LTC2858IMS-1(RevB) Ver la hoja de datos (PDF) - Linear Technology

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LTC2858IMS-1
(Rev.:RevB)

20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers

Linear Technology 

TEST CIRCUITS

Y

GND DI

+

OR

VCC

DRIVER

V–OD

Z

R

R+

V–OC

285678 F01

Figure 1. Driver DC Characteristics

LTC2856-1/LTC2856-2

LTC2857-1/LTC2857-2

LTC2858-1/LTC2858-2

Y

GND DI

OR

DRIVER

VCC

Z

IOSD

+

–

–7V TO +12V

285678 F02

Figure 2. Driver Output Short-Circuit Current

IIN

A OR B

VIN +–

RECEIVER

B OR A

285678 F03

RIN

=

VIN

IIN

Figure 3. Receiver Input Current and Input Resistance

Y

DI

DRIVER

Z

CL

RDIFF

CL

285678 F04a

VCC

DI

0V

Y, Z VO

tPLHD,

tPLHDS

1/2 VO

tPHLD,

tPHLDS

tSKEWD,tSKEWDS

90%

90%

Y-Z

10% 0

0 10%

tRD,

tRDS

285678 F04b

tFD,

tFDS

Figure 4. Driver Timing Measurement

Y

VCC DI

OR

DRIVER

GND

DE

Z

RL

GND

OR

CL

VCC

RL

CL

VCC

OR

GND

285678 F05a

VCC

DE

0V

VCC

Y OR Z

VOL

VOH

Z OR Y

0V

1/2 VCC

tZLD,

tZLDS,

tZLSD,

tZLSDS

VO

1/2 VCC

1/2 VCC

tZHD,

tZHDS,

tZHSD,

tZHSDS

Figure 5. Driver Enable and Disable Timing Measurement

tLZD,

tLZDS

0.5V

0.5V

tHZD,

tHZDS,

tSHDN,

tSHDNS

285678 F05b

285678fb

5

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