DAC8830-EP Datasheet, PDF (19/32 Pages) Texas Instruments – 16-Bit, Ultra-Low Power, Voltage-Output Digital-to-Analog Converters

DAC8830-EP
DAC8831-EP
www.ti.com
SGLS334C – AUGUST 2006 – REVISED APRIL 2007
APPLICATION INFORMATION
Unipolar Output Operation
These DACs are capable of driving unbuffered loads of 60 kΩ. Unbuffered operation results in low supply
current (typically 5 μA) 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 46 and Figure 47
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
1111 1111 1111 1111
1000 0000 0000 0000
0000 0000 0000 0001
0000 0000 0000 0000
Analog Output
V_REF × (65,535/65,536)
V_REF × (32,768/65,536) = V_REF
V_REF × (1/65,536)
0V
+5 V
+2.5 V
0.1 µF
V_DD
+
0.1 µF
10 µF
V_REF
OPA277
OPA704
OPA727
DAC
V_OUT
V_O = 0 to +V_REF
CS
AGND
SCLK
SDI
Input
Register
DGND
DAC Latch
DAC8830
Figure 46. Unipolar Output Mode of DAC8830
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