ADDAC80/ADDAC85/ADDAC87
+V
+V
S
S
1
2
24
23
22
21
20
19
18
17
16
15
14
13
1
2
24
23
22
21
20
19
18
17
16
15
14
13
10kꢀ
TO
100kꢀ
10kꢀ
TO
100kꢀ
10Mꢀ
10Mꢀ
REF
CONTROL
CIRCUIT
REF
CONTROL
CIRCUIT
3
3
0.01ꢃF
0.01ꢃF
–V
–V
S
S
4
4
10kꢀ
TO
100kꢀ
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
10kꢀ
TO
100kꢀ
12-BIT
RESISTOR
LADDER
NETWORK
AND
CURRENT
SWITCHES
5
5
2kꢀ
3kꢀ
3.9Mꢀ
1ꢃF
5kꢀ
6
6
5kꢀ
+V
+V
S
S
7
7
1ꢃF
3.9Mꢀ
5kꢀ
8
8
6.3kꢀ
6.3kꢀ
9
9
–
10
11
12
10
11
12
+
–V
–V
S
S
1ꢃF
1ꢃF
Figure 6. External Adjustment and Voltage Supply
Connection Diagram, Current Model
Figure 7. External Adjustment and Voltage Supply
Connection Diagram, Voltage Model
Offset Adjustment
10Mꢀ
270kꢀ 270kꢀ
For unipolar (CSB) configurations, apply the digital input code
that should produce zero potential output and adjust the
OFFSET potentiometer for zero output. For bipolar (COB, CTC)
configurations, apply the digital input code that should produce
the maximum negative output voltage. Example: If the FULL
SCALE RANGE is connected for 20 V, the maximum negative
output voltage is –10 V. See Table II for corresponding codes.
7.8kꢀ
3.9Mꢀ
180kꢀ 180kꢀ
10kꢀ
Gain Adjustment
Figure 8. Equivalent Resistances
For either unipolar or bipolar configurations, apply the digital
input that should give the maximum positive voltage output.
Adjust the GAIN potentiometer for this positive full-scale voltage.
See Table II for positive full-scale voltages.
Table II. Digital Input Analog Output
Digital Input
12-Bit Resolution
MSB
0 0 0 0 0 0 0 0 0 0 0 0 +9.9976 V
0 1 1 1 1 1 1 1 1 1 1 1 +5.0000 V
1 0 0 0 0 0 0 0 0 0 0 0 +4.9976 V
1 1 1 1 1 1 1 1 1 1 1 1 0.0000 V
Analog Output
Voltage
*
Current
LSB 0 to +10 V
ꢁ10 V
0 to –2 mA
–1.9995 mA
–1.0000 mA
ꢁ1 mA
+9.9951 V
0.0000 V
4.88 mV
–0.9995 mA
0.0000 mA
+0.0005 mA
–1.00 mA
0.488 µA
–0.9995 mA
–10.0000 V 0.0000 mA
–0.0049 V 0.488 µA
l LSB
2.44 mV
*To obtain values for other binary ranges 0 to 5 V range: divide 0 to 10 values by 2; 5 V range: divide
10 V range values by 2; 2.5 V range: divide 10 V range values by 4.
–10–
REV. B
ADI [ ADI ]
