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ADM208 Datasheet(PDF) 12 Page - Analog Devices

Part No. ADM208
Description  0.1 μF, 5 V Powered CMOS RS-232 Drivers/Receivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADM208 Datasheet(HTML) 12 Page - Analog Devices

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ADM206/ADM207/ADM208/ADM211/ADM213
Rev. D | Page 12 of 16
Shutdown (SD)
The ADM2xx feature a control input that may be used to
disable the part and reduce the power consump-ion to less than
5 ΩW. This is very useful in battery-operated systems. During
shutdown, the charge pump is turned off, the transmitters are
disabled, and all receivers except R4 and R5 on the ADM213 are
put into a high impedance disabled state. Receivers R4 and R5
on the ADM213 remain enabled during shutdown. This feature
allows monitoring external activity while the device is in a low
power shutdown mode. The shutdown control input is active
high on all parts except the ADM213, where it is active low. See
Table 5 and Table 6.
Enable Input
The ADM211 and ADM213 feature an enable input used to
enable or disable the receiver outputs. The enable input is active
low on the ADM211 and active high on the ADM213. See
Table 5 and Table 6. When the receivers are disabled, their
outputs are placed in a high impedance state. This function
allows the outputs to be connected directly to a microprocessor
data bus. It can also be used to allow receivers from different
devices to share a common data line. The timing diagram for
the enable function is shown in Figure 22.
3V
0V
ROUT
TEN
TDIS
VOH – 0.1V
VOL + 0.1V
3.5V
0.8V
* POLARITY OF EN IS REVERSED FOR ADM213.
EN*
Figure 22. Enable Timing
APPLICATION HINTS
Driving Long Cables
In accordance with the EIA-232-E standard, long cables are
permissible provided the total load capacitance does not exceed
2500 pF. For longer cables that do exceed this, it is possible to
trade off baud rate for cable length. Large load capacitances cause
a reduction in slew rate, and therefore the maximum transmis-
sion baud rate is decreased. The ADM2xx are designed to
minimize the slew rate reduction that occurs as load
capacitance increases.
For the receivers, it is important that a high level of noise
immunity be inbuilt so that slow rise and fall times do not cause
multiple output transitions as the signal passes slowly through
the transition region. The ADM2xx have 0.65 V of hysteresis to
guard against this. This ensures that even in noisy environments
error-free reception can be achieved.
High Baud Rate Operation
The ADM2xx feature high slew rates, permitting data
transmission at rates well in excess of the EIA-232-E
specification. The drivers maintain ±5 V signal levels at data
rates up to 120 kB/s under worst-case loading conditions.


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