Features

• 8th Order Pin Selectable Elliptic or Bessel Filter
• 4mA Supply Current with ±5V Supplies
• 64dB Attenuation at 1.44 f_CUTOFF (Elliptic Response)
• f_CUTOFF Up to 30kHz (50:1 f_CLK to f_CUTOFF Ratio)
• 110µV_RMS Wideband Noise with ±5V Supplies
• Operates at Single 5V Supply with 1V_RMS 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

Typical Application

Description

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 110µV_RMS. 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 f _CUTOFF and an fCLK-to- f_CUTOFF ratio of 100:1 (Pin10 to V - ).For a ratio of 100:1, f_CUTOFF can be clock-tuned up to 10kHz. For a fCLK-to-f_CUTOFF ratio of 50:1 (Pin 10 to V + ), the LTC1164-6 provides an elliptic lowpass filter with f_CUTOFF frequencies up to 20kHz. When Pin 10 is connected to ground, the LTC1164-6 approximates an 8th order linear phase re-sponse 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.