Datasheet

12
LTC1562-2
15622fa
TYPICAL APPLICATIONS
U
R
IN2
20.5k
R
Q2
26.7k
R22 10k
R24 4.02k
R
Q4
3.24k
R
IN4
40.2k
R
Q3
59k
R23 11.3k
R
Q1
9.09k
R21 7.15k
V
IN
5V
0.1µF
0.1µF
–5V*
V
OUT
*V
–
ALSO AT PINS 4, 7, 14 & 17
ALL RESISTORS 1% METAL FILM
ALL CAPACITORS 5% STANDARD VALUES
C
IN1
220pF
C
IN2
82pF
C
IN3
47pF
R
IN3
45.3k
C
IN4
100pF
1562-2 TA03a
20
19
18
16
15
13
12
11
1
2
3
5
6
8
9
10
INV C
V1 C
V2 C
V
–
AGND
V2 D
V1 D
INV D
INV B
V1 B
V2 B
V
+
SHDN
V2 A
V1 A
INV A
LTC1562-2
175kHz 8th Order Elliptic Highpass Filter
GAIN (dB)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
50k 900k
FREQUENCY (Hz)
200k
1562-2 TA03b
Amplitude Response
This procedure can be iterated, adjusting the value of R
T
,
to find convenient values for C
INA
and C
INB
since resistor
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
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 data
sheet under the heading “Notches and Elliptic Responses.”
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 7958Ω
and C is 100pF.