Datasheet

AD7306
REV. B
–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
t
F
t
SKEW
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
V
OL
V
OH
R1
OUT
DIFFERENTIAL
INPUT
R1 (B) - R1 (A)
IN IN
Figure 5. RS-422 Receiver Timing
t
EN2
t
EN1
1.5V 1.5V
V
OL
V
OH
R1
OUT
232/422 SEL
V
OL
V
OH
RS-232 RS-422
RS-232
Figure 6. RS-232/RS-422 Receiver Enable Timing
R1 (B)
IN
±10V
POWER
SUPPLY
GENERATOR
T2
OUT
T1
OUT
R2
OUT
R1
OUT
T1
IN
T2
IN
R2
IN
AD7306
R1
RS-232
INPUT
RS-232
OUTPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
T3
IN
232/422 SEL
T3 (B)
OUT
T3 (A)
OUT
RS-422
OUTPUT
RS-232/
RS-422
INPUT
RS-422
INPUT
R1
IN
/R1
IN
(A)
8
9
15
17
R2
21
4
T3
7
2
3
23
22
24
1
0.1µF
0.1µF
0.1µF
0.1µF
+5V INPUT
V
CC
V+
C1+
C1–
11
10
16
19
6
C2–
C2+
V–
T2
T1
20 5
0.1µF
1418
Figure 1. AD7306 Application Circuit
T3
C = 100pF
L1
T3 (B)
OUT
RL = 100Ω
DIFF
T3
IN
OUT
T3 (A)
C = 100pF
L2
Figure 2. RS-422 Driver. Propagation Delay Test Circuit
T3
T3 (B)
OUT
T3
IN
OUT
T3 (A)
RL
DIFF
V
OD
Figure 3. RS-422 Driver. Voltage Measurement Test
Circuit