LTC1535

8

1535fb

TEST CIRCUIT

2

**

D

Y

Z

Y

Z

SLO

2

1

1

R

A

B

RO2

1535 F01

RO

RE

DE

DI

GND

LOGIC COMMON

2

2

FLOATING RS485 COMMON

** COOPER (888) 414-2645

SLOW SLEW

RATE JUMPER

420kHz

28

27

26

25

4

17

15

16

18

12

13

14

11

1

+

+

GND2

1/2 BAT54C

1/2 BAT54C

ST1

ST2

3

2

RO

1

10μF

10μF

2

CTX02-14659

C2

50pF

2

C1

50pF

BAUD

RATE

Figure 1. Self-Oscillation at Maximum Data Rate (Test Configuration for the First Six Typical Performance Characteristics Curves)

Y

Z

R

R

1535 F02

RECEIVER

OUTPUT

1k

S1

S2

TEST POINT

1k

1535 F03

3V

DE

Y

Z

DI

R

R

1535 F04

OUTPUT

UNDER TEST

S1

S2

500Ω

1535 F05

Figure 2. Driver DC Test Load

Figure 3. Receiver Timing Test Load

Figure 4. Driver Timing Test Circuit

Figure 5. Driver Timing Test Load