AD7846
PIN CONFIGURATIONS
Pin
DIP
DB2
1
28
27
26
25
24
PIN FUNCTION DESCRIPTION
Mnemonic
DB2–DB0
V
DD
V
OUT
R
IN
Description
Data I/O pins. DB0 is LSB.
Positive supply for analog circuitry. This is
+15 V nominal.
DAC output voltage pin.
Input to summing resistor of DAC output
amplifier. This is used to select output
voltage ranges. See Table I.
V
REF+
Input. The DAC is specified for V
REF+
= +5 V.
V
REF–
Input. For unipolar operation con-
nect V
REF–
to 0 V and for bipolar operation
connect it to –5 V. The device is specified
for both conditions.
Negative supply for the analog circuitry.
This is –15 V nominal.
Data I/O pins. DB15 is MSB.
Ground pin for digital circuitry.
Positive supply for digital circuitry. This is
+5 V nominal.
R/W input. This can be used to load data to
the DAC or to read back the DAC latch
contents.
Chip select input. This selects the device.
Clear input. The DAC can be cleared to
000 . . . 000 or 100 . . . 000. See Table II.
Asynchronous load input to DAC.
Data I/O pins.
1–3
4
DB3
DB4
DB5
LDAC
CLR
CS
DB1
2
DB0
3
V
DD 4
V
OUT 5
R
IN 6
V
REF+ 7
5
6
AD7846
23
TOP VIEW
22
R/W
V
REF– 8
(Not to Scale)
21
V
CC
V
SS 9
DB15
10
DB14
11
DB13
12
DB12
13
DB11
14
20
19
18
17
16
15
7
8
V
REF+
V
REF–
DGND
DB6
DB7
DB8
DB9
DB10
9
V
SS
10–19 DB15–DB6
20
DGND
21
V
CC
PLCC
DB0
DB1
DB2
DB3
DB4
DB5
V
DD
22
R/W
4
3
2
1
28 27 26
PIN 1
IDENTIFIER
25
24
V
OUT 5
R
IN 6
V
REF+ 7
V
REF– 8
V
SS 9
DB15
10
DB14
11
12 13
14
15
LDAC
CLR
CS
R/W
V
CC
DGND
DB6
23
24
25
CS
CLR
LDAC
AD7846
TOP VIEW
(Not to Scale)
23
22
21
20
19
26–28 DB5–DB3
Table I. Output Voltage Ranges
16
17
18
DB13
DB12
DB11
DB10
DB9
DB8
DB7
Output Range
0 V to +5 V
0 V to +10 V
+5 V to –5 V
+5 V to –5 V
+10 V to –10 V
V
REF+
+5 V
+5 V
+5 V
+5 V
+5 V
V
REF–
0V
0V
–5 V
0V
–5 V
R
IN
V
OUT
0V
V
OUT
+5 V
0V
REV. E
–5–
AD [ ANALOG DEVICES ]
