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參數(shù)資料
| 型號： | TLV320AIC23BIPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 19/41頁 |
| 文件大小： | 260K |
| 代理商： | TLV320AIC23BIPWRQ1 |
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39
3.3.2
Audio Sampling Rates
The TLV320AIC23B can operate in master or slave clock mode. In the master mode, the TLV320AIC23B clock and
sampling rates are derived from a 12-MHz MCLK signal. This 12-MHz clock signal is compatible with the USB
specification. The TLV320AIC23B can be used directly in a USB system.
In the slave mode, an appropriate MCLK or crystal frequency and the sample rate control register settings control
the TLV320AIC23B clock and sampling rates.
The settings in the sample rate control register control the clock mode and sampling rates.
Sample Rate Control (Address: 0001000)
BIT
D8
D7
D6
D5
D4
D3
D2
D1
D0
Function
X
CLKOUT
CLKIN
SR3
SR2
SR1
SR0
BOSR
USB/Nor-
mal
Default
0
1
0
CLKOUT
Clock output divider
0 = MCLK
1 = MCLK/2
CLKIN
Clock input divider
0 = MCLK
1 = MCLK/2
SR[3:0]
Sampling rate control (see Sections 3.3.2.1 and 3.3.2.2)
BOSR
Base oversampling rate
USB mode:
0 = 250 fs
1 = 272 fs
Normal mode:
0 = 256 fs
1 = 384 fs
USB/Normal
Clock mode select:
0 = Normal
1 = USB
X
Reserved
The clock circuit of the AIC23B has two internal dividers. The first, controlled by CLKIN, applies to the sampling-rate
generator of the codec. The second, controlled by CLKOUT, applies only to the CLKOUT terminal. By setting CLKIN
to 1, the entire codec is clocked with half the frequency, effectively dividing the resulting sampling rates by two. The
following sampling-rate tables are based on CLKIN = MCLK.
3.3.2.1 USB-Mode Sampling Rates (MCLK = 12 MHz)
In the USB mode, the following ADC and DAC sampling rates are available:
SAMPLING RATE
SAMPLING-RATE CONTROL SETTINGS
ADC
DAC
FILTER TYPE
SAMPLING-RATE CONTROL SETTINGS
ADC
(kHz)
DAC
(kHz)
FILTER TYPE
SR3
SR2
SR1
SR0
BOSR
96
3
0
1
0
88.2
2
1
48
0
44.1
1
0
1
32
0
1
0
8.021
1
0
1
8
0
1
0
48
8
0
1
0
44.1
8.021
1
0
1
8
48
0
1
0
8.021
44.1
1
0
1
0
1
The sampling rates are derived from the 12-MHz master clock. The available oversampling rates do not produce exactly 8-kHz, 44.1-kHz, and
88.2-kHz sampling rates, but 8.021 kHz, 44.117 kHz, and 88.235 kHz, respectively. See Figures 317 through 334 for filter responses
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