INTEGRATED CIRCUITS
DATA SHEET
TDA8444; TDA8444T;
TDA8444AT
Octuple 6-bit DACs with I
2
C-bus
Product specification
Supersedes data of March 1991
File under Integrated Circuits, IC01
1999 Apr 29
Philips Semiconductors
Product specification
Octuple 6-bit DACs with
FEATURES
•
Eight DACs with 6-bit resolution
•
Adjustable common output swing
•
Push-pull outputs
•
Outputs short-circuit protected
•
Three programmable slave address bits
•
Large supply voltage range
•
Low temperature coefficient.
GENERAL DESCRIPTION
I
2
C-bus
TDA8444; TDA8444T;
TDA8444AT
The interface circuit is a bipolar IC in a DIP16, SO16, or
SO20 package made in an I2L-compatible 18 V process.
QUICK REFERENCE DATA
SYMBOL
V
CC
I
CC
P
V
VMAX
V
o(DACn)
V
o(DACn)(max)
I
source(min)
I
sink(min)
PARAMETER
supply voltage
supply current
power dissipation
input effective voltage
DAC output voltage
minimum DAC source current
minimum DAC sink current
V
MAX
= V
CC
data = 1FH
data = 1FH
V
CC
= 12 V
The TDA8444 contains eight programmable 6-bit DAC
outputs, an I
2
C-bus slave receiver with three (two for
SO16) programmable address bits and one input (V
MAX
) to
set the maximum output voltage. Each DAC can be
programmed separately by a 6-bit word to 64 values, but
V
MAX
determines the maximum output voltage for all
DACs. The resolution will be approximately
1
⁄
64
V
MAX
.
At power-on all DACs are set to their lowest value.
CONDITIONS
−
−
1
MIN.
4.5
12
14
TYP.
−
−
MAX.
13.2
UNIT
V
mA
mW
V
V
V
mA
mA
170
−
−
−
−
V
CC
−
2.0
V
CC
−
0.5
−
−
0.1
−
2
2
maximum DAC output voltage 1 < V
MAX
< V
CC
−
2.0
V
MAX
+ 0.3
−
ORDERING INFORMATION
TYPE
NUMBER
TDA8444
TDA8444T
TDA8444AT
PACKAGE
NAME
DIP16
SO16
SO20
DESCRIPTION
plastic dual in-line package; 16 leads (300 mil); long body
plastic small outline package; 16 leads; body width 7.5 mm
plastic small outline package; 20 leads; body width 7.5 mm
VERSION
SOT38-1
SOT162-1
SOT163-1
1999 Apr 29
2
Philips Semiconductors
Product specification
Octuple 6-bit DACs with
BLOCK DIAGRAM
I
2
C-bus
TDA8444; TDA8444T;
TDA8444AT
handbook, full pagewidth
A0
5
A1
6
A2
7
VCC
1
VEE
8
SDA
SCL
3
4
I
2
C BUS
SLAVE RECEIVER
REFERENCE
VOLTAGE
GENERATOR
TDA8444
VMAX
2
DAC0
9
DAC0
DAC1
10
DAC1
DAC2
11
DAC2
DAC3
12
DAC3
DAC4
13
DAC4
DAC5
14
DAC5
DAC6
15
DAC6
DAC7
16
DAC7
MGH513
Fig.1 Block diagram.
1999 Apr 29
3
Philips Semiconductors
Product specification
Octuple 6-bit DACs with
PINNING
I
2
C-bus
TDA8444; TDA8444T;
TDA8444AT
PIN
SYMBOL
V
CC
V
MAX
SDA
SCL
A0
A1
A2
V
EE
DAC0
DAC1
DAC2
DAC3
DAC4
DAC5
DAC6
DAC7
n.c.
TDA8444
(DIP16)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
−
TDA8444T
(SO16)
1
2
3
4
6
7
−
8
9
10
11
12
13
14
15
16
5
TDA8444AT
(SO20)
1
2
3
4
7
8
9
10
11
13
14
15
16
17
18
20
5, 6, 12, 19
supply voltage
control input for DAC maximum output voltage
I
2
C-bus serial data input/output
I
2
C-bus serial clock
programmable address bit 0 for I
2
C-bus slave receiver
programmable address bit 1 for I
2
C-bus slave receiver
programmable address bit 2 for I
2
C-bus slave receiver
ground
analog voltage output 0
analog voltage output 1
analog voltage output 2
analog voltage output 3
analog voltage output 4
analog voltage output 5
analog voltage output 6
analog voltage output 7
not connected
DESCRIPTION
handbook, halfpage
VCC 1
VMAX 2
SDA 3
SCL 4
handbook, halfpage
16 DAC7
15 DAC6
14 DAC5
13 DAC4
VCC 1
VMAX 2
SDA 3
SCL 4
16 DAC7
15 DAC6
14 DAC5
13 DAC4
TDA8444
A0 5
A1 6
A2 7
VEE 8
MGH512
TDA8444T
12 DAC3
11 DAC2
10 DAC1
9
DAC0
n.c. 5
A0 6
A1 7
VEE 8
MGL531
12 DAC3
11 DAC2
10 DAC1
9
DAC0
Fig.2 Pin configuration (TDA8444; DIP16).
Fig.3 Pin configuration (TDA8444T; SO16).
1999 Apr 29
4
Philips Semiconductors
Product specification
Octuple 6-bit DACs with
I
2
C-bus
TDA8444; TDA8444T;
TDA8444AT
handbook, halfpage
VCC 1
VMAX 2
SDA 3
SCL 4
n.c. 5
20 DAC7
19 n.c.
18 DAC6
17 DAC5
16 DAC4
TDA8444AT
n.c. 6
A0 7
A1 8
A2 9
VEE 10
MGL532
15 DAC3
14 DAC2
13 DAC1
12 n.c.
11 DAC0
Fig.4 Pin configuration (TDA8444AT; SO20).
FUNCTIONAL DESCRIPTION
I
2
C-bus interface
The I
2
C-bus interface is a receive-only slave, which accepts data according the format shown in Table 1.
Table 1
S
Note
1. S = START condition; A2 to A0 = programmable address bits; A = Acknowledge; I3 to I0 = Instruction bits;
SD to SA = subaddress bits; X = don’t care; D5 to D0 = data bits; P = STOP condition.
Valid addresses are:
TDA8444 and TDA8444AT: 40H, 42H, 44H, 46H, 48H, 4AH, 4CH and 4EH
TDA8444T: 48H, 4AH, 4CH and 4EH (A2 is always logic 1).
All other addresses cannot be acknowledged by the circuit. The actual slave address depends on the programmable
address bits A2, A1 and A0. This way up to eight circuits can be used on one I
2
C-bus.
Valid instructions are: 00H to 0FH; F0H to FFH.
I
2
C-bus format (see note 1)
0 1 0 0 A2 A1 A0 0
A
I3 I2 I1 I0 SD SC SB SA
A
X X D5 D4 D3 D2 D1 D0
A
P
1999 Apr 29
5
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