AD7225KR Analog Devices Inc, AD7225KR Datasheet - Page 13

• Manufacturer Part Number: AD7225KR
• Description: IC DAC 8BIT QUAD W/AMP 24-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD7225KR

• Rohs Status: RoHS non-compliant
• Settling Time: 4µs
• Number Of Bits: 8
• Number Of Converters: 4
• Voltage Supply Source: Dual ±
• Power Dissipation (max): 500mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Data Interface: -

UNIPOLAR OUTPUT OPERATION
This is the basic mode of operation for each channel of the
AD7225, with the output voltage having the same positive
polarity as V
(V
Amp Section, which outlines the advantages of having negative
V
in Figure 16. The voltage at any of the reference inputs must
never be negative with respect to DGND. Failure to observe this
precaution may cause parasitic transistor action and possible
device destruction. The code table for unipolar output
operation is shown in Table 7.
Note,
SS
SS
). Connections for the unipolar output operation are shown
= AGND) or with positive/negative supplies (see the Op
1
LSB
=
REF
(
V
x. The AD7225 can be operated single supply
REF
)
( )
2
−
8
=
V
REF



256
1



Rev. C | Page 13 of 24
Table 7. Unipolar Code Table
MSB
1111
1000
1000
0111
0000
0000
(MSB)
DAC Latch Contents
LDAC
(LSB)
DB7
DB0
WR
A1
A2
AD7225
V
REF
Figure 16. Unipolar Output Circuit
LSB
1111
0001
0000
1111
0001
0000
A V
REF
DAC A
DAC B
DAC C
DAC D
V
B V
SS
REF
C V
AGND
REF
D
Analog Output
0 V
+
+
+
+
+
V
V
V
V
V
V
REF
REF
REF
REF
REF
DGND
DD
( )
( )
( )
( )
( )
256
129
256
128
127
256
256
255
256
1
V
V
V
V
=
OUT
OUT
OUT
OUT
+
AD7225
A
B
C
D
V
REF
2