LTC1560-1 - 1MHz/500kHz Continuous Time Low Noise, Lowpass Elliptic Filter

LTC1560-1 - 1MHz/500kHz Continuous Time Low Noise, Lowpass Elliptic Filter - Linear Technology（凌力尔特）

The LTC?1560-1 is a 5th order, continuous-time, lowpassfilter. The elliptic transfer function of the LTC1560-1 wascarefully chosen to reach a compromise between selectivity,for antialiasing applications, and transient response.The filter cutoff frequency, fCUTOFF, is pin selectable toeither 500kHz (Pin 5 to V+) or 1MHz (Pin 5 to V?). Whenprogrammed for 1MHz, the passband ripple is typically?0.2dB up to 0.55fCUTOFF and ?0.3dB to 0.9fCUTOFF. Thetransition band gain is ?24dB at 1.4fCUTOFF and ?51dB at2fCUTOFF. Stopband attenuation is 63dB at 2.43fCUTOFF andabove, remaining at least 60dB to 10MHz with properboard layout. When the LTC1560-1 is programmed forfCUTOFF = 500kHz, the filter response closely follows the1MHz case with the exception of passband flatness nearthe cutoff frequency; the gain at fCUTOFF is ?1.3dB.

The LTC1560-1, unlike other high frequency filters, isdesigned for low noise and low distortion. With a 1VRMSinput signal, the signal-to-noise ratio is 69dB and the THDis ?63dB. The maximum SNR of 75dB is obtained with a2.1VRMS input signal. This results in ?46dB THD.

The LTC1560-1 operates with ±5V supplies, has a powersaving mode and is available in an SO-8 surface mountpackage.

Other cutoff frequencies from 450kHz to 1.5MHz can beobtained. Demo board DC135A is available for theLTC1560-1. For more information please contact LTCMarketing.