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參數(shù)資料
| 型號(hào)： | W9320 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 編解碼器 |
| 英文描述： | ADPCM Codec(ADPCM編解碼器) |
| 中文描述： | A/MU-LAW, ADPCM CODEC |
| 文件頁數(shù)： | 30/35頁 |
| 文件大小： | 444K |
| 代理商： | W9320 |
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W9320
- 30 -
10. APPLICATION INFORMATION
10.1. Handset Application for Wireless Communication
For wireless handset applications, V
EXT
is supplied from a 2.7 to 5.25 volt battery power supply.
Meanwhile the V
DD
pin, connected with a 1.0
μ
F capacitor to ground, is a 5 volt output and should not
be connected to V
EXT
. The V
DSP
pin, connected with a 0.1
μ
F capacitor to ground, is a 3 volt output.
The V
DD
and V
DSP
pins should not be used to supply any external systems. The chip must also
enable the charge pump by clearing the BR0[b2] of SSP port.
The output power amplifier pins PO- and PO+ drive the receiver speaker. A ringer is driven by the
differential power amplifier outputs AXO- and AXO+. The input to the transmitter amplifier is from a
microphone output.
The application circuit, Figure 10-1 is as follows.
TG
TI-
TI+
VAG
RO
AXO-
AXO+
VDSP
VEXT
PI
PO-
PO+
PDI/RESET
SSP En
VDD
FSR
BCLKR
DR
C1+
C1-
Vss
MCLK (SCP)
DT
BCLKT
FST
SSP Rx
SSP Tx
SSP CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Battery Power
Ringer
Speaker
Microphone
Receiver
Speaker
Battery Power
0.1 uF
8 KHz Frame Sync. Input
2048 KHz Data Rate
ADPCM Data Output
System Clock= 10.24/16.384 MHz
ADPCM Data Input
Micro-Controller
ADPCM Chip
150
150
1 K
1 K
1.0 uF
1K
1K
20 K
20 K
20 K
3 K
0.1 uF
0.1 uF
0.1 uF
1.0 uF
1.0 uF
Figure 10-1 Typical Handset Application
10.2. Transformer Application for Public Switching Telephone Network (PSTN)
For this application, V
EXT
= +5V
±
5%, V
DD
is an input and should be connected to V
EXT
externally.
The charge pump capacitor C1+ and C1- should not
be used and the device must disable
the charge
pump circuit by setting BR0[b2]. Here V
EXT
and V
DD
can share the same 0.1
μ
F capacitor.
The transmitter TI-, TI+ and the receiver PO-, PO+ are connected to the secondary terminal of the
telephone line transformer.
The application circuit, Figure 10-2 is as follows.
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