GA3219 / GA3218 / GA3217 Preliminary Data Sheet
VB
5
4
TONE
GENERATOR
6
POR
CIRCUITRY
7
1
VOLTAGE
REGULATOR
MEMORY
SELECT
POST
BIQUAD
FILTERS
CROSS
FADER
PEAK
CLIPPER
D/A
HBRIDGE
8
9
Knowles or Sonion
zero-bias receiver
15
14
2
3
M
U
X
A/D
A/D
MIC/TELECOIL
COMPENSATION
F
R
O
N
T
W
A
V
E
PRE
BIQUAD
FILTERS
FEEDBACK
CANCELLER
AGCO
VOLUME
CONTROL
POST
BIQUAD
FILTERS
CONTROL
A/D
WIDEBAND
GAIN
10
13
16
FREQUENCY
BAND
ANALYSIS
12
PROGRAMMING
INTERFACE
128 bands
FREQUENCY
BAND
SYNTHESIS
WDRC (1,2,4 channels)
Noise Reduction (128 bands)
CLOCK
GENERATOR
Graphic EQ (8 bands)
EEPROM
11
Figure 4-2: Typical Application Circuit
VC
CS44
+
Rear
Mic
Zero Biased
Receiver
+
Front
Mic
MS
switch
(N.O.)
T-coil
Figure 4-3: Typical Hearing Instrument Assembly Diagram
Proprietary and Confidential
32718 - 2
February 2005
8 of 24
+
-
GENNUM [ GENNUM CORPORATION ]
