LTC1064-4CSW#PBF

LTC1064-4 is an 8th order, clock sweepable cauer lowpass switched capacitor filter. An external TTL or CMOS clock programs the value of the filter’s cut-off frequency. With pin 10 at V+, the fCLK to fCUTOFF ratio is 50:1; the filter has a cauer response and with compensation the passband ripple is ±0.1dB. The stopband attenuation is 80dB at 2 × fCUTOFF. Cut off frequencies upto 100KHz can be achieved. With pin 10 at V–, the fCLK to f–3dB ratio is 100:1, the filter has a transitional butterworth cauer response with lower noise and lower delay nonlinearity than the cauer response. The stopband attenuation at 2.5 × f–3dB is 92dB. Cut-off frequencies upto 50KHz can be achieved. It features low noise and low harmonic distortion even when input voltages up to 3VRMS are applied. This device overall performance competes with equivalent multiple op amp active realizations. It is used in applications such as antialiasing filters, telecom filters, sinewave generators etc.

• Total wideband noise is 135µVRMS typical at (VS = ±7.5V, input = GND 1Hz to 999KHz)
• Total harmonic distortion is 0.03% typical at (VS = ±7.5V, Input = 3VRMS at 1KHz)
• Power supply voltage range is ±2.37V to ±8V
• Input frequency range upto 50 times the filter cut-off frequency
• Power supply current is 11mA typical at (VS = ±2.37V, fCLK = 1MHz)
• Clock frequency is 5MHz maximum at (TA = 25°C, VS = ±7.5V)
• Gain tempCo is 0.0002dB/°C typical at (TA = 25°C, VS = ±7.5V)
• Operating temperature is –40°C to 85°C
• Package style is 16-lead plastic WSOIC

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