AK8141

ASAHI KASEI EMD CORPORATION
Register Programmable
Clock Generator
AK8141
Features
·
·
·
·
·
·
·
·
Description
The AK8141 is a single clock generator IC with an
integrated PLL. It can generate a 27.0MHz –
50.0MHz by 1MHz step or 33.75MHz, 40.5MHz,
49.5MHz clock from a 48MHz, 24MHz, 12MHz and
27MHz master clock input frequency. The output can
be enabled or disabled with pin and the frequency
can be changed via three-line serial interface. The
high performance PLL locks to the master clock
input, generating a low jitter, highly accurate clock
output without an external crystal.
Input Frequency:
48MHz/24MHz/12MHz/27MHz (Selectable)
Output Frequency:
27MHz – 50MHz by 1MHz step,
33.75MHz/40.5MHz/49.5MHz (Selectable)
Low Jitter Performance:
15 ps (Typ.) Period 1s
Low Current Consumption:
3.5mA (Typ.) at 27MHz, 3.0V
4.5mA (Typ.) at 50MHz, 3.0V
Output Load:
15pF(Max)
Supply Voltage:
2.7 – 3.6V
Operating Temperature Range:
-20 to +85℃
Package:
8-pin USON
Applications
·
·
Digital Still Camera
Digital Video Camera
Block Diagram
VDD
CLKIN
INPUT
Buffer
PLL
VSS
OUTPUT
Buffer
CLKOUT
OE
Register
XLAT
SCLK SDATA
AK8141 Register Programmable Clock Generator
MS0607-E-00
May-08
1
The brand name
of AKEMD’s IC’s
AK8141
PIN DESCRIPTION
Package: 8-Pin USON ( Top View)
Pin No.
Pin
Name
Pin
Type
1
OE
IN
2
3
VDD
VSS
---
4
CLKOUT
OUT
5
SDATA
6
SCLK
IN
IN
7
XLAT
IN
8
CLKIN
IN
Description
CLKOUT output enable control
“L”: CLKOUT=”L” and power down. “H”: active
Power supply
Ground
Clock output
Output clock frequency is selectable to 27.0MHz or 50.0MHz
by 1MHz step, or 33.75MHz, 40.5MHz, 49.5MHz through the
three-line serial interface. In power down mode (OE = “L”),
this pin is “L”.
Serial data input
Serial clock input
Serial write control
8-bits serial data is stored at the rising edge of this input.
Set “H” except during serial write process
Clock input
Input frequency is selected from 48MHz, 24MHz, 12MHz or
27MHz via the serial interface. Place the AK8141 in power
down (OE = “L”) mode when an input clock is not supplied.
Unstable input to the CLKIN causes the unstable CLKOUT
signal. DC input to the CLKIN also causes the unstable
CLKOUT signal.
(1)
(1)
(1) Internal pull down 100kW (Typ.)
Ordering Information
Part Number
Marking
Shipping Packaging
Package
Temperature
Range
AK8141U
8141
Tape and Reel
8-pin USON
-20 to 85 ℃
May-08
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The brand name
of AKEMD’s IC’s
AK8141
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. AKEMD recommends that this device is handled with appropriate
precautions.
Recommended Operation Conditions
Parameter
Operating Temperature
Supply Voltage
Input Clock Frequency
Symbol
Conditions
Ta
-20
VDD
2.7
Fin
Cp1
Typ
3.0
Max
Unit
85
°C
3.6
V
48.0
24.0
12.0
27.0
50
Input Clock Duty Cycle
Output Load Capacitance
Min
Pin: CLKOUT
MS0607-E-00
MHz
%
15
pF
May-08
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The brand name
of AKEMD’s IC’s
AK8141
DC Characteristics
All specifications at VDD: over 2.7 to 3.6V, Ta: -20 to +85℃, unless otherwise noted
Parameter
Symbol
Conditions
Min
Typ
High level input voltage
VIH
Pin: CLKIN, OE, XLAT,
SCLK, SDATA
0.7*VDD
Low level input voltage
VIL
Same as above
Input leakage current 1
IL 1
Pin: CLKIN, SCLK, SDATA
Input leakage current 2
IL 2
Input leakage current 3
IL 3
High level output voltage
VOH
Low level output voltage
VOL
Current Consumption1
IDD1
Max
Unit
V
0.3*VDD
V
-10
+10
µA
OE
-10
+75
µA
XLAT
-75
+10
µA
CLKOUT
IOH= -4mA
(VDD=3.0V, Ta=25°C)
CLKOUT
IOL = +4mA
(VDD=3.0V, Ta=25°C)
No load
0.8*VDD
V
0.2*VDD
CLKIN=48MHz
CLKOUT=27MHz
V
3.5
mA
4.5
mA
(VDD=3.0V, Ta=25℃)
No load
Current Consumption2
CLKIN=48MHz
IDD2
CLKOUT=50MHz
(VDD=3.0V, Ta=25℃)
Power down current
OE=”L”
Ipd
0
FSEL=”L” or open
10
μA
AC Characteristics
All specifications at VDD: over 2.7 to 3.6V, Ta: -20 to +85℃, unless otherwise noted
Parameter
Symbol
Conditions
Output Clock Duty Cycle(2) (3)
(2) (3)
Output Clock Rise Time
MIN
TYP
MAX
Unit
45
50
55
%
trise
0.2VDD to 0.8VDD
4.0
ns
Output Clock Fall Time
tfall
0.2VDD to 0.8VDD
4.0
ns
Output Clock Jitter (2) (3)
Jit
Period, 1s
tlock
Power-up
(2) (3)
(1)
Output Lock Time
15
ps
1
ms
(1) The time that output reaches the target frequency within accuracy of ±0.1% from the point that the power
supply reaches VDD
(2) With the load capacitance specified by the recommended operation conditions
(3) Design value
May-08
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The brand name
of AKEMD’s IC’s
AK8141
Serial Interface
t3
SDATA
t4
D0
t1
D1
A6
A7
t2
SCLK
t6
t5
t7
XLAT
Note) It might cause a write access if SCLK rise while XLAT stay at “Low”.
