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ADM208AR Datasheet(PDF) 12 Page - Analog Devices |
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ADM208AR Datasheet(HTML) 12 Page - Analog Devices |
12 / 16 page ADM206–ADM211/ADM213 Rev. C | Page 12 of 16 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 ADM209, ADM211, and ADM213 feature an enable input used to enable or disable the receiver outputs. The enable input is active low on the ADM209 and 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 24. 3V 0V ROUT TEN TDIS VOH – 0.1V VOL + 0.1V 3.5V 0.8V * POLARITY OF EN IS REVERSED FOR ADM213. EN* Figure 24. 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 ADM206–ADM211/ADM213 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 ADM206–ADM211/ ADM213 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 ADM206–ADM211/ADM213 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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