Rainbow-electronics MAX5190 Bedienungsanleitung PDF herunterladen (Seite 11)

MAX5187/MAX5190

8-Bit, 40MHz, Current/Voltage-Output DACs

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Outputs

The MAX5187 output is designed to supply full-scale

output currents of 1mA into 400Ω loads in parallel with

a capacitive load of 5pF. The MAX5190 features inte-

grated 400Ω resistors that restore the array current to

proportional, differential voltages of 400mV. These dif-

ferential output voltages can then be used to drive a

balun transformer or a low-distortion, high-speed oper-

ational amplifier to convert the differential voltage into a

single-ended voltage.

Applications Information

Static and Dynamic

Performance Definitions

Integral Nonlinearity

Integral nonlinearity (INL) (Figure 5a) is the deviation of

the values on an actual transfer function from either a

best-straight-line fit (closest approximation to the actual

transfer curve) or a line drawn between the endpoints

of the transfer function once offset and gain errors have

been nullified. For a DAC, the deviations are measured

every single step.

Differential Nonlinearity

Differential nonlinearity (DNL) (Figure 5b) is the differ-

ence between an actual step height and the ideal value

of 1LSB. A DNL error specification of less than 1LSB

guarantees no missing codes and a monotonic transfer

function.

Offset Error

Offset error (Figure 5c) is the difference between the

ideal and the actual offset point. For a DAC, the offset

point is the step value when the digital input is zero.

This error affects all codes by the same amount and

can usually be compensated by trimming.

Figure 5a. Integral Nonlinearity

Figure 5b. Differential Nonlinearity

Figure 5c. Offset Error

Figure 5d. Gain Error

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

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

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

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

1 2 ... 6 7 8 9 10 11 12 13 14 15

MAX5187/MAX5190 1

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