Datasheet

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

AIN+

AIN-

INTERFACE

DIN

SCLK

DOUT

CNVST

REFIN AVDD DVDD

AGND DGND

MAX11901

OVDD

REFERENCE

BUFFER

REFERENCE

BUFFER

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Maxim Integrated

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MAX11901 16-Bit, 1.6Msps, Low-Power,

Fully Differential SAR ADC

Functional Diagram

Pin Description (continued)