LM4050-4.1

or

LM4050-5.0

DAC081S101

DIN

SCLK

SYNC

0.47 PF

Input

Voltage

R

LM4130-4.1

DAC081S101

DIN

SCLK

SYNC

C1

0.1 PF

C2

2.2 PF

Input

Voltage

MICROWIRE

DEVICE

DAC081S101

CS

SK

SO

SCLK

DIN

SYNC

DAC081S101

www.ti.com

SNAS323C – JUNE 2005 – REVISED FEBRUARY 2013

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.

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.

Figure 42. The LM4050 as a power supply

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Product Folder Links: DAC081S101