LTC1164

1

1164fa

■

Low Power

■

4 Filters in a 0.3" Wide Package

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1/2 the Noise of the LTC1059, 60, 61 Devices

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Wide Output Swing

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Clock-to-Center Frequency Ratios of 50:1 and 100:1

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Operates from ±2.37V to ±8V Power Supplies

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Customized Version with Internal Resistors Available

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Ratio of 50:1 and 100:1 Simultaneously Available

The LTC

®1164 consists of four low power, low noise

2nd order switched capacitor filter building blocks. Each

building block typically consumes 850µA supply current.

Low power is achieved without sacrificing noise and

distortion. Each building block, together with 3 to 5

resistors, can provide 2nd order functions like lowpass,

highpass, bandpass, and notch. The center frequency of

each 2nd order section can be tuned with an external clock,

or a clock and resistor ratio. For Q < 5, the center frequency

range is from 0.1Hz to 20kHz. Up to 8th order filters can

be realized by cascading all four 2nd order sections. Any

classical filter realization (such as Butterworth, Cauer,

Bessel, and Chebyshev) can be formed.

A customized monolithic version of the LTC1164

including internal thin film resistors can be obtained.

Consult LTC Marketing for details.

The LTC1164 is manufactured using Linear Technology’s

enhanced LTCMOS™ silicon gate process.

Low Power, Low Noise, Quad

Universal Filter Building Block

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Antialiasing Filters

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Telecom Filters

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Spectral Analysis

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Loop Filters

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For Fixed Lowpass Filter Requirements use the

LTC1164-XX Series

Dual 5th Order Linear Phase Filter with Stopband Notch

Dual 5th Order Linear Phase Filter with

Stopband Notch, fCLK = 500kHz

FREQUENCY (Hz)

1k

10k

100k

LTC1164 • TA02

VOUT2

VOUT1

–90.00

–70.00

–40.00

10.00

–10.00

–80.00

–60.00

–50.00

–30.00

0.0

–20.00

SUPPLY

TOTAL

VOLTAGE

VIN

HARMONIC DISTORTION

SIGNAL/NOISE

±2.5

1VRMS

0.015% (– 76dB)

86dB

±5.0

2VRMS

0.025% (– 72dB)

92dB

±7.5

4VRMS

0.04% (– 68dB)

98dB

LTC1164 • TA01

0.1µF

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

549k

63.4k

49.9k

78.7k

8.66k

C1

C2

36.5k

36.5k

49.9k

63.4k

549k

78.7k

8.66k

133k

102k

VIN1

VIN2

VOUT1

VOUT2

fCLK

174k

102k

174k

133k

210k

C1 = 0.0033µF

C2 = 0.0068µF

fCLK = 500kHz

WIDEBAND NOISE = 50µVRMS

TOTAL SUPPLY CURRENT = 3mA

ALL RESISTORS ARE 1% METAL FILM

210k

V+

V–

0.1µF

LTC1164

FEATURES

DESCRIPTIO

APPLICATIO S

LTCMOS trademark of Linear Technology Corporation.

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

TYPICAL APPLICATIO