Cirrus Logic CS5534-BS - Manual (Page 45)

CS5532/34-BS
DS755F3 45
SDI - Serial Data Input.
SDI is the input pin of the serial input port. Data will be input at a rate determined by SCLK.
SDO - Serial Data Output.
SDO is the serial data output. It will output a high impedance state if CS = 1.
SCLK - Serial Clock Input.
A clock signal on this pin determines the input/output rate of the data for the SDI/SDO pins
respectively. This input is a Schmitt trigger to allow for slow rise time signals. The SCLK pin
will recognize clocks only when CS is low.
A0 - Logic Output (Analog)/Guard, A1 - Logic Output (Analog).
The logic states of A1-A0 mimic the OL1-OL0 bits in the selected Setup, or the A1-A0 bits in
the Configuration Register, depending on the state of the OLS bit in the Configuration Register.
Logic Output 0 = VA-, and Logic Output 1 = VA+. Alternately, A0 can be used as a guard drive
for the instrumentation amplifier with proper setting of the GB bit in the Configuration Register.
Measurement and Reference Inputs
AIN1+, AIN1-, AIN2+, AIN2- AIN3+, AIN3-, AIN4+, AIN4- - Differential Analog Input.
Differential input pins into the device.
VREF+, VREF- - Voltage Reference Input.
Fully differential inputs which establish the voltage reference for the on-chip modulator.
C1, C2 - Amplifier Capacitor Inputs.
Connections for the instrumentation amplifier’s capacitor.
Power Supply Connections
VA+ - Positive Analog Power.
Positive analog supply voltage.
VD+ - Positive Digital Power.
Positive digital supply voltage (nominally +3.0 V or +5 V).
VA- - Negative Analog Power.
Negative analog supply voltage.
DGND - Digital Ground.
Digital Ground.