MAX1202ACAP 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1202ACAP

5V, 8-Channel, Serial, 12-Bit ADCs with 3V Digital Interface

Maxim Integrated 

MAX1202/MAX1203

5V, 8-Channel, Serial, 12-Bit ADCs

with 3V Digital Interface

Table 2. Control-Byte Format

BIT 7

(MSB)

START

BIT 6

SEL 2

BIT 5

SEL 1

BIT 4

SEL 0

BIT 3

UNI/BIP

BIT 2

SGL/DIF

BIT1

PD1

BIT 0 (LSB)

PD0

BIT

7 (MSB)

6

5

4

3

2

NAME

START

SEL2

SEL1

SEL0

UNI/BIP

SGL/DIF

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 is used for the conversion

(Tables 3 and 4).

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

input signal from 0 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 GND. In differential mode, the voltage difference

between two channels is measured. (Tables 3 and 4).

1

0 (LSB)

Selects clock and power-down modes.

PD1 PD0 Mode

PD1

0

0

Full power-down (IDD = 2µA, internal reference)

PD0

0

1

Fast power-down (IDD = 30µA, internal reference)

1

0

Internal clock mode

1

1

External clock mode

Table 3. 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

+

+

+

Table 4. 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

+

-

-

+

CH7

+

CH6

+

-

GND

-

-

-

-

-

-

-

-

CH7

-

+

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