1

LTC1564

1564fa

10kHz to 150kHz

Digitally Controlled

Antialiasing Filter and 4-Bit P.G.A.

Steps

– 100dB Attenuation at 2.5

Amplifier

– G = 1 to 16 in 1V/V Steps

■

DSP Systems

■

High Resolutions (16 Bits to 20 Bits)

■

Programmable Data Rates

Low Noise Programmable Filter with Variable Gain

The LTC

antialiasing, reconstruction and other band-limiting appli-

cations. No other analog components or filter expertise are

needed to use it. There is one analog input pin and one

programmable while the shape of the lowpass response is

or it can be bypassed for control directly from the pins. The

LTC1564 operates from 2.7V to 10V total (single or split

supplies) and comes in a 16-pin surface mount SSOP.

The LTC1564 is a rail-to-rail high resolution 8th-order

lowpass filter with two stopband notches, giving approxi-

mately 100dB attenuation at 2.5 times the passband cutoff

Signals with low or variable levels can be normalized with

the built-in variable gain that reduces input-referred noise

with increasing gain for a typical dynamic range (maxi-

mum signal level to minimum noise) of 122dB (20 equiva-

supply.

Other frequency-response shapes can be provided upon

request. Please contact LTC Marketing.

LTC1564

G2

G1

G0

123

4

5

6

7

1564 TA01

8

16

15

14

13

12

11

GAIN CODE

FREQUENCY CODE

1.35V TO 5.25V EACH

SET FREQUENCY AND GAIN

DYNAMIC RANGE 118dB TO 122dB

AT

±5V DEPENDING ON FREQUENCY CODE

0.1

µF

10

9

EN

CS/

HOLD F3

F2

F1

F0

0.1

µF

ANALOG

OUT

ANALOG

IN

LTC1564 Programmable Range

FREQUENCY (kHz)

5

10

100

500

1564 TA02

10

30

20

0

–10

–20

–30

–40

–50

–60

–70

–80

–120

–110

–100

–90

GAIN = 1V/V

GAIN = 16V/V

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.