ADM1485ARMZ datasheet(4/11 Pages) AD

tên linh kiện	ADM1485ARMZ

Giải thích chi tiết về linh kiện	5 V Low Power EIA RS-485 Transceiver

PDF	11 Pages

Scroll/Zoom	100%

nhà sản xuất	AD [Analog Devices]

Trang chủ	http://www.analog.com

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4 / 11 page

REV.

–4–

ADM1485

Test Circuits

VOD

VOC

Test Circuit 1. Driver Voltage Measurement

VOD3

375

VTST

Test Circuit 2. Driver Voltage Measurement

RLDIFF

CL1

CL2

Test Circuit 3. Driver Propagation Delay

0V OR 3V

DE IN

VOUT

VCC

Test Circuit 4. Driver Enable/Disable

VOUT

Test Circuit 5. Receiver Propagation Delay

+1.5V

RE IN

VOUT

VCC

–1.5V

Test Circuit 6. Receiver Enable/Disable

Switching Characteristics

–VO

90% POINT

10% POINT

tSKEW = tPLH – tPHL

1/2VO

tPLH

1.5V

tPHL

90% POINT

10% POINT

Figure 1. Driver Propagation Delay, Rise/Fall Timing

A, B

1.5V

2.3V

tZH

tZL

1.5V

VOL

VOH

VOL + 0.5V

VOH – 0.5V

tHZ

tLZ

Figure 2. Driver Enable/Disable Timing

A, B

tPLH

1.5V

tPHL

1.5V

VOH

VOL

tSKEW = tPLH – tPHL

Figure 3. Receiver Propagation Delay

1.5V

tZH

tZL

1.5V

VOL

VOH

VOL + 0.5V

VOH – 0.5V

tHZ

tLZ

O/P LOW

O/P HIGH

Figure 4. Receiver Enable/Disable Timing

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