AK8126

AK8126
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
configuration offers simple PCB layout.
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
**: Patent pending
Low Jitter Performance:
Applications
100 ps (Max.) Cycle-to-cycle 1σ
Digital TV Sets
Display Panels
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
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 )
Block Diagram
Crystal or
Clock Input XIN
Crystal
Oscillator
C1
*C2
XOUT
C1
* Capacitors,
and C2 are
required for
Crystal input.
CKOUT
with Spread
Spectrum
modulator
S1
S0
PLL
Control
Logic
C/D/OFF
FR1
FR0
VSS
VDD
AK8126 Spread Spectrum Clock Generator
MS0548-E-03
Nov-09
-1-
AK8126
Pin Descriptions
XIN
XOUT
VSS
S1
1
2
10
9
3
8
7
FR0
VDD
6
CKOUT
4
5
S0
C/D/OFF
FR1
Package: 10-Pin TMSOP (Top View)
Pin
No.
Pin
Name
Pin
Type
1
XIN
IN
2
XOUT
OUT
3
VSS
--
Ground
4
S1
IN
Spread Spectrum Modulation Ratio Select Pin1
(1)
5
S0
IN
Spread Spectrum Modulation Ratio Select Pin0
(1)
6
CKOUT
OUT
Clock Output
7
VDD
--
Power Supply
8
FR0
IN
Clock Frequency Range Select Pin 0
(1)
9
FR1
IN
Clock Frequency Range Select Pin 1
(2)
10
C/D/OFF
IN
Spread Spectrum Modulation Mode Select Pin
(3)
Description
Crystal Input or Reference Clock Input
Crystal Output. Leave this pin floating when the external clock is used.
(1) Internal pull down 360kΩ (Typ.)
(2) Internal pull up 360kΩ (Typ.)
(3) 3-Level Input for Low/Mid/Hi. Biased at 1/2 of VDD with pull-up/down resistors of 360kΩ (Typ.).
Ordering Information
Part Number
Marking
Shipping Packaging
Package
Temperature
Range
AK8126
8126
Tape and Reel
10-pin TMSOP
-10 to 85 ℃
Nov-09
MS0548-E-03
-2-
AK8126
Absolute Maximum Rating
Over operating free-air temperature range unless otherwise noted (1)
Items
Supply Voltage
Input Voltage
Symbol
Ratings
Unit
VDD
-0.3 to 4.6
V
Vin
VSS-0.3 to VDD+0.3
V
IIN
±10
mA
Tstg
-55 to 130
°C
Input Current (any pins except supplies)
Storage Temperature
Note
(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. AKM recommends that this device is handled with
appropriate precautions.
Recommended Operation Conditions
Parameter
Operating Temperature
Supply Voltage
Input Clock Frequency (1)
Output Load Capacitance
Symbol
Conditions
Min
Typ
Max
Unit
Ta
-10
85
°C
VDD
3.0
3.3
3.6
V
24
32
MHz
128
MHz
Fin 1
Crystal
16
Fin 2
External Reference Clock Input
16
Cp1
Output Frequency 16 – 67MHz
15
pF
Output Frequency 67 –100MHz
10
pF
Output Frequency 100 – 128MHz
8
pF
Note:
(1) Frequency range to operate is required to select by pin-setting of FR0 (Pin 8) and FR1 (Pin 9). See
Table for the frequency range selection.
