LTC1562-2 Very Low Noise, Low Distortion Active RC Quad Universal Filter FEATURES DESCRIPTIO n Continuous TimeNo Clock The LTC 1562-2 is a low noise, low distortion continuous n Four 2nd Order Filter Sections, 20kHz to 300kHz time filter with rail-to-rail inputs and outputs, optimized for a Center Frequency center frequency (f ) of 20kHz to 300kHz. Unlike most O n 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 n Lowpass, Bandpass, Highpass Responses as one 8th order or two 4th order filters. Each blocks n 99dB Typical S/N, 5V Supply (Q = 1) response is programmed with three external resistors for n 93dB Typical S/N, Single 5V Supply (Q = 1) center frequency, Q and gain, using simple design formulas. n Rail-to-Rail Input and Output Voltages Each 2nd order block provides lowpass and bandpass out- n DC Accurate to 3mV (Typ) puts. Highpass response is available if an external capacitor n 0.5% Typical Center Frequency Accuracy replaces one of the resistors. Allpass, notch and elliptic n Zero-Power Shutdown Mode responses can also be realized. n Single or Dual Supply, 5V to 10V Total The LTC1562-2 is designed for applications where dynamic n Resistor-Programmable f , Q, Gain O range is important. For example, by cascading 2nd order U sections in pairs, the user can configure the IC as a dual 4th APPLICATIO S order Butterworth lowpass filter with 90dB signal-to-noise ratio from a single 5V power supply. Low level signals can n High Resolution Systems (14 Bits to 18 Bits) exploit the built-in gain capability of the LTC1562-2. Varying n Antialiasing/Reconstruction Filters the gain of a section can achieve a dynamic range as high as n Data Communications, Equalizers 114dB with a 5V supply. n Dual or I-and-Q Channels (Two Matched 4th Order Filters in One Package) Other cutoff frequency ranges can be provided upon request. n Linear Phase Filtering Please contact LTC Marketing. n Replacing LC Filter Modules , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Amplitude Response Dual 4th Order 200kHz Butterworth Lowpass Filter, SNR 96dB 10 R 7.87k IN2 0 V OUT1 R 7.87k IN1 1 20 10 INV B INV C V IN1 R 4.22k R 10.2k Q1 Q2 2 19 20 V1 B V1 C R21 7.87k R22 7.87k 3 18 30 V2 B V2 C 5 16 40 + 5V V LTC1562-2 V 5V* 0.1F 0.1F 6 15 50 SHDN AGND R23 7.87k R24 7.87k 8 13 60 V2 A V2 D R 4.22k R 10.2k Q3 9 12 Q4 70 V1 A V1 D R 7.87k IN3 10 11 80 INV A INV D V IN2 50k 100k 1M 1.5M V OUT2 FREQUENCY (Hz) R 7.87k *V ALSO AT PINS 4, 7, 14 & 17 IN4 1562-2 TA01 ALL RESISTORS 1% METAL FILM 1562-2 TA02 15622fa 1 GAIN (dB) U ULTC1562-2 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) + Total Supply Voltage (V to V ) .............................. 11V ORDER PART TOP VIEW Maximum Input Voltage NUMBER INV B 1 20 INV C + V1 B 2 19 V1 C at Any Pin ....................(V 0.3V) V (V + 0.3V) V2 B 3 18 V2 C Storage Temperature Range ................. 65 C to 150 C * * LTC1562CG-2 V 4 17 V + V 5 16 V Operating Temperature Range LTC1562IG-2 SHDN 6 15 AGND * * LTC1562C-2 ............................................ 0 C to 70 C V 7 14 V V2 A 8 13 V2 D LTC1562I-2 ........................................ 40 C to 85 C V1 A 9 12 V1 D Lead Temperature (Soldering, 10 sec).................. 300 C INV A 10 11 INV D G PACKAGE 20-LEAD PLASTIC SSOP *G PACKAGE PINS 4, 7, 14, 17 ARE SUBSTRATE/SHIELD CONNECTIONS AND MUST BE TIED TO V T = 150 C, q = 136 C/W JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V, outputs unloaded, SHDN pin to logic low, unless otherwise noted. AC A S specs are for a single 2nd order section, R = R2 = 10.4k 0.1%, R = 9.09k 0.1%, f = 175kHz. IN Q O SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Total Supply Voltage 4.75 10.5 V S I Supply Current V = 2.375V, R = 5k, C = 30pF, Outputs at 0V 21 23.5 mA S S L L V = 5V, R = 5k, C = 30pF, Outputs at 0V 22.5 25 mA S L L V = 2.375V, R = 5k, C = 30pF, Outputs at 0V l 28 mA S L L V = 5V, R = 5k, C = 30pF, Outputs at 0V l 30 mA S L L Output Voltage Swing, V2 Outputs V = 2.375V, R = 5k, C = 30pF l 4.2 4.6 V S L L P-P V = 5V, R = 5k, C = 30pF l 9.3 9.8 V S L L P-P Output Voltage Swing, V1 Outputs V = 2.375V, R = 5k, C = 30pF, f = 250kHz 4.5 V S L L P-P V = 5V, R = 5k, C = 30pF, f = 250kHz 8.4 9.7 V S L L P-P V DC Offset Magnitude, V2 Outputs V = 2.375V, Input at AGND Voltage 3 17 mV OS S V = 5V, Input at AGND Voltage 3 17 mV S DC AGND Reference Point V = Single 5V Supply 2.5 V S Center Frequency (f ) Error (Notes 2, 3) V = 5V, V2 Output Has R = 5k, C = 30pF 0.5 1.7 % O S L L H Lowpass Passband Gain at V2 Output V = 2.375V, f = 10kHz, l 0 + 0.05 +0.1 dB L S IN V2 Output Has R = 5k, C = 30pF L L Q Accuracy V = 2.375V, V2 Output Has R = 5k, C = 30pF +2 % S L L Wideband Output Noise V = 2.375V, BW = 400kHz, Input AC GND 39 m V S RMS V = 5V, BW = 400kHz, Input AC GND 39 m V S RMS Input-Referred Noise, Gain = 100 BW = 400kHz, f = 200kHz, Q = 1, Input AC GND 7.3 m V O RMS 15622fa 2 U WWW