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LTC1562CG Datasheet(PDF) 1 Page - Linear Technology |
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LTC1562CG Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1562 Very Low Noise, Low Distortion Active RC Quad Universal Filter FEATURES DESCRIPTION s Continuous Time—No Clock s Four 2nd Order Filter Sections, 10kHz to 150kHz 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 103dB Typical S/N, ±5V Supply (Q = 1) s 97dB Typical S/N, Single 5V Supply (Q = 1) s 96dB Typical S/(N +THD) at ±5V Supply, 20kHz Input s Rail-to-Rail Input and Output Voltages s DC Accurate to 3mV (Typ) s “Zero-Power” Shutdown Mode s Single or Dual Supply, 5V to 10V Total s Resistor-Programmable fO, Q, Gain The LTC ®1562 is a low noise, low distortion continuous-time filter with rail-to-rail inputs and outputs, optimized for a center frequency (fO) of 10kHz to 150kHz. Unlike most monolithic filters, no clock is needed. Four independent 2nd order filter blocks can be cascaded in any combination, 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 out- puts. 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 94dB 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 achieve a dynamic range as high as 118dB with a ±5V supply. Other cutoff frequency ranges can be provided upon request. Please contact LTC Marketing. FREQUENCY (Hz) 10k 10 0 –10 –20 –30 –40 –50 –60 –70 –80 100k 1M 1562 TA03b Amplitude Response 1 2 3 5 6 8 9 10 20 19 18 16 15 13 12 11 INV B V1 B V2 B V+ SHDN V2 A V1 A INV A INV C V1 C V2 C V– AGND V2 D V1 D INV D LTC1562 RIN2, 10k RIN4, 10k RIN1 10k VIN2 VIN1 SCHEMATIC INCLUDES PIN NUMBERS FOR 20-PIN PACKAGE. PINS 4, 7, 14, 17 (NOT SHOWN) ALSO CONNECT TO V – SEE TYPICAL APPLICATIONS FOR OTHER CUTOFF FREQUENCIES DC ACCURATE, NONINVERTING, UNITY-GAIN, RAIL-TO-RAIL INPUT AND OUTPUTS. PEAK SNR ≈ 100dB WITH ±5V SUPPLIES VOUT1 1562 TA01 VOUT2 RIN3 10k –5V 5V RQ1, 5.62k R21, 10k R23, 10k 0.1 µF 0.1 µF RQ3, 5.62k R24, 10k RQ4, 13k RQ2, 13k R22, 10k TYPICAL APPLICATION Dual 4th Order 100kHz Butterworth Lowpass Filter APPLICATIONS s High Resolution Systems (14 Bits to 18 Bits) s Antialiasing/Reconstruction Filters s Data Communications, 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 , LTC and LT are registered trademarks of Linear Technology Corporation. |
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