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

The LTC™1560-1 is a 5th order, continuous-time, lowpass 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.

The LTC1560-1, unlike other high frequency filters, is designed for low noise and low distortion. With a 1VRMS input signal, the signal-to-noise ratio is 69dB and the THD is �63dB. The maximum SNR of 75dB is obtained with a 2.1VRMS input signal. This results in �46dB THD.

The LTC1560-1 operates with ±5V supplies, has a power saving mode and is available in an SO-8 surface mount package.

Other cutoff frequencies from 450kHz to 1.5MHz can be obtained. Demo board DC135A is available for the LTC1560-1. For more information please contact LTC Marketing.

特点 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 典型应用

应用 Antialiasing Filters Smoothing or Reconstruction Filters Communication Filters 封装信息

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