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ADM213 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM213
Beschreibung 5V Powered CMOS RS-232 Drivers/Receivers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADM213 Datasheet, Funktion
0.1 μF, 5 V Powered CMOS
RS-232 Drivers/Receivers
ADM206/ADM207/ADM208/ADM211/ADM213
FEATURES
0.1 μF to 10 μF capacitors
120 kB/s data rate
Two receivers active in shutdown (ADM213)
On-board dc-to-dc converters
±9 V output swing with 5 V supply
Low power (15 mW)
Low power shutdown ≤ 5 μW
±30 V receiver input levels
Latch-up free
Pin compatible to MAX206-211/213
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
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 ADM206,
ADM211, and ADM213 feature a low power shutdown mode
that reduces power dissipation to less than 5 μW, making them
ideally suited for battery-powered equipment. The ADM213 has
an active low shutdown and an active high receiver-enable
TYPICAL OPERATING CIRCUIT
5V INPUT
0.1μF +
16V
0.1μF +
16V
12 C1+
14 C1–
+5V TO +10V
VOLTAGE
DOUBLER
VCC 11
V+ 13
15 C2+ +10V TO –10V
VOLTAGE
16 C2– INVERTER
V– 17
0.1μF
+ 6.3V
+
0.1μF
0.1μF
+ 16V
T1IN
7
T1
2 T1OUT
TTL/CMOS
INPUTS1
T2IN
T3IN
6
20
T2
T3
3 T2OUT
RS-232
1 T3OUT OUTPUTS
T4IN
21
T4
28 T4OUT
R1OUT
8
R1 9 R1IN
R2OUT
TTL/CMOS
OUTPUTS
R3OUT
R4OUT
5
26
22
R2 4 R2IN
R3
27
R3IN
RS-232
INPUTS2
R4 23 R4IN
R5OUT
EN
19
24
R5 18
GND
10
ADM211
25
R5IN
SD
NOTES
1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2INTERNAL 5kΩ PULL-DOWN RESIST OR ON EACH RS-232 INPUT.
Figure 1.
control. Two receivers of the ADM213 remain active during
shutdown. This feature is useful for ring indicator monitoring.
All members of the ADM2xx family include two internal charge
pump voltage converters that allow operation from a single 5 V
supply. These parts convert the 5 V input power to the ±10 V
required for RS-232 output levels.
Table 1. Selection Table
Part
Number
Power Supply
Voltage
ADM206
ADM207
ADM208
ADM211
ADM213
5V
5V
5V
5V
5V
Number of RS-
232 Drivers
4
5
4
4
4
Number of
RS-232 Receivers
3
3
4
5
5
External
Capacitors
4
4
4
4
4
Low Power
Shutdown (SD)
Yes
No
No
Yes
Yes (SD)
TTL Three-
State EN
Yes
No
No
Yes
Yes (EN)
Number of Receivers
Active in Shutdown
0
0
0
0
2
Rev. D
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.






