CS5471

12

Measurement and Reference Input

IIN+, IIN- - Differential Current Input.

Differential analog input pins for current channel.

VIN+, VIN- - Differential Voltage Inputs.

Differential analog input pins for voltage channel.

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 +3 V ±10% relative to AGND.

VA- - Negative Analog Supply.

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

AGND - Analog Ground.

The analog ground pin for input signals.

VD+ - Positive Digital Supply.

The positive digital supply is nominally +3 V ±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.