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參數(shù)資料
| 型號： | MAX212 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 132K |
| 代理商： | MAX212 |
When using the minimum recommended capacitor
values, make sure the capacitance value does not
degrade excessively as the operating temperature
varies. If in doubt, use c apac itors with a
larger nominal value (for example, 2 times larger).
The effective series resistance (ESR) of the capaci-
tors may vary over temperature and increase
when below 0°C. ESR influences the amount of rip-
ple on V+ and V-, so if low ripple is required over
wide temperature ranges, use larger capacitors or
low-ESR types.
To reduce the output impedance at V+ and V-, use
larger capacitors (up to 10μF). This can be useful
when “stealing” power from V+ or from V-.
Driver Outputs when Exiting S hutdown
Figure 3 shows the MAX214 driver outputs when exiting
shutdown. As they become active, the two driver out-
puts are shown going to opposite RS-232 levels (one
driver input is high, the other is low). Each driver is
loaded with 3k
in parallel with 2.5nF.
Power-S upply Bypassing
Decouple V
CC
to ground with a capacitor of the same
value as the charge-pump capacitors.
V + and V - as Power S upplies
A small amount of power can be drawn from V+ and V-,
although this will reduce noise margins. See the
Output Voltage vs. Load Current graph in the Typical
Operating Characteristics. Increasing the charge-
pump capacitor sizes up to 10μF reduces the imped-
ance of the V+ and V- outputs.
High Data Rates
The MAX214 maintains the RS-232 ±5.0V minimum
driver output voltage even at high data rates. The
Typical Operating Characteristics show transmitter out-
put voltage levels driving 3k
in parallel with various
capacitive loads at data rates up to 120kbps.
M
Programmable DT E/DCE,
+5V RS -232 Transc eiver
_______________________________________________________________________________________
9
+5V
A
+5V
B
-10V
C
+10V
0V
-5V
0V
A = TRANSMITTER OUTPUT HIGH, +5V/div
B = TRANSMITTER OUTPUT LOW, +5V/div
C = SHDN INPUT, +5V/div
HORIZONTAL = 200
μ
s
Figure 3. Transmitter Outputs When Exiting Shutdown
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