Symbol
Parameter
Min
Typ
Max
Unit
t1,t2
SCLK pulse width
50
ns
t3
SDATA setup time
50
ns
t4
SDATA hold time
50
ns
t5
SCLK rising edge to XLAT falling edge
50
ns
t6
XLAT pulse width
50
ns
t7
XLAT rising edge to SCLK falling edge
50
ns
MS0607-E-00
May-08
-5-
The brand name
of AKEMD’s IC’s
AK8141
Package Information
· Mechanical data (Units:mm)
· Marking
a: #1 Pin Index
b: Part number
c: Date code (3 digits)
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.
May-08
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The brand name
of AKEMD’s IC’s
AK8141
Functional Description
Register map
AK8141 has one 8-bit register. The register map is shown below.
Address
Data
A[7:0]
D7
D6
D5
D4
D3
D2
D1
D0
FFh
INFRQ1
INFRQ0
0
OUTFRQ4
OUTFRQ3
OUTFRQ2
OUTFRQ1
OUTFRQ0
Note) D5 should be set to “0”.
Register setting
The data for the register is set via the serial interface such as SCLK pin, SDATA pin and XLAT pin.
It is recommended that the register access is executed while OE pin = ”L”.
Important
It must be set the appropriate data to the register as the procedure shown below after power up. The AK8141
does not have a reset function on the register.
<Register setting procedure after power up>
1) Power up with OE=”L”.
2) Set values to the register.
3) Set OE=”H”.
Register bit Function
INFRQ1-0 [Write]
Input clock frequency is configured with these bits.
INFRQ1
INFRQ0
Input frequency
0
0
48MHz
0
1
24MHz
1
0
12MHz
1
1
27MHz
MS0607-E-00
May-08
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The brand name
of AKEMD’s IC’s
AK8141
OUTFRQ4-0 [Write]
Output clock frequency is configured with these bits.
OUTFRQ4
OUTFRQ3
OUTFRQ2
OUTFRQ1
OUTFRQ0
CLKOUT
0
0
0
0
0
27.00MHz
0
0
0
0
1
28.00MHz
0
0
0
1
0
29.00MHz
0
0
0
1
1
30.00MHz
0
0
1
0
0
31.00MHz
0
0
1
0
1
32.00MHz
0
0
1
1
0
33.00MHz
0
0
1
1
1
33.75MHz
0
1
0
0
0
34.00MHz
0
1
0
0
1
35.00MHz
0
1
0
1
0
36.00MHz
0
1
0
1
1
37.00MHz
0
1
1
0
0
38.00MHz
0
1
1
0
1
39.00MHz
0
1
1
1
0
40.00MHz
0
1
1
1
1
40.50MHz
1
0
0
0
0
41.00MHz
1
0
0
0
1
42.00MHz
1
0
0
1
0
43.00MHz
1
0
0
1
1
44.00MHz
1
0
1
0
0
45.00MHz
1
0
1
0
1
46.00MHz
1
0
1
1
0
47.00MHz
1
0
1
1
1
48.00MHz
1
1
0
0
0
49.00MHz
1
1
0
0
1
49.50MHz
1
1
0
1
0
50.00MHz
1
1
0
1
1
(*1)
1
1
1
0
0
(*1)
1
1
1
0
1
(*1)
1
1
1
1
0
(*1)
1
1
1
1
1
(*1)
(*1) 40.5MHz
May-08
MS0607-E-00
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The brand name
of AKEMD’s IC’s
AK8141
IMPORTANT NOTICE
· These products and their specifications are subject to change without notice. Before considering any
use or application, consult the Asahi Kasei Microsystems Co., LTD. (AKM) sales office or authorized
distributor concerning their current status.
· AKM assumes no liability for infringement of any patent, intellectual property, or other right 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.
· AKM products are neither intended nor authorized for use as critical components in any safety, life
support, or other hazard related device or system, and AKM assumes no responsibility relating to any
such use, except with the express written consent of the Representative Director of AKM. As used
here:
(a) A hazard related device or system is one designed or intended for life support or maintenance of
safety or for application 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.
(b) 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.
· It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or
otherwise places the product with a third party to notify that 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.
MS0607-E-00
May-08
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