LTC1562-2 Linear Technology, LTC1562-2 Datasheet - Page 12

• Manufacturer Part Number: LTC1562-2
• Description: Very Low Noise/ Low Distortion Active RC Quad Universal Filter
• Manufacturer: Linear Technology

LTC1562-2
This procedure can be iterated, adjusting the value of R
to find convenient values for C
values are generally available in finer increments than
capacitor values.
LTC1562/LTC1562-2 Demo Board
The LTC demonstration board DC266 is assembled with
an LTC1562 or LTC1562-2 in a 20-pin SSOP package and
power supply decoupling capacitors. Jumpers on the
board configure the filter chip for dual or single supply
operation and power shutdown. Pads for surface mount
TYPICAL APPLICATIONS
12
V
5V
IN
C
IN1
220pF
*V
ALL RESISTORS 1% METAL FILM
ALL CAPACITORS 5% STANDARD VALUES
0.1 F
R21 7.15k
R23 11.3k
R
R
–
Q1
Q3
ALSO AT PINS 4, 7, 14 & 17
175kHz 8th Order Elliptic Highpass Filter
9.09k
59k
10
1
2
3
5
6
8
9
INV B
V1 B
V2 B
V
SHDN
V2 A
V1 A
INV A
+
LTC1562-2
INA
R
R
IN2
IN4
and C
U
20.5k
40.2k
AGND
INV D
INV C
V1 C
V2 C
V2 D
V1 D
C
V
IN2
INB
–
C
82pF
20
19
18
16
15
13
12
11
IN4
since resistor
100pF
R24 4.02k
R
Q4
R
3.24k
R22 10k
Q2
26.7k
T
,
C
R
IN3
IN3
0.1 F
resistors and capacitors are provided to build application-
specific filters. Also provided are terminals for inputs,
outputs and power supplies.
Notches and Elliptic Responses
Further circuit techniques appear in the LTC1562 final
data sheet under the heading “Notches and Elliptic Re-
sponses.” These techniques are directly applicable to the
LTC1562-2 with the substitution of the different values for
the internal components R1 and C. In the LTC1562-2, R1
is 7958 and C is 100pF.
47pF
45.3k
1562-2 TA03a
– 5V*
V
OUT
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
0
50k
Amplitude Response
FREQUENCY (Hz)
200k
1562-2 TA03b
900k