1997 Sep 04
2
Philips Semiconductors
Preliminary specification
Stereo continuous calibration DAC
TDA1545A
FEATURES
Space saving packages
Low power consumption
Low total harmonic distortion
Wide dynamic range (16-bit resolution)
Continuous calibration concept
Easy application: single 3 to 5.5 V rail power supply and
output- and bias current are proportional to the supply
voltage
Fast settling time permits 2
, 4
and 8
oversampling
(serial input) or double speed operation at 4
oversampling
Internal bias current ensures maximum dynamic range
Wide operating temperature range of
-
40 to +85
C
Compatible with most of the Japanese input formats:
time multiplexed, two's complement and TTL
No zero crossing distortion.
GENERAL DESCRIPTION
The TDA1545A is the first device of a new generation of
the digital-to-analog converters which embodies the
innovative technique of continuous calibration. The largest
bit-currents are repeatedly generated by one single
current reference source. This duplication is based upon
an internal charge storage principle having an accuracy
insensitive to ageing, temperature and process variations.
The device is fabricated in a 1.0
m CMOS process and
features an extremely low power dissipation, small
package size and easy application. Furthermore, the
accuracy of the high coarse current combined with the
implemented symmetrical offset decoding method
preclude zero-crossing distortion and ensures high quality
audio reproduction. Therefore, the continuous calibration
digital-to-analog converter is eminently suitable for use in
(portable) digital audio equipment.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA1545A
DIP8
plastic dual in-line package; 8 leads (300 mil)
SOT97-1
TDA1545AT
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
TDA1545ATT
TSSOP14
plastic thin shrink small outline package; 14 leads; body width 4.4 mm
SOT402-1
1997 Sep 04
3
Philips Semiconductors
Preliminary specification
Stereo continuous calibration DAC
TDA1545A
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
DD
supply voltage
3
5
5.5
V
I
DD
supply current
V
DD
= 5 V;
at code 0000H
-
3.0
4.0
mA
I
FS
full-scale output current
V
DD
= 5 V
0.9
1.0
1.1
mA
V
DD
= 3 V
-
0.6
-
mA
THD
total harmonic distortion
including noise
at 0 dB
-
-
88
-
78
dB
at 0 dB
-
0.004
0.01
%
at
-
60 dB
-
-
33
-
24
dB
at
-
60 dB
-
2.2
6
%
at
-
60 dB;
-
-
35
-
dB
A-weighting
at
-
60 dB;
-
1.7
-
%
A-weighting
at
-
60 dB;
-
1.4
-
%
A-weighting;
R3 = R4 = 11 k
;
I
FS
= 2 mA
S/N
signal-to-noise ratio at bipolar zero
A-weighting;
at code 0000H
86
98
-
dB
R3 = R4 = 11 k
;
I
FS
= 2 mA
-
101
-
dB
t
cs
current settling time to
1 LSB
-
0.2
-
s
BR
input bit rate at data input
-
-
18.4
Mbits/s
f
BCK
clock frequency at clock input
-
-
18.4
MHz
TC
FS
full-scale temperature coefficient at
analog outputs (IOL; IOR)
-
400
-
ppm
P
tot
total power dissipation
at code 0000H
V
DD
= 5 V
-
15
20
mW
V
DD
= 3 V
-
6
-
mW
T
amb
operating ambient temperature
-
40
-
+85
C
1997 Sep 04
4
Philips Semiconductors
Preliminary specification
Stereo continuous calibration DAC
TDA1545A
k, full pagewidth
BCK
WS
DATA
MCD287 - 1
LEFT INPUT LATCH
LEFT BIT SWITCHES
LEFT OUTPUT LATCH
RIGHT INPUT LATCH
RIGHT BIT SWITCHES
RIGHT OUTPUT LATCH
1 CALIBRATED
SPARE
SOURCE
32 (5-BIT)
CALIBRATED
CURRENT
SOURCES
11-BIT
PASSIVE
DIVIDER
11-BIT
PASSIVE
DIVIDER
CONTROL
AND
TIMING
I BR
I BL
REFERENCE
SOURCE
I BL
I BR
3.9 k
1 nF
C1
R1
IOL
V
REF
3.9 k
1 nF
C2
R2
IOR
V
REF
OP1
OP2
V
out
right
V
out
left
33 k
R4
22 k
R3
V
REF
V
DD
100 nF
C3
ground
(9) 5
(7) 4
(10) 6
(14) 8
(13) 7
1 (1)
2 (2)
3 (6)
TDA1545A
I REF
R
REF
11 k
I REF
(E24)
(E24)
C4
1
F
AND
AND
1 CALIBRATED
SPARE
SOURCE
32 (5-BIT)
CALIBRATED
CURRENT
SOURCES
I REF
I REF
Fig.1 Block diagram.
The numbers given in parenthesis refer to the TDA1545ATT (SOT402-1) version.
1997 Sep 04
5
Philips Semiconductors
Preliminary specification
Stereo continuous calibration DAC
TDA1545A
PINNING
SYMBOL
PIN
DESCRIPTION
SOT96-1;
SOT97-1
SOT402-1
BCK
1
1
bit clock input
WS
2
2
word select input
DATA
3
6
data input
GND
4
7
ground
V
DD
5
9
positive supply voltage
IOL
6
10
left channel output
I
REF
7
13
reference current input
IOR
8
14
right channel output
n.c.
-
3, 4, 5, 8, 11, 12
not connected
Fig.2 Pin configuration (SOT96-1; SOT97-1).
handbook, halfpage
1
2
3
4
8
7
6
5
MCD288 - 1
BCK
WS
DATA
GND
IOR
I REF
IOL
DD
V
TDA1545A
Fig.3 Pin configuration (SOT402-1).
handbook, halfpage
TDA1545ATT
MBK230
1
BCK
IOR
WS
IREF
n.c.
n.c.
n.c.
n.c.
n.c.
IOL
DATA
VDD
GND
n.c.
2
3
4
5
6
7
14
13
12
11
10
9
8
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