ADC14X250 datasheet(5/69 Pages) TI1

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AGND

VA3.0

VIN+

VIN-

+ -

VCM

100

VCM

VA3.0

AGND

VA3.0

SYSREF+

SYSREF-

1k:

0.5V

1k:

10k:

AGND

VA1.2

ADC14X250

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SLASE49 – DECEMBER 2015

Product Folder Links: ADC14X250

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Pin Functions (continued)

TYPE OR DIAGRAM

DESCRIPTION

NAME

NO.

SYSREF+

Differential SYSREF signal input pins

Each pin is internally terminated to a DC bias with a 1-

Ω resistor. An external 100-Ω differential termination

must always be provided. AC coupling using capacitors

is required for coupling the SYSREF signal to these

pins if the clock driver cannot meet the common-mode

requirements. In the case of AC coupling, the external

termination must be placed on the source side of the

coupling capacitors.

SYSREF–

VA1.2

7, 17, 28

Supply input pin

1.2-V analog power supply pins

These pins must be connected to a quiet source and

decoupled to AGND with a 0.1-

μF and 0.01-μF

capacitor located close to each pin.

VA1.8

12, 29, 32

Supply input pin

1.8-V analog power supply pins

These pins must be connected to a quiet source and

decoupled to AGND with a 0.1-

μF and 0.01-μF

capacitor located close to each pin.

VA3.0

Supply input pin

3-V analog power supply pin

This pin must be connected to a quiet source and

decoupled to AGND with a 0.1-

μF and 0.01-μF

capacitor located close to the pin.

VCM

Input interface common mode voltage

This pin must be bypassed to AGND with low

equivalent series inductance (ESL) 0.1-

μF capacitors.

One capacitor should be placed as close to the pin as

possible and additional capacitors placed at the bias

load points. 10-

μF capacitors should also be placed in

parallel. TI recommends to use VCM to provide the

common mode voltage for the differential analog

inputs. The input common mode bias is provided

internally for the ADC input; therefore, external use of

VCM is recommended, but not strictly required. The

recommended bypass capacitors are always required.

VIN+

Differential analog input pins

Each input pin is terminated to the internal common

mode reference with a resistor for an internal

differential termination. External resistors that terminate

to the common-mode voltage bias are recommended

but not strictly required. The total recommended

differential resistive termination (including the internal

200

Ω termination) is recommended to be between 50

Ω and 200 Ω.

VIN–

Exposed thermal pad

The exposed pad must be connected to the AGND

ground plane electrically and with good thermal

dissipation properties to achieve rated performance.

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