AD7175-2 datasheet(21/63 Pages) AD

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AD7175-2

Data Sheet

Rev. B | Page 20 of 62

GETTING STARTED

The AD7175-2 offers the user a fast settling, high resolution,

multiplexed ADC with high levels of configurability.

Two fully differential or four single-ended analog inputs.

Crosspoint multiplexer selects any analog input combina-

tion as the input signals to be converted, routing them to

the modulator positive or negative input.

True rail-to-rail buffered analog and reference inputs.

Fully differential input or single-ended input relative to any

analog input.

Per channel configurability—up to four different setups can be

defined. A separate setup can be mapped to each of the

channels. Each setup allows the user to configure whether

the buffers are enabled or disabled, gain and offset correction,

filter type, output data rate, and reference source selection

(internal/external).

The AD7175-2 includes a precision 2.5 V low drift (±2 ppm/°C)

band gap internal reference. This reference can used for the ADC

conversions, reducing the external component count. Alternatively,

the reference can be output to the REFOUT pin to be used as a

low noise biasing voltage for external circuitry. An example of

this is using the REFOUT signal to set the input common mode

for an external amplifier.

The AD7175-2 includes two separate linear regulator blocks for

both the analog and digital circuitry. The analog LDO regulates

the AVDD2 supply to 1.8 V, supplying the ADC core. The user

can tie the AVDD1 and AVDD2 supplies together for easiest

connection. If there is already a clean analog supply rail in the

system in the range of 2 V (minimum) to 5.5 V (maximum), the

user can also choose to connect this to the AVDD2 input,

allowing lower power dissipation.

DGND

AD7175-2

IOVDD

SYNC/ERROR

REGCAPD

REFOUT

AVSS

0.1µF

REGCAPA

AVDD2

AVDD1

XTAL1

GPIO1

REF–

REF+

2.5V REFERENCE

OUTPUT

4.7µF

0.1µF

VOUT

GND

VIN

0.1µF

4.7µF

VIN

0.1µF

ADR445BRZ

IOVDD

AVDD2

0.1µF

AVDD1

0.1µF

CX1

16MHz

CX2

0.1µF

1µF

0.1µF

1µF

GENERAL-PURPOSE I/O 0 AND

GENERAL-PURPOSE I/O 1

OUTPUT HIGH = AVDDx

OUTPUT LOW = AVSS

OPTIONAL EXTERNAL

CRYSTAL CIRCUITRY

CAPACITORS

GPIO0

CLKIN

OPTIONAL

EXTERNAL

CLOCK

INPUT

AIN0

AIN1

AIN2

AIN3

AIN4

GPIO0

GPIO1

XTAL2/CLKI0

DOUT/RDY

DIN

SCLK

DOUT/RDY

DIN

SCLK

0.1µF

Figure 44. Typical Connection Diagram

AD7175-2 Datasheet(PDF) 21 Page - Analog Devices

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