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參數(shù)資料
| 型號： | UDA1340 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | Codec |
| 英文描述： | Low-voltage low-power stereo audio CODEC with DSP features |
| 中文描述： | 低電壓低功耗立體聲音頻編解碼器與數(shù)字信號處理功能 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 154K |
| 代理商： | UDA1340 |
1997 Jul 09
7
Philips Semiconductors
Preliminary specification
Low-voltage low-power stereo audio
CODEC with DSP features
UDA1340
Interpolation filter (DAC)
The digital filter interpolates from 1f
s
to 128f
s
by means of
a cascade of a recursive filter and an FIR filter.
Table 3
Interpolation filter characteristics
Noise shaper (DAC)
The 3rd-order noise shaper operates at 128f
s
. It shifts
in-band quantization noise to frequencies well above the
audio band. This noise shaping technique enables high
signal-to-noise ratios to be achieved. The noise shaper
output is converted into an analog signal using a filter
stream digital-to-analog converter.
ITEM
CONDITION
0
0.45f
s
>0.55f
s
0
0.45f
s
DC
VALUE (dB)
±
0.03
50
108
3.5
Passband ripple
Stop band
Dynamic range
Gain
The Filter Stream DAC (FSDAC)
The FSDAC is a semi-digital reconstruction filter that
converts the 1-bit data stream of the noise shaper to an
analog output voltage. The filter coefficients are
implemented as current sources and are summed at
virtual ground of the output operational amplifier. In this
way very high signal-to-noise performance and low clock
jitter sensitivity is achieved. A post-filter is not needed due
to the inherent filter function of the DAC. On-board
amplifiers convert the FSDAC output current to an output
voltage signal capable of driving a line output.
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