LTC1562IG-2 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1562IG-2

Very Low Noise, Low Distortion Active RC Quad Universal Filter

Linear Technology 

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LTC1562-2

This procedure can be iterated, adjusting the value of RT,

to find convenient values for CINA and CINB 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 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 7958Ω and C is 100pF.

TYPICAL APPLICATIONS

175kHz 8th Order Elliptic Highpass Filter

CIN2 82pF

RIN2 20.5k

CIN3 47pF

CIN1 220pF

VIN

RQ1 9.09k

R21 7.15k

5V

0.1µF

R23 11.3k

RQ3 59k

1

INV B

20

INV C

2

V1 B

19

V1 C

3

V2 B

18

V2 C

5 V+ LTC1562-2 V– 16

6

SHDN

15

AGND

8

V2 A

13

V2 D

9

V1 A

12

V1 D

10

INV A

11

INV D

RQ2 26.7k

R22 10k

R24 4.02k

RQ4 3.24k

RIN4 40.2k

CIN4 100pF

RIN3 45.3k

0.1µF

– 5V*

VOUT

*V – ALSO AT PINS 4, 7, 14 & 17

ALL RESISTORS 1% METAL FILM

ALL CAPACITORS 5% STANDARD VALUES

1562-2 TA03a

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

50k

Amplitude Response

200k

FREQUENCY (Hz)

900k

1562-2 TA03b

12

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