LTC1562 Datasheet | Linear Technology

Very Low Noise, Low Distortion Active RC Quad Universal Filter Features DESCRIPTIO s Continuous Time- No Clock s Four 2nd Order Filter Sections, 10k Hz to 150k Hz Center Frequency s ±0.5% Typical Center Frequency Accuracy s ±0.3% Typical Center Frequency Accuracy (A Grade) s Wide Variety of Response Shapes s Lowpass, Bandpass and Highpass Responses s 103d B Typical S/N, ±5V Supply (Q = 1) s 97d B Typical S/N, Single 5V Supply (Q = 1) s 96d B Typical S/(N + THD) at ±5V Supply, 20k Hz Input s Rail-to-Rail Input and Output Voltages s DC Accurate to 3m V (Typ) s “Zero-Power” Shutdown Mode s Single or Dual Supply, 5V to 10V Total U s Resistor-Programmable f O, Q, Gain APPLICATIO S s High Resolution Systems (14 Bits to 18 Bits) s Antialiasing/Reconstruction Filters s Data munications, Equalizers s Dual or I-and-Q Channels (Two Matched 4th Order Filters in One Package) s Linear Phase Filtering s Replacing LC Filter Modules The LTC®1562 is a low noise, low distortion continuous-time filter with rail-to-rail inputs and outputs, optimized for a center frequency (f O) of 10k Hz to 150k Hz. Unlike most monolithic filters, no clock is needed. Four independent 2nd order filter blocks can be cascaded in any bination, such as one 8th order or two 4th order filters. Each block’s response is programmed with three external resistors for 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 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 94d B signal-to-noise ratio from a single 5V power supply. Low level signals can exploit the built-in gain capability of the LTC1562. Varying the gain of a section can...