1

LTC1164-7

11647fb

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

Low Power, Linear Phase

8th Order Lowpass Filter

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Transient Response with No Ringing

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Available in 14-Lead N and 16-Lead SW Packages

The LTC1164-7 is a low power, clock-tunable monolithic

8th order lowpass filter with linear passband phase and

flat group delay. The amplitude response approximates a

maximally flat passband and exhibits steeper roll-off than

an equivalent 8th order Bessel filter. For instance, at twice

the cutoff frequency the filter attains 34dB attenuation

(vs12dB for Bessel), while at three times the cutoff fre-

quency the filter attains 68dB attenuation (vs 30dB for

Bessel). The cutoff frequency of the LTC1164-7 is tuned

via an external TTL or CMOS clock.

Low power is achieved without sacrificing dynamic range.

With single 5V supply, the S/N + THD is up to 75dB.

Optimum 91dB S/N is obtained with

±7.5V supplies.

The clock-to-cutoff frequency ratio of the LTC1164-7 can

When the filter operates at the clock-to-cutoff frequency

ratio of 50:1, the input is double-sampled to lower the risk

of aliasing.

The LTC1164-7 is pin-compatible with the LTC1064-X

series and LTC1264-7.

10kHz Linear Phase Lowpass Filter

Frequency Response

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LTC1164-7

5V

–5V

CLK = 500kHz

5V

1164-7 TA01

NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED

BY A 0.1

µF CAPACITOR CLOSE TO THE PACKAGE

AND ANY PRINTED CIRCUIT BOARD ASSEMBLY

SHOULD MAINTAIN A DISTANCE OF AT LEAST 0.2

INCHES BETWEEN ANY OUTPUT OR INPUT PIN AND

FREQUENCY (kHz)

1

0

–10

–20

–30

–40

–50

–60

–70

–80

10

100

1164-7 TA02

150

140

130

120

110

100

90

80

70

DELAY

GAIN

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

All other trademarks are the property of their respective owners.