CF5037 Просмотр технического описания (PDF) - Nippon Precision Circuits
Номер в каталоге
Компоненты Описание
производитель
CF5037 Datasheet PDF : 10 Pages
| |||
BLOCK DIAGRAM
VCC
XIN
XOUT
OE
CF5037 series
Colpitts
OSC
VCC2
OUT
1/2
LVDS
OUTN
GND
OSCILLATOR CIRCUIT CONSTANT
The CF5037 series oscillator setting varies with device version to optimize characteristics over the recom-
mended operating frequency range.
Version
CF5037A1
CF5037B ×
CF5037C×
CF5037D ×
CF5037E ×
CF5037F×
Oscillation mode
Fundamental
or
3rd overtone
Fundamental
Built-in capacitance*1 *2[pF]
CXIN
CXOUT
12
12
8
8
6
6
5
5
(5)
(5)
(4)
(4)
Recommended operating
frequency range*2 *3 [MHz]
80 to 120
100 to 180
150 to 250
250 to 400
(400 to 600)
(600 to 700)
*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
XIN
CXIN
C0 cancel
Rf
RPD1
CXOUT
XOUT
Oscillator block equivalent circuit
The CF5037 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
Share Link: 