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參數(shù)資料
| 型號(hào)： | W9321 |
| 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： | MU-LAW, ADPCM CODEC, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 4/35頁(yè) |
| 文件大小： | 457K |
| 代理商： | W9321 |
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Preliminary W9321
- 4 -
4.1. Power Control Interface, continued
PIN NAME
PIN NO.
I/O
FUNCTION
VAG
4
O
This is the analog ground output pin which supplies a 2.5 volt
reference voltage for all analog signal processing. This pin should
be decoupled to V
SS
with 0.1
μ
F capacitor. This pin becomes high
impedance when the chip enters an analog power down mode.
C1+, C1-
23, 24
I
The charge pump capacitor pins. When V
EXT
= +5V
±
5%, these
capacitors C1+ and C1- should not be used and BR0[b2] must be
written into logic "1". When V
EXT
= 2.7 to 5.25 volt, a 0.1
μ
F
capacitor should be placed between C1+ and C1-.
PDI/RESET
13
I
The power down/reset input pin. When at logic 0, the chip enters a
power down mode. When it switches from logic 0 to logic 1, this
chip is active and resets the ADPCM transcoder and all circuits.
4.2. Analog Interface
PIN NAME
PIN NO.
I/O
FUNCTION
TG
1
O
This pin is the analog output of the transmit input amplifier. It can
be used to set the gain by external resistors. When the chip is in
analog power down mode, this pin is high impedance.
TI-
2
I
This pin is the inverting input of the transmit input amplifier.
Connecting this pin and TI+ (pin-3) to V
DD
will force TG into a
high impedance state.
TI+
3
I
The non-inverting input of the transmit input amplifier. Connecting
this pin and TI- (pin-2) to V
DD
will force TG to be high impedance.
Note this pin may be connected to the VAG pin for an inverting
configuration if the input signal is referenced to the VAG pin.
RO
5
O
This pin is the non-inverting analog output of the receive
smoothing filter. This pin can typically drive a 2 K
load to 1.13
volt peak referenced to the VAG pin. This pin may be dc
referenced to either the VAG pin or V
EXT
/2 determined by BR2
(b7). When the chip is in analog power down mode, this pin is
high impedance.
AXO-
6
O
This pin is the auxiliary inverting analog output. This pin can drive
a 300
load differentially. Its output can swing between 0.5 volt
and V
EXT
. This pin may be dc referenced to either the VAG pin or
V
EXT
/2 by BR2 (b7). When the chip is in analog power down
mode, this pin is high impedance.
AXO+
7
O
This pin is the auxiliary non-inverting analog output. This pin can
drive a 300
load differentially. Its output can swing between 0.5
volt and V
EXT
. This pin may be dc referenced to either the VAG
pin or V
EXT
/2 by BR2 (b7). When the chip is in analog power down
mode, this pin is high impedance.
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