CS5181

16

DS250PP1

Supply Inputs

VA1+, VA2+ — Positive Analog Supply

Input for the positive analog supply is +5.0 V typical when AGND is 0 V.

AGND — Analog Ground

Analog ground for circuits supplied by VA+.

VD1+, VD2+ — Positive Digital Supply

Input for positive digital supply is +3.3 V typical when DGND is 0 V.

DGND — Digital Ground

Digital ground for circuits supplied by VD+.

Signal and Reference Related Inputs

AIN+, AIN- — Differential Analog Inputs

Fully differential signal inputs.

VREFIN — Voltage Reference Input

VREFOUT or an external reference is connected to VREFIN. Analog input voltage (full scale

fully differential peak-to-peak) into the converter is 1.6 times this value.

VREF+ — Positive Voltage Reference

Filter capacitor connection for the reference input buffer. The voltage on this pin equals

VREFIN X 1.6.

VREF- — Negative Voltage Reference

VREF- is connected to AGND.

VREFOUT — Voltage Reference Output

Output pin for the 2.375 volt on-chip reference relative to AGND.

VREFCAP — Reference Bypass

Filter capacitor connection for internal reference.

Serial Interface I/O Signals

SCLK, SCLK — Serial Interface Clock

Serial Clock Output. A gated serial clock output from the converter at a rate equal to 1/3 the

MCLK clock rate. The SCLK output is a complement of SCLK and helps reduce radiated

noise if the two lines are run adjacent on the PC board layout and drive a balanced load.