LTC1164-5M(RevA) 查看數據表（PDF） - Linear Technology

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LTC1164-5M
(Rev.:RevA)

Low Power 8th Order Pin Selectable Butterworth or Bessel Lowpass Filter

Linear Technology 

FEATURES

s Pin Selectable Butterworth or Bessel Response

s 4mA Supply Current with ±5V Supplies

s fCUTOFF up to 20kHz

s 100µVRMS Wideband Noise

s THD < 0.02% (50:1, VS = ±7.5V, VIN = 2VRMS)

s Operates with a Single 5V Supply (1VRMS Input

Range)

s 60µVRMS Clock Feedthrough (Single 5V Supply)

s Operates up to ±8V Supplies

s TTL/CMOS-Compatible Clock Input

s No External Components

U

APPLICATIO S

s Anti-Aliasing Filters

s Battery-Operated Instruments

s Telecommunications Filters

s Smoothing Filters

LTC1164-5

Low Power 8th Order

Pin Selectable Butterworth

or Bessel Lowpass Filter

DESCRIPTIO

The LTC®1164-5 is a monolithic 8th order filter; it approxi-

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 –) or 50:1 double-sampled (Pin 10 to V + and

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.

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

TYPICAL APPLICATIO

Butterworth 20kHz Anti-Aliasing Filter

1

14

VIN

2

13

3

12

–8V

WIDEBAND NOISE = 110µVRMS

8V

4 LTC1164-5 11

5

10

CLK = 1MHz THD IN PASSBAND < 0.02% AT VIN = 2VRMS

NOTE: THE CONNECTION FROM PIN 7 TO PIN 14

TO V+

SHOULD BE MADE UNDER THE PACKAGE.

NC

6

7

9

VOUT

FOR 50:1 OPERATION CONNECT PIN 1 TO PIN 13

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

8

AND 13 SHOULD FLOAT. THE POWER SUPPLIES

SHOULD BE BYPASSED BY A 0.1µF CAPACITOR AS

1164-5 TA01

CLOSE TO THE PACKAGE AS POSSIBLE.

0

–10

– 20

– 30

– 40

– 50

– 60

– 70

– 80

1

Frequency Response

10

FREQUENCY (kHz)

100

LTC1164-5 TA02

1

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