200k
VB
4
REGULATOR
3
12
13
GB3215
13n
7
8
9
3k9
70nF
VC
A/D
GB3215 / GB3225
INTERFACE
EEPROM
(GB3225)
205n
A/D
CHANNEL 1
OUT
FRONTWAVE
CHANNEL 2
S
D/A
HBRIDGE
14
LP FILTER
1
70n
6
3k9
1k
A/D
CHANNEL 3
11
60n
10
5
2
All resistors in ohms, all capacitors in farads unless otherwise stated.
CHANNEL 4
Figure 1: Test Circuit
VC
200k
VB
MS
4
205n
7
6
8
70n
A/D
REGULATOR
3
INTERFACE
EEPROM
11
12
GA3214
(GA3224)
13n
VC
A/D
CHANNEL 1
S
D/A
HBRIDGE
13
1
Knowles or Microtronic
zero-bias receiver
CHANNEL 2
10
60n
A/D
9
5
2
All resistors in ohms, all capacitors in farads unless otherwise stated.
Knowles or Microtronic microphones
Figure 2: Typical Application Circuit
4 of 6
GENNUM CORPORATION
22735 - 3