CS5525 CS5526

DS202F5

25

Measurement and Reference Inputs

AIN+, AIN- - Differential Analog Input, Pins 3, 4.

Differential input pins into the device.

VREF+, VREF- - Voltage Reference Input, Pins 20, 19.

Fully differential inputs which establish the voltage reference for the on-chip modulator.

NBV - Negative Bias Voltage, Pin 5.

Input pin to supply the negative supply voltage for the 20X gain instrumentation amplifier.

May be tied to AGND if AIN+ and AIN- inputs are centered around +2.5 V; or it may be tied

to a negative supply voltage (-2.1 V typical) to allow the amplifier to handle low level signals

more negative than ground.

CPD - Charge Pump Drive, Pin 8.

Square wave output used to provide energy for the charge pump.

Power Supply Connections

VA+ - Positive Analog Power, Pin 2.

Positive analog supply voltage. Nominally +5 V.

VD+ - Positive Digital Power, Pin 13.

Positive digital supply voltage. Nominally +3.0 V or +5 V.

AGND - Analog Ground, Pin 1.

Analog Ground.

DGND - Digital Ground, Pin 12.

Digital Ground.