PE9721 Просмотр технического описания (PDF) - Peregrine Semiconductor Corp.
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PE9721 Datasheet PDF : 13 Pages
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PE9721
Preliminary Specification
Application Information
The PE9721 has been designed to allow a self-
starting PLL synthesizer to be built, removing the
need to have a micro-controller or other
programming source load data into the device on
power-up. It can be used as a remotely controllable
PLL as well, since the EEPROM circuitry has been
added to a complete PLL core (PE3339).
The PE9721’s EEPROM can be programmed in-
circuit, or prior to assembly using a fixture fitted with
a socket. It can be reprogrammed a minimum of
100 times, but is not designed to support constant
reprogramming of the EEPROM by an application.
Self-Starting Mode
In self-starting applications, the EE Register is used
to control the device and must be selected per
Table 9. Additionally, the contents of the EEPROM
must be copied to the EE Register per Table 10,
and device power must be stable for this transfer to
be reliably accomplished. These requirements can
be met by connecting a capacitor of 50pF or greater
from the EESel pin to ground. The delay of the
rising edge on EESel, created by the RC time
constant of its 70k ohm internal pull-up resistor and
the external capacitor, will allow device power to
stabilize first, ensuring proper data transfer.
PEREGRINE SEMICONDUCTOR CORP. | http://www.peregrine-semi.com
Copyright Peregrine Semiconductor Corp. 2003
Page 11 of 13
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