LINEAR LTC1562 Data Sheet

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LTC1562

Very Low Noise, Low Distortion Active RC Quad Universal Filter

FEATURES DESCRIPTION

Continuous Time—No Clock The LTC®1562 is a low noise, low distortion continuous-time Four 2nd Order Filter Sections, 10k Hz to 150k Hz filter with rail-to-rail inputs and outputs, optimized for a Center Frequency center frequency (f O) of 10k Hz to 150k Hz. Unlike most ±0.5% Typical Center Frequency Accuracy monolithic filters, no clock is needed. Four independent 2nd ±0.3% Typical Center Frequency Accuracy (A Grade) order filter blocks can be cascaded in any combination, such Wide Variety of Response Shapes as one 8th order or two 4th order filters. Each block’s Lowpass, Bandpass and Highpass Responses response is programmed with three external resistors for 103d B Typical S/N, ±5V Supply (Q = 1) center frequency, Q and gain, using simple design formulas. 97d B Typical S/N, Single 5V Supply (Q = 1) Each 2nd order block provides lowpass and bandpass out- 96d B Typical S/(N + THD) at ±5V Supply, 20k Hz Input puts. Highpass response is available if an external capacitor Rail-to-Rail Input and Output Voltages replaces one of the resistors. Allpass, notch and elliptic DC Accurate to 3m V (Typ) responses can also be realized. “Zero-Power” Shutdown Mode

The LTC1562 is designed for applications where dynamic

Single or Dual Supply, 5V to 10V Total

range is important. For example, by cascading 2nd order

Resistor-Programmable f O, Q, Gain

sections in pairs, the user can configure the IC as a dual 4th APPLICATIONS order Butterworth lowpass filter with 94d B signal-to-noise ratio from a single 5V power supply. Low level signals can

GA IN (d B)

High Resolution Systems (14 Bits to 18 Bits) exploit the built-in gain capability of the LTC1562. Varying the Antialiasing/Reconstruction Filters gain of a section can achieve a dynamic range as high as Data Communications, Equalizers 118d B with a ±5V supply. Dual or I-and-Q Channels (Two Matched 4th Order

Other cutoff frequency ranges can be provided upon request.

Filters in One Package)

Please contact LTC Marketing.

Linear Phase Filtering

Replacing LC Filter Modules , LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATION

Amplitude Response

Dual 4th Order 100k Hz Butterworth Lowpass Filter

RIN2, 10k

VIN2 INV B INV C

RQ1, 5.62k RQ2, 13k –20

R21, 10k SCHEMATIC INCLUDES PIN

V2 B V2 C NUMBERS FOR 20-PIN PACKAGE.

VOUT2 –40 PINS 4, 7, 14, 17 (NOT SHOWN)

V+ LTC1562 V– –5V5V

ALSO CONNECT TO V–

SHDN AGND SEE TYPICAL APPLICATIONS

R23, 10k VOUT1 –60 FOR OTHER CUTOFF FREQUENCIES

R24, 10k DC ACCURATE, NONINVERTING, –70

RIN3 V1 A V1 D

UNITY-GAIN, RAIL-TO-RAIL

10k RQ3, 5.62k RQ4, 13k –80

INPUT AND OUTPUTS. PEAK

VIN1 INV A INV D 10k 100k 1M

1562 TA01 SNR ≈ 100d B WITH ±5V SUPPLIES

FREQUENCY (Hz)

RIN4, 10k 1562 TA03b