AK8135F

AK8135F
Low Power
Multiclock Generator with VCFS
AK8135F
Features
Description
AK8135F is a member of AKM’s low power multi
clock generator family designed for Recorders,
DTVs or STBs, requiring a range of system clocks
with high performance. AK8135F generates
different frequency clocks from a 24.576MHz
crystal oscillator and provides them to seven
outputs. The on-chip VCFS (Voltage Controlled
Frequency Synthesizer) accepts a voltage control
input to allow the output clocks to vary by ±85 ppm
for synchronizing to the external clock system.
Both circuitries of VCFS and PLL in AK8135F are
derived from AKM’s long-term-experienced clock
device technology, and enable clock output to
perform low jitter and to operate with very low
current consumption.
AK8135F is available in a 30-pin VSOP package.
24.576MHz Crystal Input
One 24.576MHz-Reference Output
Selectable Clock out Frequencies:
- 24.576 MHz at CLK1
- 24.99972 MHz at CLK2
- 33.332965 MHz at CLK3
- 27.000 MHz at REF1-4
Built-in two VCFS
- Pull Range: ±85ppm (typ.)
Low Jitter Performance
- Period Jitter:
150 psec (Typ.) at CLK1-3, REF1-4
- Long term jitter:
400 psec (Typ.) at CLK1-3, REF1-4
Low Current Consumption:
24 mA (Typ.) at 3.3V
Low C/N output:
72 dB (Typ.) at REF1-4
Supply Voltage:
3.0 – 3.6V
Operating Temperature Range:
-20 to +85℃
Package:
30-pin VSOP (Lead free)
Applications



HDD, DVD, BD Recorder
DTV
Set-Top-Boxes
VDD1-6
CLK1
XI
Crystal
PLL1
OSC
1/16
CLK2
1/12
CLK3
XO
REF1
REF2
VCFS1
VIN1
REF1PD
REF3
REF4
VCFS2
VIN2
REF34PD
VDD
REF34PD
VDD
REF1PD
REF34PD
TEST1
TEST4
TEST2
TEST3
GND1-7
Figure 1: AK8135F Multi Clock Generator
MS1181-E-02
Feb-11
-1-
AK8135F
Pin Descriptions
1:XO
30:GND1
2:TEST1
29:VDD1
3:XI
28:VIN1
4:TEST2
27:VIN2
5:CLK1
26:TEST3
6:REF1PD
25:VDD2
7:VDD4
24:GND2
8:GND4
23:REF1
9:REF3
22:VDD3
10:GND5
21:GND3
11:VDD5
20:REF2
12:REF4
19:REF34PD
13:GND7
VIN1
14:CLK2
18:TEST4
15:CLK3
16:GND6
17:VDD6
Figure 2: Package: 30-Pin VSOP(Top View)
Feb-11
MS1181-E-02
-2-
AK8135F
Pin No.
Pin Name
Pin Type
Description
1
XO
AO
Crystal connection, Connect to 24.576MHz crystal
2
TEST1
DI
TEST input pin, Connect to GND.
3
XI
AI
Crystal connection, Connect to 24.576MHz crystal
4
TEST2
DI
TEST input pin, Connect to GND.
5
CLK1
DO
Reference Clock Output of XO based on 24.576MHz Crystal
6
REF1PD
DI
7
VDD4
PWR
Power Supply 4
8
GND4
PWR
Ground 4
REF1 pin Mode Select pin
“H”: Enable, REF1 pin outputs 27.00MHz.
(1)
“L”: Disable, REF1 pin is “L”.
Reference Clock Output 3 from VCFS2
9
REF3
When REF34PD pin = “H”, Output frequency is 27.00MHz.
DO
When REF34PD pin = “L”, this pin is “L” output.
10
GND5
PWR
Ground 5
11
VDD5
PWR
Power Supply 5
12
REF4
DO
Reference Clock Output 4 from VCFS2
When REF34PD pin = “H”, Output frequency is 27.00MHz.
When REF34PD pin = “L”, this pin is “L” output.
13
GND7
PWR
Ground 7
14
CLK2
DO
Clock output 2, Output frequency is 25.000MHz.
