AD7237A/AD7247A
AD7247A PIN FUNCTION DESCRIPTION (DIP PIN NUMBERS)
Pin
1
2
3
Mnemonic
REF OUT
R
OFSB
V
OUTB
Description
Voltage Reference Output. The internal 5 V analog reference is provided at this pin. To operate the part
with internal reference, REF OUT should be connected to REF IN.
Output Offset Resistor for DAC B. This input configures the output ranges for DAC B. It is connected to
V
OUTB
for the +5 V range, to GND for the +10 V range and to REF IN for the
±
5 V range.
Analog Output Voltage from DAC B. This is the buffer amplifier output voltage. Three different output
voltage ranges can be chosen: 0 V to +5 V, 0 V to +10 V and
±
5 V. The amplifier is capable of developing
+10 V across a 2 kΩ resistor to GND.
Data Bit 11 (MSB).
Data Bit 10.
Ground. Ground reference for all on-chip circuitry.
Data Bit 9 to Data Bit 1.
Data Bit 0 (LSB).
Chip Select Input for DAC B. Active low logic input. DAC B is selected when this input is active.
Chip Select Input for DAC A. Active low logic input. DAC A is selected when this input is active.
Write Input.
WR
is an active low logic input which is used in conjunction with
CSA
and
CSB
to write data
to the DAC latches.
Positive Supply (+12 V to +15 V).
Analog Output Voltage from DAC A. This is the buffer amplifier output voltage. Three different output
voltage ranges can be chosen: 0 V to +5 V, 0 V to +10 V and
±
5 V. The amplifier is capable of developing
+10 V across a 2 kΩ resistor to GND.
Negative Supply (0 V or –12 V to –15 V).
Output Offset Resistor for DAC A. This input configures the output ranges for DAC A. It is connected to
V
OUTA
for the +5 V range, to GND for the +10 V range and to REF IN for the
±
5 V range.
Voltage Reference Input. The common reference voltage for both DACs is applied to this pin. It is internally
buffered before being applied to both DACs. The nominal reference voltage for correct operation of the
AD7247A is 5 V.
AD7247A PIN CONFIGURATION
DIP and SOIC
4
5
6
7–15
16
17
18
19
20
21
DB11
DB10
GND
DB9-DB1
DB0
CSB
CSA
WR
V
DD
V
OUTA
22
23
24
V
SS
R
OFSA
REF IN
AD7237A PIN CONFIGURATION
DIP and SOIC
REV. 0
–5–
AD [ ANALOG DEVICES ]
