AD4115 datasheet(14/51 Pages) AD

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AD4115

Data Sheet

Rev. 0 | Page 14 of 51

THEORY OF OPERATION

The AD4115 offers a fast settling, high resolution, multiplexed

ADC with high levels of configurability, including the following

features:

•

Eight fully differential voltage inputs or 16 single-ended

voltage inputs.

•

High impedance voltage divider with integrated precision

matched resistors

•

Embedded proprietary iPassives® technology within a

small device footprint.

•

Per channel configurability where up to eight different

setups can be defined. A separate setup can be mapped to

each channel. Each setup allows the user to configure

whether the buffers are enabled or disabled, gain and offset

correction, filter type, ODR, and reference source selection.

•

Highly configurable digital filter enabling conversion rates

up to 125 kSPS on a single channel and 24.845 kSPS

switching.

The AD4115 includes a precision, 2.5 V, low drift (±5 ppm/°C),

band gap internal reference. Use this reference in ADC

conversions to reduce the external component count. When

enabled, the internal reference is output to the REFOUT pin.

The internal reference can be used as a low noise biasing

voltage for the external circuitry and must be connected to a

0.1 μF decoupling capacitor.

The AD4115 includes two separate linear regulator blocks for

the analog and digital circuitry. The analog LDO regulator

regulates the AVDD supply to 1.8 V.

The linear regulator for the digital IOVDD supply performs a

function similar to the LDO regulator and regulates the input

voltage applied at the IOVDD pin to 1.8 V. The serial interface

signals always operate from the IOVDD supply seen at the pin.

For example, if 3.3 V is applied to the IOVDD pin, the interface

logic inputs and outputs operate at this level.

The AD4115 is designed for a multitude of factory automation

and process control applications, including PLC and DCS

modules. The AD4115 reduces overall system cost and design

burden and maintains a high level of accuracy. The AD4115

offers the following system benefits:

•

A single 5 V power supply.

•

Guaranteed minimum 1 MΩ input impedance.

•

Overrange voltage greater than ±10 V.

•

Reduced calibration costs.

•

High channel count.

DGND

AD4115

IOVDD

REGCAPD

AVSS

REGCAPA

AVDD

XTAL1

IOVDD

0.1µF

AVDD

0.1µF

CX1

16MHz

CX2

0.1µF

1µF

0.1µF

1µF

OPTIONAL EXTERNAL

CRYSTAL CIRCUITRY

CAPACITORS

CLKIN

OPTIONAL

EXTERNAL

CLOCK

INPUT

VIN0

VIN1

VINCOM

XTAL2/CLKIO

DOUT/RDY

DIN

SCLK

DOUT/RDY

DIN

SCLK

VBIAS–

REFOUT 6

0.1µF

VIN15

Figure 19. Typical Connection Diagram

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