Philips CD721 - Page 31

4. Stereo continuous calibration DAC TDA1545
4,1. General description
The TDA1545 is the first device of a new generation of This duplication is based upon an internal charge storage
digital-to-analog converters which embodies the innovati- principle having an accuracy insentive to ageing, tempe-
ve technique of continuous calibration. The largest bit- rature and process variations.
currents are repeatedly generated by one single current
reference source.
4.2. Block diagram
4.3. Pin description
TDA1545
INPUT/OUTPUT REGISTER
LEFT
LEFT BIT SWITCHES
f\ f
32 (S-BIT) CALIBRATED
CONTROL
11-BIT
PASSIVE
|_
CURRENT
SOURCES
DIVIDER 1 CALIBRATED
SPARE SOURCE REFERENCE
V V
RIGHT BIT SWITCHES
AND
TIMIN 11-BIT PASSIVE a SPARE SOURCE
DIVIDER 32 (S-BIT) CALIBRATED
CURRENT SOURCES
V
INPUT/OUTPUT REGISTER
RIGHT
HAS1154
bit clock input
word select input
PCS 60 964
a
data input