AK8126B

ASAHI KASEI EMD CORPORATION
Spread Spectrum
Clock Generator
AK8126B
Description
Features
The AK8126B 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 AK8126B 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:
90MHz – 128MHz
1X or
Convert 27MHz to 100MHz
(3.7X)
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
27.04KHz – 38.46KHz
**: Patent pending
Input Frequency Range:
Applications
- Crystal: 27.000MHz
- Reference Clock Input : 90MHz – 128MHz
Digital TV Sets
Display Panels
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
PC graphics board
Low Jitter Performance:
60 ps (Max.) cycle to cycle jitter 1σ
200 ps(Max) cycle to cycle jitter peak
Low Current Consumption:
4.5mA (Typ.) at 100MHz, 3.3V
Supply Voltage:
3.0 – 3.6V
Operating Temperature Range:
-10 to +85℃
Package:
10-pin TMSOP (Thin Miniature SOP )
Lead Free & Halogen Free
Block Diagram
XIN
*
C1
C2
XOUT
S1
* Capacitors, C1
Crystal
Oscillator
CKOUT
with Spread
Spectrum
modulator
S0
and C2 are
required for C/D/OFF
Crystal input.
PLL
Control
Logic
FR0
N.C.
VSS
VDD
AK8126B Spread Spectrum Clock Generator
MS1047-E-00
Mar-09
-1-
The brand name
of AKEMD’s IC’s
AK8126B
Pin Descriptions
XIN
10
1
2
XOUT
VSS
S1
9
8
7
N.C.
6
CKOUT
3
4
5
S0
Package: 10-Pin TMSOP (Top View)
C/D/OFF
FR0
VDD
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
N.C.
NC
Connect to VDD or GND
(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
AK8126B
126B
Tape and Reel
10-pin TMSOP
-10 to 85 ℃
Mar-09
MS1047-E-00
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The brand name
of AKEMD’s IC’s
AK8126B
Absolute Maximum Rating
Over operating free-air temperature range unless otherwise noted
Items
(1)
Symbol
Supply Voltage
Ratings
Unit
V
VDD
-0.3 to 4.6
Input Voltage
Vin
VSS-0.3 to VDD+0.3
V
Input Current (any pins except supplies)
IIN
±10
mA
Tstg
-55 to 130
°C
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. AKEMD recommends that this device is handled with
appropriate precautions.
Recommended Operation Conditions
Parameter
Symbol
Operating Temperature
Supply Voltage
Conditions
Min
Typ
Max
Unit
Ta
-10
85
°C
VDD
3.0
3.3
3.6
V
24.3
27
32.4
MHz
24.3
27
32.4
MHz
128
MHz
10
pF
8
pF
Fin 1
Crystal
External Reference Clock Input
Fin2≦100MHz
Input Clock Frequency
Amplitude: More than 1Vpp
(1)
Fin 2
Duty: 30%-70%
Fin>100MHz
Amplitude: More than 1.2Vpp
90
Duty: 40%-60%
Output Frequency
Output Load Capacitance
Cp1
90MHz to Less than 100MHz
Output Frequency
100MHz
to 128MHz
Note:
(1) Frequency range to operate is required to select by pin-setting of FR0.
range selection.
