LM4132-4.1

DAC084S085

DIN

SCLK

SYNC

VOUT = 0V to 4.092V

C1

0.1 PF

C2

2.2 PF

Input

Voltage

VA VREFIN

C3

0.1 PF

OUTPUT

VOLTAGE

DIGITAL INPUT CODE

0

0

255

ZE

FSE

GE = FSE - ZE

FSE = GE + ZE

255 x VREFIN

256

21

DAC084S085

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SNAS363F – MAY 2006 – REVISED MARCH 2016

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Typical Application (continued)

9.2.3 Application Curve

Figure 37. Input / Output Transfer Characteristic

10 Power Supply Recommendations

10.1 Using References as Power Supplies

While the simplicity of the DAC084S085 implies ease of use, it is important to recognize that the path from the

reference input (VREFIN) to the VOUTs has essentially zero power supply rejection ratio (PSRR). Therefore, it is

necessary to provide a noise-free supply voltage to VREFIN. To use the full dynamic range of the DAC084S085,

the supply pin (VA) and VREFIN can be connected together and share the same supply voltage. Because the

DAC084S085 consumes very little power, a reference source may be used as the reference input and/or 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. Listed below are a few reference and power supply options for the

DAC084S085.

10.1.1 LM4130

The LM4130, with its 0.05% accuracy over temperature, is a good choice as a reference source for the

DAC084S085. The 4.096-V version is useful if a 0-V to 4.095-V output range is desirable or acceptable.

Bypassing the LM4130 VIN pin with a 0.1-µF capacitor and the VOUT pin with a 2.2-µF capacitor improves

stability and reduces output noise. The LM4130 comes in a space-saving 5-pin SOT-23.

Figure 38. LM4130 as a Power Supply