參數(shù)資料
型號： PCM9211PT
廠商： TEXAS INSTRUMENTS INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： DATACOM, TOKEN RING TRANSCEIVER, PQFP48
封裝： GREEN, PLASTIC, LQFP-48
文件頁數(shù)： 33/121頁
文件大?。?/td> 1219K
代理商： PCM9211PT
SystemClock
(SCK)
"L"
"H"
0.8V
2V
t
SCL
t
SCH
t
SCY
www.ti.com
SBAS495 – JUNE 2010
ADC Details
System Clock
The system clock for the ADC of the PCM9211 must be either 256fS or 512fS, where fS is the audio sampling rate
for the ADC (16 kHz to 96 kHz).
Table 3 lists the typical system clock frequencies fSCK for common audio sampling rates. Figure 13 shows the
timing requirements for the system clock inputs.
Table 3. ADC Clock Requirements
BIT CLOCK FREQUENCY
SYSTEM CLOCK FREQUENCY
SAMPLING FREQUENCY
64fS
256fS
512fS
16 kHz
1.024 MHz
4.0960 MHz
8.1920 MHz
32 kHz
2.048 MHz
8.1920 MHz
16.3840 MHz
44.1 kHz
2.8224 MHz
11.2896 MHz
22.5792 MHz
48 kHz
3.072 MHz
12.2880 MHz
24.5760 MHz
88.2 kHz
5.6448 MHz
22.5792 MHz
See (1)
96 kHz
6.144 MHz
24.5760 MHz
See (1)
(1)
This system clock frequency is not supported for the given sampling clock frequency
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
tSCY
System clock cycle time
30
ns
tSCH
System clock high time
0.4 tSCY
ns
tSCL
System clock low time
0.4 tSCY
ns
System clock duty cycle
40
60
%
Note:
This timing requirement is applied when ADC clock source (Register 42h/ADCLK) is AUXIN0, AUXIN1 or AUXIN2.
Figure 13. ADC System Clock Input Timing
Copyright 2010, Texas Instruments Incorporated
19
Product Folder Link(s): PCM9211
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