The LTC1562-2 is a low noise, low distortion continuous time filter with rail-to-rail inputs and outputs, optimized for a center frequency (fO) of 20kHz to 300kHz. It does not require a clock signal. The filter consists of four independent 2nd order filter blocks that can be cascaded in any combination, such as one 8th order or two 4th order filters. The response of each block can be programmed with three external resistors to set the center frequency, Q, and gain using simple design formulas. Each 2nd order block provides lowpass and bandpass outputs. Highpass response is available if an external capacitor replaces one of the resistors. Allpass, notch, and elliptic responses can also be realized. The LTC1562-2 is designed for applications where dynamic range is important. For example, by cascading 2nd order sections in pairs, the user can configure the IC as a dual 4th order Butterworth lowpass filter with a 90dB signal-to-noise ratio from a single 5V power supply. Low level signals can exploit the built-in gain capability of the LTC1562-2. Varying the gain of a section can achieve a dynamic range as high as 114dB with a ±5V supply. Other cutoff frequency ranges can be provided upon request. Please contact LTC Marketing. LTC, LT are registered trademarks of Linear Technology Corporation.
The LTC1562-2 is a very low noise, low distortion active RC quad universal filter designed for high resolution systems. It features four independent 2nd order filter sections that operate continuously without requiring an external clock signal. The device supports center frequencies ranging from 20kHz to 300kHz and allows users to configure Butterworth, Chebyshev, Elliptic, or Equiripple delay responses.
| Center Frequency Range | 20kHz to 300kHz |
|---|---|
| Supply Voltage (Dual) | 5V to 10V Total |
| Shutdown Supply Current | 15 pA (to V+) |
| Output Voltage Swing (+5V) | 93 dB Typical S/N |
No, it is a continuous time filter that does not need an external clock.
The device supports Butterworth, Chebyshev, Elliptic, or Equiripple delay responses.