Moteur de recherche de fiches techniques de composants électroniques |
|
CDCE6214-Q1 Fiches technique(PDF) 13 Page - Texas Instruments |
|
|
CDCE6214-Q1 Fiches technique(HTML) 13 Page - Texas Instruments |
13 / 28 page 13 CDCE6214-Q1 www.ti.com SNAS786 – AUGUST 2019 Product Folder Links: CDCE6214-Q1 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Feature Description (continued) The reference MUX selects the reference clock for the PLL. Pin 4 (REFSEL) can be used to select PRIREF or SECREF Input path. Alternatively, this can be configured through the register settings. A reference divider or a clock doubler can be engaged to further multiply (2x) or divide the reference clock to the PLL. The output clock from the reference block can be bypassed to the OUT0 and other output channels. The bypassed clock is selectable between the Input clock or PFD clock. 8.3.1.2 XTAL Oscillator The SECREF_P and SECREF_N pins provide a crystal oscillator stage to drive a fundamental mode crystal in the range of 10 MHz to 50 MHz. The crystal input stage integrates a tunable load capacitor array up to 9 pF. The drive capability of the oscillator is adjusted using register programming. 8.3.1.3 LVCMOS The LVCMOS input buffer threshold voltage follows VDD_REF. This allows the engineer to use the device as a level shifter because the outputs all have separate supplies. 8.3.1.4 Differential AC-Coupled The differential input stage has an internal bias generator and internal AC-coupling capacitor. It should only be used as an AC-coupled reference input. 8.3.1.5 Reference MUX Either PRIREF or SECREF can be selected as clock to the PLL and clock distribution path. The reference MUX is controlled either through pin 4 (REFSEL) or through the register settings. 8.3.1.6 Reference Divider A reference divider can be used to divide higher input frequencies to the permitted PFD range. It supports division values of 1 to 255. 8.3.1.7 Reference Doubler The reference path contains a doubler circuit. It is used to double the input frequency and can be used to achieve the highest PFD update frequency of 100 MHz using a 50-MHz crystal or PFD update frequency of 50 MHz using a 25-MHz crystal. 8.3.1.8 Clock Bypass The input reference clock or the PFD clock can be bypassed to OUT0 (LVCMOS output). It can also be bypassed to the OUT1–OUT4 pins, which are selectable among other clock distribution networks. 8.3.2 Phase-Locked Loop (PLL) The CDCE6214-Q1 has a fully integrated Phase-Locked Loop (PLL) circuit. The error between a reference phase and an internal feedback phase is compared at the phase-frequency-detector. The comparison result is fed to a charge pump that is connected to an integrated loop filter. The control voltage resulting from the loop filter tunes an internal voltage-controlled oscillator (VCO). The frequency of the VCO is fed through a feedback divider (N-counter) back to the PFD. • Integer and Fractional-N PLL mode of operation. • 24-bit Numerator and Denominator can be used to generate fractional frequencies with frequency accuracy better than 0.1ppm. • PFD operates between 1 MHz and 100 MHz. • Live Lock Detector provides PLL Lock status (not in SSC mode). Additionally, sticky bit lock detect detects if there was any temporary loss of lock. • Integrated selectable loop filter components. • For a 25-MHz PFD frequency, PFD bandwidth between 100 kHz and 1.6 MHz can be achieved to optimize |
Numéro de pièce similaire - CDCE6214-Q1 |
|
Description similaire - CDCE6214-Q1 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |