LTC1064-7

The LTC1064-7 is a clock-tunable monolithic 8th order 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⁺) or 100:1 (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.

Applications

• Data Communication Filters
• Time Delay Networks
• Phase-Matched Filters