AK8138MV

AK8138MV
Low Spurious
Multiclock Generator with XO
AK8138MV
Features
Description
The AK8138MV is a member of AKM’s low power
multi clock generator family designed for a high
quality audio cock with high performance C/N.
The AK8138MV generates different frequency
clocks from a 27MHz crystal oscillator or external
27MHz clock input. It provides them to up to four
outputs configured by pin-setting. Both circuitries
of XO and PLL in AK8138MV 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. The AK8138MV is available in a
16-pin SSOP package.
27MHz Crystal Input or External Input
Four Frequency-Selectable Clock Outputs
One 27MHz-Reference Output
Selectable Clock out Frequencies:
- CLK1: 24.576MHz
- CLK2: 2.048,4.096,8.192,11.2896,12.288,
22.5792MHz
- CLK3: 6.144,8.192,11.2896,12.288,
16.9344,22.5792MHz
- CLK4: 8.4672,11.2896,13.824,
16.9344MHz
Built-in XO
Low Jitter Performance
- Period Jitter:
30 psec (Typ.) at CLK1-4
- Long Term Jitter:
60 psec (Typ.) at CLK1-4
Low Current Consumption:
18.0mA (Typ.) at 3.3V, S[3:0]=’HHHH’
Supply Voltage:
2.85V to 3.6V
Operating Temperature Range:
-40℃ to +85℃
Package:
16-pin SSOP (Lead free, Halogen free)
Applications
Personal Video Recorders
Set-Top-Boxes
Multi Media Receivers
Block Diagram
VDD
XIN
Crystal
Oscillator
PLL1
PLL1
XOUT
PLL2
Divide
Logic
and
Output
Control
CLK1
CLK2
CLK3
S0
CLK4
S1
S2
REFOUT
S3
GND
AK8138MV
Multi Clock Generator
MS1211-E-01
May-11
-1-
AK8138MV
Pin Descriptions
Package: 16-Pin SSOP(Top View)
XOUT
1
16
XIN
S0
2
15
VDD3
S1
3
14
S3
S2
4
13
VDD2
VDD1
5
12
GND2
GND1
6
11
CLK4
CLK1
7
10
CLK3
CLK2
8
9
REFOUT
Pin
No.
Pin
Name
Pin
Type
1
XOUT
OUT
2
S0
IN
Clock Out Frequency select 0, See Table 2 for the selection
(1)
3
S1
IN
Clock Out Frequency select 1, See Table 2 for the selection
(1)
4
S2
IN
Clock Out Frequency select 2, See Table 2 for the selection
(1)
5
VDD1
--
Power Supply 1
6
GND1
--
Ground 1
7
CLK1
OUT
Clock output 1, See Table 1 for its selectable frequency
(2)
8
CLK2
OUT
Clock output 2, See Table 2 for its selectable frequency
(2)
9
REFOUT
OUT
Reference Clock Output of 27.000MHz Crystal or external clock
(2)
10
CLK3
OUT
Clock output 3, See Table 2 for its selectable frequency
(2)
11
CLK4
OUT
Clock output 4, See Table 2 for its selectable frequency
(2)
12
GND2
--
Ground 2
13
VDD2
--
Power Supply 2
14
S3
IN
Clock Out Frequency select 3, See Table 1 for the selection
15
VDD3
--
Power Supply 3
Description
Crystal connection, Connect to 27.000MHz crystal
Please open when an external clock input is used
(1)
Crystal connection, Connect to 27.000MHz crystal
16
XIN
IN
Or external clock input (minimum 1Vpp input).
Input becomes binary after passing an internal HPF.
Input Resistance is 37.5k-ohm.
