DAC8551-Q1 Datasheet, PDF (17/28 Pages) Texas Instruments – Automotive 16-Bit, Ultralow-Glitch, Voltage-Output DAC

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DAC8551-Q1
SLASEB8A – FEBRUARY 2016 – REVISED MARCH 2016
Typical Applications (continued)
8.2.1.3 Application Curves
Total unadjusted error (TUE) is a good estimate for the performance of the output as shown in Figure 33. The
linearity of the output or INL is in Figure 34.
0.1
0.05
0
-0.05
-0.1
0
10k 20k 30k 40k 50k 60k 65535
Code
D001
Figure 33. Total Unadjusted Error
10
8
6
4
2
0
-2
-4
-6
-8
-10
0
10k 20k 30k 40k 50k 60k 65535
Code
D002
Figure 34. Integral Nonlineareity
8.2.2 Bipolar Operation Using the DAC8551-Q1
The DAC8551-Q1 has been designed for single-supply operation, but a bipolar output range is also possible
using the circuit in Figure 35. The circuit shown gives an output voltage range of ±V_REF. Rail-to-rail operation at
the amplifier output is achievable using an OPA703 as the output amplifier.
V_REF
R₁
10 kW
10 mF
0.1 mF
DAC8551-Q1
V_REF
V_FB
V_OUT
6V
OPA703
R₂
10 kW
5V
–6 V
Three-Wire
Serial Interface
Figure 35. Bipolar Output Range
The output voltage for any input code can be calculated as follows:
ƪ ǒ Ǔ ǒ Ǔ ǒ Ǔƫ V_O + V_REF
D
65536
R₁ ) R₂
R₁
* V_REF
R₂
R₁
(3)
where D represents the input code in decimal (0–65 535)
with V_REF = 5V, R₁ = R₂ = 10 kΩ.
ǒ Ǔ V_O +
10 D
65536
* 5V
(4)
Using this example, an output voltage range of ±5 V with 0000h corresponding to a –5 V output and FFFFh
corresponding to a 5 V output can be achieved. Similarly, using V_REF = 2.5 V, a ±2.5 V output voltage range can
be achieved.
Copyright © 2016, Texas Instruments Incorporated
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