MP7226 Exar Corporation, MP7226 Datasheet - Page 11

• Manufacturer Part Number: MP7226
• Description: Bicmos Fixed, Quad, Voltage Output, Single Or Dual Supply 8-bit Digital-to-analog Converter
• Manufacturer: Exar Corporation

Offsetting DAC Outputs
DAC offset effects
minimum reference voltage, there is a possibility that the DAC
output will not change when the code is incremented from 0.
Once the DAC has reached the offset voltage of the output
Figure 7. shows examples of offset circuits.
When using the device in single supply applications, and
Rev. 2.00
Reference
V
Output1
Output2
OFFSET
Output
Input
AC
DAC
DAC
DAC
Figure 7. Digitally Programmable Offset Adjustment Circuits
or DC Voltage
DAC
R
R
R
R
R
R
AC Reference Input Signal Circuit (DC Couple)
Figure 8. Digitally Programmable
+
+
–
–
R
R
+
–
11
buffer, the DAC output will begin to increment in a normal opera-
tion.
5V Operation
(V
–5V) . The reference voltage range is reduced along with Some
performance parameter degradation. However the DNL of each
DAC remains at 1 LSB guaranteeing monotonicity.
DD
The MP7226 can be operated with a single power supply
V
V
OUT
OUT
= +5V ) or dual power supplies ( V
–5 V or GND
V
where D
and can vary 0 to 255
V
where D
can vary 0 to 255
OUT
OUT
DAC
V
SS
= D
= D
V
REF
n
n
n
n1
is the digital input code
is the digital input code and
X V
X V
REF
+15 V
REF
+
–
+ V
+ D
V
AGND
OFFSET
DD
n2
X V
MP7226
REF
DD
V
OUT
= +5V and V
SS
=