DAC712PL datasheet(13/23 Pages) TI1

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LOGIC INPUT COMPATIBILITY

GAIN AND OFFSET ADJUSTMENTS

+Full-Scale

AllBits

Logic0

1LSB

Rangeof

OffsetAdjust

Translates

theLine

DigitalInput

AllBits

Logic1

Full-Scale

Range

GainAdjust

RotatestheLine

- Full-Scale

MSBonAll

OthersOff

Bipolar

Offset

Rangeof

GainAdjust

» ±0.3%

R=1k:A ,A ,

WRCLR

3k:D ...D

ESDProtectionCircuit

6.8V

5pF

Digital

Input

-VCC

INPUT CODING

INTERNAL REFERENCE

OUTPUT VOLTAGE SWING

Offset Adjustment

DAC712

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

The DAC712 digital inputs are TTL-compatible (1.4V

Figure 10 illustrates the relationship of offset and gain

switching level) with low-leakage, high-impedance

adjustments for a bipolar connected D/A converter.

inputs. Thus, the inputs are suitable for being driven

Offset should be adjusted first to avoid interaction of

by any type of 5V logic such as 5V CMOS logic. An

adjustments. Table 1 shows calibration values and

equivalent circuit of a digital input is shown in

codes. These adjustments have a minimum range of

Figure 9.

±0.3%.

Data inputs float to logic '0' and control inputs float to

logic '0' if left unconnected. It is recommended that

any unused inputs be connected to DCOM to improve

noise immunity.

Digital inputs remain high-impedance when power is

off.

Figure 10. Relationship of Offset and Gain

Figure 9. Equivalent Circuit of Digital Inputs

Adjustments

Table 1. Digital Input and Analog Output Voltage

Calibration Values

The DAC712 is designed to accept positive-true

binary twos complement (BTC) input codes that are

DAC712 CALIBRATION VALUES

1 LEAST SIGNIFICANT BIT = 305

µV

compatible with bipolar analog output operation. For

bipolar analog output configuration, a digital input of

DIGITAL INPUT

CODE BINARY

7FFFh gives a positive full-scale output, 8000h gives

TWOS

a negative full-scale output, and 0000h gives bipolar

COMPLEMENT,

ANALOG OUTPUT

zero output.

BTC

(V)

DESCRIPTION

Positive Full-Scale –

7FFFh

+9.999695

1LSB

4000h

+5.000000

3/4 Scale

The DAC712 contains a +10V reference.

0001h

+0.000305

BPZ + 1LSB

The reference output may be used to drive external

0000h

0.000000

Bipolar Zero (BPZ)

loads, sourcing up to 2mA. The load current should

FFFFh

–0.000305

BPZ – 1LSB

be constant, otherwise the gain and bipolar offset of

the converter will vary.

C000h

–5.000000

1/4 Scale

8000h

–10.00000

Negative Full-Scale

The output amplifier of the DAC712 is committed to a

±10V output range. The DAC712 provides a ±10V

Apply the digital input code that produces the

output swing while operating on ±11.4V or higher

maximum negative output voltage and adjust the

voltage supplies.

offset potentiometer or the offset adjust D/A converter

for –10V.

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