MAX5191BEEI+【PDF 14/14 页】IC DAC 8BIT DUAL 40MHZ 28-QSOP

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Sheet目录2010

10页 11页 12页 13页 [14页]

MAX5188/MAX5191

Dual, 8-Bit, 40MHz, Current/Voltage,

Alternate-Phase Output DACs

_______________________________________________________________________________________

External Reference

To disable the MAX5188/MAX5191’s internal reference,

connect REN to DVDD. A temperature-stable external

reference may now be applied to drive the REFO pin

(Figure 3) to set the full-scale output. Choose a refer-

ence that can supply at least 150A to drive the bias

circuit that generates the cascode current for the cur-

rent array. For improved accuracy and drift perfor-

mance, choose a fixed output voltage reference such

as the +1.2V, 25ppm/°C MAX6520 bandgap reference.

Standby Mode

To enter the lower-power standby mode, connect digi-

tal inputs PD and DACEN to DGND. In standby, both

the reference and the control amplifier are active with

the current array inactive. To exit this condition, DACEN

must be pulled high with PD held at DGND. The

MAX5188/MAX5191 typically require 50s to wake up

and allow both the outputs and the reference to settle.

Shutdown Mode

For lowest power consumption, the MAX5188/MAX5191

provide a power-down mode in which the reference,

control amplifier, and current array are inactive and the

DAC’s supply current is reduced to 1A. To enter this

mode, connect PD to DVDD. To return to active mode,

connect PD to DGND and DACEN to DVDD. About 50s

are required for the devices to leave shutdown mode

and settle their outputs to the values prior to shutdown.

Table 1 lists the power-down mode selection.

RSET**

9.6k

IFS

RSET

CCOMP*

REFR

IREF

REFO

MAX4040

+1.2V

BANDGAP

REFERENCE

CURRENT-

SOURCE ARRAY

*COMPENSATION CAPACITOR (CCOMP = 100nF)

**9.6k

REFERENCE CURRENT SET RESISTOR

INTERNAL TO MAX5191 ONLY. USE EXTERNAL

RSET FOR MAX5188.

OPTIONAL EXTERNAL BUFFER

FOR HEAVIER LOADS

REN

MAX5188

MAX5191

IREF =

VREF

RSET

AGND

DGND

Figure 2. Setting IFS with the Internal +1.2V Reference and Control Amplifier

Table 1. Power-Down Mode Selection

X = Don’t care

MAX5191

MAX5188

MAX5191

MAX5188

Shutdown

AGND

Standby

AGND

(POWER-DOWN SELECT)

DACEN

(DAC ENABLE)

POWER-DOWN

MODE

OUTPUT STATE

High-Z

Wake-Up

Last state prior to standby mode

High-Z

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