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ADM222 데이터시트 PDF




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부품번호 ADM222 기능
기능 CMOS RS-232 Drivers/Receivers
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ADM222 데이터시트, 핀배열, 회로
a
High-Speed, 5 V, 0.1 F
CMOS RS-232 Drivers/Receivers
ADM222/ADM232A/ADM242
FEATURES
200 kB/s Transmission Rate
Small (0.1 F) Charge Pump Capacitors
Single 5 V Power Supply
Meets All EIA-232-E and V.28 Specifications
Two Drivers and Two Receivers
On-Board DC-DC Converters
؎9 V Output Swing with 5 V Supply
؎30 V Receiver Input Levels
Pin Compatible with MAX222/MAX232A/MAX242
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
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
FUNCTIONAL BLOCK DIAGRAM
5V INPUT
0.1F
0.1F
0.1F
C1+
VCC
+5V TO +10V
VOLTAGE DOUBLER
C1–
V+
C2+ +5V TO –10V
VOLTAGE INVERTER V–
C2–
0.1F
0.1F
TTL/CMOS
INPUTS*
T1IN
T2IN
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
T1 T1OUT
RS-232
OUTPUTS
T2 T2OUT
R1 R1IN
RS-232
INPUTS**
R2 R2IN
ADM2xx
GND
EN
SHDN
(ADM242)
(ADM222, ADM242)
* INTERNAL 400kPULL-UP RESISTOR
ON EACH TTL/CMOS INPUT
** INTERNAL 5kPULL-DOWN RESISTOR
ON EACH RS-232 INPUT
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.
REV. C
Document Feedback
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADM222 pdf, 반도체, 판매, 대치품
ADM222/ADM232A/ADM242
VIN
SHDN
3k
VOUT
50pF
Figure 5. Shutdown Test Circuit
3V
SHDN
INPUT
0V
tDT
V+
TRANSMITTER
OUTPUT
V
+ 5V
5V
Figure 6. Transmitter Shutdown Disable Timing
C1
0.1F
C2
0.1F
5V INPUT
C5
0.1F
6.3V
17
2 C1+
VCC
4
+5V TO +10V
VOLTAGE DOUBLER
V+
3
C1
5
C2+ +5V TO 10V
VOLTAGE INVERTER V
7
6
C2
C3
0.1F
C4
0.1F
TTL/CMOS
INPUTS*
T1IN
T2IN
12
11
TTL/CMOS
OUTPUTS
13
R1OUT
10
R2OUT
T1
T2
R1
R2
15
T1OUT
RS-232
8
OUTPUTS
T2OUT
14
R1IN
RS-232
9 INPUTS**
R2IN
ADM222
GND
18 SHDN
16 * INTERNAL 400kPULL-UP RESISTOR
ON EACH TTL/CMOS INPUT
** INTERNAL 5kPULL-DOWN RESISTOR
ON EACH RS-232 INPUT
Figure 7. ADM222 Typical Operating Circuit
PIN FUNCTION DESCRIPTION
Mnemonic
VCC
V+
V–
GND
C1+
C1–
C2+
C2–
TIN
TOUT
RIN
ROUT
NC
EN
SHDN
Function
Power Supply Input, 5 V ± 10%.
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 kpull-up
resistor to VCC is connected on each input.
Transmitter (Driver) Outputs. These are RS-232
levels (typically ± 9 V).
Receiver Inputs. These inputs accept RS-232
signal levels. An internal 5 kpull-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
be used to enable or disable (three-state) both
receiver outputs.
(ADM222 and 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.
NC 1
18 SHDN
C1+ 2
V+ 3
17 VCC
16 GND
C14 ADM222 15 T1OUT
C2+ 5 TOP VIEW 14 R1IN
(Not to Scale)
C26
13 R1OUT
V7
12 T1IN
T2OUT 8
11 T2IN
R2IN 9
10 R2OUT
NC = NO CONNECT
Figure 8. ADM222 DIP and SOIC Pin Configurations
–4– REV.C

