MAX127ACAI(2012) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX127ACAI
(Rev.:2012)

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

Maxim Integrated 

MAX127/MAX128

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

Table 1. Control-Byte Format

BIT 7

(MSB)

START

BIT 6

SEL2

BIT 5

SEL1

BIT 4

SEL0

BIT 3

RNG

BIT 2

BIP

BIT 1

PD1

BIT 0

PD0

BIT

7 (MSB)

6, 5, 4

3

2

1, 0 (LSB)

NAME

START

SEL2, SEL1,

SEL0

RNG

BIP

PD1, PD0

DESCRIPTION

The logic “1” received after acknowledge of a write bit (R/W = 0) defines the beginning of the

control byte.

These three bits select the desired “ON” channel (Table 2).

Selects the full-scale input voltage range (Table 3).

Selects unipolar or bipolar conversion mode (Table 3).

These two bits select the power-down modes (Table 4).

Table 2. Channel Selection

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

CHANNEL

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

Table 4. Power-Down and Clock Selection

PD1 PD0

SEL0

0

X Normal Operation (always on)

1

0

Standby Power-Down Mode (STBYPD)

1

1

Full Power-Down Mode (FULLPD)

Table 3. Range and Polarity Selection

INPUT RANGE (V)

MAX127

0 to 5

0 to 10

±5

±10

MAX128

0 to VREF/2

0 to VREF

±VREF/2

±VREF

RNG

BIP

0

0

1

0

0

1

1

1

0

0

1

0

0

1

1

1

NEGATIVE FULL

SCALE (V)

—

—

-VREF x 1.2207

-VREF x 2.4414

—

—

-VREF/2

-VREF

ZERO

SCALE (V)

0

0

0

0

0

0

0

0

FULL SCALE (V)

VREF x 1.2207

VREF x 2.4414

VREF x 1.2207

VREF x 2.4414

VREF/2

VREF

VREF/2

VREF

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