CF5036 series
BLOCK DIAGRAM
VCC
VCC2
XIN
OUT
Colpitts
OSC
1/2
PECL
OUTN
XOUT
GND
OE
OSCILLATOR CIRCUIT CONSTANT
The CF5036 series oscillator setting varies with device version to optimize characteristics over the recom-
mended operating frequency range.
*1 *2
Built-in capacitance
[pF]
Recommended operating
*3
Version
Oscillation mode
frequency range [MHz]
C
C
XOUT
XIN
CF5036G×
CF5036A×
CF5036B×
CF5036C×
CF5036D×
CF5036E×
CF5036F×
CF5036V×
CF5036W×
16
12
8
16
12
8
50 to 80
80 to 120
100 to 180
150 to 250
250 to 400
400 to 600
600 to 700
80 to 400
400 to 700
Fundamental
or
3rd overtone
6
6
5
5
Fundamental
5
5
4
4
(4)
(4)
(4)
(4)
Setting by external components
(C0 cancel is not built-in.)
*1. The oscillator internal capacitance values includes parasitic capacitance.
*2. Values in parentheses ( ) are provisional only.
*3. The recommended operating frequency is a yardstick value derived from the crystal used for NPC characteristics authentication. How-
ever, the oscillator frequency band is not guaranteed. Specifically, the characteristics can vary greatly due to crystal characteristics
and mounting conditions, so the oscillation characteristics of components must be carefully evaluated.
Oscillator Equivalent Circuit
C0 cancel
CXIN
Rf
XIN
RPD1
CXOUT
XOUT
Oscillator block equivalent circuit
The CF5036 series oscillator circuit has a C0 cancel circuit built-in to improve the oscillator margin. If power is applied when there is an
open circuit between XIN and XOUT, self oscillation may occur, which is not abnormal. Users should confirm that the oscillator operates
normally when a crystal unit is connected.
SEIKO NPC CORPORATION —3
NPC [ NIPPON PRECISION CIRCUITS INC ]
