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TDA1549T 데이터시트(Datasheet) 7 Page - NXP Semiconductors

부품명 TDA1549T
상세내용  Stereo 4fs data input up-sampling filter with bitstream continuous calibration DAC BCC-DAC1
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제조사  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
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 7 page
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August 1994
7
Philips Semiconductors
Objective specification
Stereo 4fs data input up-sampling filter with
bitstream continuous calibration DAC (BCC-DAC1)
TDA1549T
Continuous calibration DAC
The stereo 5-bit DAC uses the dynamic continuous
calibration technique. The DAC currents (16 sources and
16 sinks) of each channel are repeatedly generated from
one single reference current. This duplication is based on
an internal charge storage principle and has an inherently
high accuracy which is insensitive to ageing, temperature
and process variations.
Figure 4 shows one such current calibration source.
During calibration the cell is connected to the reference
current sink Iref via switch S2. The calibration transistor M1
is connected as an MOS diode via the switch S1 forcing its
gate potential to assume a value so that the total current of
the calibration cell is equal to the reference current. After
calibration the gate of M1 is allowed to float. The gate
capacitance Cgs retains its potential and the current
through the cell remains exactly equal to the reference
current. This current is now connected to the output. Each
digital-to-analog current source and each current sink is
calibrated precisely in this way.
Operational amplifiers
High precision, low-noise amplifiers together with the
internal conversion resistors RCONV1 and RCONV2 convert
the DAC output current to a voltage capable of driving a
line output. This voltage is available at VOL and VOR
(1.5 V RMS typical).
Connecting external capacitors CEXT1 and CEXT2 between
FILTCL and VOL and FILTCR and VOR respectively,
provides the required 1st-order post-filtering for the left
and right channels (see Fig.1). The combinations of
RCONV1 with CEXT1 and RCONV2 with CEXT2 determine the
1st order fall-off frequencies.
Internal reference circuitry
Internal reference circuitry ensures that the output voltage
signal is proportional to the supply voltage, thereby
maintaining maximum dynamic range for supply voltages
from 3.8 to 5.5 V and making the circuit also suitable for
battery-powered applications.
Fig.3 Filter and noise shaper characteristics.




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