DAC081S101
www.ti.com
SNAS323C –JUNE 2005–REVISED FEBRUARY 2013
MICROWIRE
DEVICE
DAC081S101
CS
SK
SO
SYNC
SCLK
DIN
Figure 40. Microwire Interface
USING REFERENCES AS POWER SUPPLIES
Recall the need for a quiet supply source for devices that use their power supply voltage as a reference voltage.
Since the DAC081S101 consumes very little power, a reference source may be used as the supply voltage. The
advantages of using a reference source over a voltage regulator are accuracy and stability. Some low noise
regulators can also be used for the power supply of the DAC081S101. Listed below are a few power supply
options for the DAC081S101.
LM4130
The LM4130 reference, with its 0.05% accuracy over temperature, is a good choice as a power source for the
DAC081S101. Its primary disadvantage is the lack of 3V and 5V versions. However, the 4.096V version is useful
if a 0 to 4.095V output range is desirable or acceptable. Bypassing the LM4130 VIN pin with a 0.1µF capacitor
and the VOUT pin with a 2.2µF capacitor will improve stability and reduce output noise. The LM4130 comes in a
space-saving 5-pin SOT23.
Input
Voltage
LM4130-4.1
C2
C1
2.2 mF
0.1 mF
DAC081S101
V
OUT
= 0V to 4.080V
SYNC
DIN
SCLK
Figure 41. The LM4130 as a power supply
LM4050
Available with accuracy of 0.44%, the LM4050 shunt reference is also a good choice as a power regulator for the
DAC081S101. It does not come in a 3 Volt version, but 4.096V and 5V versions are available. It comes in a
space-saving 3-pin SOT-23.
Input
Voltage
R
V
Z
0.47 mF
DAC081S101
SYNC
DIN
SCLK
LM4050-4.1
or
LM4050-5.0
V
OUT
= 0V to 5V
Figure 42. The LM4050 as a power supply
Copyright © 2005–2013, Texas Instruments Incorporated
Submit Documentation Feedback
17
Product Folder Links: DAC081S101
TI [ TEXAS INSTRUMENTS ]
