Gennum Corporation GS3034 Datasheet

GS3034 - DATA SHEET

Revision Date: December 1998

Linear Class H

CIC Size Hybrid

FEATURES

• complete linear system

• current mode class H output stage

• current drive power amp

• low distortion / low noise

• low amplifier current 190

µA typical

• small size for CIC applications

STANDARD PACKAGING

• Hybrid Typical Dimensions (0.180in x 0.075in x 0.055in)
(4.57mm x 1.91mm x 1.40mm)

• Hybrid View

DESCRIPTION

The GS3034 hybrid offers Gennum’s new innovative class H
output stage along with two low noise inverting preamplifiers,
in a CIC size package.

This new breed of output stage adapts the bias current of the
receiver to the user's listening environment. In relatively loud
environments the receiver will be fully biased similar to a
traditional class A amplifier. However, as the loudness of the
environment decreases, the bias current of the receiver adjusts
to a minimum level required to cleanly pass the signal. At the
same time the system maintains adequate “headroom” should
the amplitude of the signal suddenly increase. By adapting
the bias of the output stage to the requirements of the signal
being processed, significant current savings can be realized
compared to traditional class A amplifiers.

The rate at which the bias adapts is associated with a capacitor
connected from pad CC of the hybrid to ground. For optimum
performance it is recommended that a 0.22 µF capacitor be
used.

The two low noise preamplifiers Stage A and Stage B, can be
used as Volume Control and Gain Trim elements or Stage A as
a filter shaping element and Stage B as the Volume Control. As
the output stage is current drive, frequency shaping is relatively
easy via the addition of a capacitor across the receiver.

V

REG

V

REG

GND

IN

B

OUT

B

IN

A

OUT

A

IN

R

E

V

B

CC

B

RIN

OUT

-

A

C1

170

24k

12k

­C2
0

µ1

CONTROL

REGULATOR

V

B

V

B

C3
0µ1

12k

B

+

-

+

-

C

0µ1

C4

15n

GS3034

10

5

9

8

3

2

112

11

7

6

4

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

FUNCTIONAL BLOCK DIAGRAM

Document No. 521 - 51 - 04

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

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

2

521 - 51 - 04

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OVERALL

Amplifier Current I

AMP

80 190 300 µA

Minimum Operating Voltage V

B

- - 1.1 V

Overall Gain A

V

44 47 50 dB

Distortion THD V

IN

= -40 dBV - 0.2 1 %

R

GT

= R

VC =

10 kΩ

Input Referred Noise IRN A Weighted Filter - - 2.5 µVRMS

VOLTAGE REGULATOR

Regulator Voltage V

REG

I

LOAD

= 30 µA 870 920 970 mVDC

Output Noise A Weighted Filter - 2.9 - µVRMS

STAGE A and STAGE B

Input Bias Current I

BIAS

R

VC

= R

GT =

1 MΩ -25 0 25 nA

DC Voltage Gain Stage A A

OL -A

38 52 - dB

Stage B A

OL -B

30 40 - dB

Current Source Capabilities I

SOURCE

15 30 - µA

Output Voltage Swing - Low V

SINK

200 280 - mV

STAGE C & CONTROL CIRCUIT

Maximum Current Sinking I

SINK

RE grounded, V

OUT

= 1.3 V 3 6 - mA

Output Impedance R

OUT

20 24 - kΩ

Minimum Emitter Voltage V

RE-MIN

25 9mV

Maximum Emitter Voltage V

RE-MAX

68 73 80 mV

Minimum Transducer Current I

T-MIN

22050µA

Maximum Transducer Current I

T-MAX

300 400 500 µA

Maximum/Minimum Transducer I

RANGE

15 28 - dB

Current Ratio
Dynamic Headroom Headroom Note 1 14 17 22 dB

Time Constant T

C

C

CC

= 0.22µF - 130 - mS

All parameters and switches remain as shown in the Test Circuit unless otherwise stated in CONDITIONS column.

PAD CONNECTION

CAUTION

CLASS 1 ESD SENSITIVITY

ABSOLUTE MAXIMUM RATINGS

PARAMETER VALUE / UNITS

Supply Voltage 5 VDC
Power Dissipation 25 mW
Operating Temperature Range -10° C to 40° C
Storage Temperature Range -20° C to 70° C

Conditions: Frequency = 5 kHz, Temperature 25 °C, Voltage Supply = 1.3 VDC

ELECTRICAL CHARACTERISTICS

Notes: 1. Headroom = 20 Log (V

RE DC

/ V

REACRMS

) [VIN

=

-79 dBV]

12

1110

9

8

7

6

5

4

3

2

1

B

OUT

GND

V

REG

IN BR

IN

B

IN

RE

A

OUT

A

IN

V

B

OUT

CC