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

10

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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.

Table 1. Power-Down Mode Selection

X = Don’t care

9.6k*

0.1

µF

10

µF

REFR

REFO

+1.2V

BANDGAP

REFERENCE

REN

DGND

AGND

AGND

CURRENT-

SOURCE ARRAY

EXTERNAL

+1.2V

REFERENCE

*9.6k

Ω REFERENCE CURRENT-SET RESISTOR

INTERNAL TO MAX5184 ONLY. USE EXTERNAL

MAX5181

MAX5184

MAX6520

Figure 3. MAX5181/MAX5184 with External Reference

Wake-Up

High-Z

High-Z

MAX5181

MAX5181

AGND

MAX5184

Shutdown

X

1

Last state prior to standby mode

1

0

AGND

MAX5184

Standby

0

0

OUTPUT STATE

POWER-DOWN MODE

DACEN (DAC ENABLE)

PD

(POWER-DOWN SELECT)