MSU2HF1P

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The high frequency resistor programmable universal active filter is a CMOS chip that can be configured for Lowpass, Bandpass, Highpass, Elliptic, Notch or Allpass filters using external resistors. The filters come in one (8 pin) or two (16 pin) section ver- sions. The device is a switched-capacitor filter using a topology that requires fewer pins, less power consumption and provides higher frequency performance than other switched-capacitor universal active filters. The clock to corner ratio as well as the Q are set by external resistors. Depending on the filter type and response, from zero to nine external resistors are needed for each section. The sections may be cascaded to realize higher order filters. The devices have a selectable nominal sample to corner ratio of either 6.25 to 1 or 12.5 to 1 and come in either a low power version (fo<100 kHz)or a higher power version (fo<500kHz). The devices are double sampled to reduce the clock frequency by a factor of two. Low Power Consumption High Frequency Operation Low Cost Small Package Size 8 or 16 pin DIP or SOIC Wide Q Range 0.5 to over 20 Wide Clock to Center/Corner Frequency Range 6.25:1 to over 50:1 Accurate Switched-Capacitor Technology General Purpose Filtering Portable Equipment Instrumentation Absolute Maximum Ratings ______ Power Supply Voltage +6v Storage Temperature -60 to +150 °C Operating Temperature 0 to 70 °C MSU1HF1/4,MSU2HF1 High Frequency Resistor Programmable Universal Active Filter Data Sheet Part Number MSU1HF1P MSU1HF1S MSU1HF2P MSU1HF2S MSU1HF3P MSU1HF3S MSU1HF4P MSU1HF4S MSU2HF1P MSU2HF1S Package

8 Pin Dip

8 Pin SOIC

16 Pin Dip

16 Pin SOIC

0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C 0 - 70°C Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 1

EElleeccttrriiccaall CChhaarraacctteerriissttiiccss___________ MSU1HF1/4,MSU2HF1 High Frequency Resistor Programmable Universal Active Filter Data Sheet Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 2 note(1): the clock to corner ratio is one-half the sample to corner ratio note(2): 100mV sine wave clock requires capacitive coupling PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS DC Specifications Operating Voltage VDD 4.5 5.0 5.5 V Supply Current IDD MSU2HF1 PWR = 1 8 mA MSU2HF1 PWR = 0 25 mA MSU1HF1/3 6 mA MSU1HF2/4 15 mA Output Impedance 700 ohm Output Offset 20 mV AC Specifications Output Swing 4.0 4.5 Vp-p Input Impedance Zin 1 Mohm Nominal Sample to Fo MSU2HF1 FO = 1 6.25 corner FO = 0 12.5 MSU1HF1/2 6.25 MSU1HF3/4 12.5 Center/Corner Range MSU2HF1 PWR = 1 100 KHz note(1) PWR = 0 500 KHz MSU1HF1/3 100 KHz MSU1HF2/4 500 KHz Clock Input Voltage CKin 0.1note(2) 5 Vp-p LP OUT C SCF R SCF SCF R R/4 CF01 C BP1 HP BP C CHP o o o o o o o CF02 *R/2 R/2 *BPP input is noninverting

16 Pin 8 Pin

1 PWR Power Select Pin 0 = High 1 = Low

2 8 VSS Negative S upply, Typically 0V for single supply, - 2.5 V for dual supply 3 1 OUT1 Section One Output 4 5 GND Ground Reference, Typically 2.5V for single supply, 0V for dual supply 5 2 LP1 Section One Lowpass Input 6 3 BPN1 Section One Negative Bandpass Input

7 BPP1 Section One Positive B andpass Input

8 4 HP1 Section One High Pass Input

9 HP2 Section Two High Pass Input

10 BPP2 Section Two Positive Bandpass Input

11 BPN2 Section Two Negative Bandpass Input

12 LP2 Section Two Lowpass Input

13 6 CLK Input Clock, Typically 200mV for AC coupled sine wave, 5V for CMOS input

14 OUT2 Section Two Output

15 FO Clock to Center/Corner, Select Pin, Low = 6.25 to 1 High = 3.125 (sample rate is 2x) 16 7 VDD Positive Supply, Typically 5V for single supply, 2.5V for dual supply MSU1HF1/4,MSU2HF1 4 5 OUT LP BP HP GND CLK VDD VSS PWR VSSA OUT1 GND LP1 BPN1 BPP1 HP1 HP2 BPP2 BPN2 LP2 CLK OUT2 FO VDDA8 PIN 16 PIN Pin Configurraation High Frequency Resistor Programmable Universal Active Filter Data Sheet Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 3

Lowpass elliptical yes yes Highpass elliptical yes yes Notch yes yes Oscillator yes no Allpass yes no Biquad yes no Lowpass H(s) = - ω02 S + (ω0/Q)S + ω0 Bandpass Η(s) = −(ω0/Q)S S + (ω0/Q)S + ω0 Highpass Η(s) = S S + (ω0/Q)S + ω0 Lowpass Elliptic Η(s) = (ω0/ωz) S + ω0 S + (ω0/Q)S + ω0 Highpass Elliptic Η(s) = S + (ωz/ω0) S + (ω0/Q)S + ω0 Notch Η(s) = S + ω0 S + (ω0/Q)S + ω0 Allpass H(s) = S - (ω0/Q)S + ω0 S + (ω0/Q)S + ω0 LP Vout BP+ BP- HP- ΣΣ ΣΣ MSU1HF1/4,MSU2HF1 Block Diagram High Frequency Resistor Programmable Universal Active Filter Data Sheet Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 4 % ERROR Q % ERROR fc/fo 25 5 0.5 Q 12.5 6.25 3.125 fc/fo Q =0.5 Q = 5 Q =25 fc/fo=3.125 fc/fo=6.25 fc/fo=12.5

