Or Center: 150kHz
• Number Of Filters: 4
• Max-order: 8th
• Voltage - Supply: 4.75 V ~ 10.5 V, ±4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TYPICAL APPLICATIONS
V
5V
IN
0.1 F
R
IN1
R22 = R
R24 = R
R21 = R
R23 = R
Notes: f
Chebyshev formulas (R21 and R24) should be rounded to the nearest standard finite-tolerance value before computing
the values dependent on them (R
Example: Chebyshev response, f
Using this 1% value gives R
R22 = R
standard 1% value. R
R
Quick Design Formulas for Some Popular Response Types:
(Maximally Flat Passband)
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V
0.1dB passband ripple up to 0.95 f
IN4
for f
R
R21
R23
R
Q1
R
Q3
R
Q4
= 12.14k, nearest 1% value 12.1k. R
R
C
Q1
Q3
Butterworth
IN2
IN4
IN1
R
IN3
C
10kHz to 140kHz
= 25.63k
IN2
8th Order Lowpass Filters
= 6.01k
Q2
is the cutoff frequency: For Butterworth and Bessel, response is 3dB down at f
= 5.1k
10
= 10k
= 10k
1
2
3
5
6
8
9
= 10k
= 10k
= 14.99k, nearest 1% value 15k. R
= 9k
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
+
LTC1562
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
R
R
R
IN2
IN3
IN4
Q3
C
C
C
C
C
C
C
C
AGND
INV D
INV C
= 18.75k, nearest 1% value 18.7k. R24 = 26.7k, already a standard 1% value. This gives
V2 D
V1 D
V1 C
V2 C
2
2
2
2
V
–
IN1
20
19
18
16
15
13
12
11
U
= 16.5k, already a standard 1% value. R
C
IN1
= 100kHz. The formulas above give R21 = 7.51k, nearest standard 1% value 7.50k.
C
and R
, use LTC1562 “A” grade. *The resistor values marked with an asterisk (*) in the
0.1 F
R22 = R
R23 = R
(Basic)
Q4
R22
IN4
R
R
R24
Q2
–
Q4
= 8.75k, nearest 1% value 8.66k.
–5V
R21 = 7.51k
R
R
R
R24 = 26.7k
R
Q2
respectively).
IN2
IN3
Q1
Q2
Q3
Q4
= 11.02k, nearest 1% value 11k. R23 = R
= 119.3k
= 14.99k
= 279.9k
= 7.15k
= 118.1k
= 8.75k
for f
(Equiripple Passband)
1562 TA04a
V
C
OUT
Chebyshev
20kHz to 120kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
C
C
C
C
C
C
C
C
2
2
, R
, R
2
2
IN1
IN4
C
C
C
Q1
100kHz
100kHz
100kHz
+ 2440kHz
+ 560kHz
+ 530kHz
=
= 2.2R21*
= 18.075k, nearest 1% value 18.2k.
R24*
2.2
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
0
10k
C
. For Chebyshev filters with
IN3
Amplitude Response
= 7.15k, already a
R22 = R
R24 = R
R21 = R
R23 = R
FREQUENCY (Hz)
(Good Transient Response)
for f
R
R
R
R
1562 TA04 TABLE
IN2
IN4
IN1
Q1
IN3
Q3
100k
Q2
Q4
C
10kHz to 70kHz
= 3.63k
= 2.07k
= 5.58k
= 3.05k
= 3.14k
= 2.84k
Bessel
= 2.61k
= 2.96k
CHEBYSHEV
f
C
= 100kHz
1562 TA04b
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
500k
LTC1562
C
C
C
C
C
C
C
C
2
2
2
2
15
1562fa