HI1-565AJD-5【PDF 5/9 页】CONV D/A 12BIT 6.7MHZ 24-DIP

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Sheet目录1995

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added to convert this current to a voltage. Refer to Table 2

for the voltage output case, along with Figure 1 or Figure 2.

Calibration is a two step process for each of the five output

ranges shown in Table 2. First adjust the negative full scale

(zero for unipolar ranges). This is an offset adjust which

translates the output characteristic, i.e., affects each code by

the same amount.

Next adjust positive FS. This is a gain error adjustment, which

rotates the output characteristic about the negative FS value.

For the bipolar ranges, this approach leaves an error at the

zero code, whose maximum value is the same as for integral

nonlinearity error. In general, only two values of output may

be calibrated exactly; all others must tolerate some error.

Choosing the extreme end points (plus and minus full scale)

minimizes this distributed error for all other codes.

TABLE 2. OPERATING MODES AND CALIBRATION

MODE

CIRCUIT CONNECTIONS

CALIBRATION

OUTPUT

PRANGE

PIN 10 TO

PIN 11 TO

RESlSTOR (R)

APPLY

INPUT CODE

ADJUST

TO SET

Unipolar

(See Figure 1)

0 to +10V

Pin 10

1.43K

All 0’s

All 1’s

+9.99756V

0 to +5V

Pin 9

1.1K

All 0’s

All 1’s

+4.99878V

Bipolar

(See Figure 2)

±10V

1.69K

All 0’s

All 1’s

-10V

+9.99512V

±5V

Pin 10

1.43K

All 0’s

All 1’s

-5V

+4.99756V

±2.5V

Pin 9

1.1K

All 0’s

All 1’s

-2.5V

+2.49878V

REF OUT

x CODE)

(4 x I REF

3.5K

CODE

INPUT

DAC

2.5K

DAC

OUT

9.95K

20V SPAN

10V SPAN

R (SEE

0.5mA

I REF

HI-565A

19.95K

BIP.

OFF.

VCC

712

MSB

LSB

REF

GND

REF

10V

-VEE

PWR

GND

100

TABLE 2)

+15V

-15V

100k

100

50k

FIGURE 1. UNIPOLAR VOLTAGE OUTPUT

HI-565A

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