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參數(shù)資料
| 型號： | PCM4202 |
| 英文描述： | High-Performance 24-Bit, 216kHz Sampling Stereo Audio Analog-to-Digital Converter |
| 中文描述： | 高性能24位，216kHz的采樣立體聲音頻模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 342K |
| 代理商： | PCM4202 |
SBAS290B JULY 2003 SEPTEMBER 2004
www.ti.com
20
POWER-DOWN OPERATION
The PCM4202 can be forced to a power-down state by
applying a low level to the RST input (pin 19) for a minimum
of 65,536 system clock cycles. In power-down mode, all
internal clocks are stopped, and output data pins are
forced low. The system clock may then be removed to
conserve additional power. Before exiting power-down
mode, the system and audio clocks should be restarted.
Once the clocks are active, the RST input may be driven
high, which initiates a reset initialization sequence.
Figure 11 illustrates the state of the output data pins during
before, during, and upon exiting the power-down state.
APPLICATIONS INFORMATION
A typical connection diagram for the PCM4202 is shown
in Figure 12. Capacitors for power supply and reference
bypassing are shown with recommended values. Bypass
capacitors should be located as close as possible to the
power supply and reference pins of the PCM4202. Due to
its small size, the 0.1
μ
F capacitor can be located on the
component (top) side of the board, while the larger 33
μ
F
capacitor can be located on the solder (bottom) side of the
board.
A single ground plane is utilized for the analog and digital
ground connections. This approach ensures a low
impedance connection between the analog and digital
ground pins. The +5V analog and +3.3V digital power
connections are provided from separate supplies.
Figure 13 illustrates an example input buffer circuit,
designed for balanced differential input signals. This circuit
is utilized on the PCM4202EVM evaluation board. The
2.7nF and 100pF capacitors shown at the output of the
buffer should be located as close as possible to the analog
input pins of the PCM4202. The buffer shown in Figure 13
can be easily made to function as a single ended to
differential converter by simply grounding the () input
terminal of the buffer circuit.
The input impedance for the V
COM
IN pin of the OPA1632
is relatively low and will load down the V
COM
L or V
COM
R
outputs from the PCM4202. A voltage follower circuit is
required to buffer these outputs, with a typical circuit
configuration shown in Figure 14. An OPA227 is utilized as
the buffer for the PCM4202EVM evaluation board.
However, alternative op amps with comparable
performance may be substituted.
Output
Data Pins
65,536
SCKI Periods
Valid Output Data
Outputs are
Forced Low
RST
LO
HI
1024
SCKI Periods
Required for
Initialization
Valid Output Data
Outputs are
Forced Low
Outputs are
Forced Low
Enter
PowerDown
State
Figure 11. ADC Digital Output State for Power-Down Operations
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|---|---|
| PCM4202DB | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit/192kHz 118dB Stereo Audio A/D RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM4202DBG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit/192kHz 118dB Stereo Audio A/D RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM4202DBR | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit/192kHz 118dB Stereo Audio A/D RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM4202DBRG4 | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit/192kHz 118dB Stereo Audio A/D RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
| PCM4202DBT | 功能描述:音頻模/數(shù)轉(zhuǎn)換器 IC 24-Bit/192kHz 118dB Stereo Audio A/D RoHS:否 制造商:Wolfson Microelectronics 轉(zhuǎn)換速率: 分辨率: ADC 輸入端數(shù)量: 工作電源電壓: 最大工作溫度: 最小工作溫度: 安裝風格: 封裝 / 箱體: 封裝: |
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