參數(shù)資料
型號(hào)： MSM7731-01
廠商： OKI SEMICONDUCTOR CO., LTD.
元件分類(lèi)： Codec
英文描述： Multifunction PCM CODEC (Voice Signal Processor)
中文描述： 多功能的PCM編解碼器（語(yǔ)音信號(hào)處理器）
文件頁(yè)數(shù)： 41/43頁(yè)
文件大?。?/td> 247K
代理商： MSM7731-01
41/43
Semiconductor
MSM7731-01
NOTES ON USE
1. Use a stabilized power supply with a low level of noises (especially spike noises and pulse
noises of high frequencies) in order to prevent this device from malfunction or degradation
in characteristics.
2. Place a good characteristics of bypass-capacitor for the power supply near the pins of this
device in order to assure its electrical characteristics.
3. Place a good characteristics of bypass-capacitor for the analog signal ground (SG pin) near
the pins of this device in order to assure its electrical characteristics.
4. Connect the AGND, DGND1 and DGND2 to the system ground at a shortest distance and
in a low impedance state.
5. Use a separate power supply for an external speaker amplifier so as not to be disturbed by
externally generated noises.
6. When an external speaker amplifier is used, do gain adjusting without overflow (saturation)
of speaker amplifier output.
The overflow of speaker amplifier output decreases the echo attenuation.
7. Set the analog signal input level to less than 1.3V
PP
to prevent overflow.
Otherwise, voice will be distorted.
8. Set the echo return loss (ERL) to be attenuated. If the echo return loss is to be amplified, the
GLPAD function should be used.
The ERL refers to echo attenuation (loss) between the echo canceler output (RoutA/RoutL)
and the echo canceler input (SinA/SinL).
Refer to Characteristics Diagram for the ERL vs. echo attenuation.
9. The input level should be –10 to –20dBm0.
Refer to Characteristics Diagram for the RIN input level vs. echo attenuation.
10.Adjust the volume at the position of the echo canceler input (RinA/RinL).
When in Dual Echo Canceler mode
: Adjust the volume with TPAD and RPAD.
When in Signal Echo Canceler mode : Adjust the volume with TPAD and RPAD, or
with the analog input (LIN) that is set at less
than 1.3V
PP
.
11.When the echo path is changed (when resuming telephone communication), reset the device
with the PDN/RST pin or the PDN/RST bit.
12.After turning on the power, be sure to reset the device with PDN/RST pin or the
PDN
/
RST
bit.
13.In order to get the highest performance of this device, the following functions should be
used.
AATT
/
LATT
: ON
AGC
/
LGC
: ON
SLPTHR
: Normal mode (slope filter operation)
NCTHR
: Normal mode (noise canceler operation)
RPAD6-1
: Adjusting the volume of receive signal.
TPAD6-1
: Adjusting the volume of transmit signal.
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