Datasheet
AD7245A/AD7248A
REV. B
–6–
AD7248A PIN FUNCTION DESCRIPTIONS
(ANY PACKAGE)
Pin Mnemonic Description
l V
SS
Negative Supply Voltage (0 V for single
supply operation).
2 R
OFS
Bipolar Offset Resistor. This provides
access to the on-chip application resistors
and allows different output voltage ranges.
3 REF OUT Reference Output. The on-chip reference
is provided at this pin and is used when
configuring the part for bipolar outputs.
4 AGND Analog Ground.
5 DB7 Data Bit 7.
6 DB6 Data Bit 6.
7 DB5 Data Bit 5.
8 DB4 Data Bit 4.
9 DB3 Data Bit 3.
10 DGND Digital Ground.
11 DB2 Data Bit 2/Data Bit 10.
12 DB1 Data Bit 1/Data Bit 9.
13 DB0 Data Bit 0 (LSB)/Data Bit 8.
Pin Mnemonic Description
14 CSMSB Chip Select Input for MS Nibble. (Active
LOW). This selects the upper 4 bits of the
input latch. Input data is right justified.
15 CSLSB Chip Select Input for LS byte. (Active
LOW). This selects the lower 8 bits of the
input latch.
16 WR Write Input. This is used in conjunction
with CSMSB and CSLSB to load data
into the input latch of the AD7248A.
17 LDAC Load DAC Input (Active LOW). This is
an asynchronous input which when active
transfers data from the input latch to the
DAC latch.
18 V
DD
Positive Supply Voltage.
19 R
FB
Feedback Resistor. This allows access to
the amplifier’s feedback loop.
20 V
OUT
Output Voltage. Three different output
voltage ranges can be chosen: 0 V to 5 V,
0 V to 10 V or –5 V to +5 V.
AD7248A PIN CONFIGURATIONS
DIP and SOIC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
AD7248A
TOP VIEW
(NOT TO SCALE)
V
SS
R
OFS
REF OUT
AGND
(MSB) DB7
DB6
DB5
DB4
DB3
DGND
DB2
DB1
DB0 (LSB)
CSLSB
WR
LDAC
V
DD
R
FB
V
OUT
CSMSB
LCCC
TOP VIEW
(NOT TO SCALE)
20 191
2
3
18
14
15
16
17
4
5
6
7
8
910111213
AGND
(MSB) DB7
DB6
DB5
DB4
CSMSB
CSLSB
WR
LDAC
V
DD
R
FB
V
OUT
V
SS
R
OFS
REF OUT
AD7248A
(LSB) DB0
DB1
DB2
DGND
DB3
PLCC
AGND
(MSB) DB7
DB6
DB5
DB4
CSMSB
CSLSB
WR
LDAC
V
DD
R
FB
V
OUT
V
SS
R
OFS
REF OUT
2 1 20 19
9 10 11 12 13
18
17
16
15
14
4
5
6
7
8
TOP VIEW
(NOT TO SCALE)
PIN 1
IDENTIFIER
AD7248A
(LSB) DB0
DB1
DB2
DGND
DB3
3