LTC1164-5

1

11645fc

Low Power 8th Order

Pin Selectable Butterworth

or Bessel Lowpass Filter

Butterworth 20kHz Anti-Aliasing Filter

■

Pin Selectable Butterworth or Bessel Response

±5V Supplies

■

100

Range)

±8V Supplies

■

TTL/CMOS-Compatible Clock Input

Packages

The LTC

mates either a Butterworth or a Bessel lowpass response.

The LTC1164-5 features clock-tunable cutoff frequency

and low power consumption (4.5mA with

±5V supplies

and 2.5mA with single 5V supply).

Low power operation is achieved without compromising

noise or distortion performance. With

±5V supplies and

10kHz cutoff frequency, the operating signal-to-noise

ratio is 86dB and the THD throughout the passband is

0.015%. Under the same conditions, a 77dB signal-to-

noise ratio and distortion is obtained with a single 5V

supply while the clock feedthrough is kept below the noise

level. The maximum signal-to-noise ratio is 92dB.

The LTC1164-5 approximates an 8th order Butterworth

response with a clock-to-cutoff frequency ratio of 100:1

(Pin 10 to V

Pin 1 shorted to Pin 13). Double-sampling allows the input

signal frequency to reach the clock frequency before any

aliasing occurrence. An 8th order Bessel response can

also be approximated with a clock-to-cutoff frequency

ratio of 140:1 (Pin 10 to ground). With

±7.5V supply, ±5V

supply and single 5V supply, the maximum clock fre-

quency of the LTC1164-5 is 1.5MHz, 1MHz and 1MHz

respectively. The LTC1164-5 is pin-compatible with the

LTC1064-2 and LTC-1064-3.

Frequency Response

■

Battery-Operated Instruments

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

FREQUENCY (kHz)

1

0

–10

–20

–30

–40

–50

–60

–70

–80

10

100

1164-5 TA02

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-5

8V

NC

–8V

CLK = 1MHz

WIDEBAND NOISE = 110

NOTE: THE CONNECTION FROM PIN 7 TO PIN 14

SHOULD BE MADE UNDER THE PACKAGE.

FOR 50:1 OPERATION CONNECT PIN 1 TO PIN 13

AS SHOWN. FOR 100:1 OR 150:1 OPERATION PINS 1

AND 13 SHOULD FLOAT. THE POWER SUPPLIES

SHOULD BE BYPASSED BY A 0.1

µF CAPACITOR AS

CLOSE TO THE PACKAGE AS POSSIBLE.

1164-5 TA01