Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

LMK00338 Datasheet(PDF) 17 Page - Texas Instruments

Part No. LMK00338
Description  8-Output Differential Clock Buffer/Level Translator
Download  33 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMK00338 Datasheet(HTML) 17 Page - Texas Instruments

Back Button LMK00338_14 Datasheet HTML 13Page - Texas Instruments LMK00338_14 Datasheet HTML 14Page - Texas Instruments LMK00338_14 Datasheet HTML 15Page - Texas Instruments LMK00338_14 Datasheet HTML 16Page - Texas Instruments LMK00338_14 Datasheet HTML 17Page - Texas Instruments LMK00338_14 Datasheet HTML 18Page - Texas Instruments LMK00338_14 Datasheet HTML 19Page - Texas Instruments LMK00338_14 Datasheet HTML 20Page - Texas Instruments LMK00338_14 Datasheet HTML 21Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 17 / 33 page
background image
OSCin
OSCout
C1
C2
XTAL
RLIM
0.1 PF
50:Trace
CMOS
Driver
0.1 PF
RS
OSCin
OSCout
LMK00338
www.ti.com
SNAS636A – DECEMBER 2013 – REVISED OCTOBER 2014
Typical Applications (continued)
If the crystal oscillator circuit is not used, it is possible to drive the OSCin input with an single-ended external
clock as shown in Figure 18. The input clock should be AC coupled to the OSCin pin, which has an internally-
generated input bias voltage, and the OSCout pin should be left floating. While OSCin provides an alternative
input to multiplex an external clock, it is recommended to use either differential input (CLKinX) since it offers
higher operating frequency, better common mode and power supply noise rejection, and greater performance
over supply voltage and temperature variations.
Figure 18. Driving OSCin with a Single-Ended Input
9.2.1.2 Crystal Interface
The LMK00338 has an integrated crystal oscillator circuit that supports a fundamental mode, AT-cut crystal. The
crystal interface is shown in Figure 19.
Figure 19. Crystal Interface
The load capacitance (CL) is specific to the crystal, but usually on the order of 18 - 20 pF. While CL is specified
for the crystal, the OSCin input capacitance (CIN = 1 pF typical) of the device and PCB stray capacitance (CSTRAY
~ 1~3 pF) can affect the discrete load capacitor values, C1 and C2.
For the parallel resonant circuit, the discrete capacitor values can be calculated as follows:
CL = (C1 * C2) / (C1 + C2) + CIN + CSTRAY
(1)
Typically, C1 = C2 for optimum symmetry, so Equation 1 can be rewritten in terms of C1 only:
CL = C1
2 / (2 * C
1) + CIN + CSTRAY
(2)
Finally, solve for C1:
C1 = (CL - CIN - CSTRAY)*2
(3)
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
17
Product Folder Links: LMK00338


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
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