HM2040a VOLTAGE CONTROLLED FILTER CIRCUIT DESCRIPTION The HM2040 is a four section filter whose cutoff frequency can be exponentially controlled over a 10,000 to 1 range. This flexible building block can be used in virtually any active filter design including lowpass, highpass, bandpass and notch. Rolloff characteristics can be selected to be Butterworth, Bessel, Chevyshev or any other filter type.

FEATURES

APPLICATIONS

+/- 15V Supplies

Voltage Controlled Filters

4 Filter Sections in One Package

Parametric Equalizers

Low Noise

Music Synthesizers

Low Distortion

Music Phase Shifters

Low Control Feed-through

Tracking Filters

10,000:1 Sweep Range

Low Distortion Sine VCO’s

G = Variable Transconductance Amplifier B = High Input Impedance Buffer CTRL

IN3

1

16

V+

CAP3

2

15

CAP2

CAP

OUT

IN

G OUT3

3

14

IN2

IN4

4

13

OUT2

CAP4

5

12

CAP1

OUT4

6

11

IN1

GND

7

10

OUT1

CTRL

8

9

V-

CAP

EXPONENTIAL FUNCTION GENERATOR

B

OUT

IN

Pin Diagram

Hearn Morley Ground Floor, 7 West Mall, Clifton, Bristol [email protected] 01179737690

G

OUT

IN

G

OUT

IN

G

B

CAP

B

CAP

Block Diagram

B

Specifications Vs=+/-15V, TA=25oC

SPECIFICATION

CONDITIONS

Functional Range Input Offset, each cell ∆Input Offset, 4 cells in series

MIN

Vcntl=0mV,-90mV Vctrl=0mV,+90mV Vctrl=0 20Hz-20kHz, Vctrl=-90mV F=1kHz, Vctrl=-90mV Vctrl=0

Transconductance Equiv. Input Noise, each cell Distortion (THD), Ein=30mVpp Tempco of Transconductance Control Sensitivity Tempco of Control Sensitivity Power Supply Current Buffer Slew Rate Buffer Output Sink Current

TYP

MAX

10,000:1 2 0.6 0.6 1/5k 0.5 0.1 +0.5 -18 3300 3 2 575

1/6k

Vctrl=0 569

5 3 3 1/4k

UNIT mV mV mV mhos uV RMS % %/oC mV/Oct ppm/oC mA V/usec

5.5 585

Absolute Maximum Ratings Any pin to VCurrent at any pin Operating Temperature Storage Temperature Power Dissipation

36V 20mA 0-70oC -40 to +100oC 1W

Applications Figures Filter Type

Figure

Gain (K)

Lowpass – Real Pole 1 -R2/R1 Highpass – Real Pole 2 1 Allpass 3 1 State Variable LP 4 -R2/R1 State Variable BP 4 R2/R1 State Variable HP 4 -R2/R1 4-Pole Lowpass 5 -(R2/R1)^4 *=R5(2R1+R2)/(R1(R4_R5)); R4||R5 = R1||(R2/2) G = Variable Transconductance Amplifier

G

200G/R2C 200G/R2C 200G/R2C 200G/R3C 200G/R3C 200G/R3C 200G/R2C

XFER char.   ⁄ -K/(s+1) s/(s+1) (s-1)/(s+1) -K/(s2+ds+1) Ks/(s2+ds+1) -Ks2/(s2+ds+1) K^4/(s+1)^4

2 2 2 * * * -

B = High Input Impedance Buffer

B

G

C R1

d=1/Q



G

B

B

C1

C

R2 R 200R

Figure 1 – Lowpass Real Pole

200R

Figure 2-Highpass Real Pole

Hearn Morley Ground Floor, 7 West Mall, Clifton, Bristol [email protected] 01179737690

R1

R2 200R

Figure 3-Allpass (Phase-shift)

x

e

51k

V/Oct. 1k

+3300ppm/C G

B

G

B

G

B

G

B 100k

1n

INPUT

(20Vpp Max)

100k

1n

R5 10k 200R

1n

R10 10k

10k

1n

R13 10k

200R

10k 200R

R16 10k

10k

2 10k

200R

1

OUTPUT

3 TL072

Resonance 20k 10k

Hearn Morley Ground Floor, 7 West Mall, Clifton, Bristol [email protected] 01179737690

(Reverse Log.)

VOLTAGE CONTROLLED FILTER CIRCUITx - Synfo.nl

d=1/Q. XFER char. ⁄. Lowpass – Real Pole. 1. -R2/R1. 200G/R2C. 2. -K/(s+1). Highpass – Real Pole. 2. 1. 200G/ ... Ks/(s2+ds+1). State Variable HP. 4. -R2/R1.

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