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AN158 Datasheet(PDF) 1 Page - Macronix International

Part No. AN158
Description  Serial-Data Interface Chip Supplies Bipolar Voltages
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Maker  MCNIX [Macronix International]
Homepage  http://www.macronix.com
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AN158 Datasheet(HTML) 1 Page - Macronix International

   
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INTERFACE CIRCUITS
Jul 09, 1998
Serial-Data Interface Chip Supplies Bipolar
Voltages
Some of the interface ICs currently available for serial-data transmission not only operate
from low VCC levels (5V or 3.3V); they also generate bipolar dc voltages (±6.5V to ±10V) to
support the minimum driver-output levels as specified by EIa/TIa-232. With care, you can
steal useful amounts of power from these voltage rails without interfering with the IC's
operation.
In Figure 1, the IC's switch-mode controller operates with an external inductor, two diodes,
and two capacitors to produce ±6.5V. FETs Q1 and Q2 ensure start-up for the circuit by
disconnecting the load until these switch-mode supply voltages are present. Note that Q1
must be a logic-level device.


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