Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter

The LTC1164-6 is a monolithic 8th order elliptic lowpass filter featuring clock-tunable cutoff frequency and low power supply current. Low power operation is achieved without compromising noise or distortion performance. At ±5V supplies the LTC1164-6 uses only 4mA supply current while keeping wideband noise below 110µVRMS. With a single 5V supply, the LTC1164-6 can provide up to 10kHz cutoff frequency and 80dB signal-to-noise ratio while consuming only 2.5mA.

The LTC1164-6 provides an elliptic lowpass rolloff with stopband attenuation of 64dB at 1.44 fCUTOFF and an fCLK-to- fCUTOFF ratio of 100:1 (Pin10 to V– ). For a ratio of 100:1, fCUTOFF can be clock-tuned up to 10kHz. For a fCLK-to-fCUTOFF ratio of 50:1 (Pin 10 to V+ ), the LTC1164-6 provides an elliptic lowpass filter with fCUTOFF frequencies up to 20kHz. When Pin 10 is connected to ground, the LTC1164-6 approximates an 8th order linear phase response with 65dB attenuation at 4.5 f–3dB and fCLK/f–3dB ratio of 160:1. The LTC1164-6 is pin compatible with the LTC1064-1.

Applications

* Antialiasing Filters

* Battery-Operated Instruments

* Telecommunication Filters

* 8th Order Pin Selectable Elliptic or Bessel Filter

* 4mA Supply Current with ±5V Supplies

* 64dB Attenuation at 1.44 fCUTOFF (Elliptic Response)

* fCUTOFF Up to 30kHz (50:1 fCLK to fCUTOFF Ratio)

* 110µVRMS Wideband Noise with ±5V Supplies

* Operates at Single 5V Supply with 1VRMS Input Range

* Operates Up to ±8V Supplies

* TTL/CMOS Compatible Clock Input

* No External Components

* Available in 14-Pin Dip and 16-Pin SO Wide Packages