ADM3485E
Rev. D | Page 6 of 16
PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS
RO
1
RE
2
DE
3
DI
4
V
CC
8
B
7
A
6
GND
5
ADM3485E
TOP VIEW
(Not to Scale)
03338-002
Figure 2. SOIC_N Pin Configuration (R-8)
Table 5. Pin Function Descriptions
Mnemonic
Pin
Number
Description
RO 1 Receiver Output. When enabled, if A > B by 200 mV, then RO = high. If A < B by 200 mV, then RO = low.
RE
2
Receiver Output Enable. With RE low, the receiver output (RO) is enabled. With RE high, the output goes into a
high impedance state. If RE is high and DE is low, the ADM3485E enters a shutdown state.
DE 3
Driver Output Enable. A high level enables the driver differential outputs A and B. A low level places it in a high
impedance state.
DI 4
Driver Input. When the driver is enabled, a logic low on DI forces A low and B high, while a logic high on DI
forces A high and B low.
GND 5 Ground Connection, 0 V.
A 6 Noninverting Receiver Input A/Driver Output A.
B 7 Inverting Receiver Input B/Driver Output B.
V
CC
8 Power Supply, 3.3 V ± 0.3 V.
ADM3485E
Rev. D | Page 7 of 16
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
V
OC
R
L
/2
R
L
/2
B
A
V
OD
03338-037
Figure 3. Driver Differential Output Voltage and
Common-Mode Output Voltage
R
L
375
375
V
OD
V
CM
=
–7V TO +12V
D
V
CC
03338-038
Figure 4. Driver Differential Output Voltage with
Varying Common-Mode Voltage
V
OH
I
OH
(–)
V
ID
R
0
I
OL
(+)
V
OL
03338-039
Figure 5. Receiver Output Voltage High and Output Voltage Low
IN
OUT
+1.5V +1.5V
+3V
0V
≈ +2V
≈ –2V
t
DD
t
DD
t
TD
t
TD
50%50%
10%10%
90%90%
D
GENERATOR
1
V
CC
50
C
L
R
L
=
60
C
L
= 15pF
2
OUT
1
PPR = 250kHz, 50% DUTY CYCLE,
t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-040
Figure 6. Driver Differential Output Delay and Transition Times
Figure 7. Driver Propagation Delays
D
OUT
C
L
= 50pF
2
GENERATOR
1
50
S1
V
OM
=
V
OH
+ V
OL
2
≈ 1.5V
R
L
= 110
0V OR 3V
1
PPR = 250kHz, 50% DUTY CYCLE, t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
0V
V
OH
0V
3V
1.5V1.5V
0.25V
IN
OUT
V
OM
t
PZH
t
PHZ
03338-042
Figure 8. Driver Enable and Disable Times (t
PZH
, t
PSH
, t
PHZ
)
ADM3485E
Rev. D | Page 8 of 16
V
OL
V
CC
0V
3V
0.25V
IN
OUT
1.5V 1.5V
t
PSL
t
PLZ
V
OM
D
OUT
C
L
= 50pF
2
GENERATOR
1
50
S1
0V OR 3V
V
CC
R
L
= 110
1
PPR = 250kHz, 50% DUTY CYCLE,
t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-043
Figure 9. Driver Enable and Disable Times (t
PZL
, t
PSL
, t
PLZ
)
3V
0V
V
CC
0V
IN
OUT
V
OM
V
OM
1.5V1.5V
t
RPHL
t
RPLH
GENERATOR
1
50
C
L
= 15pF
2
R
1.5V
0V
V
OM
=
V
CC
2
OUT
V
ID
1
PPR = 250kHz, 50% DUTY CYCLE,
t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-044
Figure 10. Receiver Propagation Delays
+3V
0V
V
OH
0V
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 C
LOSED
S2 OPEN
S3 = –1.5V
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = –1.5V
+3V
0V
V
CC
V
OL
+3V
0V
V
CC
V
OL
+3V
0V
V
OH
0V
+1.5V
+1.5V
+1.5V
IN
OUT
IN
OUT
IN
OUT
IN
OUT
t
RPZL
t
RPSL
t
RPLZ
t
RPHZ
+0.25V
+0.25V
+1.5V
+1.5V
+1.5V
t
RPZH
t
RPSH
R
GENERATOR
1
50
C
L
2
S3
S1
S2
V
CC
+1.5V
–1.5V
V
ID
1k
1
PPR = 250kHz, 50% DUTY CYCLE,
t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-045
Figure 11. Receiver Enable and Disable Times

ADM3485EARZ-REEL7

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 3.3V 15kV ESD Half Duplex 12Mbps
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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