PIN

NAME

I/O

FUNCTION

16

REFVDD

I

Reference Buffer Supply. Nominally at 3V. Bypass to AGND with a 10µF capacitor in parallel

with a 0.1µF capacitor (10µF || 100nF).

17, 18

AGND

I

Analog Ground. Bypass to AGND with a 10µF capacitor in parallel with a 0.1µF capacitor

(10µF || 100nF).

19

AVDD

I

Analog Supply. Nominally at 1.8V.

20

REFIN

I

Input for the Internal Reference Buffer. Voltage must be at least 300mV lower than

REFVDD voltage. If REFIN = 0V, reference buffer will be disabled.

—

EP

—

Exposed Pad. Must be connected to the same plane as AGND.

16-BIT ADC

REFVDD

REFGND

REF

REF

AIN+

AIN-

INTERFACE

DIN

SCLK

DOUT

CNVST

REFIN

AVDD

DVDD

AGND

DGND

MAX11901

OVDD

REFERENCE

BUFFER

REFERENCE

BUFFER

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Maxim Integrated │ 13

MAX11901

16-Bit, 1.6Msps, Low-Power,

Fully Differential SAR ADC

Functional Diagram

Pin Description (continued)