MAX198ACAI-T 데이터 시트보기 (PDF) - Maxim Integrated

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MAX198ACAI-T

Multirange, Single +5V, 12-Bit DAS with 12-Bit Bus Interface

Maxim Integrated 

Multirange, Single +5V, 12-Bit DAS

with 12-Bit Bus Interface

Layout, Grounding, and Bypassing

Careful printed circuit board layout is essential for best

system performance. For best performance, use a

ground plane. To reduce crosstalk and noise injection,

keep analog and digital signals separate. Digital

ground lines can run between digital signal lines to

minimize interference. Connect analog grounds and

DGND in a star configuration to AGND. For noise-free

operation, ensure the ground return from AGND to the

supply ground is low impedance and as short as possi-

ble. Connect the logic grounds directly to the supply

ground. Bypass VDD with 0.1µF and 4.7µF capacitors

to AGND to minimize high- and low-frequency fluctua-

tions. If the supply is excessively noisy, connect a 5Ω

resistor between the supply and VDD, as shown in

Figure 12.

SUPPLY

+5V

GND

R* = 5Ω

4.7µF

0.1µF

**

VDD

AGND

MAX196

MAX198

DGND

+5V DGND

DIGITAL

CIRCUITRY

* OPTIONAL

** CONNECT AGND AND DGND WITH A GROUND PLANE OR A SHORT TRACE

Figure 12. Power-Supply Grounding Connection

_________________________________________________________Functional Diagram

REF

REFADJ

CH5

SIGNAL

CH4

CONDITIONING

CH3

BLOCK

CH2

&

OVERVOLTAGE

CH1

TOLERANT

CH0

MUX

AV =

1.638

T/H

CHARGE REDISTRIBUTION

12-BIT DAC

10k

+2.5V

REFERENCE

COMP

CLK

CLOCK

CS

CONTROL LOGIC

WR

&

RD

LATCHES

12

SUCCESSIVE-

APPROXIMATION

REGISTER

8

12

MAX196

VDD

INT

THREE-STATE, BIDIRECTIONAL

I/O INTERFACE

MAX198

AGND

DGND

D0–D11

12-BIT DATA BUS

______________________________________________________________________________________ 15

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