P1819 D

P1819
Notebook LCD Panel EMI
Reduction IC
Features
• FCC approved method of EMI attenuation.
• Provides up to 15dB EMI reduction.
• Generates a low EMI Spread Spectrum clock and a
non-spread reference clock of the input frequency.
• Optimized for Frequency range from 20 to 40MHz.
• Internal loop filter minimizes external components
and board space.
• Selectable spread options: Down and Center.
• Low Inherent Cycle-to-Cycle jitter.
• Two different deviation selections.
• ModRate is compliant with ATI M7x VGA spec.
• 3.3V ± 0.3V Operating Voltage range.
clock and data dependent signals. The P1819 allows
significant system cost savings by reducing the number of
circuit board layers, ferrite beads, shielding, and other
passive components that are traditionally required to pass
EMI regulations.
The P1819 modulates the output of a single PLL in order
to “spread” the bandwidth of a synthesized clock, and
more importantly, decreases the peak amplitudes of its
harmonics. This result in significantly lower system EMI
compared to the typical narrow band signal produced by
oscillators and most frequency generators. Lowering EMI
by increasing a signal’s bandwidth is called ‘Spread
Spectrum Clock Generation’.
The P1819 is available in different spread deviation, refer
to Spread Deviation Selection Table.
• Low power CMOS design.
• Supports notebook VGA and other LCD timing
controller applications.
The P1819 uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
• Power Down function for mobile application.
• Available in 8-pin SOIC Package.
Product Description
Applications
The P1819 is a Versatile Spread Spectrum Frequency
Modulator designed specifically for input clock
frequencies from 20 to 40MHz. (Refer to Input Frequency
and Modulation Rate Table). The P1819 reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of down stream
The P1819 is targeted towards EMI management for
memory and LVDS interfaces in mobile graphic chipsets
and high-speed digital applications such as PC peripheral
devices, consumer electronics, and embedded controller
systems.
Block Diagram
VDD
D_C/NC PD# SRS
Crystal
Oscillator
XOUT
PLL
Modulation
XIN / CLKIN
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
REF
VSS
©2010 SCILLC. All rights reserved.
NOVEMBER 2010 – Rev. 3.1
Publication Order Number:
P1819/D
P1819
Pin Configuration
XIN / CLKIN 1
8
XOUT
7
VDD
VSS
XIN / CLKIN 1
8
XOUT
7
VDD
VSS
2
SRS
3
6
PD#
D_C / NC 3
6
PD#
ModOUT 4
5
REF
ModOUT 4
5
REF
P1819 B
2
P1819 G
Pin Description
Pin#
Pin Name
Type
Description
1
XIN / CLKIN
I
Crystal Connection or external frequency input. This pin
has dual functions. It can be connected to either an
external crystal or an external reference clock.
2
VSS
P
Ground Connection. Connect to system ground.
SRS
I
P1819B
P1819G
1
2
3
Spread range select. Digital logic input used to select
frequency deviation (Refer to Spread Deviation Selection
Table). This pin has an internal pull-up resistor.
Digital logic input used to select Down (LOW) or Center
(HIGH) spread options (Refer to Spread Deviation
Selection Table). This pin has an internal pull-up
resistor.
Spread spectrum clock output. (Refer to Input Frequency
and Modulation Rate Table and Spread Deviation
Selection Table).
Non-modulated Reference clock output of the input
frequency.
Power down control pin. Pull XIN/CLKIN and PD# LOW
to enable Power-Down mode. This pin has an internal
pull-up resistor.
3
3
D_C / NC
I
4
4
ModOUT
O
5
5
REF
O
6
6
PD#
I
7
7
VDD
P
Power Supply for the entire chip.
8
8
XOUT
O
Crystal Connection. Input connection for an external
crystal. If using an external reference, this pin must be
left unconnected.
Note: Pin 3 is NC in P1819Q.
