DAC8871 Datasheet, PDF (16/19 Pages) Burr-Brown (TI) – 16-Bit, Single-Channel, ±18V Output (Unbuffered), Ultra-Low Power, Serial Interface DIGITAL-TO-ANALOG CONVERTER

DAC8871
SBAS396 – JUNE 2007
APPLICATION INFORMATION
www.ti.com
REFERENCE INPUT
The DAC full-scale output voltage is determined by the reference voltage, as shown in the Output Range
section.
Reference input V_REFH can be any voltage from 0V to +18V. Reference input V_REFL can be any voltage from
–18V to 0V. The current into the V_REFH input and out of V_REFL depends on the DAC output voltages. Refer to
Figure 27 and Figure 28 for details. The reference input appears as a varying load to the reference. If the
reference can sink or source the required current, a reference buffer is not required. The DAC8871 features a
reference drive (force) and sense connection that minimizes the internal errors caused by the changing
reference current and the circuit impedances. Figure 40 shows a typical reference configuration.
V_REFH
OPA2277
DAC8871
V_REFH-F
V_REFL
OPA2277
V_REFH-S
V_REFL-F
V_REFL-S
Figure 40. Buffered Reference Connection
POWER SUPPLY BYPASSING
For accurate, high-resolution performance, bypassing the supply pins with a 10µF tantalum capacitor in parallel
with a 0.1µF ceramic capacitor is recommended.
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