HI3-DAC80V-5 Ver la hoja de datos (PDF) - Intersil

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HI3-DAC80V-5

12-Bit, Low Cost, Monolithic D/A Converters

Intersil 

HI-DAC80V, HI-DAC85V

Reference Supply

An internal 6.3V reference is provided on board the

HI-DAC80V/HI-DAC85V. The voltage (pin 24) is accurate to

±0.8% and must be connected to the reference input (pin 16)

for specified operation. This reference may be used exter-

nally, provided current drain is limited to 2.5mA. An external

buffer amplifier is recommended if this reference is to be

used to drive other system components. Otherwise, varia-

tions in the load driven by the reference will result in gain

variations of the HI-DAC80V/HI-DAC85V. All gain adjust-

ments should be made under constant load conditions.

Output Voltage Ranges

24

17

-

+

6.3K

16

+VS

12.6kΩ

R1

23

2.8MΩ

CONTROL

AMP

-VS

10kΩ TO

100kΩ

0.01µF

18

5kΩ 19

+VS

R2

5kΩ

3.9

MΩ

20

-VS

5kΩ

TO

100kΩ

-

15

+

21

FIGURE 2. HI-DAC80V/HI-DAC85V

TABLE 3. GAIN AND OFFSET CALIBRATIONS

UNIPOLAR CALIBRATION

Step 1:

Offset

Turn all bits OFF (11 . . . 1)

Adjust R2 for 0V out

Step 2:

Gain

Turn all bits ON (00 . . . 0)

Adjust R1 for FS - 1 LSB

That is:

4.9988 for 0 to +5V range

9.9976 for 0 to +10V range

BIPOLAR CALIBRATION

Step 1:

Offset

Turn all bits OFF (11 . . . 1)

Adjust R2 for Negative FS

That is:

-10V for ±10V range

-5V for ±5V range

-2.5V for ±2.5V range

Step 2:

Gain

Turn all bits ON (00 . . . 0)

Adjust R1 for Positive FS - 1 LSB

That is:

+9.9951V for ±10V Range

+4.9976V for ±5V Range

+2.4988V for ±2.5V Range

This Bipolar procedure adjusts the output range end points. The

maximum error at zero (half scale) will not exceed the Linearity

Error. See the “Accuracy” Specifications.

Unipolar

Bipolar

TABLE 2. RANGE CONNECTIONS

RANGE

0 to +5V

0 to +10V

±2.5V

±5V

±10V

PIN 15

18

18

18

18

19

CONNECT

PIN 17

NC

NC

20

20

20

PIN 19

20

NC

20

NC

15

10-1039

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