ADM213 Datasheet, Funktion
ADM206/ADM207/ADM208/ADM211/ADM213
T2OUT 1
24 T3OUT
T1OUT 2
23 R3IN
R2IN 3
22 R3OUT
R2OUT 4
21 T4IN
T1IN
R1OUT
R1IN
5 ADM208 20 T4OUT
6 TOP VIEW 19 T3IN
7 (Not to Scale) 18 T2IN
GND 8
17 R4OUT
VCC 9
16 R4IN
C1+ 10
15 V–
V+ 11
14 C2–
C1– 12
13 C2+
Figure 6. ADM208 PDIP/SOIC/SSOP Pin Configuration
5V INPUT
+
0.1μF
6.3V
+
0.1μF
16V
10 C1+
12 C1–
+5V TO +10V
VOLTAGE
DOUBLER
VCC 9
V+ 11
13 C2+ +10V TO –10V
VOLTAGE
14 C2– INVERTER
V– 15
0.1μF
+ 6.3V
+
0.1μF
0.1μF
+ 16V
T1IN
TTL/CMOS
INPUTS1
T2IN
T3IN
T4IN
R1OUT
TTL/CMOS
OUTPUTS
R2OUT
R3OUT
R4OUT
5
18
19
21
6
4
22
17
T1 2
T2 1
T3 24
T4 20
R1 7
R2 3
R3 23
R4 16
GND ADM208
8
T1OUT
T2OUT
T3OUT
RS-232
OUTPUTS
T4OUT
R1IN
R2IN
R3IN
RS-232
INPUTS2
R4IN
NOTES
1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 7. ADM208 Typical Operating Circuit
T3OUT 1
28 T4OUT
T1OUT 2
27 R3IN
T2OUT 3
26 R3OUT
R2IN 4
25 SD
R2OUT 5
24 EN
T2IN
T1IN
R1OUT
6 ADM211 23 R4IN
7 TOP VIEW 22 R4OUT
8 (Not to Scale) 21 T4IN
R1IN 9
20 T3IN
GND 10
19 R5OUT
VCC 11
18 R5IN
C1+ 12
17 V–
V+ 13
16 C2–
C1– 14
15 C2+
Figure 8. ADM211 SOIC/SSOP Pin Configuration
5V INPUT
+
0.1μF
16V
+
0.1μF
16V
12 C1+
14 C1–
+5V TO +10V
VOLTAGE
DOUBLER
VCC 11
V+ 13
15 C2+ +10V TO –10V
VOLTAGE
16 C2– INVERTER
V– 17
0.1μF
+ 6.3V
+
0.1μF
0.1μF
+ 16V
T1IN
7
T1
2 T1OUT
TTL/CMOS
INPUTS1
T2IN
T3IN
6
20
T2
T3
3 T2OUT
RS-232
1 T3OUT OUTPUTS
T4IN
21
T4
28 T4OUT
R1OUT
8
R1 9 R1IN
R2OUT
TTL/CMOS
OUTPUTS
R3OUT
R4OUT
5
26
22
R2 4 R2IN
R3
27
R3IN
RS-232
INPUTS2
R4 23 R4IN
R5OUT
19
R5 18 R5IN
EN 24
GND
10
ADM211
25
SD
NOTES
1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 9. ADM211 Typical Operating Circuit
Rev. D | Page 6 of 16

6 Page









ADM213 pdf, datenblatt
ADM206/ADM207/ADM208/ADM211/ADM213
Shutdown (SD)
The ADM2xx feature a control input that may be used to
disable the part and reduce the power consump-ion to less than
5 ΩW. This is very useful in battery-operated systems. During
shutdown, the charge pump is turned off, the transmitters are
disabled, and all receivers except R4 and R5 on the ADM213 are
put into a high impedance disabled state. Receivers R4 and R5
on the ADM213 remain enabled during shutdown. This feature
allows monitoring external activity while the device is in a low
power shutdown mode. The shutdown control input is active
high on all parts except the ADM213, where it is active low. See
Table 5 and Table 6.
Enable Input
The ADM211 and ADM213 feature an enable input used to
enable or disable the receiver outputs. The enable input is active
low on the ADM211 and active high on the ADM213. See
Table 5 and Table 6. When the receivers are disabled, their
outputs are placed in a high impedance state. This function
allows the outputs to be connected directly to a microprocessor
data bus. It can also be used to allow receivers from different
devices to share a common data line. The timing diagram for
the enable function is shown in Figure 22.
3V
EN*
0V
TEN TDIS
ROUT
3.5V
0.8V
VOH – 0.1V
VOL + 0.1V
* POLARITY OF EN IS REVERSED FOR ADM213.
Figure 22. Enable Timing
APPLICATION HINTS
Driving Long Cables
In accordance with the EIA-232-E standard, long cables are
permissible provided the total load capacitance does not exceed
2500 pF. For longer cables that do exceed this, it is possible to
trade off baud rate for cable length. Large load capacitances cause
a reduction in slew rate, and therefore the maximum transmis-
sion baud rate is decreased. The ADM2xx are designed to
minimize the slew rate reduction that occurs as load
capacitance increases.
For the receivers, it is important that a high level of noise
immunity be inbuilt so that slow rise and fall times do not cause
multiple output transitions as the signal passes slowly through
the transition region. The ADM2xx have 0.65 V of hysteresis to
guard against this. This ensures that even in noisy environments
error-free reception can be achieved.
High Baud Rate Operation
The ADM2xx feature high slew rates, permitting data
transmission at rates well in excess of the EIA-232-E
specification. The drivers maintain ±5 V signal levels at data
rates up to 120 kB/s under worst-case loading conditions.
Rev. D | Page 12 of 16

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