15
CLK3
DO
Clock output 3, Output frequency is 33.333MHz.
16
GND6
PWR
Ground 6
17
VDD6
PWR
Power Supply 6
18
TEST4
DO
19
REF34PD
DI
20
REF2
DO
21
GND3
PWR
Ground 3
22
VDD3
PWR
Power Supply 3
23
REF1
DO
TEST output pin, this pin is “L” output and should be open.
REF3 and REF4 pins Mode Select pin, VCFS2 Power Down pin
“H”: Enable, REF3 and REF4 pins output 27.00MHz and VCFS2 is Normal Operation.
“L”: Disable, REF3 and REF4 pins are “L” and VCFS2 is powered down.
Reference Clock Output 2 from VCFS1, Output frequency is 27.00MHz.
Reference Clock Output 1 from VCFS1
When REF1PD pin = “H”, Output frequency is 27.00MHz.
When REF1PD pin = “L”, this pin is “L” output.
24
GND2
PWR
Ground 2
25
VDD2
PWR
Power Supply 2
26
TEST3
DI
TEST input pin, Connect to GND.
27
VIN2
AI
VCFS2 Control Voltage Input
28
VIN1
AI
VCFS1 Control Voltage Input
29
VDD1
PWR
Power Supply 1
30
GND1
PWR
Ground 1
(1) Internal pull up 52k
Ordering Information
Part Number
Marking
Shipping Packaging
Package
Temperature Range
AK8135F
AK8135F
Tape and Reel
30-pin VSOP
-20 to 85℃
MS1181-E-02
Feb-11
-3-
(1)
AK8135F
Absolute Maximum Rating
Over operating free-air temperature range unless otherwise noted
Items
Symbol
(1)
Ratings
Unit
Supply voltage
VDD
-0.3 to 4.6
V
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. AKM recommends that this device is handled with
appropriate precautions.
Recommended Operation Conditions
Parameter
Operating temperature
Supply voltage
(1)
Symbol
Conditions
Ta
VDD
Min
Typ
-20
Pin: VDD1-6
3.0
3.3
Max
Unit
85
C
3.6
V
Note:
(1) Power to VDD1-6 requires to be supplied from a single source.
should be installed close to each VDD pin.
Feb-11
A decoupling capacitor for power supply line
MS1181-E-02
-4-
AK8135F
DC Characteristics
VDD: over 3.0 to 3.6V, Ta: -20 to +85℃, 27MHz Crystal, unless otherwise noted
Parameter
Symbol
Conditions
High Level Input Voltage
VIH
Pin: REF1PD, REF34PD,
TEST1-3
Low Level Input Voltage
VIL
Pin: REF1PD, REF34PD,
TEST1-3
Input Current 1
IL 1
Pin: TEST1-3
Input Current 2
IL 2
Input Current 3
IL 3
Input Current 4
IL 4
High Level Output
Voltage
VOH
Low level Output
Voltage
VOL
Current Consumption 1
IDD1
Current Consumption 2
IDD2
Current Consumption 3
IDD3
Current Consumption 4
IDD4
Pin: REF1PD, REF34PD
VIH=VDD
Pin: REF1PD, REF34PD
VIL=GND
Pin: VIN1, VIN2
Pin: CLK1-3, REF1-4
IOH=-4mA
MIN
TYP
0.7VDD
0.3VDD
V
-10
+10
μA
-10
+10
μA
-25
μA
+3
μA
-134
-58
-3
0.8VDD
V
0.2VDD
V
24
32
mA
23
31
mA
17
22
mA
16
21
mA
IOL=+4mA
REF1PD=’H’, REF34PD=’H’
No load
REF1PD=’L’, REF34PD=’H’
No load
REF1PD=’H’, REF34PD=’L’
No load
REF1PD=’L’, REF34PD=’L’
MS1181-E-02
Unit
V
Pin: CLK1-3, REF1-4
No load
MAX
Feb-11
-5-
AK8135F
AC Characteristics