(1) Internal pull up 360kΩ
(2) Internal pull down 510kΩ
Ordering Information
Part Number
Marking
Shipping
Packaging
Package
Temperature
Range
AK8138MV
8138MV
Tape and Reel
16-pin SSOP
-40 to 85 ℃
MS1211-E-01
May-11
-2-
AK8138MV
Absolute Maximum Rating
Over operating free-air temperature range unless otherwise noted (1)
Items
Symbol
Ratings
Unit
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
Supply voltage
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)
Output Load Capacitance
Symbol
Ta
Conditions
AK8138MV
VDD
Min
Typ
-40
2.85
3.3
Max
Unit
85
°C
3.6
V
Cp1
Pin: CLK1-4
15
pF
Cp2
Pin: REFOUT
25
pF
Note:
(1) Power to VDD1, VDD2 and VDD3 requires to be supplied from a single source. A decoupling capacitor of
0.1μF for power supply line should be installed close to each VDD pin.
MS1211-E-01
May-11
-3-
AK8138MV
DC Characteristics
All specifications at VDD: over 2.85 to 3.6V, Ta = -40 to 85 ℃ unless otherwise noted
Parameter
Symbol
Conditions
High level input voltage
VIH
Pin: S0,S1,S2,S3
Low level input voltage
VIL
Pin: S0,S1,S2,S3
Input leak current
IL
Pin: S0,S1,S2,S3
High Level output
voltage
VOH
Low level output
Voltage
VOL
Current consumption
IDD
MIN
TYP
MAX
0.7VDD
V
-20
Pin: CLK1-4, REFOUT
IOH=-4mA
Pin: CLK1-4, REFOUT
IOL=+4mA
Unit
0.3VDD
V
+10
μA
0.8VDD
V
0.2VDD
Ta=25℃, No load
18.0
S[3:0] = ‘HHHH’
V
mA
AC Characteristics
All specifications at VDD: over 2.85 to 3.6V, Ta = -40 to 85 ℃ unless otherwise noted
Parameter
Symbol
Conditions
MIN
TYP
MAX
Unit
Crystal clock frequency
Pin: XIN, XOUT
26.9
27.0000
27.1
MHz
External clock frequency
Pin: XIN(1)
26.9
27.0000
27.1
MHz
Period jitter (4)
Pin: CLK1-4(2), REFOUT (3)
(2)
Pin: CLK1-4 , REFOUT
1000cycles
Long Term jitter (4)
Output Clock duty
Cycle
Output clock rise time
ps
60
ps
Pin: CLK1-4 (2)
45
50
55
%
Pin: REFOUT (3)
40
50
60
%
trise
Pin: CLK1-4 (2), REFOUT (3)
2.5
ns
tfall
Pin: CLK1-4
(2)
2.5
ns
Pin: CLK1-4
(2)
5
ms
Output clock fall time
Output Lock Time
30
(3)
(4)
, REFOUT
(3)
(1) Amplitude is 1Vpp or more.
(2) Measured with load capacitance of 15pF
(3) Measured with load capacitance of 25pF
(4) 1σ in 10000 sampling or more
(5) The time that output reaches the target frequency within accuracy of ±0.1% from the point that the power
supply reaches VDD.
MS1211-E-01
May-11
-4-
AK8138MV
Output clock frequency selection
The AK8138MV generates a range of low-jitter and high-accuracy clock frequencies with two built-in PLLs
and provides to up to four assigned outputs. A frequency selection at assigned output pin is configured by
pin-setting of S0 (Pin2), S1 (Pin3), S2(Pin4) and S3 (Pin14).
The selectable frequency is shown in Table1.
