DAC8565ICPWG4 Datasheet, PDF (36/49 Pages) Texas Instruments – 16-Bit, Quad Channel, Ultra-Low Glitch, Voltage Output

DAC8565
SBAS411C – JUNE 2007 – REVISED MARCH 2011
BIPOLAR OPERATION USING THE DAC8565
The DAC8565 is designed for single-supply
operation, but a bipolar output range is also possible
using the circuit in either Figure 99 or Figure 100.
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.
The output voltage for any input code can be
calculated with Equation 4:
V_O = V_REF ´
D
65536
´
R₁ + R₂
R₁
- V_REF ´
R₂
R₁
(4)
where D represents the input code in decimal
(0–65535).
With V_REFH = 5V, R₁ = R₂ = 10kΩ.
V_O =
10 ´ D
65536
- 5V
(5)
This result has an output voltage range of ±5V with
0000h corresponding to a –5V output and FFFFh
corresponding to a +5V output, as shown in
Figure 99. Similarly, using the internal reference, a
±2.5V output voltage range can be achieved, as
Figure 100 shows.
VH
REF
AV
DD
R₁
10kW
10mF
0.1mF
AV_DD
V_REFH _DAC8565
V_REFL
V_OUT
GND
www.ti.com
R₂
10kW
+6V
OPA703
±5V
-6V
3-Wire
Serial Interface
Figure 99. Bipolar Output Range Using External
Reference at 5V
AV
DD
R₁
10kW
AV_DD
V_REFH _DAC8565
V_OUT
150nF
V_REFL _GND
R₂
10kW
+6V
OPA703
-6V
±2.5V
3-Wire
Serial Interface
Figure 100. Bipolar Output Range Using Internal
Reference
36
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