I
N P U T
L
I M I T I N G
19
I
NPUT
R
ESISTOR
R
EQUIREMENT
MICRONETICS / 26 HAMPSHIRE DRIVE / HUDSON, NH 03051 / TEL: 603-883-2900 / FAX: 603-882-8987 / CUSTOMER HOTLINE: 1-800-963-3382 / WEB: WWW.MWIRELESS.COM
I
NPUT
V
OLTAGE
L
IMITING
(
ON
M3500-0916
ONLY
)
The M3500-0916 uses an input zener diode
to clamp the input voltage at 13V. This
guarantees that the VCO always has an
output at high tune voltages.
Micronetics recommends that an input
resistor be used in designs where the input
tune line voltage may be larger than 13V in
order to limit the current flow through the
zener diode. See below for suggested R
TUNE
values versus the maximum tune voltage.
The M3500-0916 is the only version
that requires input voltage limiting.
R
TUNE
V
ERSUS
M
AXIMUM
T
UNE
V
OLTAGE
V
TUNE
R
TUNE
(I
TUNE
= 10 mA)
13V
0
15V
200
20V
700
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