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Pin description – Rainbow Electronics MAX5123 User Manual

Page 9

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MAX5122/MAX5123

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

with 10ppm/°C Internal Reference

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9

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

OUT

2

Power-Down Lockout (Digital Input).
1: Normal operation.
0: Disallows shutdown (device cannot be powered down).

PDL

4

Reset Value Input (Digital Input).
1: Connect to V

DD

to select midscale as the output reset value.

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

RSTVAL

3

Active-Low Chip-Select Input (Digital Input)

CS

6

Serial Clock Input

SCLK

8

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

DIN

7

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

5

Serial Data Output

DOUT

10

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

DD

places the IC into shutdown with a maxi-

mum shutdown current of 20µA.

PD

12

User-Programmable Output (Digital Output)

UPO

11

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

DD

and applying the external reference to REF.

REF

14

PIN

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

V

DD

16

Amplifier Inverting Sense Input (Analog Input)

FB

1

FUNCTION

NAME

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

DD

when using an

external reference.

REFADJ

15

Analog Ground

AGND

13

Digital Ground

DGND

9

Pin Description