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ADM208EAR Datasheet(PDF) 6 Page - Analog Devices

Part No. ADM208EAR
Description  EMI/EMC Compliant, -15 kV ESD Protected, RS-232 Line Drivers/Receivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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 6 page
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ADM206E/ADM207E/ADM208E/ADM211E/ADM213E
REV. B
–6–
14
13
12
11
10
9
8
1
2
3
4
7
6
5
17
16
15
20
19
18
28
27
26
25
24
23
22
21
TOP VIEW
(Not to Scale)
ADM213E
T3OUT
R3OUT
R3IN
T4OUT
T1OUT
T2OUT
R2IN
R4OUT*
R4IN*
R2OUT
T2IN
T1IN
R1OUT
R1IN
GND
R5OUT*
T3IN
T4IN
VCC
C1+
V+
C1–
R5IN*
C2+
C2–
V–
EN
*ACTIVE IN SHUTDOWN
SHDN
Figure 9. ADM213E Pin Configuration
PIN FUNCTION DESCRIPTIONS
Mnemonic
Function
VCC
Power Supply Input: +5 V
± 10%.
V+
Internally Generated Positive Supply (+9 V nominal).
V–
Internally Generated Negative Supply (–9 V nominal).
GND
Ground Pin. Must Be Connected to 0 V.
C1+, C1–
External Capacitor 1 is connected between these pins. 0.1
µF capacitor is recommended but larger capacitors up
to 47
µF may be used.
C2+, C2–
External Capacitor 2 is connected between these pins. 0.1
µF capacitor is recommended but larger capacitors up
to 47
µF may be used.
TIN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k
Ω pull-up resistor to V
CC
is connected on each input.
TOUT
Transmitter (Driver) Outputs. These are RS-232 signal levels (Typically
±9 V).
RIN
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 k
Ω pull-down resistor to GND is
connected on each input.
ROUT
Receiver Outputs. These are CMOS output logic levels.
EN/
EN
Receiver Enable (Active High on ADM213E, Active Low on ADM211E); This input is used to enable/disable the
receiver outputs. With
EN = Low ADM211E (EN = High ADM213E), the receiver outputs are enabled. With EN
= High (EN = Low ADM213E), the receiver outputs are placed in a high impedance state.
SHDN/SHDN
Shutdown Control (Active Low on ADM213E, Active High on ADM211E); Refer to Table II. In shutdown the
charge pump is disabled, the transmitter outputs are turned off and all receiver outputs (ADM211E), receivers R1,
R2, R3 (ADM213E) are placed in a high impedance state. Receivers R4 and R5 on the ADM213E continue to
operate normally during shutdown. Power consumption in shutdown for all parts reduces to 5
µW.
TTL/CMOS
INPUTS
*
TTL/CMOS
OUTPUTS
R5OUT***
T1IN
ADM213E
SHDN
RS-232
OUTPUTS
T1OUT
GND
T2IN
T3IN
T4IN
T2OUT
T3OUT
T4OUT
RS-232
INPUTS
**
R1IN
R2IN
R3IN
R1OUT
R2OUT
R3OUT
*INTERNAL 400k
PULL-UP RESISTOR ON EACH CMOS INPUT
**INTERNAL 5k
PULL-DOWN RESISTOR ON EACH RS-232 INPUT
***ACTIVE IN SHUTDOWN
EN
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
14
12
11
0.1 F
6.3V
+5V INPUT
VCC
V+
V–
C1+
C1–
C2+
C2–
0.1 F
16V
0.1 F
16V
0.1 F
16V
13
0.1 F
10
15
17
3
1
2
28
T3
T4
T2
T1
21
6
7
20
25
27
9
4
R1
R2
R3
5
8
16
R4IN***
R5IN***
R4OUT***
18
23
R4
R5
19
26
24
22
Figure 10. ADM213E Typical Operating Circuit




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