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參數資料
| 型號： | TLV320DAC26IRHB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, DAC WITH PROGRAMMABLE PLL, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數： | 9/52頁 |
| 文件大小： | 872K |
| 代理商： | TLV320DAC26IRHB |
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TLV320DAC26
SLAS428 AUGUST 2004
www.ti.com
17
D When PLL is enabled and D = 0, the following condition must be satisfied
80 MHz
v MCLK
K
P
v 110 MHz
2MHz
v MCLK
P
v 20 MHz
4
v J v 55
D When PLL is enabled and D ≠ 0, the following condition must be satisfied
80 MHz
v MCLK
K
P
v 110 MHz
10 MHz
v MCLK
P
v 20 MHz
4
v J v 11
Example 1:
For MCLK = 12 MHz and Fsref = 44.1 kHz
P = 1, K = 7.5264
J = 7, D = 5264
Example 2:
For MCLK = 12 MHz and Fsref = 48.0 kHz
P = 1, K = 8.192
J = 8, D = 1920
STEREO AUDIO DAC
Each channel of the stereo audio DAC consists of a digital audio processing block, a digital interpolation filter, digital
delta-sigma modulator, and an analog reconstruction filter. The DAC is designed to provide enhanced performance at low
sample rates through increased oversampling and image filtering, thereby keeping quantization noise generated within the
delta-sigma modulator and signal images strongly suppressed within the audio band to beyond 20 kHz. This is realized
by keeping the upsampled rate constant at 128 x Fsref and changing the oversampling ratio as the input sample rate is
changed. For Fsref of 48 kHz, the digital delta-sigma modulator always operates at a rate of 6.144 MHz. This ensures that
quantization noise generated within the delta-sigma modulator stays low within the frequency band below 20 kHz at all
sample rates. Similarly, for Fsref rate of 44.1 kHz, the digital delta-sigma modulator always operates at a rate of 5.6448
MHz.
Digital Audio Processing
The DAC channel consists of optional filters for de-emphasis and bass, treble, midrange level adjustment, or speaker
equalization. The de-emphasis function is only available for sample rates of 32 kHz, 44.1 kHz, and 48 kHz. The transfer
function consists of a pole with time constant of 50
s and a zero with time constant of 15 s. Frequency response plots
are given in the Audio DAC Filter Frequency Responses section of this data sheet. The de-emphasis filter can be enabled
or bypassed depending on bit D0 of register 05H/Page2.
The DAC digital effects processing block also includes a fourth order digital IIR filter with programmable coefficients (one
set per channel). The filter is implemented as cascade of two biquad sections with frequency response given by:
N0
) 2
N1
z*1
) N2
z*2
32768
* 2
D1
z*1
* D2
z*2
N3
) 2
N4
z*1
) N5
z*2
32768
* 2
D4
z*1
* D5
z*2
The N and D coefficients are fully programmable, and the entire filter can be enabled or bypassed depending on bit D1 of
register 05H/Page2. The coefficients for this filter implement a variety of sound effects, with bass-boost or treble boost being
the most commonly used in portable audio applications. The default N and D coefficients in the part are given by:
N0 = N3 = 27619
D1 = D4 = 32131
N1 = N4 = 27034
D2 = D5 = 31506
N2 = N5 = 26461
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