AK8126 [AKM]
Spread Spectrum Clock Generator; 扩频时钟发生器
| 型号： | AK8126 |
| 厂家： | 
ASAHI KASEI MICROSYSTEMS |
| 描述： | Spread Spectrum Clock Generator |
| 文件： | 总8页 (文件大小：174K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ASAHI KASEI EMD CORPORATION
Spread Spectrum
Clock Generator
AK8126
Features
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
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:
configuration offers simple PCB layout.
38.46KHz – 76.92KHz
Input Frequency Range:
- Crystal: 16MHz – 32MHz
- Reference Clock Input : 16MHz – 128MHz
**: Patent pending
Low Jitter Performance:
Applications
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℃
Digital TV Sets
Display Panels
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
Package:
10-pin TMSOP (Thin Miniature SOP )
Block Diagram
Crystal or
Clock Input
XIN
Crystal
Oscillator
C1
CKOUT
PLL
*
XOUT
S1
C2
with Spread
Spectrum
modulator
Capacitors, C1
and C2 are
*
required for
Crystal input.
S0
Control
Logic
C/D/OFF
FR1
FR0
VSS
VDD
AK8126 Spread Spectrum Clock Generator
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AK8126
Pin Descriptions
XIN
1
2
10
9
C/D/OFF
FR1
Package: 10-Pin TMSOP (Top View)
XOUT
VSS
S1
3
8
7
FR0
VDD
4
5
S0
6
CKOUT
Pin
Pin
Pin
Description
Crystal Input or Reference Clock Input
No.
Name
Type
1
XIN
IN
2
XOUT
OUT Crystal Output. Leave this pin floating when the external clock is used.
3
VSS
--
Ground
(1)
(1)
4
5
6
S1
S0
IN
IN
Spread Spectrum Modulation Ratio Select Pin1
Spread Spectrum Modulation Ratio Select Pin0
CKOUT
OUT Clock Output
7
8
VDD
FR0
--
Power Supply
(2)
IN
Clock Frequency Range Select Pin 0
(1)
(3)
9
FR1
IN
IN
Clock Frequency Range Select Pin 1
10
C/D/OFF
Spread Spectrum Modulation Mode Select Pin
(1) Internal pull down 360kW (Typ.)
(2) Internal pull up 360kW (Typ.)
(3) 3-Level Input for Low/Mid/Hi. Biased at 1/2 of VDD with pull-up/down resistors of 360kW (Typ.).
Ordering Information
Temperature
Part Number
Marking
Shipping Packaging
Package
Range
AK8126
8126
Tape and Reel
10-pin TMSOP
-10 to 85 ℃
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AK8126
Absolute Maximum Rating
Over operating free-air temperature range unless otherwise noted (1)
Items
Symbol
VDD
Vin
Ratings
-0.3 to 4.6
Unit
V
Supply Voltage
Input Voltage
VSS-0.3 to VDD+0.3
±10
V
Input Current (any pins except supplies)
IIN
mA
°C
Storage Temperature
Note
Tstg
-55 to 130
(1) Stress beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only. Functional operation of the device at these or any other conditions beyond those
indicated under “Recommended Operating Conditions” is not implied. Exposure to absolute-maximum-rating
conditions for extended periods may affect device reliability. Electrical parameters are guaranteed only over the
recommended operating temperature range.
ESD Sensitive Device
This device is manufactured on a CMOS process, therefore, generically susceptible to
damage by excessive static voltage. Failure to observe proper handling and
installation procedures can cause damage. AKEMD recommends that this device is handled with
appropriate precautions.
Recommended Operation Conditions
Parameter
Symbol
Conditions
Min
Typ
Max Unit
Operating Temperature
Supply Voltage
Ta
-10
3.0
16
85
3.6
32
128
15
10
8
°C
V
VDD
Fin 1
Fin 2
3.3
24
Crystal
MHz
MHz
pF
Input Clock Frequency (1)
External Reference Clock Input
Output Frequency 16 – 67MHz
Output Frequency 67 –100MHz
Output Frequency 100 – 128MHz
16
Output Load Capacitance
Note:
Cp1
pF
pF
(1) Frequency range to operate is required to select by pin-setting of S0 (Pin 5) and S1 (Pin 4). See Table
for the frequency range selection.
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AK8126
DC 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
Pin: S0,S1,FR0, FR1
Pin: S0,S1,FR0, FR1
Pin: C/D/OFF
Pin: C/D/OFF
Pin: C/D/OFF
Pin: XIN
High Level Input Voltage 1
Low Level Input Voltage 1
High Level Input Voltage 2
Low Level Input Voltage 2
Mid Level Input Voltage 2
High Level Input Voltage 3
Low Level Input Voltage 3
VIH 1
VIL 1
08VDD
V
V
V
V
V
V
V
0.2VDD
VIH
2
0.8VDD
VIL 2
VIM 2
VIH 3
VIL 3
0.15VDD
0.45VD 0.50VD 0.55VDD
08VDD
0.2VDD
Pin: XIN
Pin: S0, S1, FR0, FR1,
C/D/OFF
Input Current
IL
-20
+20
μA
V
Pin: CLKOUT
IOH=-4mA
High Level Output
Voltage
VOH
VOL
0.8VDD
Pin: CLKOUT
IOL=+4mA
Low Level Output
Voltage
0.2VDD
V
No load, Ta=25℃
Current Consumption
IDD
2.5
mA
Spread Spectrum Mode
selection by note (2)
(2) In the mode of center spread
AC 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
Output Clock Duty Cycle(4)
Output Clock Rise Time(4)
40
50
60
%
trise
tfall
1.2
ns
Output Clock Fall Time(4)
1.2
ns
ps
Cycle-to-cycle
1s, 1x
Cycle-to-cycle
Peak-to-peak, 1x
Jit 1
100
600
Output Clock Jitter
Jit 2
tlock
ps
Output Lock Time(3)
Power-up
5
ms
(3) The time that output reaches the target frequency within accuracy of ±0.1% from the point that the
power supply reaches VDD
(4) With the load capacitance specified by the recommended operation conditions
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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)
fmod
38.46
76.92 kHz
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
±0.25
±0.5
±1.0
±1.5
-0.5
-1.0
-2.0
-3.0
-0.36
-0.6
Modulation Ratio
@ Center Spread
Mod C
Mod D
%
Modulation Ratio
@ Down Spread
%
%
Average Modulation
Frequency Offset(6)
@ Down Spread
fmod-off
-1.2
Ratio Selection Pin S[1:0]=HH
-1.8
(5) Modulation frequency is determined by input frequency range. Following equations provide the
theoretical modulation frequency of AK8126.
