P1819BF-08SR [ONSEMI]
Notebook LCD Panel EMI Reduction IC; 笔记本电脑液晶面板降低EMI IC
| 型号： | P1819BF-08SR |
| 厂家： | 
ONSEMI |
| 描述： | Notebook LCD Panel EMI Reduction IC |
| 文件： | 总6页 (文件大小：168K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P1819
Notebook LCD Panel EMI
Reduction IC
Features
• FCC approved method of EMI attenuation.
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.
• 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.
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’.
• 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.
• Low power CMOS design.
The P1819 is available in different spread deviation, refer
to Spread Deviation Selection Table.
• 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
SRS
D_C/NC PD#
PLL
Modulation
XIN / CLKIN
Frequency
Divider
Crystal
Oscillator
Output
Divider
Phase
Detector
Loop
Filter
VCO
XOUT
REF
Feedback
Divider
ModOUT
VSS
©2010 SCILLC. All rights reserved.
NOVEMBER 2010 – Rev. 3.1
Publication Order Number:
P1819/D
P1819
Pin Configuration
XOUT
XOUT
1
2
3
4
8
XIN / CLKIN
8
7
6
5
XIN / CLKIN
VSS
1
2
3
4
VSS
SRS
VDD
PD#
REF
VDD
PD#
REF
7
6
5
P1819 B
P1819 G
D_C / NC
ModOUT
ModOUT
Pin Description
Pin#
Pin Name
Type
Description
P1819B
P1819G
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.
1
2
3
1
2
XIN / CLKIN
VSS
I
P
I
Ground Connection. Connect to system ground.
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.
SRS
3
3
D_C / NC
I
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.
4
5
4
5
ModOUT
REF
O
O
Power down control pin. Pull XIN/CLKIN and PD# LOW
to enable Power-Down mode. This pin has an internal
pull-up resistor.
6
7
6
7
8
PD#
VDD
I
P
O
Power Supply for the entire chip.
Crystal Connection. Input connection for an external
crystal. If using an external reference, this pin must be
left unconnected.
8
XOUT
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
SRS
D_C
Spread Deviation
0
1
-1.25% (DOWN)
-1.75% (DOWN)
-1.75% (DOWN)
±0.875% (CENTER)
P1819B
P1819G
NA
0
1
NA
Absolute Maximum Ratings
Symbol
Parameter
Rating
-0.5 to +4.6
-65 to +125
260
Unit
VDD, VIN
TSTG
Ts
Voltage on any pin with respect to Ground
Storage temperature
V
°C
°C
°C
Max. Soldering Temperature (10 sec)
Junction Temperature
TJ
150
Static Discharge Voltage
TDV
2
KV
(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
TA
Parameter
Min
3.0
Max
3.6
+85
15
Unit
V
Supply Voltage
Operating temperature
Load Capacitance
Input Capacitance
-40
°C
CL
pF
pF
CIN
7
Rev.3 | Page 3 of 6 | www.onsemi.com
P1819
DC Electrical Characteristics
Symbol
Parameter
Min
VSS–0.3
2.0
Typ
Max
Unit
V
VIL
VIH
IIL
Input Low voltage
Input High voltage
0.8
VDD+0.3
-20.0
1.0
V
Input Low current (inputs D_C, PD#, SRS)
Input High current
-60.0
µA
µA
mA
mA
V
IIH
IXOL
IXOH
VOL
VOH
XOUT Output low current @ 0.4V, VDD = 3.3V
XOUT Output high current @ 2.5V, VDD = 3.3V
Output Low voltage VDD = 3.3V, IOL = 20mA
Output High voltage VDD = 3.3V, IOH = 20mA
2.0
12.0
12.0
0.4
2.5
-
V
Dynamic supply current normal mode
3.3V and 25pF probe loading
7.1
fIN - min
26.9
fIN - max
ICC
IDD
mA
mA
V
Static supply current standby mode
Operating Voltage
4.5
3.3
VDD
tON
3.0
3.6
Power up time (first locked clock cycle after power up)
Clock Output impedance
0.18
50
mS
ꢀ
ZOUT
AC Electrical Characteristics
Symbol
Parameter
Min
20
Typ
Max
40
Unit
MHz
MHz
nS
fIN
Input Frequency
Output Frequency
fOUT
20
40
1
tLH
Output Rise time(Measured from 0.8V to 2.0V)
Output Fall time (Measured from 2.0V to 0.8V)
Jitter (cycle-to-cycle)
0.66
0.65
1
tHL
nS
tJC
tLTJ
tD
-200
45
200
55
pS
Long Term Jitter,(1000 cycle) on Refout @ 27MHz
Output Duty cycle
475
50
pS
%
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
Rev.3 | Page 4 of 6 | www.onsemi.com
P1819
Package Information
8-Pin SOIC Package
H
E
D
A2
A
C
θ
e
A1
L
B
Dimensions
Symbol
Inches
Millimeters
Min
Max
0.010
0.069
0.059
0.020
0.010
Min
0.10
1.35
1.25
0.31
0.18
Max
0.25
1.75
1.50
0.51
0.25
A1
A
0.004
0.053
0.049
0.012
0.007
A2
B
C
D
E
0.193 BSC
0.154 BSC
0.050 BSC
0.236 BSC
4.90 BSC
3.91 BSC
1.27 BSC
6.00 BSC
e
H
L
0.016
0°
0.050
8°
0.41
0°
1.27
8°
θ
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
P1819BF-08SR
P1819GF-08SR
Marking
ABY
Package Type
8-pin SOIC, tape & reel, Pb Free
8-pin SOIC, tape & reel, Pb Free
Temperature
0°C to +70°C
0°C to +70°C
ACA
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
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Rev.3 | Page 6 of 6 | www.onsemi.com
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