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PDF ALC100 Data sheet ( Hoja de datos )
| Número de pieza | ALC100 | |
| Descripción | Crystal Requirement | |
| Fabricantes | Avance Logic | |
| Logotipo |  |
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Avance Logic, Inc.
ALC100
Quartz Crystal Requirement for ALC100/ALC100P
This document describes the quartz crystal
requirements for clocking ALC100/P.
1. Frequency and Oscillation Circuits
ALC100/P are designed to work from a
crystal with 24.576MHz. Fig-1 shows the
equivalent circuits of crystal and oscillation
circuits within ALC100/P.
ALC100/P
CRYSTAL
C1 XTALI
22pF
Cs
10pF
22pF
Rs Co
Ls
XTALO
C2 24.576MHz
10pF
Fig-1 oscillation circuits
The series resonant frequency
Fs ≅ 1
2π Ls * Cs
, and parallel resonant frequency
Fp ≅ 1
2π Ls * Cs * Co
Cs + Co
The oscillated frequency between Fs and
Fp
Fo = Fs * 1 + Cs
Co + CL
where CL=(C1+10pF)//(C2+10pF)
2. Crystal Requirements
General Specifications Requirements
Holder Type
HC-49 U/S
Crystal Freq.
24.576 MHz
Oscillation Mode
Fundamental
Load Cap. (CL)
16 ~20 pF
Freq. Tolerance(25oC) +/- 50 ppm
Effective Series
Resistance (Rs)
40 ohm max
Effective Shunt
Capacitance (Co)
Drive Level
Insulation Resistance
7 pF
< 0.1 mW
500 Mohm min. at
DC 100V
Table-1 Crystal General Specification
3. Load Capacitance (CL)
To operate between Fs and Fp requires
external load capacitance. Although
ALC100/P has embed internal 10pF
capacitors at XTALI and XTALO, the
oscillated frequency may be a little higher
than 24.576MHz if no C1 and C2 placed.
To reduce the bit clock jitter and get more
accurate frequency, the external capacitor
C1 and C2 most be used.
ALC100/P
C1 XTALI
22pF
10pF
24.576MHz Y1
22pF
C2
Clitter
XTALO
10pF
Fig-2 Clitter due to PCB Trace
Avance Logic, Inc.
1
Rev 1.0
May 22, 2000
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet ALC100.PDF ] | |
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