ADM222 Analog Devices, ADM222 Datasheet - Page 4

• Manufacturer Part Number: ADM222
• Description: High Speed/ +5 V/ 0.1 uF CMOS RS-232 Drivers/Receivers
• Manufacturer: Analog Devices

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