LTC1562 Very Low Noise, Low Distortion Active RC Quad Universal Filter FEATURES DESCRIPTIO n Continuous TimeNo Clock The LTC 1562 is a low noise, low distortion continuous-time n Four 2nd Order Filter Sections, 10kHz to 150kHz filter with rail-to-rail inputs and outputs, optimized for a Center Frequency center frequency (f ) of 10kHz to 150kHz. Unlike most O n 0.5% Typical Center Frequency Accuracy monolithic filters, no clock is needed. Four independent 2nd n 0.3% Typical Center Frequency Accuracy (A Grade) order filter blocks can be cascaded in any combination, such n Wide Variety of Response Shapes as one 8th order or two 4th order filters. Each blocks n Lowpass, Bandpass and Highpass Responses response is programmed with three external resistors for n 103dB Typical S/N, 5V Supply (Q = 1) center frequency, Q and gain, using simple design formulas. n 97dB Typical S/N, Single 5V Supply (Q = 1) Each 2nd order block provides lowpass and bandpass out- n 96dB Typical S/(N + THD) at 5V Supply, 20kHz Input puts. Highpass response is available if an external capacitor n Rail-to-Rail Input and Output Voltages replaces one of the resistors. Allpass, notch and elliptic n DC Accurate to 3mV (Typ) responses can also be realized. n Zero-Power Shutdown Mode The LTC1562 is designed for applications where dynamic n Single or Dual Supply, 5V to 10V Total range is important. For example, by cascading 2nd order n Resistor-Programmable f , Q, Gain O sections in pairs, the user can configure the IC as a dual 4th U order Butterworth lowpass filter with 94dB signal-to-noise APPLICATIO S 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. Varying the n Antialiasing/Reconstruction Filters gain of a section can achieve a dynamic range as high as n Data Communications, Equalizers 118dB with a 5V supply. n 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. n Linear Phase Filtering n , LTC and LT are registered trademarks of Linear Technology Corporation. Replacing LC Filter Modules TYPICAL APPLICATIO Amplitude Response Dual 4th Order 100kHz Butterworth Lowpass Filter 10 0 R , 10k IN2 R IN1 10 10k 1 20 INV C V INV B IN2 R , 5.62k R , 13k 20 Q1 Q2 2 19 V1 C V1 B 30 R21, 10k R22, 10k SCHEMATIC INCLUDES PIN 3 18 V2 C V2 B NUMBERS FOR 20-PIN PACKAGE. V 40 OUT2 5 16 PINS 4, 7, 14, 17 (NOT SHOWN) + 5V LTC1562 V 5V V ALSO CONNECT TO V 0.1F 0.1F 50 6 15 AGND SHDN SEE TYPICAL APPLICATIONS V R23, 10k OUT1 8 13 60 FOR OTHER CUTOFF FREQUENCIES V2 D V2 A R24, 10k DC ACCURATE, NONINVERTING, 9 12 70 R V1 D IN3 V1 A UNITY-GAIN, RAIL-TO-RAIL 10k R , 13k R , 5.62k 10 11 Q4 Q3 INPUT AND OUTPUTS. PEAK 80 INV D V INV A IN1 10k 100k 1M 1562 TA01 SNR 100dB WITH 5V SUPPLIES FREQUENCY (Hz) R , 10k IN4 1562 TA03b 1562fa 1 GAIN (dB) U UPACKAGE/ORDER INFORMATION LTC1562 (Note 1) ABSOLUTE AXI U RATI GS + Operating Temperature Range Total Supply Voltage (V to V ) .............................. 11V LTC1562C ............................................... 0 C to 70 C Maximum Input Voltage + LTC1562I............................................ 40 C to 85 C at Any Pin ....................(V 0.3V) V (V + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300 C Storage Temperature Range ................. 65 C to 150 C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART TOP VIEW INV B 1 20 NUMBER NUMBER INV C INV B 1 V1 B 2 16 INV C 19 V1 C V2 B 3 18 V2 C V1 B 2 15 V1 C * * V 4 17 V LTC1562CG LTC1562CN + V2 B 3 14 V2 C V 5 16 V LTC1562ACG + SHDN 6 15 AGND V 4 13 V * * V 7 14 V LTC1562IG SHDN 5 12 AGND V2 A 8 13 V2 D LTC1562AIG V1 A 9 12 V1 D V2 A 6 11 V2 D INV A 10 11 INV D V1 A 7 10 V1 D G PACKAGE INV A 8 9 INV D 20-LEAD PLASTIC SSOP *G PACKAGE PINS 4, 7, 14, 17 ARE N PACKAGE SUBSTRATE/SHIELD CONNECTIONS 16-LEAD PDIP AND MUST BE TIED TO V T = 150 C, q = 90 C/W JMAX JA 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 the 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, A S unless otherwise noted. AC specs are for a single 2nd order section, R = R2 = R =10k 0.1%, f = 100kHz, unless noted. 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 17.3 19.5 mA S S L L = 5V, R = 5k, C = 30pF, Outputs at 0V 19 21.5 mA V S L L V = 2.375V, R = 5k, C = 30pF, Outputs at 0V l 23.5 mA S L L V = 5V, R = 5k, C = 30pF, Outputs at 0V l 25.5 mA S L L Output Voltage Swing V = 2.375V, R = 5k, C = 30pF l 4.0 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 V DC Offset Magnitude, V2 Outputs V = 2.375V, Input at AGND Voltage l 315 mV OS S (Lowpass Response) V = 5V, Input at AGND Voltage l 315 mV S DC AGND Reference Point V = Single 5V Supply 2.5 V S Center Frequency (f ) Error (Note 2) O LTC1562 (SSOP) V = 5V, V2 Output Has R = 5k, C = 30pF 0.5 1.0 % S L L LTC1562A (SSOP) V = 5V, V2 Output Has R = 5k, C = 30pF 0.3 0.6 % S L L LTC1562 (PDIP) V = 5V, V2 Output Has R = 5k, C = 30pF 0.6 1.5 % S L L H LP Passband Gain (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 H BP Passband Gain (V1 Output) V = 2.375V, f = f , l +0.2 +0.5 dB B S IN O V2 Output Has R = 5k, C = 30pF L L 1562fa 2 U WWW U W U