Datasheet

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APPLICATION INFORMATION
Unipolar Output Operation
DAC
DAC8830
SDI
SCLK
CS
DGND
V
OUT
0.1
µ
F
V
O
= 0 to +V
REF
AGND
Serial
Interface
Input
Register
DAC Latch
V
DD
V
REF
+5 V +2.5 V
OPA277
OPA704
OPA727
+
0.1
µ
F
10
µ
F
DAC8830
DAC8831
SLAS449D FEBRUARY 2005 REVISED SEPTEMBER 2007
These DACs are capable of driving unbuffered loads of 60 k . Unbuffered operation results in low supply current
(typically 5 μ A) and a low offset error. The DAC8830 provides a unipolar output swing ranging from 0 V to V
REF
.
The DAC8831 can be configured to output both unipolar and bipolar voltages. Figure 45 and Figure 46 show a
typical unipolar output voltage circuit for each device, respectively. The code table for this mode of operation is
shown in Table 1 .
Table 1. Unipolar Code
DAC LATCH CONTENTS
MSB LSB ANALOG OUTPUT
1111 1111 1111 1111 V
REF
× (65,535/65,536)
1000 0000 0000 0000 V
REF
× (32,768/65,536) = 1/2 V
REF
0000 0000 0000 0001 V
REF
× (1/65,536)
0000 0000 0000 0000 0 V
Figure 45. Unipolar Output Mode of DAC8830
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