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参数资料
| 型号： | CS6403 |
| 厂商： | Cirrus Logic, Inc. |
| 元件分类： | Codec |
| 英文描述： | Echo-Cancelling Codec |
| 中文描述： | 回声取消编解码器 |
| 文件页数： | 27/54页 |
| 文件大小： | 761K |
| 代理商： | CS6403 |
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Increase Volume (110)
Setting GPIN2/1/0 to 110 for 375
μ
S will decre-
ment the volume increment counter by one step
causing an increase in the SPKROUT volume.
To increase volume again, the GPIN2/1/0 pins
must be changed to another state before return-
ing to 110. See section entitled "Volume
Control/ AGC" for more details.
Decrease Volume (101)
Setting GPIN2/1/0 to 101 for 375
μ
S will incre-
ment the volume increment counter by one step
causing an decrease in the SPKROUT volume.
To decrease volume again, the GPIN2/1/0 pins
must be changed to another state before return-
ing to 101. The section below entitled "Volume
Control/AGC" explains this function in greater
detail.
Don’t Care (010, 100)
When the GPIN2/1/0 pins are set to 010, or 100,
the CS6403 ignores the input. This state is pro-
vided in order to provide a "resting place"
between consecutive volume increase or volume
decrease requests.
Volume Control/AGC
The SPKROUT volume control of the CS6403 is
implemented in two stages: the upper ten volume
increments are implemented by a software peak-
limiting automatic gain control (AGC); the lower
32 volume increments are controlled by a hard-
ware DAC attenuation stage with software
compensation at the adaptive filter to avoid
changing the echo path. The volume increments
range from 0 (loudest) to 41 (quietest).
The AGC works by comparing the digital codes
coming from SDI to a threshold value, and if the
signal amplitude is greater than the threshold, it
is scaled down to the threshold. These signals
are subsequently scaled up so that the threshold
is full scale. The threshold value which is
roughly determined by the formula: Threshold =
Full Scale - (10 - Volume Increment)
x
3dB. For
example, a volume increment of 0 (the loudest
output volume possible) would force signals
greater than 30dB below full scale (10
x
3dB) to
30dB below full scale and then scale all signals
up 30dB so that 30dB below full scale becomes
full scale.
When the AGC is controlling the output volume,
the steps are effectively 3dB per volume incre-
ment. Note that if the signals are already strong,
increasing the volume may not make the sound
any louder since they are already being scaled up
to full scale. Also note that the AGC is effec-
tively disabled by setting the volume increment
to 10. The default volume increment (set upon
reset) is 4.
When the DAC attenuation stage is controlling
the output volume, the step size is 2.5dB per
volume increment. The 32 steps (from volume
increment 10 to 41) yield up to 77.5dB of addi-
tional attenuation.
Note that if the AGCD (SSI_CR1.10) is set in
Mode 2 (16-bit), then the DAC is attenuated by
10 dB (4
x
2.5 dB), and the effective volume
control range is from volume increment 0 to 31,
with each increment equal to 2.5 dB of attenu-
ation.
The volume increment defaults to 4 upon reset.
If an attempt is made to increase volume beyond
volume increment 0, the GPOUT0 pin will go
high for 125
μ
S. GPOUT0 will also go high if
an attempt is made to decrease volume beyond
volume increment 41.
CS6403
DS192PP6
27
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相关代理商/技术参数 |
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| CS6403-000 | 制造商:TE Connectivity 功能描述:High Performance Cable 制造商:TE Connectivity 功能描述:100A1111-22-0-0-CA |
| CS6403-IL | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:Echo-Cancelling Codec |
| CS6403-IQ | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:Echo-Cancelling Codec |
| CS640525 | 功能描述:DIODE MOD FST-REC SGL 500V 250A RoHS:否 类别:半导体模块 >> 二极管，整流器 系列:- 标准包装:10 系列:- 电压 - 在 If 时为正向 (Vf)（最大）:1.45V @ 30A 电流 - 在 Vr 时反向漏电:15µA @ 400V 电流 - 平均整流 (Io)（每个二极管）:30A 电压 - (Vr)（最大）:400V 反向恢复时间(trr):65ns 二极管类型:标准 速度:快速恢复 = 200mA（Io） 二极管配置:2 个独立式 安装类型:底座安装 封装/外壳:ISOTOP 供应商设备封装:ISOTOP? 包装:管件 |
| CS6405AM | 制造商:Cypress Semiconductor 功能描述: |
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