LTC1064-2

1

10642fa

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

■

Antialiasing Filters

■

Smoothing Filters

■

Tracking High Frequency Lowpass Filters

■

8th Order Filter in a 14-Pin Package

■

140kHz Maximum Corner Frequency

■

No External Components

■

50:1 and 100:1 Clock to Cutoff Frequency Ratio

■

■

0.03% THD or Better

■

Operates from ±2.37V to ±8V Power Supplies

Low Noise, High Frequency,

8th Order Butterworth Lowpass Filter

The LTC

Butterworth filter, which provides a maximally flat pass-

band. The attenuation slope is –48dB/octave and the

maximum attenuation is in excess of 80db. An external

TTL or CMOS clock programs the filter’s cutoff frequency.

The clock to cutoff frequency ratio is 100:1 (Pin 10 at

is 140kHz. No external components are needed.

The LTC1064-2 features low wideband noise and low

In fact the LTC1064-2 overall performance competes with

equivalent multiple op amp RC active realizations. The

LTC1064-2 is available in a 14-pin DIP or 16-pin surface

mounted SW package. The LTC1064-2 is fabricated using

LTC’s enhanced analog CMOS Si-gate process.

The LTC1064-2 is pin compatible with the LTC1064-1.

8th Order Clock Sweepable

Lowpass Butterworth Filter

Measured Frequency Response

FREQUENCY (kHz)

0

0

–15

–30

–45

–60

–75

–90

–105

300

500

1064-2 TA01b

100

200

400

600

700

LTC1064-2

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUT C

NC

50/100

NC

NC

AGND

AGND

NC

1064 TA01a

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

CAPACITOR CLOSE TO THE PACKAGE. THE NC PINS 1, 6, 8,

AND 13 SHOULD BE PREFERABLY GROUNDED.

8V

–8V

CLOCK = 5MHz

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