ONSEMI P1708C

P1708C
Notebook LCD Panel EMI
Reduction IC
Features
Product Description
• FCC approved method of EMI attenuation.
• Generates a low EMI spread spectrum clock of the
input frequency.
• Optimized for frequency range from 50 to 110MHz.
• Internal loop filter minimizes external components and
board space.
• Four selectable spread ranges.
• Low inherent cycle-to-cycle jitter.
• 3.3V operating voltage range.
The P1708C is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies.
The P1708C reduces electromagnetic interference (EMI) at
the clock source, allowing system wide reduction of EMI of
down stream clock and data dependent signals. The
P1708C 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 P1708C 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.’
• TTL or CMOS compatible inputs and outputs.
• CMOS design.
o 8.46mA @ 3.3V, 54MHz
o 9.79mA @ 3.3V, 65MHz
o 12.06mA @ 3.3V, 81MHz
o 16.51mA @ 3.3V, 108MHz
• Supports notebook VGA and other LCD timing
controller applications.
The P1708C uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
• Pinout compatible to ICS MK1708 and Cypress
CY25560.
• SSON / SBM pin for Spread Spectrum On/Off and
Standby Mode controls.
Applications
• Available in 8-pin SOIC and TSSOP.
The P1708C is targeted towards notebook LCD displays,
and other displays using an LVDS interface, PC peripheral
devices, and embedded systems.
SR0 SR1 SSON
Block Diagram
VDD
PLL
Modulation
CLKIN
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
VCO
Output
Divider
ModOUT
©2010 SCILLC. All rights reserved.
FEBRUARY 2010 – Rev. 2
VSS
Publication Order Number:
P1708/D
P1708C
Pin Configuration
CLKIN 1
8 NC
VDD 2
7 SR0
P1708C
VSS
3
6 SR1
5 SSON/SBM
ModOUT 4
Pin Description
Pin#
Pin Name
Type
Description
1
CLKIN
I
Connect to externally generated clock signal. To put the part into standby mode,
disable the input clock signal to this pin and pull SSON / SBM (pin 5) low. Refer to
Standby Mode Selection Table.
2
VDD
P
Connect to +3.3V.
3
VSS
P
Ground Connection. Connect to system ground.
4
ModOUT
O
Spread spectrum clock output.
5
SSON / SBM
I
Spread Spectrum On/Off and standby mode control. Refer to Standby Mode
Selection Table. This pin has an internal pull-up resistor.
6
SR1
I
Digital logic input used to select Spreading Range. Refer to Spread Spectrum
Selection Table. This pin has an internal pull-up resistor.
7
SR0
I
Digital logic input used to select Spreading Range. Refer to Spread Spectrum
Selection Table. This pin has an internal pull-up resistor.
8
NC
-
No connect.
Standby Mode Selection
CLKIN
SSON / SBM
Spread
Spectrum
ModOUT
PLL
Mode
Disabled
0
N/A
Disabled
Disabled
Standby
Disabled
1
N/A
Disabled
Free Running
Free Running
Enabled
0
Off
Reference
Disabled
Buffer out
Enabled
1
On
Normal
Normal
Normal
Rev. 2 | Page 2 of 7 | www.onsemi.com
P1708C
Spread Range Selection
SR1
SR0
Spreading Range
Modulation Rate
0
0
±1.00%
(FIN/40) * 62.49KHz
0
1
±2.00%
(FIN/40) * 62.49KHz
1
0
±0.25%
(FIN/40) * 62.49KHz
1
1
±0.75%
(FIN/40) * 62.49KHz
Schematic for Notebook VGA Application
P1708C
NC
CLKIN
8
Pin 8 can be tied either high or low,
or it can be left unconnected.
2
VDD
SR0
7
3
VSS
SR1
6
Tie SR0 and SR1 high / low
according to spread range desired.
External resistors are not needed to
pull these pins high.
4
ModOUT
50MHz to 110MHz pixel clock input
from VGA chip.
