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PDF AK8126 Data sheet ( Hoja de datos )
| Número de pieza | AK8126 | |
| Descripción | Spread Spectrum Clock Generator | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK8126 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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ASAHI KASEI EMD CORPORATION
www.DataSheet4U.com
Spread Spectrum
Clock Generator
AK8126
Features
Output Frequency Range:
16MHz – 128MHz
Configurable Spread Spectrum Modulation:
- AKEMD’s Original Spread Spectrum
Profile
- Modulation Ratio:
Center Spread:
±0.25%, ±0.5%, ±1.0%, ±1.5%
Down Spread:
-0.5%, -1.0%, -2.0%, -3.0%
- Modulation Frequency:
38.46KHz – 76.92KHz
Input Frequency Range:
- Crystal: 16MHz – 32MHz
- Reference Clock Input : 16MHz – 128MHz
Low Jitter Performance:
100 ps (Max.) Cycle-to-cycle 1s
Low Current Consumption:
2.5mA (Typ.) at 16MHz, 3.3V
Supply Voltage:
3.0 – 3.6V
Operating Temperature Range:
-10 to +85
Package:
10-pin TMSOP (Thin Miniature SOP )
Description
The AK8126 is a spread spectrum clock generator
designed for Home AV applications where EMI
elimination is seriously required. The device uses
the AKEMD’s original spread spectrum profile** to
provide excellent EMI reduction effect without
degradation of system performance. The AK8126
accepts a wide clock frequency range from a
crystal or reference clock input, and provides a
variable spread spectrum modulation selectable by
pin-setting, allowing the device to use in most AV
products easily. The device is available in a very
small 10-pin TMSOP package, and its pin
configuration offers simple PCB layout.
**: Patent pending
Applications
Digital TV Sets
Display Panels
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
Block Diagram
Crystal or
Clock Input XIN
C1
*C2 XOUT
* Capacitors, C1
and C2 are
required for
Crystal input.
S1
S0
C/D/OFF
FR1
FR0
Crystal
Oscillator
PLL
with Spread
Spectrum
modulator
Control
Logic
CKOUT
VSS
VDD
AK8126 Spread Spectrum Clock Generator
MS0548-E-01
-1-
Nov-07
1 page  
The brand name
of AKEMD’s IC’s
www.DataSheet4U.com
AK8126
Spread Spectrum Modulation Characteristics
All specifications at VDD: over 3.0 to 3.6V, Ta: -10 to +85 , Input Frequency: over 16MHz to 128MHz,
unless otherwise noted
Parameter
Symbol
Conditions
MIN TYP MAX Unit
Modulation Frequency(5)
Modulation Ratio
@ Center Spread
Modulation Ratio
@ Down Spread
Average Modulation
Frequency Offset(6)
@ Down Spread
fmod
Mod C
Mod D
fmod-off
Ratio Selection Pin S[1:0]=LH
Ratio Selection Pin S[1:0]=LL
Ratio Selection Pin S[1:0]=HL
Ratio Selection Pin S[1:0]=HH
Ratio Selection Pin S[1:0]=LH
Ratio Selection Pin S[1:0]=LL
Ratio Selection Pin S[1:0]=HL
Ratio Selection Pin S[1:0]=HH
Ratio Selection Pin S[1:0]=LH
Ratio Selection Pin S[1:0]=LL
Ratio Selection Pin S[1:0]=HL
Ratio Selection Pin S[1:0]=HH
38.46
±0.25
±0.5
±1.0
±1.5
-0.5
-1.0
-2.0
-3.0
-0.36
-0.6
-1.2
-1.8
76.92
kHz
%
%
%
(5) Modulation frequency is determined by input frequency range. Following equations provide the
theoretical modulation frequency of AK8126.
Output Frequency Range 16-32MHz: fmod(KHz) = 38.46KHz x fin(MHz) / 16MHz
32-64MHz:
fmod(KHz) = 38.46KHz x fin(MHz) / 32MHz
64-128MHz: fmod(KHz) = 38.46KHz x fin(MHz) / 64MHz
64-128MHz, x4 Output mode: fmod(KHz) = 38.46KHz x fin(MHz) / 16MHz
Where, fin is an input frequency of crystal or reference clock input.
(6) The average output frequency in the mode of down spread modulation is intentionally offset against the
ideal average frequency. The offset is specified by percentage to the target output frequency as shown
in Figure 1.
fmod-ave: Average Output
Frequency
fmod-ideal: Frequency of
½ Modulation Ratio
fo: Target Output
Frequency
fmod-off: Average
Frequency Offset
Modulation Ratio
Figure 1: Offset in the mode of down spread modulation
MS0548-E-01
-5-
Nov-07
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AK8126.PDF ] | |
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