M685 Datasheet Rev 0.7 - Errata Revised 29Jul2009
Integrated Device Technology, Inc. ● Communication Modules ● www.idt.com ● tel (508) 852-5400
M685
D
UAL
SAW, S
ELECTABLE
F
REQUENCY
VCSO
Errata
P
RODUCT
A
PPLICATION
C
AUTION
F_SEL Change During Power-Up Can Affect Output Frequency Accuracy
M685E1
The M685 features an
F_SEL
input which is used to select the internal VCSO frequency.
The
F_SEL
input logic level should not be changed while the M685 device is in operation (that is, voltage
is applied to the pin
VCC
), particularly when the pin
VIN
(the control voltage input) is above 2.0V.
Changing the
F_SEL
input logic level during operation may result in an erroneous output frequency.
It is safe to change
F_SEL
during operation if pin
VIN
can be held low, or at least below 2.0V.