VDD: over 3.0 to 3.6V, Ta: -20 to +85℃, 27MHz Crystal, unless otherwise noted
Parameter
Symbol
Crystal Clock Frequency
Output Clock Accuracy
(1)
(1)
Fosc
Faccuracy
VCFS Pullable Range
PRVCFS
VCFS Response Time
RTVCFS
C/N
CN
Output Clock Rise Time 1
T_rise1
Output Clock Fall Time 1
T_fall1
Output Clock Rise Time 2
T_rise2
Output Clock Fall Time 2
T_fall2
Period Jitter
(2)
Jit_period
Long Term Jitter
(2)
Output Clock Duty Cycle
Power-up Time
(3)
Jit_long
DtyCyc
T_put
Conditions
MIN
Pin:XI,XO
Pin:CLK1 24.576MHz
Crystal CL=10[pF]
Pin:CLK2 24.99972MHz
Relative to 25.000MHz
Crystal CL=10[pF]
Pin:CLK3 33.332965MHz
Relative to 33.333MHz
Crystal CL=10[pF]
Pin:REF1-4 27.000MHz
VIN1/VIN2=0.5VDD
Crystal CL=10[pF]
Pin:REF1-4
VIN1/VIN2=0.5VDD±1.0
Pin:REF1-4
VIN1/VIN2=0.5VDD±1.0
Pin:REF1-4
with Load Cpl2=25pF
Pin:CLK1, CLK2
with Load Cpl1=15pF
0.2VDD → 0.8VDD
Pin:CLK1, CLK2
with Load Cpl1=15pF
0.8VDD → 0.2VDD
Pin:CLK3, REF1-4
with Load Cpl2=25pF
0.2VDD → 0.8VDD
Pin:CLK3, REF1-4
with Load Cpl2=25pF
0.8VDD → 0.2VDD
Pin:CLK1, CLK2
with Load Cpl1=15pF
Pin:CLK3, REF1-4
with Load Cpl2=25pF
Pin:CLK1, CLK2
with Load Cpl1=15pF
1000 cycle delay
Pin:CLK3, REF1-4
with Load Cpl2=25pF
1000 cycle delay
Pin:CLK2
with Load Cpl1=15pF
Pin:CLK3, REF1-4
with Load Cpl2=25pF
Pin: CLK1
with Load Cpl1=15pF
Pin:CLK1, CLK2
with Load Cpl1=15pF
Pin:CLK3, REF1-4
with Load Cpl2=25pF
TYP
MAX
24.576
Unit
MHz
-30
0
+30
ppm
-41
-11
+19
ppm
-41
-11
+19
ppm
-30
0
+30
ppm
±65
±85
±115
ppm
5
20
ppm/100ms
72
dB
1.5
4.0
ns
1.5
4.0
ns
2.5
4.0
ns
2.5
4.0
ns
150
(6σ)
300
(6σ)
ps
400
(6σ)
600
(6σ)
ps
45
50
55
%
40
50
60
%
1
2
ms
(1) Output Clock Accuracy depends on crystal characteristics, on-chip load capacitance, and stray capacity of
PCB. MIN., Max.=±30ppm is applied to AKM’s authorized test condition.
Please contact us when you plan the use of other crystal unit.
(2) ±3 in 10000 sampling or more
(3) Time to settle output into 0.1% of specified frequency.
Feb-11
MS1181-E-02
-6-
AK8135F
Function Description
Voltage Controlled Frequency Synthesizer (VCFS)
AK8135F has a voltage controlled frequency synthesizer (VCFS), featuring fine frequency tuning for
27MHz of primary clock frequency by external DC voltage control. This tuning enables output clock
frequency to synchronize the external clock system.
VCFS is composed of analog-to-digital converter and high resolution PLL as shown in Figure 3. VIN1
(Pin28) and VIN2 (Pin27) accept DC voltage control from a processor or a system controller, and pulls the
primary frequency of crystal to higher or lower. This pulling range is determined by supply Voltage to
AK8135F. AK8135F is designed to range ±85ppm of primary frequency, and the typical pulling profile is
shown in Figure 4.
