Rainbow-electronics MAX1301 Manual do Utilizador descarregar pdf (Página 13)

Detailed Description

The MAX1300/MAX1301 multirange, low-power, 16-bit

successive-approximation ADCs operate from a single

+5V supply and have a separate digital supply allowing

digital interface with 2.7V to 5.25V systems. These 16-bit

ADCs have internal track-and-hold (T/H) circuitry that

supports single-ended and fully differential inputs. For

single-ended conversions, the valid analog input voltage

range spans from -12V below ground to +12V above

ground. The maximum allowable differential input volt-

age spans from -24V to +24V. Data can be converted in

a variety of software-programmable channel and data-

acquisition configurations. Microprocessor (µP) control is

made easy through an SPI-/QSPI-/MICROWIRE-compati-

ble serial interface.

The MAX1300 has eight single-ended analog input

channels or four differential channels (see the Block

Diagram at the end of the data sheet). The MAX1301

has four single-ended analog input channels or two dif-

ferential channels. Each analog input channel is inde-

pendently software programmable for seven

single-ended input ranges (0 to +6V, -6V to 0, 0 to

+12V, -12V to 0, ±3V, ±6V, and ±12V) and three differ-

ential input ranges (±6V, ±12V, and ±24V).

Additionally, all analog input channels are fault tolerant

to ±16.5V. A fault condition on an idle channel does not

affect the conversion result of other channels.

MAX1300/MAX1301

8-/4-Channel, ±12V Multirange Inputs,

Serial 16-Bit ADCs

______________________________________________________________________________________ 13

Pin Description (continued)

MAX1300

MAX1301

NAME

FUNCTION

21 18

AGND3

Analog Signal Ground 3. AGND3 is the ADC negative reference potential. Connect AGND3 to

AGND1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

22 19

DD2

Analog Supply Voltage 2. Connect AV

DD2

to a +4.75V to +5.25V power-supply voltage. Bypass

DD2

to AGND2 with a 0.1µF capacitor.

23 20

AGND2

Analog Ground 2. This ground carries approximately five times more current than AGND1.

DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

24 1

AGND1

Analog Ground 1. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.

4–20mA

PLC

ACCELERATION

PRESSURE

TEMPERATURE

WHEATESTONE

1µF

0.1µF

AGND2

DGNDOAGND3 DGND

DD2

DD1

0.1µF 0.1µF 0.1µF

5.0V 5.0V 5.0V

MAX1300

CHO

CH1

CH2

CH3

CH4

CH5

CH6

CH7

REF

AGND1

REFCAP

0.1µF

3.3V

MC68HCXX

µC

DDO

SCLK

DIN

SSTRB

DOUT

SCK

I/O

MOSI

I/O

MISO

Figure 1. Typical Application Circuit

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 30 31

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