LINEAR Technology LTC1562-2 Data Sheet

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LTC1562-2

Very Low Noise, Low Distortion Active RC Quad Universal Filter

FEATURES DESCRIPTIO Continuous Time—No Clock The LTC®1562-2 is a low noise, low distortion continuous Four 2nd Order Filter Sections, 20k Hz to 300k Hz time filter with rail-to-rail inputs and outputs, optimized for a Center Frequency center frequency (f O) of 20k Hz to 300k Hz. Unlike most Butterworth, Chebyshev, Elliptic or Equiripple monolithic filters, no clock is needed. Four independent 2nd Delay Response order filter blocks can be cascaded in any combination, such Lowpass, Bandpass, Highpass Responses as one 8th order or two 4th order filters. Each block’s 99d B Typical S/N, ±5V Supply (Q = 1) response is programmed with three external resistors for 93d B Typical S/N, Single 5V Supply (Q = 1) center frequency, Q and gain, using simple design formulas. Rail-to-Rail Input and Output Voltages Each 2nd order block provides lowpass and bandpass out- DC Accurate to 3m V (Typ) puts. Highpass response is available if an external capacitor ±0.5% Typical Center Frequency Accuracy replaces one of the resistors. Allpass, notch and elliptic “Zero-Power” Shutdown Mode responses can also be realized. Single or Dual Supply, 5V to 10V Total

The LTC1562-2 is designed for applications where dynamic

Resistor-Programmable f O, Q, Gain

range is important. For example, by cascading 2nd order sections in pairs, the user can configure the IC as a dual 4th

APPLICATIO S

GA IN (d B) order Butterworth lowpass filter with 90d B signal-to-noise

ratio from a single 5V power supply. Low level signals can

High Resolution Systems (14 Bits to 18 Bits)

exploit the built-in gain capability of the LTC1562-2. Varying

Antialiasing/Reconstruction Filters

the gain of a section can achieve a dynamic range as high as

Data Communications, Equalizers

114d B with a ±5V supply.

Dual or I-and-Q Channels (Two Matched 4th Order Filters in One Package) Other cutoff frequency ranges can be provided upon request. Linear Phase Filtering Please contact LTC Marketing. Replacing LC Filter Modules , LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Amplitude Response

Dual 4th Order 200k Hz Butterworth Lowpass Filter, SNR 96d B

RIN2 7.87k

VOUT1

RIN1 7.87k

INV B –10

VIN1 INV C

RQ1 4.22k RQ2 10.2k

5V V+ LTC1562-2 V– –5V*

SHDN AGND

RQ3 4.22k RQ4 10.2k

RIN3 7.87k

VIN2 INV A INV D

VOUT2

RIN4 7.87k FREQUENCY (Hz)

*V– ALSO AT PINS 4, 7, 14 & 17

1562-2 TA01

ALL RESISTORS 1% METAL FILM 1562-2 TA02