For lowpass, lowpass elliptical, highpass elliptical, allpass and notch filters. This limitation due to the particular ratio of R1 and R2 and allows realizable values of R3. Other minimum values of fc/fo can be obtained by using other values of R1 and R2 in the basic biquad equations. NOTE: fc >36 fo LP HP BP+ BP- LOWPASS OUT IN VOUT Assumption (1) R1 = R2; DC Gain = Unity f0 = 4 K1 . fc K1 = R3 α (2) R1 + 2R3 Q = 4 K1 K2 = R6 K2 R4 + R6 (1) If a gain other than unity is desired then gain = R1/R2 and K1 from the biquad equations should be substituted for K1 (2) where α is 6.25 or 12.5. LP HP BP+ BP- NON-INVERT BANDPASS OUT IN VOUT Gain (1) = 1 f0 = 3K1 . fc K 1 = R3 α(2) R1 + R3 Q = 3K1 K2 = R6 K2 R4 + R6 (1) Gain may be adjusted independent of Q using the resistor divider described by K5 from the biquad equations. Use the K5 equation in place of K2 for the gain equation only. (2) where α is 6.25 or 12.5. e LP HP BP+ BP- OUT IN VOUT INVERTING BANDPASS Assumption(1) R4 = R5; Gain = Unity f0 = 4K1 . fc K1 = R3 α(2) R1 + R3 Q = 4K1 K2 = R6 K2 R4 + 2R6 (1) For gains not equal to unity, gain = R4/R5 and K2 should be replaced with K2 from the biquad equations. (2) where α is 6.25 or 12.5. Gain = Unity f0 = 4K1 . fc K1 = R3 α(1) R1 + R3 Q = 4K1 K2 = R6 K2 R4 + R6 (1) where α is 6.25 or 12.5. MSU1HF1/4,MSU2HF1 LP HP BP+ BP- HIGHPASS OUT IN VOUT High Frequency Resistor Programmable Universal Active Filter Data Sheet Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 5

DC Gain (1) = Unity; R 1 = R2 f0 = 3K1 . fc K 1 = R3 α R1 + 2R3 Q = 3K1 K2 = R6 K2 R4 + R6 fz = 1 . f0 K3 = R10

3 K3 R9 + R10

(1) For gain other than unity, gain = R 1/R2 and K1 from the bequad equation should be sub- stituted for K1. The 31/K3 term should also be multiplied by the gain. (2) where α is 6.25 or 12.5. LP HP BP+ BP- OUT IN VOUT ELLIPTICAL LOWPASS R10 Gain = Unity (1) f0 = 3K1 . fc α Q = 3K1 K1 = R2R3 K2 R1R2 + R1R3 + R2R3 fz =R 1 . f0 K2 = R6

3 R2 R4 + R6

(1) For this case only, the resistor value R 1 and R2 should be determined for fz before the resistor values for f0 (R3) are calculated (2) where α is 6.25 or 12.5. (1) (2) f0 =R 3 . fc R 4 ≅ 20 3R1 + R3 α R6 (1) f0 is also a function of the feedback coeffi- ent defined by R4 and R6 and can vary con- siderably from the calculated value. For a fixed feedback coefficient, f0 will not vary by more than plus or minus 1%. (2) The distortion of the sine wave can be adjusted by varying this ratio. (3) where α is 6.25 or 12.5. LP HP BP+ BP- OSCILLATOR OUTVOUT LP HP BP+ BP- OUT IN VOUT ALLPASS Gain = Unity; R1 = R2; R7 = R4; R8 = R6 f0 = 3K1 . fc K 1 = R3 α R1 + 2R3 Q = 3K1 K2 = R6 K2 R4 + R6 (1) where α is 6.25 or 12.5. LP HP BP+ BP- OUT IN VOUT ELLIPTICAL HIGHPASS MSU1HF1/4,MSU2HF1 High Frequency Resistor Programmable Universal Active Filter Data Sheet Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 6

Gain = Unity; R1 = R2 f0 = 3K1 . fc K 1 = R3 α R1 + 2R3 Q = 3K1 K2 = R6 K2 R4 + R6 (1) where α is 6.25 or 12.5. The biquad is the most general purpose filter type. By adjusting the values of K1 through K6, virtually any second order transfer function can be achieved. In some cases, it may be necessary to use an inverting op amp to achieve the correct polarity on these constants. VOUT = VIN [ -K 3S2 - K4S fc + K5S fc - K6 fc2 ] 4 4 16 S2 K2S fc + K1 Fc2 4 16 K1 = R2R3 K4 = R4R6 R1R2 + R1R3 + R2R3 R4R5 + R4R6 + R5R6 K2 = R 5R6 K5 = R8 R4R5 + R4R6 + R5R6 R7 + R8 K3 = R10 K6 = R1R3 R9 + R10 R1R2 + R1R3 + R2R3 MSU1HF1/4,MSU2HF1 LP HP BP+ BP- OUTIN VOUT BIQUAD R10 R9 R7 Web Site “www.mix-sig.com” © 1998 Mixed Signal Integration 7 High Frequency Resistor Programmable Universal Active Filter Data Sheet