adm232a Analog Devices, Inc., adm232a Datasheet

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adm232a

Manufacturer Part Number
adm232a
Description
High Speed, +5 V, 0.1 Uf Cmos Rs-232 Drivers/receivers
Manufacturer
Analog Devices, Inc.
Datasheet

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a
GENERAL DESCRIPTION
The ADM222, ADM232A, ADM242 are a family of high-speed
RS-232 line drivers/receivers offering transmission rates up to
200 kB/s. Operating from a single 5 V power supply, a highly
efficient on-chip charge pump using small (0.1 µF) external
capacitors allows RS-232 bipolar levels to be developed. Two
RS-232 drivers and two RS-232 receivers are provided on
each device.
The devices are fabricated on BiCMOS, an advanced mixed
technology process that combines low power CMOS with high-
speed bipolar circuitry. This allows for transmission rates up to
200 kB/s, yet minimizes the quiescent power supply current to
under 5 mA.
The ADM232A is a pin-compatible, high-speed upgrade for the
AD232 and for the ADM232L. It is available in 16-lead DIP
and in both narrow and wide surface-mount (SOIC) packages.
The ADM222 contains an additional shutdown (SHDN) func-
tion that may be used to disable the device, thereby reducing the
supply current to 0.1 µA. During shutdown, all transmit/receive
Protected by U.S. Patent No. 5,237,209.
CMOS RS-232 Drivers/Receivers
functions are disabled. The ADM222 is available in 18-lead
DIP and in a wide surface-mount (SOIC) package.
The ADM242 combines both shutdown (SHDN) and enable
(EN) functions. The shutdown function reduces the supply
current to 0.1 mA. During shutdown, the transmitters are dis-
abled but the receivers continue to operate normally. The
enable function allows the receiver outputs to be disabled
thereby facilitating sharing a common bus. The ADM242 is
available in 18-lead DIP and in a wide surface-mount (SOIC)
package.
TTL/CMOS
OUTPUTS
ADM222/ADM232A/ADM242
TTL/CMOS
INPUTS
0.1 F
0.1 F
R1
R2
T1
T2
OUT
OUT
FUNCTIONAL BLOCK DIAGRAM
IN
IN
High-Speed, 5 V, 0.1 F
C1+
C1–
C2+
C2–
ADM2xx
0.1 F
VOLTAGE DOUBLER
VOLTAGE INVERTER
+5V TO +10V
+5V TO –10V
GND
T1
T2
V
CC
R1
R2
5V INPUT
ON EACH TTL/CMOS INPUT
ON EACH RS-232 INPUT
INTERNAL 5k
INTERNAL 400k
SHDN
EN
V–
V+
PULL-DOWN RESISTOR
(ADM222, ADM242)
(ADM242)
T1
T2
R1
R2
PULL-UP RESISTOR
0.1 F
OUT
OUT
0.1 F
IN
IN
RS-232
INPUTS
RS-232
OUTPUTS

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adm232a Summary of contents

Page 1

... GENERAL DESCRIPTION The ADM222, ADM232A, ADM242 are a family of high-speed RS-232 line drivers/receivers offering transmission rates up to 200 kB/s. Operating from a single 5 V power supply, a highly efficient on-chip charge pump using small (0.1 µF) external capacitors allows RS-232 bipolar levels to be developed. Two RS-232 drivers and two RS-232 receivers are provided on each device ...

Page 2

... ADM222/ADM232A/ADM242–SPECIFICATIONS Parameter RS-232 TRANSMITTERS Output Voltage Swing Input Logic Threshold Low, V INL Input Logic Threshold High, V INH Logic Pull-Up Current Data Rate Output Resistance Output Short Circuit Current (Instantaneous) RS-232 RECEIVERS RS-232 Input Voltage Range RS-232 Input Threshold Low RS-232 Input Threshold High ...

Page 3

... CC tion is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Model ADM222AN ADM222AR ADM232AAN ADM232AARN ADM232AARW –40°C to +85°C ADM242AN ADM242AR 3V t PHLT V+ 0V V– ...

Page 4

... ADM222/ADM232A/ADM242 SHDN 3V SHDN INPUT TRANSMITTER OUTPUT V– 5V INPUT C5 0 +5V TO +10V 0 VOLTAGE DOUBLER C1– 5 C2+ +5V TO –10V C2 VOLTAGE INVERTER 0 C2– TTL/CMOS INPUTS OUT TTL/CMOS 10 OUTPUTS R2 R2 OUT ADM222 ...

Page 5

... OUT TTL/CMOS RS-232 INPUTS OUTPUTS 7 T2 OUT RS-232 TTL/CMOS INPUTS 8 OUTPUTS PULL-UP RESISTOR PULL-DOWN RESISTOR ADM222/ADM232A/ADM242 SHDN C1 GND 3 16 C1– OUT ADM242 C2 TOP VIEW 14 IN (Not to Scale) C2– ...

Page 6

... ADM222/ADM232A/ADM242 –Typical Performance Characteristics –5 V– –10 – LOAD CURRENT – –1 –3 –5 –7 –9 0 500 1000 1500 2000 LOAD CAPACITANCE – CH1 10.0V CH2 5.00V M 1. –5 –10 – ...

Page 7

... V from the 5 V input. Four exter- nal 0.1 µF capacitors are required for the internal charge pump voltage converter. The ADM222/ADM232A/ADM242 is a modification, enhance- ment and improvement to the AD230-AD241 family and derivatives thereof essentially plug-in-compatible and does not have materially different applications ...

Page 8

... ADM222/ADM232A/ADM242 16-Lead Plastic DIP (N-16) 0.840 (21.34) 0.745 (18.92 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) SEATING 0.100 0.022 (0.558) 0.070 (1.77) PLANE (2.54) 0.014 (0.356) 0.045 (1.15) BSC 16-Lead Wide SOIC (R-16W) 0.4133 (10.50) 0.3977 (10.00 0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65 0.3937 (10.00) PIN 1 0 ...

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