Gennum Corporation GA3203 Datasheet

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington Ontario, Canada L7R 3Y3 tel. [phone]

Web Site: www.gennum.com E-mail: [e-mail]

FEATURES

• low & high frequency gain adjustment

• adjustable high frequency compression ratio
(1:1 to 4:1)

• fixed low frequency compression ratio (3:1)

• twin average detection™

• 24dB/octave band split filter

• 8:1 output compression limiting

• notch filter to minimize acoustic feedback

• pre & post emphasis circuitry

• low level squelch control (1:2 expansion)

• multi memory (4)

• 8 programmable parameters

thinSTAX™ PACKAGING

Hybrid typical dimensions:

0.200 x 0.128 x 0.060in.
(5.08 x 3.25 x 1.52mm)

DESCRIPTION

The GA3203 programmable hybrid is composed of a
DynamEQ

®

III Wide Dynamic Range Compression signal

processor and the GP523 controller memory chip.
The hybrid has 8 programmable parameters including Low

Frequency Gain, High Frequency Gain, High Frequency
Compression Ratio, Band Split Filter Crossover Frequency,
AGC-I Threshold Kneepoint, AGC-O Threshold, Volume Control
and Notch Feedback Control.

The DynamEQ

®

III includes a squelch circuit which attenuates
microphone and circuit noise in quiet environments and high
gain conditions. It also includes low distortion compression
limiting AGC-O, pre and post emphasis circuitry, and an
acoustic feedback notch filter.

The GA3203 hybrid code programmed into the GP523 is “4”.

PRELIMINARY DATA SHEET

GA3203 Programmable

DynamEQ

®

III

BLOCK DIAGRAM

Revision Date: December 2000 Document No. 522 - 13 - 02

GA3203

IN

GND

MS

C3

C1

C19

C20

1

FAST

DETECTOR

CONTROL

RECTIFIER

REGULATOR

5

C6

3

GP523

2

COMPRESSOR

R2

C13

GA3203

7

C18

C2

8

B

IN

B

OUT

RECTIFIER

9

C17

C21

45k5

80n

80n

8n

20n

150n

20n

100n

10n

100n

8n

SQUELCH

DETECTOR

SDA

10

C4

15n

R5
92k

1

X

1

X

R6

185k

R8
92k

R3

185k

NOTCH

AGC-O

R7

460k

SW

C15

4n

C14

100n

RsquelchRagc

R1

24 dB / Oct

BAND SPLIT

FILTER

Lp

Hp

64k

OUT

6

C16

30n

R4

184k

18k

I REF

R9

- A

- B

- C

4

V

REG

GND

SLOW

DETECTOR

COMPRESSOR

V

B

All resistors in ohms, all capacitors in farads, unless otherwise stated.

V

REF

2

522 - 13 - 02

GA3203

ABSOLUTE MAXIMUM RATINGS
PARAMETER VALUE

PAD CONNECTION

ELECTRICAL CHARACTERISTICS

Conditions: Supply Voltage VB = 1.3VDC, Frequency = 3kHz, Temperature = 25°C
The programmable parameters are adjusted to the following set values unless otherwise specified:
(FC) R1 - Tap 15; (TH) R2 - Tap 15; (GHI) R3 - Tap 0; (CRHI) R4 - Tap 15; (MPO) R5 - Tap 4; (GLO) R6 - Tap 15;
(NOTCH) R7 - Tap 24; (VC) R8 - Tap 23; (Squelch) SW - CLOSED (0).

Supply Voltage 2VDC
Power Dissipation 25mW
Operating Temperature Range -10°C to 40°C
Storage Temperature Range -20°C to 70°C

CAUTION

ELECTROSTATIC

SENSITIVE DEVICES

DO NOT OPEN PACKAGES OR HANDLE

EXCEPT AT A STATIC FREE WORKSTATION

NOTE 1: Measured at output of Stage B

2

5

6

7

8

9

10

1

4

3

V

REG

IN GND GND MS

OUT

V

B

B

IN

B

OUT

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522 - 13 - 02

GA3203

ELECTRICAL CHARACTERISTICS (CONTINUED)

Conditions: Supply Voltage VB = 1.3VDC, Frequency = 3kHz, Temperature = 25°C
The programmable parameters are adjusted to the following set values unless otherwise specified:
(FC) R1 - Tap 15; (TH) R2 - Tap 15; (G

HI

) R3 - Tap 0; (CRHI) R4 - Tap 15; (MPO) R5 - Tap 4; (GLO) R6 - Tap 15;

(NOTCH) R7 - Tap 24; (VC) R8 - Tap 23; (Squelch) SW - CLOSED (0).

NOTE 1: Measured at output of Stage B

SUPPORT SOFTWARE

All support software for the GA3203 and the GP523 is
available from Gennum’s website:

www.gennum.com/hip/software

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