CS5451A

4

DS635PP1

Measurement and Reference Input

IIN(1-3)+, IIN(1-3)- - Differential Current Inputs

Differential analog input pins for current channels.

VIN(1-3)+, VIN(1-3)- - Differential Voltage Inputs

Differential analog input pins for voltage channels.

VREFOUT - Voltage Reference Output

The on-chip voltage reference is output from this pin. The voltage reference has a nominal magnitude of

1.2 V and is referenced to the AGND pin on the converter.

VREFIN - Voltage Reference Input

The voltage input to this pin establishes the voltage reference for the on-chip modulator.

Power Supply Connections

VA+ - Positive Analog Supply

The positive analog supply is nominally +3V ±10% relative to AGND.

VA- - Negative Analog Supply

The negative analog supply is nominally - 2V ±10% relative to AGND.

AGND - Analog Ground

The analog ground pin for input signals.

VD+ - Positive Digital Supply

The positive digital supply is nominally +3V ±10% relative to DGND.

DGND - Digital Ground

The digital ground is typically at the same level as AGND.

CPD - Charge Pump Drive

This output pin drives the external charge pump circuitry to create a negative supply voltage.