DAC1006LCWM datasheet(12/22 Pages) NSC

12 / 22 page

542 Current Switching with Bipolar Output Voltage

The circuit of

Figure 12 shows the 3 adjustments needed

The first step is to set all of the digital inputs LOW (to force

IOUT1 to 0) and then trim ‘‘zero adj’’ for zero volts at the

inverting input (pin 2) of 0A1 Next with a code of all zeros

still applied adjust ‘‘bFS adj’’ the reference voltage for

VOUTe g

l(ideal VREF)l The sign of the output voltage will

be opposite that of the applied reference

Finally set all of the digital inputs HIGH and adjust ‘‘aFS

adj’’ for VOUTeVREF (511512) The sign of the output at

this time will be the same as that of the reference voltage

The addition of the 200X resistor in series with the VREF pin

of the DAC is to force the circuit gain error from the DAC to

be negative This insures that adding resistance to Rfb with

the 500X pot will always compensate the gain error of the

DAC

543 Voltage Switching with a Unipolar Output Voltage

Refer to the circuit of

Figure 13 and set all digital inputs

LOW Trim the ‘‘zero adj’’ for VOUTe0VDCg1 mV Then

set all digital inputs HIGH and trim the ‘‘FS Adj’’ for

VOUTe(aV)

1aR1R

J1023

1024

544 Voltage Switching with a Bipolar Output Voltage

Refer to

Figure 14 and set all digital inputs LOW Trim the

‘‘bFS Adj’’ for VOUTeb25 VDC Then set all digital inputs

HIGH and trim the ‘‘aFS Adj’’ for VOUTea25 (511512)

VDC Test the zero by setting the MS digital input HIGH and

all the rest LOW Adjust VOS of amp

3 if necessary and

recheck the full-scale values

FIGURE 12 Full Scale Adjust

Current Switching with Bipolar Output Voltage

VREFsVOUTsaVREF

511

512

TLH5688 – 14

FIGURE 13 Full Scale Adjust

Voltage Switching with a Unipolar Output Voltage

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