4페이지










ADM222 전자부품, 판매, 대치품
ADM222/ADM232A/ADM242
GENERAL INFORMATION
The ADM222/ADM232A/ADM242 are high-speed RS-232
drivers/receivers requiring a single digital 5 V supply. The RS-232
standard requires transmitters that will deliver ± 5 V minimum
on the transmission channel and receivers that can accept signal
levels down to ± 3 V. The parts achieve this by integrating step-
up voltage converters and level-shifting transmitters and receivers
onto the same chip. CMOS technology is used to keep the
power dissipation to an absolute minimum. All devices con-
tain an internal charge pump voltage doubler and a voltage
inverter that generates ± 10 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. It is essentially plug-in-compatible and does
not have materially different applications.
CIRCUIT DESCRIPTION
The internal circuitry consists of four main sections. These are:
Charge Pump Voltage Converter
TTL/CMOS to RS-232 Transmitters
RS-232 to TTL/CMOS Receivers
Enable and Shutdown Functions.
Charge Pump DC-DC Voltage Converter
The Charge Pump Voltage converter consists of an oscillator
and a switching matrix. The converter generates a ± 10 V supply
from the input 5 V level. This is done in two stages using a
switched capacitor technique. The 5 V input supply is doubled
to 10 V using capacitor C1 as the charge storage element. The
–10 V level is also generated from the input 5 V supply using C1
and C2 as the storage elements.
Capacitors C3 and C4 are used to reduce the output ripple.
Their values are not critical and can be reduced if higher levels
of ripple are acceptable. The charge pump capacitors C1 and
C2 may also be reduced at the expense of higher output imped-
ance on the V+ and V– supplies.
The V+ and V– supplies may also be used to power external
circuitry if the current requirements are small. Please refer to
the typical performance characteristics which shows the V+, V–
output voltage vs. current.
In the shutdown mode the charge pump is disabled and V+
decays to VCC while V– decays to 0 V.
Transmitter (Driver) Section
The Drivers convert TTL/CMOS input levels into RS-232
output levels. With VCC = 5 V and driving a typical RS-232
load, the output voltage swing is ± 9 V. Even under worst-case
conditions the drivers are guaranteed to meet the ± 5 V RS-232
minimum requirement.
The input threshold levels are both TTL- and CMOS-compat-
ible with the switching threshold set at VCC/4. With a nominal
VCC = 5 V, the switching threshold is 1.25 V typical. Unused
inputs may be left unconnected, as an internal 400 kpull-up
resistor pulls them high forcing the outputs into a low state.
As required by the RS-232 standard, the slew rate is limited to
less than 30 V/µs without the need for an external slew limiting
capacitor, and the output impedance in the power-off state is
greater than 300 .
Receiver Section
The receivers are inverting level-shifters that accept RS-232
input levels (± 3 V to ± 15 V) and translate them into 5 V TTL/
CMOS levels. The inputs have internal 5 kpull-down resistors
to ground and are also protected against overvoltages of up to
± 30 V. The guaranteed switching thresholds are 0.8 V mini-
mum and 2.4 V maximum, which are well within the ± 3 V
RS-232 requirement. The low level threshold is deliberately
positive as it ensures that an unconnected input will be inter-
preted as a low level.
The receivers have Schmitt trigger input with a hysteresis level
of 0.5 V. This ensures error-free reception for both noisy inputs
and for inputs with slow transition times
Enable and Shutdown Functions
On the ADM222, both receivers are fully disabled during
shutdown.
On the ADM242, both receivers continue to operate normally.
This function is useful for monitoring activity so that when it
occurs, the device can be taken out of the shutdown mode.
The ADM242 also contains a receiver enable function (EN)
which can be used to fully disable the receivers, independent
of SHDN.
APPLICATIONS INFORMATION
A selection of typical operating circuits is shown in TPCs 1–6
and Figure 13.
A1
100
90
2.0V
10
0%
5V
5V
5s
Figure 13. Transmitter Output Disable Timing
REV. C
–7–

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