參數(shù)資料
型號(hào): PCM9211PT
廠商: TEXAS INSTRUMENTS INC
元件分類(lèi): 網(wǎng)絡(luò)接口
英文描述: DATACOM, TOKEN RING TRANSCEIVER, PQFP48
封裝: GREEN, PLASTIC, LQFP-48
文件頁(yè)數(shù): 52/121頁(yè)
文件大?。?/td> 1219K
代理商: PCM9211PT
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ADC
DIT
000
001
010
011
100
101
110
111
AudioPort
SamplingFrequency
Calculator
PFSTGT[2:0]
DIR(default)
AUXIN0
AUXIN1
AUXIN2
MainOutputPort
AUXOutputPort
SBAS495 – JUNE 2010
www.ti.com
DIR: Audio Port Sampling Frequency Calculator
The second sampling frequency calculator can be used to calculate the sampling frequency of DIR, ADC,
AUXIN0, AUXIN1, AUXIN2, Main Output Port, AUX Output Port, and DIT Input. Figure 29 illustrates the sampling
frequency calculator sources.
Figure 29. Sampling Frequency Calculator Sources
The calculated sampling frequency fS is decoded to 4-bit data and stored in the PFSOUT[3:0] register. The input
source of this counter is selectable from AUXIN0, AUXIN1, AUXIN2, DIR, ADC, Main Output Port, AUX Output
Port, and DIT by using the Register 37h/PFSTGT[3:0].
To use this function, a 24.576-MHz clock source must be supplied to the XTI pin. The 24.576-MHz clock is used
as a reference clock. If the XTI pin is connected to DGND, the calculation is not performed. If there is an error in
the XTI clock frequency, the calculation result and range will be incorrect.
Register 38h/PFSST indicates the calculator status. It is recommended that PFSST is checked (for complete
status) before reading PFSOUT[3:0].
36
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): PCM9211
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