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參數(shù)資料
| 型號： | MSM7728 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分類： | Codec |
| 英文描述： | Single Rail Linear CODEC |
| 中文描述： | 單軌線性編解碼器 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大小： | 150K |
| 代理商： | MSM7728 |
Semiconductor
MSM7728
4/23
PIN AND FUNCTIONAL DESCRIPTIONS
V
DD
Power supply pin for 2.5 to 3.6 V (Typically 3.0 V).
AG
Analog signal ground.
DG
Ground pin for the digital signal circuits.
This ground is separated from the analog signal ground in this device. The DG pin must be
connected to the AG pin on the printed circuit board.
SGC
Bypass capacitor pin for generating the signal ground voltage level.
Insert a 0.1
m
F capacitor with excellent high frequency characteristics between the AG pin and
the SGC pin.
MAIN, MAO
Transmit microphone input and level adjustment.
MAIN is connected to the inverting input of the op-amp, and MAO is connected to the output
of the op-amp. This amplifier can set up a gain to a maximum of 36dB by using an external
resistor.
Level adjustment should be performed in a way below.
A transmit level of +6, 0, –6, or –12dB can be selected using control data from the processor
interface.
When CODEC is turned off, the MAO output goes high impedance.
–
+
MAIN
C1
Microphone input
R1 : variable
R2 > 20 k
W
C1 > 1/(2
￥
3.14
￥
30
￥
R1) (F)
Gain = R2/R1 <
63
R2
MAO
R1
SG
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