Rainbow-electronics MAX5133 Uživatelský manuál stáhnout pdf (Strana 15)

MAX5132/MAX5133

+5V/+3V, 13-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

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Gain Error

Gain error (Figure 8d) is the difference between the

ideal and the actual full-scale output voltage on the

transfer curve, after nullifying the offset error. This error

alters the slope of the transfer function and corre-

sponds to the same percentage error in each step.

Settling Time

The settling time is the amount of time required from the

start of a transition until the DAC output settles to its new

output value within the converter’s specified accuracy.

Digital Feedthrough

Digital feedthrough is noise generated on the DAC’s

output when any digital input transitions. Proper board

layout and grounding will significantly reduce this

noise, but there will always be some feedthrough

caused by the DAC itself.

Unipolar Output

Figure 9 shows the MAX5132/MAX5133 setup for

unipolar, Rail-to-Rail™ operation with a closed-loop

gain of 2V/V. With its internal reference of +2.5V, the

MAX5132 provides a convenient unipolar output range

of 0 to +4.99939V, while the MAX5133 offers an output

range of 0 to +2.499695V with its on-board +1.25V ref-

erence. Table 5 lists example codes for unipolar output

voltages.

Bipolar Output

The MAX5132/MAX5133 can be configured for unity-

gain bipolar operation (FB = OUT) using the circuit

shown in Figure 10. The output voltage V

OUT

is then

given by the following equation:

OUT

= V

REF

[G (NB / 8192) - 1]

000 010001 011 100 101 110

AT STEP

011 (1/2 LSB )

AT STEP

001 (1/4 LSB )

111

DIGITAL INPUT CODE

ANALOG OUTPUT VALUE (LSB)

Figure 8a. Integral Nonlinearity

Figure 8b. Differential Nonlinearity

000 010001 011 100 101

DIFFERENTIAL LINEARITY

ERROR (-1/4 LSB)

DIFFERENTIAL

LINEARITY ERROR (+1/4 LSB)

1 LSB

DIGITAL INPUT CODE

ANALOG OUTPUT VALUE (LSB)

000 010001 011

ACTUAL

DIAGRAM

IDEAL DIAGRAM

ACTUAL

OFFSET POINT

OFFSET ERROR

(+1 1/4 LSB)

IDEAL OFFSET

POINT

DIGITAL INPUT CODE

ANALOG OUTPUT VALUE (LSB)

Figure 8c. Offset Error

Figure 8d. Gain Error

000 101100 110 111

IDEAL DIAGRAM

GAIN ERROR

(-1 1/4 LSB)

IDEAL FULL-SCALE OUTPUT

ACTUAL

FULL-SCALE

OUTPUT

DIGITAL INPUT CODE

ANALOG OUTPUT VALUE (LSB)

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

MAX5132/MAX5133 1

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