DESCRIPTION
The LTC®1560-1 is a 5th order, continuous-time, low-pass filter. The elliptic transfer function of the LTC1560-1 was carefully chosen to reach a compromise between selectivity, for antialiasing applications, and transient response. The filter cutoff frequency, fCUTOFF, is pin selectable to either 500kHz (Pin 5 to V +) or 1MHz (Pin 5 to V –). When programmed for 1MHz, the passband ripple is typically ±0.2dB up to 0.55fCUTOFF and ±0.3dB to 0.9fCUTOFF. The transition band gain is – 24dB at 1.4fCUTOFF and –51dB at 2fCUTOFF. Stopband attenuation is 63dB at 2.43fCUTOFF and above, remaining at least 60dB to 10MHz with proper board layout. When the LTC1560-1 is programmed for fCUTOFF = 500kHz, the filter response closely follows the 1MHz case with the exception of passband flatness near the cutoff frequency; the gain at fCUTOFF is –1.3dB.

FEATURES
■ 5th Order, 1MHz Elliptic Filter in SO-8 Package
■ Pin Selectable 1MHz/500kHz Cutoff Frequency
■ Signal-to-Noise Ratio (SNR): 75dB
■ Signal-to-Noise Ratio with – 63dB THD: 69dB
■ Passband Ripple (fCUTOFF = 1MHz): ±0.3dB
■ Stopband Attenuation Better Than 60dB
■ No External Components Required

APPLICATIONS
■ Antialiasing Filters
■ Smoothing or Reconstruction Filters
■ Communication Filters