MS0548-E-03
Nov-09
-3-
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
High Level Input Voltage 1
VIH 1
Pin: S0,S1,FR0, FR1
Low Level Input Voltage 1
VIL 1
Pin: S0,S1,FR0, FR1
High Level Input Voltage 2
VIH 2
Pin: C/D/OFF
Low Level Input Voltage 2
VIL 2
Pin: C/D/OFF
Mid Level Input Voltage 2
VIM 2
Pin: C/D/OFF
0.45VD
High Level Input Voltage 3
VIH 3
Pin: XIN
08VDD
Low Level Input Voltage 3
VIL 3
Pin: XIN
Input Current
IL
High Level Output
Voltage
VOH
Low Level Output
Voltage
VOL
Current Consumption
IDD
Pin: S0,
C/D/OFF
S1,
TYP
MAX
Unit
08VDD
V
0.2VDD
0.8VDD
FR0,
Pin: CLKOUT
IOH=-4mA
FR1,
V
V
0.15VDD
V
0.50VD 0.55VDD
V
V
-20
0.2VDD
V
+20
μA
0.8VDD
V
Pin: CLKOUT
0.2VDD
IOL=+4mA
V
No load, Ta=25℃
2.5
Spread Spectrum Mode
(2)
selection by note
mA
(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
Output Clock Duty Cycle(4)
(4)
Output Clock Rise Time
(4)
Output Clock Fall Time
Output Clock Jitter
TYP
MAX
Unit
40
50
60
%
trise
1.2
ns
tfall
1.2
ns
Jit 1
Jit 2
Output Lock Time(3)
MIN
tlock
Cycle-to-cycle
1σ, 1x
Cycle-to-cycle
Peak-to-peak, 1x
Power-up
5
100
ps
600
ps
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
Nov-09
MS0548-E-03
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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
Modulation Frequency(5)
Conditions
MIN
fmod
Modulation Ratio
@ Center Spread
Mod C
Modulation Ratio
@ Down Spread
Mod D
Average Modulation
(6)
Frequency Offset
@ Down Spread
fmod-off
TYP
38.46
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
-1.2
Ratio Selection Pin S[1:0]=HH
-1.8
MAX
Unit
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:
32-64MHz:
64-128MHz:
64-128MHz, x4 Output mode:
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
Where, fin is an input frequency of crystal or reference clock input.
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 All integrated circuits form Asahi Kasei Microdevices Corporation (AKM)
assembled in “lead-free” packages* are fully compliant with RoHS.
(*) RoHS compliant products from AKM are identified with “Pb free” letter indication on product label posted on the
anti-shield bag and boxes.
(6) .
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-03
Nov-09
-5-
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
L
L
L
H
H
L
H
H
Input
Frequency (MHz)
16 – 32
32 – 64
64 – 128
16 – 32
Output
Frequency (MHz)
16 – 32
32 – 64
64 – 128
64 – 128
Input Frequency
Scaling
x1
x4
Applicable Input
Crystal
Clock
9
9
9
9
9
9
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 AKM’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
C/D/OFF
L
M
H
Modulation Mode
Down Spread
No Modulation
Center Spread
Table 3: Modulation Ratio Setting
Pin Setting
S1
S0
L
L
L
H
H
L
H
H
Modulation Ratio (%)
Center Spread Mode
Down Spread Mode
-1.0
± 0.5
- 0.5
± 0.25
-2.0
± 1.0
- 3.0
± 1.5
Nov-09
MS0548-E-03
-6-
AK8126
Package Information
• Mechanical data
0 ~ 10°
2.9 ± 0.2
+0.1
0.127 -0.05
5
0.2 ± 0.1
+0.1
0.1 -0.05
1.0
MAX
0.5
0.55 ± 0.2
2.8 ± 0.2
1
4.0 ± 0.2
6
10
Unit: mm
• Marking
10
b
6
d
c
AKM
8126
XXX
a
1
a:
b:
c:
d
#1 Pin Index
Part number
Date code (3 digits)
Product Family Logo (1)
5
• RoHS Compliance
MS0548-E-03
Nov-09
-7-
AK8126
IMPORTANT NOTICE
z 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 Microdevices Corporation (AKM) or authorized distributors as to current status of the products.
z AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the
application or use of any information contained herein.
z 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.
z AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life
support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use,
except for the use approved with the express written consent by Representative Director of AKM. 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.
z It is the responsibility of the buyer or distributor of AKM 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 AKM harmless
from any and all claims arising from the use of said product in the absence of such notification.
Asahi Kasei EMD Corporation has changed its company name to Asahi Kasei
Microdevices Corporation (AKM) effective 1st April 2009.
It is noted the documents according to this product, which was released before the date
of 1st April 2009, shall include the old company name as Asahi Kasei EMD Corporation
(AKEMD). These documents will be continuously valid by interpreting the old company
name to the new one as Asahi Kasei Microdevices Corporation (AKM).
Further information of this company name change, contact AKM’s sales person or
AKM’s authorized distributor.
Nov-09
MS0548-E-03
-8-
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