MAX1245ACAP Просмотр технического описания (PDF) - Maxim Integrated

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MAX1245ACAP

+2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC

Maxim Integrated 

+2.375V, Low-Power, 8-Channel,

Serial 12-Bit ADC

Table 1. Control-Byte Format

BIT 7

(MSB)

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

START

SEL2

SEL1

SEL0

UNI/BIP

SGL/DIF

PD1

PD0

BIT

7(MSB)

NAME

START

DESCRIPTION

The first logic “1” bit after CS goes low defines the beginning of the control byte.

6

SEL2

These three bits select which of the eight channels are used for the conversion (Tables 2 and 3).

5

SEL1

4

SEL0

3

UNI/BIP

1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an

analog input signal from 0V to VREF can be converted; in bipolar mode, the signal can range

from -VREF/2 to +VREF/2.

2

SGL/DIF

1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-

ended mode, input signal voltages are referred to COM. In differential mode, the voltage

difference between two channels is measured (Tables 2 and 3).

1

PD1

0(LSB)

PD0

Selects clock and power-down modes.

PD1

PD0

Mode

0

0

Power-down (IQ = 1.2µA)

0

1

Unassigned

1

0

Internal clock mode

1

1

External clock mode

Table 2. Channel Selection in Single-Ended Mode (SGL/DIF = 1)

SEL2

0

1

0

1

0

1

SEL1

0

0

0

0

1

1

SEL0

0

0

1

1

0

0

CH0

+

CH1

+

CH2

+

CH3

CH4

+

+

CH5

+

CH6

CH7

COM

–

–

–

–

–

–

0

1

1

1

1

1

+

–

+

–

Table 3. Channel Selection in Differential Mode (SGL/DIF = 0)

SEL2

0

0

0

0

1

1

1

1

SEL1

0

0

1

1

0

0

1

1

SEL0

0

1

0

1

0

1

0

1

CH0

+

–

CH1

–

+

CH2

+

–

CH3

–

+

CH4

+

–

CH5

–

+

CH6

CH7

+

–

–

+

10 ______________________________________________________________________________________

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