CS5525 CS5526
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.
DS202F3
25
CIRRUS [ CIRRUS LOGIC ]