Output Frequency Range 16-32MHz:
32-64MHz:
fmod(KHz) = 38.46KHz x fin(MHz) / 16MHz
fmod(KHz) = 38.46KHz x fin(MHz) / 32MHz
fmod(KHz) = 38.46KHz x fin(MHz) / 64MHz
fmod(KHz) = 38.46KHz x fin(MHz) / 16MHz
64-128MHz:
64-128MHz, x4 Output mode:
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
fmod-ideal: Frequency of
½ Modulation Ratio
Frequency
fo: Target Output
Frequency
fmod-off: Average
Frequency Offset
Modulation Ratio
Figure 1: Offset in the mode of down spread modulation
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AK8126
Operation Clock Frequency Range Selection
The AK8126 operates at a wide frequency rage to support clocking in most of Home AV products. The
operation frequency range applying to the AK8126 is required to select by pin-setting of FR0 (Pin8) and
FR1 (Pin9), as shown in Table 1.
Table 1: Operation Clock Frequency Setting
Pin Setting
FR1 FR0
Input
Output
Input Frequency Applicable Input
Frequency (MHz) Frequency (MHz)
Scaling
Crystal
Clock
L
L
H
L
16 – 32
32 – 64
64 – 128
16 – 32
16 – 32
32 – 64
64 – 128
64 – 128
x 1
L
H
H
H
x4
Spread Spectrum Modulation Selection
The AK8126 operates in two modes of spread spectrum modulation. One is “Center Spread Modulation” in
which the frequency deviation from the target output frequency is equal to the lower side and the upper
side. The other one is “Down Spread Modulation”, which will be used in applications where the target
clock is providing at a maximum frequency rate of that system. In this mode, the maximum spread
frequency is equal to the target frequency, and the frequency deviation is provided in the lower side. The
AK8126 can provide a variable modulation ratio with the AKEMD’s original spread profile for both
modulation modes, offering appropriate tune for EMI elimination without degradation of system
performance.
The modulation mode and the modulation ration are selectable by pin setting of C/D/OFF (Pin 10) and
S[1:0] (Pin 4 and 5), as defined in Table 2 and Table 3, respectively.
.
Table 2: Spread Spectrum Modulation Mode Setting
Pin Setting
Modulation Mode
C/D/OFF
L
M
H
Down Spread
No Modulation
Center Spread
Table 3: Modulation Ratio Setting
Pin Setting
Modulation Ratio (%)
S1
L
L
H
H
S0
L
H
L
Center Spread Mode
Down Spread Mode
-1.0
- 0.5
-2.0
- 3.0
± 0.5
± 0.25
± 1.0
± 1.5
H
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Package Information
· Mechanical data
0 ~ 10°
2.9 ± 0.2
6
10
+0.1
0.127 -0.05
1
5
0.5
0.2 ± 0.1
Unit: mm
· Marking
10
6
a:
b:
c:
d
#1 Pin Index
Part number
d
c
b
AKM
8126
XXX
Date code (3 digits)
Product Family Logo (1)
a
5
1
(1) AKM is the brand name of AKEMD’s IC’s.
AKM and the logo -
- are the brand of AKEMD’s IC’s and identify that AKEMD
continues to offer the best choice for high performance mixed-signal solution under
this brand.
· RoHS Compliance
All integrated circuits form Asahi Kasei EMD Corporation (AKEMD) assembled in
“lead-free” packages* are fully compliant with RoHS.
(*) RoHS compliant products from AKEMD are identified with “Pb free” letter indication on
product label posted on the anti-shield bag and boxes.
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AK8126
IMPORTANT NOTICE
These products and their specifications are subject to change without notice.
When you consider any use or application of these products, please make inquiries the sales office of Asahi
Kasei EMD Corporation (AKEMD) or authorized distributors as to current status of the products.
AKEMD assumes no liability for infringement of any patent, intellectual property, or other rights in the
application or use of any information contained herein.
Any export of these products, or devices or systems containing them, may require an export license or
other official approval under the law and regulations of the country of export pertaining to customs and
tariffs, currency exchange, or strategic materials.
AKEMD products are neither intended nor authorized for use as critical componentsNote1) in any safety, life
support, or other hazard related device or systemNote2), and AKEMD assumes no responsibility for such use,
except for the use approved with the express written consent by Representative Director of AKEMD. As
used here:
Note1) A critical component is one whose failure to function or perform may reasonably be expected to result,
whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and
which must therefore meet very high standards of performance and reliability.
Note2) A hazard related device or system is one designed or intended for life support or maintenance of safety or for
applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may
reasonably be expected to result in loss of life or in significant injury or damage to person or property.
It is the responsibility of the buyer or distributor of AKEMD products, who distributes, disposes of, or
otherwise places the product with a third party, to notify such third party in advance of the above content
and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and
hold AKEMD harmless from any and all claims arising from the use of said product in the absence of such
notification.
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