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TDA1549T Datenblatt(PDF) 6 Page - NXP Semiconductors

Teilenummer TDA1549T
Bauteilbeschribung  Stereo 4fs data input up-sampling filter with bitstream continuous calibration DAC BCC-DAC1
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
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TDA1549T Datenblatt(HTML) 6 Page - NXP Semiconductors

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August 1994
6
Philips Semiconductors
Objective specification
Stereo 4fs data input up-sampling filter with
bitstream continuous calibration DAC (BCC-DAC1)
TDA1549T
FUNCTIONAL DESCRIPTION
General
The TDA1549T CMOS digital-to-analog bitstream
continuous calibration converter incorporates internal
digital filtering which increases the oversampling rate of 4fs
input data to 96fs, and removes the spectral data
components around 4fs, 8fs, and 12fs. A 2nd order noise
shaper operating at 96fs outputs a 5-bit data bitstream to
the DACs. The filtering required for waveform smoothing
and out-of-band noise reduction is achieved by simple 1st
order analog post-filtering (see Fig.3).
The combination of noise shaping and bitstream
continuous calibration digital-to-analog conversion
enables high performance and extremely low noise to be
achieved.
Input
The circuit accepts four times oversampled data in 18-bit
two's complement standard Japanese format with MSB
first. Left and right data channel words are time
multiplexed. The input format is illustrated in Fig.5. The bit
clock (BCK) operates at 192fs, i.e. 48 times the word select
(WS) frequency of 4fs.
Oversampling filter
The oversampling filter consists of:
• A 7th order half-band low-pass FIR filter which
increases the oversampling rate from 4 times to 8 times.
This removes the spectral components around 4fs and
12fs (see Fig.3).
• A linear interpolation section which increases the
oversampling rate to 16 times. This removes the
spectral components around 8fs.
• A sample-and-hold section which provides another
6 times oversampling to 96 times.
The zero-order hold characteristic of this sample-and-hold
section plus the 1st order analog filtering removes the
spectral components around 16fs.
Passband ripple is within 0.1 dB. Stopband attenuation is
>50 dB around multiples of the sampling frequency.
Noise Shaper
The 2nd-order digital noise shaper converts the 18-bit data
at 96fs into a 5-bit bitstream, while shifting in-band
quantization noise to frequencies well above the audio
band. For low signal levels the noise shaper output is a
1-bit bitstream. This noise shaping technique used in
combination with a special data code and bitstream DAC
enables extremely high signal-to-noise ratios to be
achieved.
Data encoder
The data encoder converts the 5-bit two's complement
output data from the noise shaper to a 32-bit thermometer
code.
In traditional unidirectional current converters, half of the
full-scale current flows to the output during small signal
reproduction. The thermal noise and substrate crosstalk
components present in this current severely restrict the
dynamic range which can be attained. In this BCC-DAC1
true low-noise performance is achieved using a special
data code and bidirectional current sources. The special
data code guarantees that only small values of current flow
to the output during small-signal passages while larger
positive or negative signals are generated using the
bidirectional current sources. For every change in the
18-bit input sample only one current source or current sink
is switched on. This intrinsically monotonic thermometer
code ensures the high differential linearity, zero crossover
distortion and superior signal-to-noise ratio associated
with bitstream conversion.


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