Input Frequency and Modulation Rate
Part Number
Input Frequency Range
Output Frequency range
Modulation rate
P1819
20MHz to 40MHz
20MHz to 40MHz
Input Frequency / 896
Rev.3 | Page 2 of 6 | www.onsemi.com
P1819
Spread Deviation Selection
Part Number
P1819B
P1819G
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
SRS
0
1
NA
D_C
Spread Deviation
-1.25% (DOWN)
NA
-1.75% (DOWN)
0
-1.75% (DOWN)
1
±0.875% (CENTER)
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +4.6
V
Storage temperature
-65 to +125
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
2
KV
TDV
Static Discharge Voltage
(As per JEDEC STD22- A114-B)
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
Operating Conditions
Symbol
VDD
Parameter
Min
Max
Unit
Supply Voltage
3.0
3.6
V
-40
TA
Operating temperature
+85
°C
CL
Load Capacitance
15
pF
CIN
Input Capacitance
7
pF
Rev.3 | Page 3 of 6 | www.onsemi.com
P1819
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input Low voltage
VSS–0.3
0.8
V
VIH
Input High voltage
2.0
VDD+0.3
V
IIL
Input Low current (inputs D_C, PD#, SRS)
-60.0
-20.0
µA
IIH
Input High current
1.0
µA
12.0
mA
IXOL
XOUT Output low current @ 0.4V, VDD = 3.3V
IXOH
XOUT Output high current @ 2.5V, VDD = 3.3V
12.0
mA
VOL
Output Low voltage VDD = 3.3V, IOL = 20mA
0.4
V
VOH
Output High voltage VDD = 3.3V, IOH = 20mA
2.5
-
V
ICC
Dynamic supply current normal mode
3.3V and 25pF probe loading
7.1
fIN - min
26.9
fIN - max
mA
IDD
Static supply current standby mode
VDD
Operating Voltage
tON
Power up time (first locked clock cycle after power up)
ZOUT
2.0
4.5
3.0
Clock Output impedance
AC Electrical Characteristics
Symbol
fIN
Parameter
Min
3.3
mA
3.6
V
0.18
mS
50
Ω
Typ
Max
Unit
Input Frequency
20
40
MHz
fOUT
Output Frequency
20
40
MHz
1
tLH
Output Rise time(Measured from 0.8V to 2.0V)
0.66
nS
1
Output Fall time (Measured from 2.0V to 0.8V)
0.65
nS
tHL
tJC
Jitter (cycle-to-cycle)
tLTJ
Long Term Jitter,(1000 cycle) on Refout @ 27MHz
tD
-200
Output Duty cycle
475
45
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
Rev.3 | Page 4 of 6 | www.onsemi.com
200
50
pS
pS
55
%
P1819
Package Information
8-Pin SOIC Package
H
E
D
A2
A
θ
C
D
e
A1
L
B
Dimensions
Symbol
Inches
Min
Max
Millimeters
Min
Max
A1
0.004
0.010
0.10
0.25
A
0.053
0.069
1.35
1.75
A2
0.049
0.059
1.25
1.50
B
0.012
0.020
0.31
0.51
C
0.007
0.010
0.18
0.25
D
0.193 BSC
4.90 BSC
E
0.154 BSC
3.91 BSC
e
0.050 BSC
1.27 BSC
H
0.236 BSC
6.00 BSC
L
0.016
0.050
θ
0°
8°
0.41
1.27
0°
8°
Note: Controlling dimensions are millimeters
SOIC – 0.074 grams unit weight
Rev.3 | Page 5 of 6 | www.onsemi.com
P1819
Ordering Code
Part Number
Marking
Package Type
Temperature
P1819BF-08SR
ABY
8-pin SOIC, tape & reel, Pb Free
0°C to +70°C
P1819GF-08SR
ACA
8-pin SOIC, tape & reel, Pb Free
0°C to +70°C
A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
ON Semiconductor and
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising
out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC
was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe
and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable
copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303-675-2175 or 800-344-3860 Toll Free
USA/Canada
Fax: 303-675-2176 or 800-344-3867 Toll Free
USA/Canada
Email: [email protected]
N. American Technical Support: 800-282-9855
Toll Free USA/Canada
Europe, Middle East and Africa Technical
Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81-3-5773-3850
Rev.3 | Page 6 of 6 | www.onsemi.com
ON Semiconductor Website:
www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your
local Sales Representative