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參數(shù)資料
| 型號(hào)： | PCM1870RHFT |
| 英文描述： | 16-Bit Low-Power Stereo Audio ADC With Microphone Bias and Microphone Amplifier |
| 中文描述： | 16位低功耗立體聲音頻ADC，具有麥克風(fēng)偏置和麥克風(fēng)放大器 |
| 文件頁數(shù)： | 44/49頁 |
| 文件大?。?/td> | 648K |
| 代理商： | PCM1870RHFT |
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BOARD DESIGN AND LAYOUT CONSIDERATIONS
V
CC
, V
DD
, and V
IO
Pins
The digital and analog power supply lines to the PCM1870 should be bypassed to the corresponding ground
pins with 0.1- to 4.7-
μ
F ceramic capacitors or electrolytic capacitors, placed as close to the pins as possible to
maximize the dynamic performance of ADC.
AGND and DGND Pins
AIN1L, AIN1R, AIN2L, and AIN2R Pins
AOL, AOR, PGINL, and PGINR Pins
V
COM
Pin
1-
μ
F to 4.7-
μ
F capacitor is recommended between V
and AGND to ensure low source impedance for the
ADC common voltage. This capacitor should be located as close as possible to the V
COM
pin to reduce dynamic
errors on the ADC common voltage.
BCK (Master Mode) and DOUT Pins
PCM1870
SLAS544–MAY 2007
To maximize the dynamic performance of the PCM1870, the analog and digital grounds are not connected
internally. These grounds should have very low impedance to avoid digital noise feeding back into the analog
ground. So, they should be connected directly to each other under the part to reduce the potential of noise
problems.
AIN1L, AIN1R, AIN2L, and AIN2R are single-ended inputs. AIN1L and AIN1R can also be used as a monaural
differential input. The anti-aliasing low-pass filters are integrated on these inputs to remove the out-of-band noise
from the audio. If the performance of these filters is not good enough for an application, appropriate external
anti-aliasing filters are needed. The passive RC filter (100
and 0.01
μ
F to 1 k
and 1000 pF) is used in
general. Any pins that are not used in an application should be left open. Do not select open pins through
register settings.
When AIN1L, AIN1R, AIN2L, and AIN2R pins are used as microphone inputs with high gain, AOL and AOR may
have a large dc offset. It is recommended to locate a dc-blocking capacitor (1- to 10-
μ
F capacitor) between
AOL/AOR and PGINL/PGINR. If an application is not affected by dc offset, the PCM1870 does not need the
capacitors.
BCK in the master mode and DOUT have adequate load drive capability, but if the BCK and DOUT lines are
long, locating a buffer near the PCM1870 and minimizing load capacitance is recommended in order to minimize
crosstalk between digital and analog circuits, maximize the dynamic performance of the ADC, and reduce power
consumption.
44
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