Rainbow-electronics MAX1402 Manual de usuario descargar pdf (Pagina 37)

MAX1402

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

______________________________________________________________________________________ 37

Figure 20. 4-Wire RTD Application

V+

200µA

+5V

OUT2

REFIN+

AIN1

AIN2

AGND

DGND

PGA

MODULATOR

A = 1 TO 128

200µA

RTD

REF

REFIN-

OUT1

MAX1402

board is dedicated to ground planes while signals are

placed on the solder side.

Good decoupling is important when using high-resolu-

tion ADCs. Decouple all analog supplies with 10µF tan-

talum capacitors in parallel with 0.1µF HF ceramic

capacitors to AGND. Place these components as close

to the device as possible to achieve the best decou-

pling.

See the MAX1402 evaluation kit manual for the recom-

mended layout. The evaluation board package includes

a fully assembled and tested evaluation board.

Optical Isolation

For applications that require an optically isolated

interface, refer to Figure 21. With 6N136-type optocou-

plers, maximum clock speed is 4MHz. Maximum clock

speed is limited by the degree of mismatch between

the individual optocouplers. Faster optocouplers allow

faster signaling at a higher cost.

6N136

MOSI

470Ω

SCK

MISO

INT

470Ω

INT

ISO

+5V

DOUT

SCLK

DIN

MAX1402

Figure 21. Optically Isolated Interface

1 2 ... 32 33 34 35 36 37 38 39 40

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