External
LPF
AK8135F
PWM
VIN1/2
High-resolution
ADC+FLT
REF1-4
PLL
VCFS1/2
REF1-4 Frequency [ppm]
Figure 3: VCFS Diagram
+85
0
(27[MHz])
-85
0.5
0.5VDD-1.0
0.5VDD
0.5VDD+1.0 VDD-0.5
VIN1/VIN2 Input Voltage [V]
Figure 4: Typical VCFS Pulling Profile
MS1181-E-02
Feb-11
-7-
AK8135F
Typical Connection Diagram
VDD=3.3[V]
+
C7
GND
AK8135F
Cext2
1:XO
X’tal = 24.576[MHz]
2:TEST1
29:VDD1
3:XI
28:VIN1
4:TEST2
27:VIN2
5:CLK1
26:TEST3
RLPF1
C1
Cext1
PWM1
CLPF1 CLPF2
RLPF2
CLPF3 CLPF4
CLK1 = 24.576[MHz]
PWM2
6:REF1PD 25:VDD2
SW1
C4
REF3 = 27.000[MHz]
C5
REF4 = 27.000[MHz]
CLK2 = 24.99972[MHz]
7:VDD4
24:GND2
8:GND4
23:REF1
9:REF3
22:VDD3
10:VDD4
10:GND5
21:GND3
S
11:VDD5
S4
12:REF4
20:REF2
13:GND7
18:TEST4
14:CLK2
VIN1
17:VDD6
15:CLK3
16:GND6
C2
REF1 = 27.000[MHz]
C3
REF2 = 27.000[MHz]
19:REF34PD
CLK3 = 33.332965[MHz]
SW2
C6
GND
Figure 5: Typical Connection Diagram
C1, C2, C3, C4, C5, C6: 0.1μF
C7 : Electrolytic capacitor
Cext1, Cext2: Depends on crystal characteristics. Refer the specification of the crystal.
SW1, SW2: It is a switch that controls outputs of REF1, REF3 and REF4 and power up/down of
VCFS2.
RLPF1, RLPF2, CLPF1, CLPF2, CLPF3, CLPF4: In case of interface by PWM. For right configuration, refer
the specification of the applied processor.
Feb-11
MS1181-E-02
-8-
AK8135F
PCB Layout Consideration
AK8135F is a high-accuracy and low-jitter multi clock generator. For proper performances specified in this
datasheet, careful PCB layout should be taken. The followings are layout guidelines based on the typical
connection diagram shown in Figure 5
Power supply line – AK8135F has six power supply pins (VDD1-6) which deliver power to internal circuitry
segments. A 0.1F decoupling capacitor should be placed as close to each VDD pin as possible.
Ground pin connection – AK8135F has seven ground pins (GND1-7). These pin require connecting to
plane ground which will eliminate any common impedance with other critical switching signal return.
0.1F decoupling capacitors placed at VDD1, VDD2, VDD3, VDD4, VDD5, VDD6, and VDD7 should be
grounded at close to the GND1pin, the GND2 pin, the GND3 pin, the GND4 pin, the GND5 pin, the GND6
pin, and the GND7 respectively.
Crystal connection – Proper oscillation performance is susceptible to stray or parasitic capacitors around
crystal. The wiring traces to a crystal form XI (Pin 3) and XO (Pin 1) have equal lengths with no via and
as short in length as possible. These traces should be also located away from any traces with switching
signal.
MS1181-E-02
Feb-11
-9-
AK8135F
Package Information
 Marking
a: #1 Pin Index
b: Part number
c: Date code (5 digits)
30
16
b
AK8135F
xxxxx
c
a
15
1
Feb-11
MS1181-E-02
- 10 -
AK8135F
 RoHS Compliance
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.
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 Microdevices Corporation (AKM) or authorized distributors as to current
status of the products.
 Descriptions of external circuits, application circuits, software and other related information
contained in this document are provided only to illustrate the operation and application
examples of the semiconductor products. You are fully responsible for the incorporation of
these external circuits, application circuits, software and other related information in the design
of your equipments. AKM assumes no responsibility for any losses incurred by you or third
parties arising from the use of these information herein. AKM assumes no liability for
infringement of any patent, intellectual property, or other rights in the application or use of
such 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.
 AKM products are neither intended nor authorized for use as critical components Note1) 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.
 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.
MS1181-E-02
Feb-11
- 11 -
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