DAC081C081 Datasheet, PDF (23/41 Pages) Texas Instruments – 8-Bit Micro Power Digital-to-Analog Converter

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9 Application and Implementation
DAC081C081, DAC081C085
SNAS449E – FEBRUARY 2008 – REVISED JANUARY 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Bipolar Operation
The DAC081C081 is designed for single-supply operation and thus has a unipolar output. However, a bipolar
output may be obtained with the circuit in Figure 27. This circuit will provide an output voltage range of ±5 Volts.
A rail-to-rail amplifier should be used if the amplifier supplies are limited to ±5 V.
10 pF
R₂
+5V
+
10 PF
R₁
0.1 PF
DAC081C081
SDA
SCL
V_OUT
+5V
-
±5V
+
-5V
Figure 27. Bipolar Operation
The output voltage of this circuit for any code is found to be
V_O = (V_A × (D / 256) × ((R1 + R2) / R1) – V_A × R2 / R1)
where
• D is the input code in decimal form.
(2)
With V_A = 5V and R1 = R2,
V_O = (10 × D / 256) – 5 V
(3)
A list of rail-to-rail amplifiers suitable for this application are indicated in Table 2.
AMP
LMP7701
LMV841
LMC7111
LM7301
LM8261
Table 2. Some Rail-to-Rail Amplifiers
PKGS
SOT23-5
SC70-5
SOT23-5
SO-8
SOT23-5
SOT23-5
TYP V_OS
37 uV
50 uV
0.9 mV
0.03 mV
0.7 mV
TYP I_SUPPLY
0.79 mA
1 mA
25 µA
620 µA
1 mA
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