LTC1562 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1562' PDF : 28 Pages View PDF
TYPICAL APPLICATIONS (Basic)
8th Order Bandpass Filter, Single 5V Supply,
Center Frequency
– 1dB Bandwidth =
10
RIN1
VIN
5V
0.1µF
RIN2
1
INV B
20
INV C
RQ1
2
V1 B
19
V1 C
R21
3
V2 B
18
V2 C
5 V+ LTC1562 V– 16
6
SHDN
15
AGND
R23
8
V2 A
13
V2 D
9
V1 A
12
V1 D
RQ3
10
11
INV A
INV D
RIN4
RQ2
R22
1µF
R24
RQ4
VOUT
RIN3
1562 TA06a
SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE.
PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V –
LTC1562
Amplitude Response
10
fCENTER = 100kHz
0
– 10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
60 68 76 84 92 100 108 116 124 132 140
FREQUENCY (kHz)
1562 TA06b
Quick Design Formulas for a Center Frequency fC (Recommended Range 50kHz to 120kHz):
R21
=
R23
=
11.7k
100kHz
ƒC
2
R22 =
R24 =
8.66k
100kHz
ƒC
2
RIN1
=
RIN3
=
ƒC + 1736kHz
100kHz
R21
2.56
RIN2 = RIN4 =
ƒC + 634kHz
100kHz
RQ2
14.36
RQ1
=
RQ3
=
215.5k
100kHz
ƒC
100kHz
ƒC + 229kHz
RQ2
=
RQ4
=
286.2k
100kHz
ƒC
100kHz
ƒC + 351kHz
Notes: R21 and RQ2 should be rounded to the nearest standard finite-tolerance value before using these values in
the later formulas. For fC < 100kHz, the maximum peak-to-peak passband input level is (fC/100kHz)5V. Use
LTC1562A for minimum variation of passband gain.
Example: Center frequency fC of 100kHz. The formulas give R21 = R23 = 11.7k, nearest standard 1% value 11.5k.
This value gives RIN1 = RIN3 = 82.46k, nearest 1% value 82.5k. RQ1 = RQ3 = 65.5k, nearest 1% value 64.9k.
R22 = R24 = 8.66k, already a standard 1% value. This gives RIN2 = RIN4 = 32.4k (again already a standard 1% value).
RQ2 = RQ4 = 63.45k, nearest 1% value 63.4k. If LTC1562A is used, resistor tolerances tighter than 1% will further
improve the passband gain accuracy.
1562 TA06 TABLE
17
Share Link: 
