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參數(shù)資料
| 型號： | TLV320AIC22PTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | ROHS COMPLIANT, PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 22/55頁 |
| 文件大?。?/td> | 782K |
| 代理商： | TLV320AIC22PTR |
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TLV320AIC22
DUAL VOIP CODEC
SLAS281B – JULY 2000 – REVISED JUNE 2002
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
sampling rate mode 2 (continued)
Table 8. I, N, and D Derivation for 32.768-MHz Clock and 12-kHz Sampling Rate
PARAMETER OR VARIABLE
EQUATION
VALUE
MCLK
None
32.768 MHz (given)
BCLK
MCLK/2
16.384 MHz
FSYNC
BCLK/256
64 kHz
Sample rate
MCLK/[512 x (I + N/D)]
12 kHz (given)
I + N/D
MCLK/(512 x sample rate)
5.3333
I
5
N
3
D
9
The binary equivalent of the following values are loaded into the respective registers for a 12-kHz channel
sampling rate: I = 5 (I – 1 = 4), N = 3 and D = 9 (D – 1 = 8).
Table 7 shows the corresponding values for I, N, and D for some of the popular sampling rates, with
MCLK = 32.768 MHz. Note, that the value of D always should be a nonzero value. When programming the
TLV320AIC22, the values of I and D are decremented by one and the N value is entered without any change.
The values to be programmed also are shown in Table 9.
Table 9. I, N, and D Derivation for Various Sample Rates, With MCLK = 32.768 MHz
I, N, AND D VALUES FOR CHANNEL SAMPLE RATES, WITH
MCLK = 32.768 MHz
ACTUAL VALUES TO BE
PROGRAMMED IN REGISTERS 1, 2, 6,
AND 7
Channel sample rate (kHz)
I + N/D
I
N
D
I–1
N
D–1
7.2
8.8889
8
9
7
8
8.0000
8
0
9
7
0
8
8.229
7.7774
7
9
6
7
8
9.6
6.6667
6
9
5
6
8
10.285
6.2227
6
2
9
5
2
8
12
5.3333
5
3
9
4
3
8
14.4
4.4444
4
9
3
4
8
16
4.0000
4
0
9
3
0
8
It is possible to use other frequencies for MCLK and achieve the above channel sample rates. For example,
using an MCLK frequency of 24.576 MHz, the following occurs:
BCLK = MCLK/2 = 12.288 MHz
FSYNC = BCLK/256 = 48 kHz
Channel sample rate = MCLK/ [512 x (I + N/D)] = 48 kHz/(I + N/D)
Therefore, (I + N/D) = 48 kHz/channel sample rate
Table 10 shows the corresponding values for I, N, and D for some of the popular sampling rates, with MCLK
equal to 24.576 MHz. Again, note that the value of D should always be a nonzero value. As discussed earlier,
the values that the TLV320AIC22 are actually programmed with are I–1, N, and D–1.
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