參數(shù)資料
型號(hào)： UDA1324TS
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： DAC
英文描述： Ultra low-voltage stereo filter DAC
中文描述： SERIAL INPUT LOADING, 20-BIT DAC, PDSO16
封裝： 4.40 MM, PLASTIC, MO-152, SOT-369-1, SSOP-16
文件頁(yè)數(shù)： 5/20頁(yè)
文件大小： 107K
代理商： UDA1324TS
2000 Jan 20
5
Philips Semiconductors
Preliminary specification
Ultra low-voltage stereo filter DAC
UDA1324TS
In the L3 mode, pin APPL0 must be set to LOW. It should
be noted that when the L3 mode is used, an initialization
must be performed when the IC is powered-up.
Digital interface
D
ATA FORMATS
The digital interface of the UDA1324TS supports multiple
format inputs (see Fig.3).
Left and right data-channel words are time multiplexed.
The WS signal must have a 50% duty factor for all
LSB-justified formats.
The BCK clock can be up to 64f
s
, or in other words the
BCK frequency is 64 times the Word Select (WS)
frequency or less: f
BCK
≤
64
×
f
WS
.
Important
: the WS edge MUST fall on the negative edge
of the BCK at all times for proper operation of the digital
interface.
The UDA1324TS also accepts double speed data for
double speed data monitoring purposes.
L3
MODE
I
2
S-bus format 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.
S
TATIC PIN MODE
I
2
S-bus format with data word length of up to 20 bits
LSB-justified format with data word length of
16, 18 or 20 bits.
These four formats are selectable via the static pin codes
SF0 and SF1 (see Table 3).
Table 3
Input format selection using SF0 and SF1
Interpolation filter
The digital filter interpolates from 1f
s
to 128f
s
by cascading
a recursive filter and a FIR filter (see Table 4).
Table 4
Interpolation filter characteristics
Noise shaper
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 (FSDAC).
Filter stream DAC
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 capable of driving a line output.
The output voltage of the FSDAC scales linearly with the
power supply voltage.
FORMAT
SF0
SF1
I
2
S-bus
LSB-justified 16 bits
LSB-justified 18 bits
LSB-justified 20 bits
0
0
1
1
0
1
0
1
ITEM
CONDITION
VALUE (dB)
±
0.1
50
108
Pass-band ripple
Stop band
Dynamic range
0 to 0.45f
s
>0.55f
s
0 to 0.45f
s
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