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TDA1305T View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TDA1305T Datasheet PDF : 20 Pages
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Philips Semiconductors
Stereo 1fs data input up-sampling filter with
bitstream continuous dual DAC (BCC-DAC2)
Preliminary specification
TDA1305T
FUNCTIONAL DESCRIPTION
The TDA1305T CMOS digital-to-analog bitstream
converter incorporates an up-sampling filter and noise
shaper which increase the oversampling rate of 1fs input
data to 96fs (fsys = 192fs) or 128fs (fsys = 256fs) in the
normal speed mode. In the double speed mode the
oversample rate of 1fs input data is increased to 48fs
(fsys = 384fs) or 64fs (fsys = 256fs). This oversampling,
together with the 5-bit DAC, enables the filtering required
for waveform smoothing and out-of-band noise reduction
to be achieved by simple 1st order analog post filtering.
System clock and data input format
The TDA1305T accommodates slave mode only, this
means that in all applications the system devices must
provide a system clock of 256 or 384fs (fs = 32, 44.1 or
48 kHz). The system frequency is selectable by means of
pin CLKS1 and pin CLKS2. The SYSCLKO output (pin 16)
provides the system clock for external use.
The TDA1305T supports the following data input modes:
I2S-bus with data word lengths of up to 20 bits
(at fsys = 256fs).
LSB fixed serial format with data word lengths of 16, 18
and 20 bits (at fsys = 384fs). As this format idles on the
MSB it is necessary to know how many bits are being
transmitted.
The input format is shown in Fig.3. Left and right
data-channel words are time-multiplexed.
Table 1 Data input format and system clock.
TEST1 CLKS1 CLKS2 DATA INPUT FORMAT
0
0
0
I2S up to 20 bits
0
0
1
LSB fixed 16 bits
0
1
0
LSB fixed 18 bits
0
1
1
LSB fixed 20 bits
1
0
0
reserved
1
0
1
LSB fixed 16 bits
1
1
0
LSB fixed 18 bits
1
1
1
LSB fixed 20 bits
Note
1. Number of clock pulses within half an audio sample.
SYSTEM
CLOCK
256fs
384fs
384fs
384fs
384fs
384fs
384fs
DATA
CLOCK(1)
>20
24
24
24
32
32
32
SYSCLKO
256fs
384fs
384fs
384fs
384fs
384fs
384fs
1995 Dec 08
6
 

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