THS1009

SLAS287A – AUGUST 2000 – REVISED DECEMBER 2002

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DIGITAL OUTPUT DATA FORMAT

The digital output data format of the THS1009 can either be in binary format or in twos complement format. The

following tables list the digital outputs for the analog input voltages.

Table 2. Binary Output Format for Single-Ended Configuration

SINGLE-ENDED, BINARY OUTPUT

ANALOG INPUT VOLTAGE

DIGITAL OUTPUT CODE

AIN = VREFP

3FFh

AIN = (VREFP + VREFM)/2

200h

AIN = VREFM

000h

Table 3. Twos Complement Output Format for Single-Ended Configuration

SINGLE-ENDED, TWOS COMPLEMENT

ANALOG INPUT VOLTAGE

DIGITAL OUTPUT CODE

AIN = VREFP

1FFh

AIN = (VREFP + VREFM)/2

000h

AIN = VREFM

200h

Table 4. Binary Output Format for Differential Configuration

DIFFERENTIAL, BINARY OUTPUT

ANALOG INPUT VOLTAGE

DIGITAL OUTPUT CODE

Vin = AINP – AINM

VREF = VREFP – VREFM

Vin = VREF

3FFh

Vin = 0

200h

Vin = –VREF

000h

Table 5. Twos Complement Output Format for Differential Configuration

DIFFERENTIAL, BINARY OUTPUT

ANALOG INPUT VOLTAGE

DIGITAL OUTPUT CODE

Vin = AINP – AINM

VREF = VREFP – VREFM

Vin = VREF

1FFh

Vin = 0

000h

Vin = –VREF

200h

ADC CONTROL REGISTER

The THS1009 contains two 10-bit wide control registers (CR0, CR1) in order to program the device into the desired

mode. The bit definitions of both control registers are shown in Table 6.

Table 6. Bit Definitions of Control Register CR0 and CR1

REG

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

CR0

TEST1

TEST0

SCAN

DIFF1

DIFF0

CHSEL1

CHSEL0

PD

RES

VREF

CR1

RESERVED

OFFSET

BIN/2’s

R/W

RES

RES

RES

RES

SRST

RESET