MS1047-E-00
See Table for the frequency
Mar-09
-3-
The brand name
of AKEMD’s IC’s
AK8126B
DC Characteristics
All specifications at VDD: over 3.0 to 3.6V, Ta: -10 to +85℃, Output Frequency: over specified frequency,
unless otherwise noted
Parameter
Conditions
Symbol
High Level Input Voltage 1
VIH 1
Pin: S0,S1,FR0
Low Level Input Voltage 1
VIL 1
Pin: S0,S1,FR0
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
Input Current
IL
High Level Output
Voltage
VOH
Low Level Output
Voltage
VOL
Pin: S0, S1, FR0, C/D/OFF
Pin: CLKOUT
IOH=-4mA
MIN
TYP
MAX
Unit
08VDD
V
0.2VDD
0.8VDD
0.45VD
V
V
0.15VDD
V
0.50VD 0.55VDD
V
-20
μA
+20
0.8VDD
V
Pin: CLKOUT
0.2VDD
IOL=+4mA
V
No load, Ta=25℃
Current Consumption
IDD
Input frequency 100MHz
4.5
Spread Spectrum Mode
(2)
selection by note
mA
(2) In the mode of center spread ±1.0%
AC Characteristics
All specifications at VDD: over 3.0 to 3.6V, Ta: -10 to +85℃, Output Frequency: over specified frequency,
unless otherwise noted
Parameter
Symbol
Output Clock Duty Cycle
Output Clock Rise Time
Output Clock Fall Time
(4)
(4)
(4)
trise
tfall
Jit 1
Output Clock Jitter
Jit 2
Output Lock Time
(3)
Conditions
tlock
MIN
TYP
MAX
Unit
40
50
60
%
1.2
ns
1.2
ns
Cycle-to-cycle
1σ, 1x,3.7X @100MHz
1000 cycles
Cycle-to-cycle
Peak, 1x,3.7X @100MHz
10000 cycles
Power-up
5
60
ps
200
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
Mar-09
MS1047-E-00
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The brand name
of AKEMD’s IC’s
AK8126B
Definition of Jitters
1. Cycle to cycle jitter: The variation in cycle time of a single between adjacent cycles, over a random
sample of adjacent cycle pairs.
1/2VDD
CKOUT
tcycle n
CCJ = | tcyclen -
tcycle n+1
tcyclen+1 | : where tcycle n and tcyclen+1 are any two adjacent cycles measured on
controlled edges.
MS1047-E-00
Mar-09
-5-
The brand name
of AKEMD’s IC’s
AK8126B
Spread Spectrum Modulation Characteristics
All specifications at VDD: over 3.0 to 3.6V, Ta: -10 to +85℃, Output Frequency: over specified frequency,
unless otherwise noted
Parameter
Conditions
Symbol
Modulation Frequency
(5)
MIN
fmod
Modulation Ratio
@ Center Spread
Mod C
Modulation Ratio
@ Down Spread
Mod D
Average Modulation
(6)
Frequency Offset
@ Down Spread
fmod-off
Average Modulation
(6)
Frequency Offset
@ Down Spread
27MHz to 100MHz mode
fmod-off
TYP
27.04
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
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
-1.8
-0.375
-0.625
-1.25
Ratio Selection Pin S[1:0]=HH
-1.875
(5) Modulation frequency is determined by input frequency range.
theoretical modulation frequency of AK8126B.
Output Frequency Range 90-128MHz:
MAX
Unit
38.46
kHz
%
%
%
%
Following equations provide the
fmod(KHz) = 19.23KHz x fin(MHz) / 64MHz
27MHz to 100MHz convert mode: fmod(KHz) = 31.25kHz
@100MHz
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
Mar-09
MS1047-E-00
-6-
The brand name
of AKEMD’s IC’s
AK8126B
Operation Clock Frequency Range Selection
The AK8126B operates at a wide frequency rage to support clocking in most of Home AV products. The
operation frequency range applying to the AK8126B is required to select by pin-setting of FR0 (Pin8) , as
shown in Table 1.
Table 1: Operation Clock Frequency Setting
Pin Setting
FR0
L
H
Input
Frequency
(MHz)
90 – 128
24.3 – 32.4
Output
Frequency (MHz)
90 – 128
90 – 120
Applicable Input
Input Frequency
Scaling
Crystal
Clock
X3.7
ü
ü
ü
Spread Spectrum Modulation Selection
The AK8126B 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
AK8126B 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
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
MS1047-E-00
Mar-09
-7-
The brand name
of AKEMD’s IC’s
AK8126B
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
AKM
126B
8126
XXX
XXX
a
1
a:
b:
c:
d
#1 Pin Index
Part number
Date code (3 digits)
(1)
Product Family Logo
5
(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.
Mar-09
MS1047-E-00
-8-
The brand name
of AKEMD’s IC’s
AK8126B
IMPORTANT NOTICE
l 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.
l AKEMD assumes no liability for infringement of any patent, intellectual property, or other rights in the
application or use of any information contained herein.
l 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.
l AKEMD products are neither intended nor authorized for use as critical components Note1) in any safety, life
support, or other hazard related device or system Note2), and AKEMD assumes no responsibility for such use,
except for the use approved with the express written co nsent 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.
l 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.
MS1047-E-00
Mar-09
-9-
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