GENNUM CORPORATION

22735 - 3

4 of 6

Figure 1: Test Circuit

Figure 2: Typical Application Circuit

3k9

3k9

1k

LP FILTER

OUT

VB

INTERFACE

VC

A/D

FRONTWAVE

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

EEPROM

REGULATOR

GB3215

A/D

A/D

D/A

HBRIDGE

205n

60n

13n

70n

70nF

200k

S

5

10

6

9

8

7

11

4

3

12

13

14

1

2

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

(GB3225)

VB

VC

MS

200k

GA3214

INTERFACE

VC

A/D

CHANNEL 1

CHANNEL 2

EEPROM

S

REGULATOR

A/D

A/D

D/A

HBRIDGE

205n

60n

13n

70n

2

1

13

12

11

3

4

7

6

8

10

9

5

Knowles or Microtronic

zero-bias receiver

(GA3224)

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

Knowles or Microtronic microphones