MAX1245ACAP(2009) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1245ACAP
(Rev.:2009)

+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)

START

BIT

7(MSB)

6

5

4

3

2

1

0(LSB)

BIT 6

SEL2

NAME

START

SEL2

SEL1

SEL0

UNI/BIP

SGL/DIF

PD1

PD0

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

(LSB)

SEL1

SEL0

UNI/BIP

SGL/DIF

PD1

PD0

DESCRIPTION

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

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

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.

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).

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

0

1

SEL1

0

0

0

0

1

1

1

1

SEL0

0

0

1

1

0

0

1

1

CH0

+

CH1

+

CH2

+

CH3

CH4

+

+

CH5

+

CH6

+

CH7

+

COM

–

–

–

–

–

–

–

–

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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