ADS8345EB datasheet(11/26 Pages) TI2

11 / 26 page

ADS8345

SBAS177C

www.ti.com

FIGURE 2. Methods of Driving the ADS8345—Single-Ended

or Differential.

FIGURE 4. Simplified Diagram of the Analog Input.

FIGURE 3. Single-Ended Input—Common Voltage Range

vs VREF.

0.5

1.0

1.5

2.0

2.5

REF (V)

–1

2.8

2.1

CC = 5V

Single-Ended Input

0.1

4.9

Converter

+IN

–IN

CH0

CH1

CH2

CH3

A2-A0

(shown 00o

(1)

SGL/DIF

(shown HIGH)

CH4

CH5

CH6

CH7

COM

NOTE: (1) See Truth Tables, Table I,

and Table II for address coding.

FIGURE 5. Differential Input—Common Voltage Range vs VREF.

ADS8345

Single-Ended Input

CHX

COM

CHX+

CHX–

±V

REF

(1)

Differential Input

NOTE: (1) Relative to common-mode voltage.

Common-Mode

Voltage

Common-Mode

Voltage

(typically V

REF)

REF

(1)

REF

(1)

0.0

1.0

1.5

2.0

2.5

REF (V)

4.2

CC = 5V

0.8

5.2

Differential Input

0.2

REFERENCE INPUT

The external reference sets the analog input range. The

ADS8345 will operate with a reference in the range of 500mV

to +VCC/2. Keep in mind that the analog input is the differ-

ence between the CHX input and the COM input, as shown

in Figure 4. For example, in the single-ended mode, a 1.25V

reference with the COM pin at VCC/2, the selected input

channel (CH0-CH7) will properly digitize a signal in the range

of (VCC/2 – 1.25V) to (VCC/2 + 1.25V).

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