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参数资料
| 型号： | CS6422-CS |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | Enhanced Full-Duplex Speakerphone IC |
| 中文描述： | SPEAKER PHONE CIRCUIT, PDSO20 |
| 封装： | 0.300 INCH, MS-013, SOIC-20 |
| 文件页数： | 11/48页 |
| 文件大小： | 873K |
| 代理商： | CS6422-CS |
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CS6422
11
of higher amplitude will clip the ADC input and
will result in poor echo canceller performance. See
Section 4.,
“
Design Considerations
”
for more de-
tails.
The outputs are delta-sigma digital to analog con-
verters (DACs) and have similar requirements to
the ADCs. The DACs are pre-compensated to ex-
pect a single-pole RC filter with a corner frequency
at 4 kHz. The full scale voltage output from a DAC
is 1.1 V
rms
(3.1 V
pp
) maximum, 1 V
rms
typical, bi-
ased around 2.12 VDC.
3.1.1
Acoustic Interface
The pins API (pin 20), APO (pin 18), AO (pin 3),
and MB (pin 19) form the Acoustic Interface. A
block diagram of the Acoustic Interface is shown in
Figure 6.
API and APO are, respectively, the input and out-
put of the built-in microphone pre-amplifier. The
pre-amplifier is an inverting amplifier with a fixed
gain of 34 dB biased around an input offset voltage
of 2.12 V. APO is the output of the pre-amplifier
after a 1 k
(typical) resistor. The circuitry con-
nected to the amplifier input must present low
source impedance (<100
) to the API pin or the
gain will be reduced. When using the internal mic
preamp, a 0.022
μ
F capacitor should be placed be-
tween APO and ground to provide the anti-aliasing
filter required by the ADC, as shown in Figure 4.
The pre-amplifier may be bypassed by clearing the
‘
Mic
’
bit (Register 0, bit 15) using the Microcontrol-
ler Interface (see Section 3.2,
“
Microcontroller Inter-
face
”
). If the internal mic preamp is not used, a
0.022
μ
F capacitor should be tied between API and
ground, and APO should be driven directly. In this
case, the signal into APO must be low-pass filtered
by a single-pole RC filter with a corner frequency at
8 kHz (see Figure 5).
Following the pre-amplifier is a programmable an-
alog gain stage, called TGain, which is controlled
MB
APO
20
AO
(0,6,9.5,12 dB)
ADC
DAC
DAC
ADC
D
S
P
NI
17
NO
4
FAR-END
Transmit Path
Receive Path
API
1k
Voltage
Reference
34 dB
(0,6,9.5,12 dB)
NEAR-END
3
TGain
RGain
CS6422
Mic
19
18
Figure 6. Analog Interface
DS295F1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS6422-CSZ | 功能描述:音频放大器 Enhanced Full-Duplex Speakerphone IC RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:ICTelephone Speech CircuitSOP20PINPL |
| CS6422-CSZ | 制造商:Cirrus Logic 功能描述:IC TELEPHONE SPEECH CIRCUIT 20SOP |
| CS6422-CSZ/A | 功能描述:IC SPEAKERPHONE ENHANCED 20SOIC 制造商:cirrus logic inc. 系列:* 零件状态:过期 标准包装:37 |
| CS6422-CSZR | 功能描述:电信集成电路 IC Enhanced Full-Duplx Spkrphone RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
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