SM802110
ClockWorks™ CPRI 153.6MHz
Ultra-Low Jitter, LVPECL
Frequency Synthesizer
General Description
The SM802110 is a member of the ClockWorks™ family of
devices from Micrel and provides an extremely low-noise
timing solution for CPRI clock signals. It is based upon a
unique patented RotaryWave
®
architecture that provides
very low phase noise.
The device operates from a 3.3V or 2.5V power supply
and synthesizes an LVPECL output clock at 153.6MHz.
The SM802110 accepts a 30.72MHz LVCMOS reference
clock.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
•
Generates an LVPECL clock outputs at 153.6MHz
•
2.5V or 3.3V operating range
•
Typical phase jitter @ 153.6MHz
(2MHz to 20MHz): 99fs (typical) at 3.3V
•
Industrial temperature range
•
Green, RoHS, and PFOS compliant
•
Available in 24-pin 4x4mm QFN
Applications
•
CPRI
•
OBSAI
___________________________________________________________________________________________________________
Block Diagram
ClockWorks is a trademark of Micrel, Inc
RotaryWave is a registered trademark of Multigig, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
January 2011
M9999-012111-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802110
Ordering Information
Part Number
SM802110UMG
SM802110UMGR
Note:
1. Devices are Green, RoHS, and PFOS compliant.
Marking
802110
802110
Shipping
Tube
Tape & Reel
Junction Temperature Range
(1)
–40°C to +85°C
–40°C to +85°C
Package
24-Pin QFN
24-Pin QFN
Pin Configuration
24-Pin QFN
(Top View)
Pin Description
Pin Number
16, 17
1, 18
2, 22
3, 4, 20,
21, 23, 24
Pin Name
/Q, Q
VDDO
VSSO
NC
Pin Type
O, (DIF)
PWR
PWR
Pin Level
LVPECL
Pin Function
Differential Clock Output
Power Supply for Clock Output
Power Supply Grounds for Clock Output
No Connect, Do not connect anything to these pins.
PLL Bypass, Selects Output Source
5
PLL_BYPASS
I, (SE)
LVCMOS
0 = Normal PLL Operation
1 = Output from Input Reference Clock
45KΩ pull-down
7, 10, 11,
12, 15, 19
8
9
6, 13, 14
TEST
VDD
REF_IN
VSS
PWR
I, (SE)
PWR
LVCMOS
Factory Test Pins. Do not connect anything to these pins.
Core Power Supply
Reference Clock Input
Core Power Supply Ground.
January 2011
2
M9999-012111-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802110
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
, V
DDO
) .........................................+4.6V
Input Voltage (V
IN
) ..............................
−0.50V
to V
DD
+
0.5V
Lead Temperature (soldering, 20sec.)....................... 260°C
Case Temperature ..................................................... 115°C
Storage Temperature ................................–65°C to +150°C
Operating Ratings
(2)
Supply Voltage (V
DD
, V
DDO
) .................. +2.375V to +3.465V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Resistance
(3)
QFN (θ
JA
)
Still-Air.........................................................50°C/W
QFN (ψ
JA
)
Junction-to-Board........................................30°C/W
DC Electrical Characteristics
(4)
V
DD
= V
DDO
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
Symbol
Parameter
Condition
Min.
2.375
3.135
Typ.
2.5
3.3
77
Max.
2.625
3.465
98
Units
V
V
mA
V
DD
, V
DDO
V
DD
, V
DDO
I
DD
2.5V Operating Voltage
3.3V Operating Voltage
Supply current, V
DD
+ V
DDO
Outputs open
LVPECL DC Electrical Characteristics
(4)
V
DD
= V
DDO
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
R
L
= 50Ω to V
DDO
−
2V
Symbol
Parameter
Condition
Min.
V
DDO
– 1.145
V
DDO
– 1.945
0.6
Typ.
V
DDO
– 0.97
V
DDO
– 1.77
0.8
Max.
V
DDO
– 0.845
V
DDO
– 1.645
1.0
Units
V
V
V
V
OH
V
OL
V
SWING
Note:
1.
Output High Voltage
Output Low Voltage
Output Voltage Swing
Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB.
The circuit is designed to meet the AC and DC specifications shown in the above table(s) after thermal equilibrium has been established.
2.
3.
4.
January 2011
3
M9999-012111-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802110
LVCMOS (PLL_BYPASS) DC Electrical Characteristics
(4)
V
DD
= 3.3V ±5% or 2.5V ±5%, T
A
= –40°C to +85°C.
Symbol
Parameter
Condition
Min.
2
−0.3
Typ.
Max.
V
DD
+
0.3
0.8
150
−5
Units
V
V
μA
μA
V
IH
V
IL
I
IH
I
IL
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
DD
= V
IN
= 3.465V
V
DD
= 3.465V, V
IN
= 0V
REF_IN DC Electrical Characteristics
(4)
V
DD
= 3.3V ±5% or 2.5V ±5%, T
A
= –40°C to +85°C.
Symbol
Parameter
Condition
Min.
1.1
−0.3
Typ.
Max.
V
DD
+
0.3
0.6
5
Units
V
V
μA
V
IH
V
IL
I
IN
Input High Voltage
Input Low Voltage
Input Current
V
DD
= 3.465V, V
IN
= 0V to V
DD
−5
AC Electrical Characteristics
(4, 5)
V
DD
= V
DDO
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
R
L
= 50Ω to V
DDO
−
2V
Symbol
Parameter
Condition
Min.
Typ.
153.6
30.72
Max.
Units
MHz
MHz
350
52
20
ps
%
ms
fs
F
OUT
F
REF
T
R
/T
F
ODC
T
LOCK
T
jit
(∅)
Output Frequency
Reference Input Frequency
LVPECL Output Rise/Fall Time
Output Duty Cycle
PLL Lock Time
RMS Phase Jitter
(6)
Spurious Noise Components
Output = 153.6 MHz Integration
Range (2MHz – 20MHz)
30.72MHz
20% – 80%
80
48
175
50
99
−70
dBc
Notes:
5.
6.
All phase noise measurements were taken with an Agilent 5052B phase noise system.
Ref_IN driven with a low noise source ClockWorks SM802001 programmed for a 30.77MHz CMOS output.
January 2011
4
M9999-012111-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802110
Phase Noise Plot
153.8MHz 2MHz-20MHz 99fS
Output is 153.85MHz with a 30.77MHz Input
January 2011
5
M9999-012111-A
hbwhelp@micrel.com
or (408) 955-1690
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