ADM208AN 데이터 시트보기 (PDF) - Analog Devices
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ADM208AN Datasheet PDF : 12 Pages
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FEATURES
0.1 F to 10 F Capacitors
120 kB/s Data Rate
2 Receivers Active in Shutdown (ADM213)
On-Board DC-DC Converters
؎9 V Output Swing with +5 V Supply
Low Power (15 mW)
Low Power Shutdown ≤5 W
؎30 V Receiver Input Levels
Latch-Up FREE
Plug-In Upgrade for MAX205-211/213
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
0.1 F, +5 V Powered
CMOS RS-232 Drivers/Receivers
ADM205–ADM211/ADM213
TYPICAL OPERATING CIRCUIT
0.1µF
16V
0.1µF
16V
TTL/CMOS
INPUTS*
TTL/CMOS
OUTPUTS
T1 IN
T2 IN
T3 IN
T4 IN
R1 OUT
R2 OUT
R3 OUT
R4 OUT
R5 OUT
EN
+5V INPUT
12 C1+
14 C1–
+5V TO +10V
VOLTAGE
DOUBLER
VCC 11
V+ 13
15 C2+
16 C2–
+10V TO –10V
VOLTAGE
INVERTER
V– 17
0.1µF
6.3V
0.1µF
16V
0.1µF
7
T1
2
6
T2
3
20
T3
1
21
T4
28
8
R1
9
5
R2
4
26
R3
27
22
R4
23
19
R5 18
24
GND ADM211 25
10
T1 OUT
T2 OUT
T3 OUT
RS-232
OUTPUTS
T4 OUT
R1 IN
R2 IN
R3 IN
R4 IN
R5 IN
RS-232
INPUTS**
SD
*INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT
**INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
GENERAL DESCRIPTION
The ADM2xx family of line drivers/receivers is intended for all
EIA-232-E and V.28 communications interfaces, especially in
applications where ± 12 V is not available. The ADM205,
ADM206, ADM211 and ADM213 feature a low power shut-
down mode which reduces power dissipation to less than 5 µW
making them ideally suited for battery powered equipment. The
ADM205 does not require any external components and is par-
ticularly useful in applications where printed circuit board space
is critical. The ADM213 has an active-low shutdown and an
active-high receiver enable control. Two receivers of the
ADM213 remain active during shutdown. This feature is useful
for ring indicator monitoring.
All members of the ADM2xx family, except the ADM209, in-
clude two internal charge pump voltage converters which allow
operation from a single +5 V supply. These converters convert
the +5 V input power to the ± 10 V required for RS-232 output
levels. The ADM209 is designed to operate from +5 V and
+12 V supplies. An internal +12 V to –12 V charge pump volt-
age converter generates the –12 V supply.
Table I. Selection Table
Part
Power
Number Supply Voltage
No. of No. of
RS-232 RS-232 External
Drivers Receivers Capacitors
ADM205 +5 V
5
5
ADM206 +5 V
4
3
ADM207 +5 V
5
3
ADM208 +5 V
4
4
ADM209 +5 V & +9 V to +13.2 V 3
5
ADM211 +5 V
4
5
ADM213 +5 V
4
5
None
4
4
4
2
4
4
Low Power
Shutdown
(SD)
Yes
Yes
No
No
No
Yes
Yes (SD)
TTL
Three-State
EN
Yes
Yes
No
No
Yes
Yes
Yes (EN)
No. of Receivers
Active in
Shutdown
0
0
0
0
0
0
2
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1994
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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