LTC1064-4

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FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

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Antialiasing Filters

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Telecom Filters

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Sinewave Generators

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8th Order Filter in a 14-Pin Package

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0.03% THD or Better

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Operates up to ±8V Power Supplies

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Input Frequency Range up to 50 Times the Filter

Cutoff Frequency

Low Noise, 8th Order, Clock

Sweepable Cauer Lowpass Filter

The LTC

lowpass switched capacitor filter. An external TTL or

CMOS clock programs the value of the filter’s cutoff

50:1; the filter has a Cauer response and with compensa-

tion the passband ripple is ±0.1dB. The stopband attenu-

Cauer response with lower noise and lower delay

nonlinearity than the Cauer response. The stopband

50kHz can be achieved.

The LTC1064-4 features low noise and low harmonic

applied. The LTC1064-4 overall performance competes

with equivalent multiple op amp active realizations. The

LTC1064-4 is pin compatible with the LTC1064-1,

LTC1064-2 and LTC1064-3.

The LTC1064-4 is manufactured using Linear Technology’s

enhanced LTCMOS

8th Order Clock Sweepable Lowpass Elliptic Filter

Frequency Response

FREQUENCY (Hz)

1k

20

0

–20

–40

–60

–80

–100

10k

100k

1M

1064-4 TA01b

* FOR FREQUENCIES ABOVE 20kHz AND MINIMUM PASSBAND RIPPLE REFER

TO THE PIN DESCRIPTION SECTION FOR COMPENSATION GUIDELINES.

LTC1064-4

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2

3

4

5

6

7

14

13

12

11

10

9

8

R(h, I)

COMP2*

50/100

NC

INV C

AGND

AGND

COMP1*

INV A

1064 TA01

CLOCK

(TTL, ≤5MHz)

–8V

8V

0.1µF

0.1µF

NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR

CLOSE TO THE PACKAGE. BYPASSING PIN 10 WITH 0.1µF CAPACITOR

REDUCES CLOCK FEEDTHROUGH. THE CONNECTION BETWEEN PINS 7

AND 14 SHOULD BE PHYSICALLY DONE UNDER THE PACKAGE.

LTCMOS is a trademark of Linear Technology Corporation.

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