AS

“АLFA RPAR”

Joint Stock Company ALFA

Riga, Latvia www.alfarzpp.lv; alfa@alfarzpp.lv

1

2018 v.6

AS3320

AS3320 - Voltage controlled filter (VCF)

FEATURES

APPLICATIONS



voltage controllable frequency - 12 octave range



voltage controllable resonance - from zero to

oscillation



accurate exponential frequency scale



accurate linear resonance scale



low control voltage feedthrough -45dB typical



filter configurable into LPF, HPF, all pass, etc.



low noise: -86dB typical



low distortion in passband - 0.1% typical



low warm up drift



configurable into low distortion voltage controlled

sine wave oscillator



bandwidth till 800kHz

for electronic music

AS3320

AS3320F

РDIP-18 (300 mil)

QFN-24 4x4mm 0,5mm

General Description

The AS3320 is a high performance voltage controlled four-pole filter with on-chip voltage controllable resonance IC.

The four independent sections may be interconnected to provide a wide variety of filter responses, such as low pass, high

pass, band pass and all pass. A single input exponentially controls the frequency over greater than a ten octave range with

little control voltage feedthrough. Another input controls the resonance in a modified linear manner from zero to low

distortion oscillation. For those demanding applications, provision has been made to allow trimming for improved control

voltage rejection. Each filter section features a variable gain cell which is fully temperature compensated, exhibits a bette r

signal-to-noise ratio and generates its low distortion predominantly in the second harmonic. The device includes a minus

two volt regulator to ensure low power dissipation and consequent low warm-up drift.

Power pad in QFN package highly improves thermal stability of parameters of AS3320F.

Pin Information

Circuit Block and Connection Diagram (PDIP-18)

РDIP-18

Pin No

QFN-24L

Pin No

Pin

Name

Description

1

4

IN1

Input Stage 1

2

5

IN2

Input Stage 2

3

7

GND

Ground

4

8

Cap2

Capacitor Stage 2

5

9

Cap1

Capacitor Stage 1

6

11

Out2

Output Stage 2

7

12

Out1

Output Stage 1

8

14

Vres

Resonance Input

9

15

Ires

Resonance

Control Input

10

16

Out4

Output Stage 4

11

17

Cap4

Capacitor Stage 4

12

19

Voltage Control

Frequency Input

13

20

Vee

Negative power

14

22

Vcc

Positive power

15

23

Out3

Output Stage 3

16

24

Cap3

Capacitor Stage 3

17

2

IN3

Input Stage 3

18

3

IN4

Input Stage 4

-

Power

pad

Power

pad

Don’t connect

SIGNAL INPUT

SIGNAL

OUTPUT

FREQ. CNTL.

INPUT

100K

220K

100K

100



91K

91K

91K

91K

100K

100K

100K

1,0

-15V

-15V

+15V

18

IN3

Cap3

Out3

Vee

Cap4

Out4

(1,5-2,2)K

1,8K

100K

300pF

1

Cap2

Cap1

Out2

Out1

Vres

Ires

300pF

300pF

300pF

51K

3,6K

-1,9V

REG.

B

B

B

B

e

x

C.V.

REJ.

BIAS

A

A

A

A









TOP

VIEW

Vcc

V-

.

.

RESONANCE

CNTL. INPUT

+

IN1

IN2

GND

IN4

Absolute Maximum Ratings

Voltage between Vcc and Vee pins

Voltage between Vcc and GND pins

Voltage between Vee and GND pins

Voltage between Cell Input and GND pins

Voltage between Frequency Control and GND pins

Voltage between Resonance Control and GND pins

Current through any pin

Storage Temperature Range

Operating Temperature Range

+22V, -0,5V

+18V, -0,5V

-4V, -0,5V

+0,5V, -6V

±6V

+2V, -18V

±40mA

- 55

°C to 150°C

-

25°C to 75°C