AD7306

REV. D

–5–

t

PHL

t

PLH

1.5V

1.5V

90% POINT

10% POINT

3V

0V

VO

VO

0V

–VO

1/2 VO

t

SKEW

t

R

90% POINT

10% POINT

T3

(B)

OUT

OUT

T3

(A)

Figure 4. RS-422 Driver. Propagation Delay Rise/Fall

Timing

t

PLH

t

PHL

2.5V

–2.5V

0V

0V

DIFFERENTIAL

INPUT

R1

(B) - R1

(A)

IN

IN

Figure 5. RS-422 Receiver Timing

t

EN1

1.5V

1.5V

232/422 SEL

RS-232

RS-422

RS-232

Figure 6. RS-232/RS-422 Receiver Enable Timing

R1

(B)

IN

±10V

POWER

SUPPLY

GENERATOR

AD7306

R1

RS-232

INPUT

RS-232

OUTPUTS

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

232/422 SEL

T3

(B)

OUT

T3

(A)

OUT

RS-422

OUTPUT

RS-232/

RS-422

INPUT

RS-422

INPUT

8

9

15

17

R2

21

4

T3

7

2

3

23

22

24

1

0.1

µF

0.1

µF

0.1

µF

0.1

µF

+5V INPUT

V+

C1+

C1–

11

10

16

19

6

C2–

C2+

V–

T2

T1

20

5

0.1

µF

14

18

Figure 1. AD7306 Application Circuit

T3

C

= 100pF

L1

T3

(B)

OUT

RL

= 100

Ω

DIFF

OUT

T3

(A)

C

= 100pF

L2

Figure 2. RS-422 Driver. Propagation Delay Test Circuit

T3

T3

(B)

OUT

OUT

T3

(A)

Figure 3. RS-422 Driver. Voltage Measurement Test

Circuit