DAC712PLG4 datasheet(16/23 Pages) TI1

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GAIN AND OFFSET ADJUST

Connections Using Potentiometers

OUTPUT VOLTAGE RANGE CONNECTIONS

Using D/A Converters

10kW

±10VVOUT

9.75kW

IDAC

0mA-2mA

» +2.5V

15kW

27kW

10kW

120W

180W

500W

170W

250W

Internal

+10VReference

REFOUT

GainAdjust

BipolarOffsetAdjust

ACOM

DAC712

SBAS023A – SEPTEMBER 2000 – REVISED JULY 2009 ................................................................................................................................................. www.ti.com

Nominal values of GAIN and OFFSET occur when

the D/A converter outputs are at approximately half

scale, +5V.

GAIN and OFFSET adjust pins provide for trim using

external

potentiometers.

15-turn

potentiometers

provide sufficient resolution. Range of adjustment of

The DAC712 output amplifier is connected internally

these trims is at least ±0.3% of Full-Scale Range; see

for the ±10V bipolar (20V) output range. That is, the

Figure 13.

bipolar offset resistor is connected to an internal

reference voltage and the 20V range resistor is

connected internally to VOUT. The DAC712 cannot be

connected for unipolar operation.

The GAIN ADJUST and OFFSET ADJUST circuits of

the DAC712 have been arranged so that these points

may be easily driven by external D/A converters; see

Figure 14. 12-bit D/A converters provide an OFFSET

adjust resolution and a GAIN adjust resolution of

µV to 50µV per LSB step.

(1) For no external adjustments, pins 4 and 6 are not connected. External Resistors R1 to R4 are standard ±1% values. Range of adjustment

is at least ±0.3% FSR.

Figure 13. Manual Offset and Gain Adjust Circuits

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