LTC1164-7| Datasheet

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LTC1164-7 Low Power, Linear Phase 8th Order Lowpass Filter

FEATURES

DESCRIPTIO

Better Than Bessel Roll-Off fCUTOFF up to 20kHz, Single 5V Supply ISUPPLY = 2.5mA (Typ), Single 5V Supply 75dB THD + Noise with Single 5V Supply Phase and Group Delay Response Fully Tested Transient Response with No Ringing Wide Dynamic Range No External Components Needed Available in 14-Lead N and 16-Lead SW Packages

The LTC1164-7 is a low power, clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. The amplitude response approximates a maximally flat passband and exhibits steeper roll-off than an equivalent 8th order Bessel filter. For instance, at twice the cutoff frequency the filter attains 34dB attenuation (vs12dB for Bessel), while at three times the cutoff frequency the filter attains 68dB attenuation (vs 30dB for Bessel). The cutoff frequency of the LTC1164-7 is tuned via an external TTL or CMOS clock. Low power is achieved without sacrificing dynamic range. With single 5V supply, the S/N + THD is up to 75dB. Optimum 91dB S/N is obtained with 7.5V supplies. The clock-to-cutoff frequency ratio of the LTC1164-7 can be set to 50:1 (Pin 10 to V +) or 100:1 (Pin 10 to V ). When the filter operates at the clock-to-cutoff frequency ratio of 50:1, the input is double-sampled to lower the risk of aliasing. The LTC1164-7 is pin-compatible with the LTC1064-X series and LTC1264-
7.

APPLICATIO S

Data Communication Filters Time Delay Networks Phase Matched Filters

, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO
1 VIN 2 3 5V 4 5 6 7 LTC1164-7 14 13 12 11 10 9 8

10kHz Linear Phase Lowpass Filter
0

5V CLK = 500kHz 5V VOUT

10 20 DELAY

GAIN (dB)

30 40 50 60

NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1uF 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 fCLK LINE. 1164-7 TA01

70 80 1 10 FREQUENCY (kHz)

U
Frequency Response
GAIN 150 140 130 120 110 100 90 80 70 100
1164-7 TA02

DELAY (us)
11647fb