Sampling
Frequency
(kHz)
Selection Pin
Clock Output Frequency (MHz)
CLK4
(Pin 7)
CLK2
256fs
(Pin 8)
CLK3
384fs
(Pin 10)
(Pin 11)
L
24.576
12.288
OFF
OFF
L
H
24.576
11.2896
16.9344
OFF
L
H
L
24.576
8.192
12.288
OFF
L
L
H
H
24.576
22.5792
OFF
OFF
16/22.05
H
H
L
L
24.576
4.096
11.2896
8.4672
16/44.1
H
H
L
H
24.576
4.096
22.5792
8.4672
8/16
H
H
H
L
24.576
2.048
6.144
16.9344
8/16
H
H
H
H
24.576
4.096
11.2896
11.2896
EXT1
L
L
L
L
24.576
2.048
8.192
13.824
EXT2
L
L
L
H
24.576
OFF
OFF
13.824
Reserved
L
L
H
L
OFF
OFF
OFF
OFF
Reserved
L
L
H
H
OFF
OFF
OFF
OFF
Reserved
L
H
L
L
OFF
OFF
OFF
OFF
Reserved
L
H
L
H
OFF
OFF
OFF
OFF
Reserved
L
H
H
L
OFF
OFF
OFF
OFF
Reserved
L
H
H
H
OFF
OFF
OFF
OFF
S3
S2
S1
S0
CLK1
(Pin 14)
(Pin 4)
(Pin 3)
(Pin 2)
48.0
L
L
L
44.1
L
L
32.0
L
88.2
Table 1: CLK1-4 Clock output Frequency
MS1211-E-01
May-11
-5-
AK8138MV
Typical Connection Diagram
+3.3V typ.
27.0MHz Crystal
Cext2
Cext1
AK8138MV
XIN:16
1:XOUT
SW0
2:S0
SW1
3:S1
S3:14
SW2
4:S2
VDD2:13
5:VDD1
GND2:12
6:GND1
CLK4:11
C1
C3
SW3
VDD3:15
7:CLK1
CLK3:10
8:CLK2
REFOUT:9
C2
GND
Clock Output
A: Crystal connection
+3.3V typ.
27MHz
External Clock
AK8138MV
1:XOUT
XIN:16
SW0
2:S0
VDD3:15
SW1
3:S1
S3:14
SW2
4:S2
VDD2:13
5:VDD1
GND2:12
6:GND1
CLK4:11
C1
7:CLK1
CLK3:10
8:CLK2
REFOUT:9
C3
SW3
C2
GND
Clock Output
B: External clock input
Figure 1: Typical Connection Diagram
C1-3 : 0.1μF
Cext1-2 : Depends on crystal characteristics. Refer the specification of the crystal.
SW0-3 : Open is “H” and tied to GND is “L” for S0, S1, S2 and S3, because these pins
have internal pull up resister.
MS1211-E-01
May-11
-6-
AK8138MV
PCB Layout Consideration
The AK8138MV 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 1
Power supply line – AK8138MV has three power supply pins (VDD1-3) which deliver power to internal
circuitry segments. A 0.1μF decoupling capacitor should be placed as close to each VDD pin as possible.
Ground pin connection – AK8138MV has two ground pins (GND1-2). These pin require connecting to
plane ground which will eliminate any common impedance with other critical switching signal return.
0.1μF decoupling capacitors placed at VDD1, VDD2, and VDD3 should be grounded at close to the
GND1pin, the GND2 pin, and the GND2, respectively.
Crystal connection – Proper oscillation performance are susceptible to stray or parasitic capacitors
around crystal. The wiring traces to a crystal form XIN (Pin 16) and XOUT (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.
MS1211-E-01
May-11
-7-
AK8138MV
Package Information
• Mechanical data
16pin SSOP (Unit: mm)
5.0 +0.3
-0.1
16
9
A
6.4±0.3
4.4 ±0.2
8
1
0.65
0.22±0.05
0.15±0.1
1.15 ±0.1
0.1±0.1
Detail A
0.5 ±0.2
0.1 ±0.1
0.1
0-10°
• Marking
16
b
a: #1 Pin Index
b: Part number
c: Date code (5 digits)
9
c
8138MV
XXXXX
a
1
8
• 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.
MS1211-E-01
May-11
-8-
AK8138MV
This page is intentionally blank.
MS1211-E-01
May-11
-9-
AK8138MV
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 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.
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.
MS1211-E-01
May-11
- 10 -
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