Datasheet

REV. 0

AD7708/AD7718

–23–

Table XI. Registers—Quick Reference Guide

Power-On/Reset

Communications Write Only 8 Bits Not Applicable All operations to other registers are initiated through

the Communications Register. This controls whether

subsequent operations are read or write operations

and also selects the register for that subsequent

operation.

Status Register Read Only 8 Bits 00 Hex Provides status information on conversions, calibra-

tions and error conditions.

Mode Register Read/Write 8 Bits 00 Hex Controls functions such as mode of operation, chan-

nel configuration, oscillator operation in power-down.

ADC (ADCCON)

Control Register Read/Write 8 Bits 07 Hex This register is used to select the active channel

input, configure the operating input range, and select

unipolar or bipolar operation.

I/O (IOCON)

I/O Control Register Read/Write 8 Bits 00 Hex This register is used to control and configure the

I/O port.

Filter Register Read/Write 8 Bits 45 Hex This register determines the amount of averaging

performed by the sinc filter and consequently deter-

mines the data update rate of the AD7708/AD7718.

The filter register determines the update rate for

operation with CHOP enabled and CHOP disabled.

AD7718 ADC (DATA)

Data Register Read Only 24 Bits 000000 Hex Provides the most up-to-date conversion result for

the selected channel on the AD7718.

AD7708 (DATA)

Data Register Read Only 16 Bits 0000 Hex Provides the most up-to-date conversion result for

the selected channel on the AD7708.

BSMBSL

YDR0 LAC0RRE00 KCOL

BSMBSL

3HC2HC1HC0HC/U B 2NR1NR0NR

BSMBSL

7FS6FS5FS4FS3FS2FS1FS0FS

BSMBSL

00 RID2PRID1P00 TAD2PTAD1P

CR7 CR6 CR5 CR4 CR3 CR2 CR1 CR0

WEN R/W 0(0) 0(0) A3(0) A2(0) A1(0) A0(0)

MSB LSB

CHOP NEGBUF REFSEL CHCON OSCPD MD2 MD1 MD0