MAX489 datasheet(9/18 Pages) TGS

Part #	MAX489

Description	LOW-POWER SLEW-RATE-LIMITED RS-485/422 TRANSCEIVERS

PDF	18 Pages

Scroll/Zoom	100%

Manufacturer	TGS [Tiger Electronic Co.,Ltd]

Direct Link	http://www.tgselec.com

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9 / 18 page

Test Circuits

RECEIVER

OUTPUT

TEST POINT

1kΩ

VCC

VOD

VOC

CRL

15pF

1kΩ

Figure 4. Driver DC Test Load

Figure 5. Receiver Timing Test Load

VID

CL1

RDIFF

OUTPUT

UNDER TEST

500Ω

VCC

CL2

Figure 6. Driver/Receiver Timing Test Circuit

Figure 7. Driver Timing Test Load

MAX483/MAX487/MAX488/MAX489:

Reduced EMI and Reflections

The MAX483 and MAX487–MAX489 are slew-rate limit-

ed, minimizing EMI and reducing reflections caused by

improperly terminated cables. Figure 12 shows the dri-

ver output waveform and its Fourier analysis of a

150kHz signal transmitted by a MAX481, MAX485,

MAX490, MAX491, or MAX1487. High-frequency har-

monics with large amplitudes are evident. Figure 13

shows the same information displayed for a MAX483,

MAX487, MAX488, or MAX489 transmitting under the

same conditions. Figure 13’s high-frequency harmonics

have much lower amplitudes, and the potential for EMI

is significantly reduced.

MAX489 Datasheet(PDF) 9 Page - Tiger Electronic Co.,Ltd