1
0.1µF
FB
VDD
SSON 5
Pin 5 SSON should be left unconnected to turn on
spread spectrum. Pull this pin low to turn spread
spectrum OFF and enable stand-by mode.
50MHz to 110MHz Pixel Clock
Input from VGA Chip.
Note: To set the P1708C to standby mode, disable the input clock (pin 1 CLKIN) and pull SSON (pin 5) low. Refer to Standby Mode
Selection Table.
Absolute Maximum Ratings
Symbol
VDD, VIN
TSTG
Parameter
Rating
Unit
Voltage on any pin with respect to Ground
-0.5 to +7.0
V
Storage temperature
-65 to +125
°C
Ts
Max. Soldering Temperature (10 sec)
260
°C
TJ
Junction Temperature
150
°C
TDV
Static Discharge Voltage (As per JEDEC STD22- A114-B)
2
KV
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
Parameter
Min
Max
Unit
Supply Voltage
2.7
3.7
V
TA
Operating Temperature (Ambient Temperature)
-40
+85
°C
CL
Load Capacitance
15
pF
CIN
Input Capacitance
7
pF
VDD
Description
Rev. 2 | Page 3 of 7 | www.onsemi.com
P1708C
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VIL
Input low voltage
GND-0.3
0.8
V
VIH
Input high voltage
2.0
VDD+0.3
V
IIL
Input low current (pull-up resistors on inputs SR0, SR1 and
SSON/SBM)
-35
µA
IIH
Input high current
35
µA
IXOL
XOUT output low current @ 0.4V, VDD = 3.3V
3
mA
IXOH
XOUT output high current @ 2.5V, VDD = 3.3V
3
mA
VOL
Output low voltage VDD = 3.3V, IOL = 20mA
VOH
Output high voltage VDD = 3.3V, IOH = 20mA
ICC
Dynamic supply current normal mode
3.3V and 10pF loading
IDD
Static supply current standby mode
VDD
Operating voltage
tON
Power up time (first locked clock cycle after power up)
ZOUT
0.4
2.5
V
7.90
9.79
2.7
fIN
Parameter
17.53
fIN -max
0.6
Min
Typ
mA
mA
3.3
Clock output impedance
AC Electrical Characteristics
Symbol
V
3.7
V
0.18
mS
50
Ω
Max
Unit
Input frequency
50
110
MHz
fOUT
Output frequency
50
110
MHz
1
tLH
Output rise time
Measured at 0.8V to 2.0V
0.7
0.9
1.1
ns
tH
1
Output fall time
Measured at 0.8V to 2.0V
0.6
0.8
1.0
ns
tJC
Jitter (cycle-to-cycle)
360
ps
tD
Output duty cycle
55
%
45
Note: 1. tLH and tHL are measured into a capacitive load of 15pF.
Rev. 2 | Page 4 of 7 | www.onsemi.com
50
P1708C
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. 2 | Page 5 of 7 | www.onsemi.com
P1708C
8-Pin TSSOP
H
E
D
A2
A
θ
e
C
A1
L
B
Dimensions
Symbol
Inches
Min
Millimeters
Max
A
Min
Max
0.043
1.10
A1
0.002
0.006
0.05
0.15
A2
0.033
0.037
0.85
0.95
B
0.008
0.012
0.19
0.30
C
0.004
0.008
0.09
0.20
D
0.114
0.122
2.90
3.10
E
0.169
0.177
4.30
4.50
e
0.026 BSC
0.65 BSC
H
0.252 BSC
6.40 BSC
L
0.020
0.028
θ
0°
8°
0.50
0.70
0°
8°
Rev. 2 | Page 6 of 7 | www.onsemi.com
P1708C
Ordering Codes
Part number
Marking
Package Type
Temperature
P1708CF-08SR
AAY
8-Pin SOIC, Tape and Reel, Pb Free
0°C to +70°C
P1708CF-08TR
AAY
8-Pin TSSOP, Tape and 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
Licensed under US Patent #5,488,627 and #5,631,921
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003.
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