MAX11331 datasheet(28/37 Pages) MAXIM

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�� Maxim Integrated Products 28

MAX11329–MAX11332

3Msps, 12-/10-Bit, 8-/16-Channel ADCs with

Post-Mux External Signal Conditioning Access

Table 8. Analog Input Configuration and Unipolar/Bipolar Waveforms

Table 9. ADC Output as a Function of Unipolar/Bipolar Register Settings

CHANNEL SELECTION

UNIPOLAR REGISTER

BIPOLAR REGISTER

FUNCTION

BIT NAME

UCH0/1

PDIFF�COM

BCH0/1

AIN0 Selection:

CHSEL[3:0] = 0000

CHSCAN0 = 1

AIN0 (binary, unipolar)

AIN0/1 pair (two’s complement, bipolar)

AIN0/1 pair (binary, unipolar)

AIN0/1 pair (binary, unipolar); Unipolar register

takes precedence

AIN0 referred to REF-/AIN15 (binary, unipolar)

AIN1 Selection:

CHSEL[3:0] = 0001

CHSCAN1 = 1

AIN1 (binary, unipolar)

AIN0/1 pair (two’s complement, bipolar)

AIN0/1 pair (binary, unipolar)

AIN0/1 pair (binary, unipolar), Unipolar register

takes precedence

AIN1 referred to REF-/AIN15 (binary, unipolar)

ANALOG INPUT

CONFIGURATION

SUPPORTED WAVEFORMS

UNIPOLAR/BIPOLAR

REFSEL = 0

REFSEL = 1

Single-

Ended

Unipolar

(Binary

Coding)

Table 10. Unipolar Register:

Set desired channel(s) to 0

or PDIFF_COM to 1.

Counterpart Register

Table 11. Bipolar Register:

Set desired channel(s) to 0.

Fully

Differential

Unipolar

(Binary

Coding)

Table 10. Unipolar Register:

Set desired channel(s) to 1.

Counterpart Register

Table 11. Bipolar Register:

Set desired channel(s) to 0.

Fully

Differential

Bipolar

(2’s

Complement)

Table 11. Bipolar Register:

Set desired channel(s) to 1.

Counterpart Register

Table 10. Unipolar Register:

Set desired channel(s) to 0.

REF+

REF-

VIN+

VIN-

GND

REF+

RANGE: 1V TO VDD

REF+

RANGE: 1V TO VDD

-0.3V

REF+

VIN+

REF+

REF-

VIN+

GND, AIN15

PDIFF_COM = 1

REF+

RANGE: 1V TO VDD

REF+

RANGE: 1V TO VDD

-0.3V

REF+

VIN+

REF+

REF-

VIN+

VIN-

GND

REF+

RANGE: 1V TO VDD

REF+

RANGE: 1V TO VDD

-0.3V

REF+

VIN+

VIN-

(DC OFFSET

SINUSOID)

VIN-

(DC OFFSET

SINUSOID)

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