SM802112
ClockWorks™ 3-Output, 480MHz/80MHz,
Ultra-Low Jitter LVDS/CMOS
Frequency Synthesizer
General Description
The SM802112 is a member of the ClockWorks™ family of
devices from Micrel and provides extremely low-noise
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 two LVDS output clocks, one at 480MHz
and one at 80MHz and one LVCMOS clock at 80MHz.
The SM802112 accepts an 80MHz LVCMOS reference
clock or an 80MHz 1Vp-p sine wave.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
Generates two LVDS clock outputs, one at 480MHz and
one at 80MHz
•
Generates one LVCMOS clock output at 80MHz
•
2.5V or 3.3V operating range
•
Typical phase jitter @ 480MHz
(12kHz to 20MHz): 290fs
•
Industrial temperature range (–40°C to +85°C)
•
Green, RoHS, and PFOS compliant
•
Available in 44-pin 7mm
×
7mm QFN package
Applications
•
Set Top Box
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
September 2011
M9999-091411-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802112
Ordering Information
(1)
Part Number
SM802112UMG
SM802112UMGTR
Note:
1. Devices are Green, RoHS, and PFOS compliant.
Marking
802112
802112
Shipping
Tray
Tape and Reel
Temperature Range
–40°C to +85°C
–40°C to +85°C
Package
44-Pin QFN
44-Pin QFN
Pin Configuration
44-Pin QFN
(Top View)
Pin Description
Pin Number
28, 29
4, 5
42, 41
12, 13
31, 37, 38
16, 43, 44
10, 21, 23
24, 39
3, 6, 40
Pin Name
/Q0, Q0
/Q1, Q1
/Q2, Q2
VDD
VDDO1
VDDO2
VSS
(Exposed Pad)
VSSO1
VSSO2
Pin Type
O, (DIF)
O, (DIF)
O, (DIF)
PWR
PWR
PWR
PWR
PWR
PWR
Pin Level
LVDS
LVDS
LVCMOS
Pin Function
Differential Clock Output from Bank 1, 480MHz.
Differential Clock Output from Bank 2, 80MHz.
Differential Clock Output from Bank 2, 80MHz.
Power Supply.
Power Supply for Output Q0.
Power Supply for Outputs Q1, Q2.
Core Power Supply Ground. The exposed pad must
be connected to the VSS ground plane.
Power Supply Ground for Outputs Q0.
Power Supply Ground for Outputs Q1, Q2.
September 2011
2
M9999-091411-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802112
Pin Description (Continued)
Pin Number
17
9, 11, 14, 20,
27, 30, 30
1, 2, 7, 8, 15, 18,
19, 22, 25, 26, 32,
33, 35, 36
Pin Name
REF_IN
TEST
NC
Pin Type
I, SE
Pin Level
LVCMOS
Pin Function
Reference Clock Input, 80MHz.
Factory Test Pins. Do not connect anything to these
pins.
No Connect. Do not connect anything to these pins.
September 2011
3
M9999-091411-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802112
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
, V
DDO1/2
) ......................................+4.6V
Input Voltage (V
IN
) ..............................
−0.50V
to V
DD
+ 0.5V
Lead Temperature (soldering, 20s)............................ 260°C
Case Temperature ..................................................... 115°C
Storage Temperature (T
s
) .........................
−65°C
to
+150°C
Operating Ratings
(2)
Supply Voltage (V
DD
, V
DDO1/2
)............ +2.375V to +3.465V
Ambient Temperature (T
A
).......................–40°C to +85°C
Junction Thermal Resistance
(3)
QFN (θ
JA
)
Still-Air......................................................24°C/W
QFN (ψ
JB
)
Junction-to-Board ......................................8°C/W
DC Electrical Characteristics
(4)
V
DD
= V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
Symbol
V
DD
, V
DDO1/2
V
DD
, V
DDO1/2
I
DD
Parameter
2.5V Operating Voltage
3.3V Operating Voltage
Supply current V
DD
+ V
DDO
Outputs open
Condition
Min.
2.375
3.135
Typ.
2.5
3.3
125
Max.
2.625
3.465
158
Units
V
V
mA
LVDS DC Electrical Characteristics
(4)
V
DD
= V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
R
L
= 100Ω across Q and /Q.
Symbol
Parameter
Condition
Min.
275
1.15
Typ.
350
1.25
Max.
475
40
1.50
50
Units
mV
mV
V
mV
V
OD
ΔV
OD
V
OS
ΔV
OS
Notes:
1.
Differential Output Voltage
V
OD
Magnitude Change
Offset Voltage
V
OS
Magnitude Change
Figures 1, 4
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.
September 2011
4
M9999-091411-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SM802112
LVCMOS OUTPUT DC Electrical Characteristics
(4)
V
DD
= V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
V
DD
= 3.3V
±5%,
V
DDO1/2
= 3.3V
±5%
or 2.5V
±5%
T
A
=
−40°C
to
+85°C.
R
L
= 50Ω to V
DDO
/2.
Symbol
Parameter
Condition
Min.
V
DD0
−
0.7
0.6
Typ.
Max.
Units
V
V
V
OH
V
OL
Output High Voltage
Output Low Voltage
Figure 5
Figure 5
REF_IN DC Electrical Characteristics
(4)
V
DD
= 3.3V
±5%,
or 2.5V
±5%,
T
A
=
−40°C
to
+85°C.
Symbol
V
IH
V
IL
I
IN
Parameter
Input High Voltage
Input Low Voltage
Input Current
V
IN
= 0V to V
DD
Condition
Min.
1.1
−0.3
−5
Typ.
Max.
V
DD
+ 0.3
0.6
5
Units
V
V
μA
September 2011
5
M9999-091411-A
hbwhelp@micrel.com
or (408) 955-1690
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