Rainbow-electronics MAX5123 Bedienungsanleitung PDF herunterladen (Seite 9)

MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

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Analog Output Voltage. High impedance if part is in shutdown.OUT2

Power-Down Lockout (Digital Input).

1: Normal operation.

0: Disallows shutdown (device cannot be powered down).

PDL

Reset Value Input (Digital Input).

1: Connect to V

to select midscale as the output reset value.

0: Connect to DGND to select 0V as the output reset value.

RSTVAL3

Active-Low Chip-Select Input (Digital Input)

Serial Clock InputSCLK8

Serial Data Input. Data is clocked in on the rising edge of SCLK.DIN7

Reset DAC Input (Digital Input). Clears the DAC to its predetermined (RSTVAL) output state. Clearing the

DAC will cause it to exit a software shutdown state.

CLR

Serial Data OutputDOUT10

Power-Down Input (Digital Input). Pulling PD high when PDL = V

places the IC into shutdown with a maxi-

mum shutdown current of 20µA.

PD12

User-Programmable Output (Digital Output)UPO11

Buffered Reference Output/Input. In internal reference mode, the reference buffer provides a +2.5V

(MAX5122) or +1.25V (MAX5123) nominal output, externally adjustable at REFADJ. In external reference

mode, disable the internal reference by pulling REFADJ to V

and applying the external reference to REF.

REF14

Positive Power Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to AGND.V

Amplifier Inverting Sense Input (Analog Input)FB1

FUNCTIONNAME

Analog Reference Adjust Input. Bypass with a 33nF capacitor to AGND. Connect to V

when using an

external reference.

REFADJ15

Analog GroundAGND13

Digital GroundDGND9

Pin Description

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Rainbow-electronics MAX5123 Bedienungsanleitung Seite 9