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參數資料
| 型號： | 935261242112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 20-BIT DAC, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, SSOP-16 |
| 文件頁數： | 18/21頁 |
| 文件大小： | 142K |
| 代理商： | 935261242112 |
2000 Jan 10
6
Philips Semiconductors
Preliminary specication
Low-cost stereo lter DAC
UDA1320ATS
8.3
Multiple format input interface
L3 mode:
I2S-bus with data word length of up to 20 bits
MSB-justified format with data word length up to 20 bits
LSB-justified format with data word length of 16,
18 or 20 bits.
8.4
Static pin mode
The UDA1320ATS/N2 supports the following data input
name formats in the static pin mode (via SF0 and SF1):
I2S bus with data word length of up to 20 bits
LSB-justified format with data word length of 16,
18 or 20 bits.
See Table 2, for the static pin codes of the 4 formats,
selectable via SF0 and SF1.
The UDA1320ATS/N2 also accepts double speed data for
double speed data monitoring purposes.
Table 2
Input format selection using SF0 and SF1
The formats are illustrated in Fig.3. Left and right
data-channel words are time multiplexed. The WS signal
must have 50% duty-factor for all LSB-justified modes.
For BCK and WS holds that the BCK frequency must be
equal or smaller then 64 times WS, or fBCK =< 64*fWS in
both L3 and static mode.
8.5
Pin compatibility
In L3 interface mode the UDA1320ATS/N2 can be used on
boards that are designed for the UDA1322. The software
for UDA1322 can be used for the UDA1320ATS/N2 to
control de-emphasis, volume control and mute and also
the status settings like system clock setting and input data
format.
IMPORTANT: UDA1320ATS/N2 differs from the
UDA1320TZ/N1 with respect to:
in the static mode 384fs is supported instead of 512fs.
the output voltage of the DAC. In the UDA1320TZ/N1
this is 800mVrms at 3.0V, now it is 1Vrms at 3.3V power
supply
8.6
Interpolation lter (DAC)
The digital filter interpolates from 1 to 128fs by cascading
a recursive filter and a FIR filter, see Table 3.
Table 3
Interpolation lter characteristics
8.7
Noise shaper
The 3rd-order noise shaper operates at 128fs. 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 DAC (FSDAC).
8.8
Filter-Stream DAC
The FSDAC is a semi-digital reconstruction filter that
converts the 1-bit data stream of the noise shaper to be
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.
The output voltage of the FSDAC scales linearly with the
power supply voltage.
FORMAT
SF0
SF1
I2S0
0
LSB-justied 16 bits
0
1
LSB-justied 18 bits
1
0
LSB-justied 20 bits
1
ITEM
CONDITION
VALUE (dB)
Pass-band ripple
0 to 0.45fs
±0.1
Stop band
>0.55fs
50
Dynamic range
0 to 0.45fs
108
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