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ADM222 Datasheet(PDF) 4 Page - Analog Devices

Part No. ADM222
Description  High Speed, 5 V, 0.1 uF CMOS RS-232 Drivers/Receivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM222 Datasheet(HTML) 4 Page - Analog Devices

   
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ADM222/ADM232A/ADM242
REV. 0
–4–
PIN FUNCTION DESCRIPTION
Mnemonic
Function
V
CC
Power Supply Input, +5 V
± 10%.
V+
Internally generated positive supply (+10 V
nominal).
V–
Internally generated negative supply (–10 V
nominal).
GND
Ground Pin. Must be connected to 0 V.
C1+
External capacitor 1, (+ terminal) is connected
to this pin.
C1–
External capacitor 1, (– terminal) is connected
to this pin.
C2+
External capacitor 2, (+ terminal) is connected
to this pin.
C2–
External capacitor 2, (– terminal) is connected
to this pin.
T
IN
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.
T
OUT
Transmitter (Driver) Outputs. These are RS-232
levels (typically
±9 V).
R
IN
Receiver Inputs. These inputs accept RS-232
signal levels. An internal 5 k
Ω pull-down
resistor to GND is connected on each of these
inputs.
R
OUT
Receiver Outputs. These are TTL/CMOS levels.
NC
No Connect. No connections are required to this
pin.
EN
(ADM242 Only) Active Low Digital Input. May
be used to enable or disable (three-state) both
receiver outputs.
SHDN
(ADM222 & ADM242) Active Low Digital
Input. May be used to disable the device so that
the power consumption is minimized. On the
ADM222 all drivers and receivers are disabled.
On the ADM242 the drivers are disabled but the
receivers remain enabled.
Figure 8. ADM222 DIP & SOIC Pin Configurations
Figure 7. ADM222 Typical Operating Circuit
Figure 5. Shutdown Test Circuit
tDT
+ 5V
TRANSMITTER
OUTPUT
SHDN
INPUT
– 5V
V+
0V
3V
V–
Figure 6. Transmitter Shutdown Disable Timing
NC = NO CONNECT
NC
C1+
VCC
C2+
C2–
V–
R1OUT
T1IN
V+
C1–
GND
T2OUT
T2IN
R2IN
R2OUT
R1IN
T1OUT
1
2
18
17
5
6
7
14
13
12
3
4
16
15
8
11
9
10
TOP VIEW
(Not to Scale)
ADM222
SHDN
VIN
VOUT
50pF
3k
SHDN
* INTERNAL 400k
Ω PULL-UP RESISTOR
ON EACH TTL/MOS INPUT
** INTERNAL 5k
Ω PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
VCC
+5V TO +10V
VOLTAGE DOUBLER
+5V TO –10V
VOLTAGE INVERTER
C1+
C1–
V+
V–
C2+
C2–
T1
ADM222
T2
R1
R2
C1
0.1µF
C2
0.1µF
C3
0.1µF
GND
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
T1OUT
T2OUT
R1IN
R2IN
T1IN
T2IN
TTL/CMOS
INPUTS
*
RS-232
OUTPUTS
RS-232
INPUTS
**
2
4
6
5
12
11
13
10
3
7
15
8
14
9
C4
0.1µF
+5V INPUT
C5
0.1µF
6.3V
17
16
18
SHDN


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