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参数资料
| 型号： | TMS57014ADWBLE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | DUAL, SERIAL INPUT LOADING, 18-BIT DAC, PDSO28 |
| 封装： | PLASTIC, SOIC-28 |
| 文件页数： | 16/17页 |
| 文件大小： | 250K |
| 代理商： | TMS57014ADWBLE |
TMS57014A
DUAL AUDIO DIGITAL-TO-ANALOG CONVERTER
SLAS077D – SEPTEMBER 1993 – REVISED NOVEMBER 1995
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Table 4. System-Register Bit Functions
BITS
FUNCTION
13
12
11–6
5
4
3–2
1
0
FUNCTION
0
—
MSB first, audio data
1
—
LSB first, audio data
—
0
—
16-bit, audio data
—
1
—
18-bit, audio data
—
0
—
Bits 11– 6 must be low
—
0
—
Zero data detect period (2500 cycles of Fs)
—
1
—
Zero data detect period (12500 cycles of Fs)
—
0
—
Bit 4 must be low
—
0
—
De-emphasis – 44.1 kHz
—
1
—
De-emphasis – 48.0 kHz
—
2
—
De-emphasis – 37.8 kHz
—
3
—
De-emphasis – 32.0 kHz
—
0
—
LRCK and PWM are not synchronized
—
1
—
LRCK and PWM synchronized
—
0
Bit 0 must be low
Default value = 0000h
interpolation filter
The interpolation filter used prior to the DAC increases the digital-data rate from the LRCK speed to the
oversampled rate by interpolating with a ratio of 1:32. The oversampling modulator receives the output of this
filter with de-emphasis as an option.
DAC modulator
The DAC is a third-order modulator with 32 times oversampling. The DAC provides high-resolution, low-noise
performance using a 15-value PWM output as shown in Figure 6.
fB§
0
0.1
0.2
0.3
0.4
0.5
0
Noise
Power
–
dB
Audio
Signal
Noise Excluded by
Low-Pass Filter
Quantization Noise Power With Noise Shaping
Quantization Noise Power Without Noise Shaping
Normalized Analog-Output Frequency (fO/Fs)
fO is the output frequency at the low-pass filter output (VO) shown in Figure 7.
APB(max)
§ fB is the highest frequency of interest within the baseband.
APB(max) is the passband maximum amplitude.
Figure 6. Oversampling Noise Power With and Without Noise Shaping
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