1

LTC1164-6

11646fa

Low Power 8th Order

Pin Selectable Elliptic or

Linear Phase Lowpass Filter

■ 8th Order Pin Selectable Elliptic or Bessel Filter

■ 4mA Supply Current with

±5V Supplies

■ 64dB Attenuation at 1.44 fCUTOFF (Elliptic Response)

■ fCUTOFF Up to 30kHz (50:1 fCLK to fCUTOFF Ratio)

■ 110

µVRMS Wideband Noise with ±5V Supplies

■ Operates at Single 5V Supply with 1VRMS

Input Range

■ Operates Up to

±8V Supplies

■ TTL/CMOS Compatible Clock Input

■ No External Components

■ Available in 14-Pin Dip and 16-Pin SO Wide Packages

■ Antialiasing Filters

■

Battery-Operated Instruments

■ Telecommunication Filters

The LTC

®1164-6 is a monolithic 8th order elliptic lowpass

filter featuring clock-tunable cutoff frequency and low

power supply current. Low power operation is achieved

without compromising noise or distortion performance.

At

±5V supplies the LTC1164-6 uses only 4mA supply

current while keeping wideband noise below 110

µVRMS.

With a single 5V supply, the LTC1164-6 can provide up to

10kHz cutoff frequency and 80dB signal-to-noise ratio

while consuming only 2.5mA.

The LTC1164-6 provides an elliptic lowpass rolloff with

stopband attenuation of 64dB at 1.44 fCUTOFF and an fCLK-

to-fCUTOFF ratio of 100:1 (Pin 10 to V –). For a ratio of 100:1,

fCUTOFF can be clock-tuned up to 10kHz. For a fCLK-to-

fCUTOFF ratio of 50:1 (Pin 10 to V +), the LTC1164-6

provides an elliptic lowpass filter with fCUTOFF frequencies

up to 20kHz. When Pin 10 is connected to ground, the

LTC1164-6 approximates an 8th order linear phase re-

sponse with 65dB attenuation at 4.5 f –3dB and fCLK/f –3dB

ratio of 160:1. The LTC1164-6 is pin compatible with the

LTC1064-1.

10kHz Anti-Aliasing Elliptic Filter

Frequency Response

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-6

VIN

8V

–8V

CLK = 1MHz

VOUT

WIDEBAND NOISE = 115

µVRMS

NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE

UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED

BY A 0.1

µF CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.

1164-6 TA01

NC

NC

–8V

FREQUENCY (kHz)

1

0

–10

–20

–30

–40

–50

–60

–70

–80

10

100

1164-6 TA02