ltc1064-7cj Linear Technology Corporation, ltc1064-7cj Datasheet

ltc1064-7cj

Manufacturer Part Number

ltc1064-7cj

Description

Linear Phase, 8th Order Lowpass Filter

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1064-7CJ.pdf (16 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

■

Steeper Roll-Off Than 8th Order Bessel Filters

Phase Equalized Filter in 14-Pin Package

Phase and Group Delay Response Fully Tested

Transient Response Exhibits 5% Overshoot and

No Ringing

Wide Dynamic Range

72dB THD or Better Throughout a 50kHz Passband

No External Components Needed

Available in 14-Pin DIP and 16-Pin SO Wide

Packages

Data Communication Filters

Time Delay Networks

Phase-Matched Filters

CUTOFF

7.5V

NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A

0.1µF 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 THE f

up to 100kHz

80kHz Linear Phase Lowpass Filter

CLK

LINE.

LTC1064-7

1064-7 TA01

–7.5V

CLK = 4MHz

7.5V

OUT

DESCRIPTIO

The LTC

lowpass filter with linear passband phase and flat group

delay. The amplitude response approximates a maximally

flat passband while it exhibits steeper roll-off than an

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

cutoff frequency the filter attains 34dB attenuation (vs

12dB for Bessel), while at three times the cutoff frequency,

the filter attains 68dB attenuation (vs 30dB for Bessel).

The cutoff frequency of the LTC1064-7 is tuned via an

external TTL or CMOS clock.

The LTC1064-7 features wide dynamic range. With single

5V supply, the S/N + THD is 76dB. Optimum 92dB S/N is

obtained with ±7.5V supplies.

The clock-to-cutoff frequency ratio of the LTC1064-7 can

be set to 50:1 (Pin 10 to V

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

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

aliasing.

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

series, LTC1164-7 and LTC1264-7.

All other trademarks are the property of their respective owners.

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

Linear Phase, 8th Order

1064-7 is a clock-tunable monolithic 8th order

RATIO = 50:1

CLK

= ±7.5V

= 4MHz

Eye Diagram

1µs/DIV

Lowpass Filter

) or 100:1 (Pin 10 to V

LTC1064-7

1064-7 TA02

–

10647fb

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