P2812B Datasheet PDF - ON Semiconductor

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P2812B
ON Semiconductor

Part Number P2812B
Description Low Power EMI Reduction IC
Page 6 Pages


P2812B datasheet pdf
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P2811A/B and P2812A/B and P2814A/B
Low Power EMI Reduction IC
Features
FCC approved method of EMI attenuation
Provides up to 15dB EMI reduction
Generates a 1x, 2x and 4x low EMI spread spectrum
clock of the input frequency
o 1x: P2811A/B
o 2x: P2812A/B
o 4x: P2814A/B
Optimized for input frequency range from 10MHz to
40MHz
Internal loop filter minimizes external components
and board space
Selectable spread options:
o Down Spread and Center Spread
8 frequency deviation selections:
o ±0.625% to -3.5%
Low inherent Cycle-to-Cycle Jitter
3.3V Operating Voltage
CMOS/TTL compatible inputs and outputs.
Pin-out compatible with Cypress CY25811, CY25812
and CY25814
Available in 8-pin SOIC Package
Product Description
The P28XX devices are versatile spread spectrum
frequency modulators designed specifically for a wide
range of input clock frequencies from 10MHz to 40MHz.
Refer to Input/output Frequency Range Selection Table.
The P28XX can generate an EMI reduced clock from
crystal, ceramic resonator, or system clock. The P28XX-A
and the P28XX-B offer various
combinations of spread options and percentage
deviations. Refer to Frequency Deviation and Spread
Selection Table. These combinations include Down and
Center Spread, and percentage deviation range from
±0.625% to -3.5%.
The P28XX reduces electromagnetic interference (EMI)
at the clock source, allowing system wide reduction of
EMI of downstream clock and data dependent signals.
The P28XX 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 P28XX 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 results 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 P28XX uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all-digital method.
Applications
The P28XX 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.
©2010 SCILLC. All rights reserved.
JUNE 2011 – Rev. 2
Publication Order Number:
P2811/D



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Block Diagram
XIN / CLKIN
XOUT
Crystal
Oscillator
P2811A/B and P2812A/B and P2814A/B
D_C SRS FRS
VDD
Frequency
Divider
Feedback
Divider
r
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
Pin Configuration
Pin Description
Pin# Pin Name
1 XIN / CLKIN
2 VSS
3 D_C
4 SRS
5 ModOUT
6 FRS
7 VDD
8 XOUT
VSS
XIN / CLKIN 1
VSS 2
D_C 3
SRS 4
P2811A/B
P2812A/B
P2814A/B
8 XOUT
7 VDD
6 FRS
5 ModOUT
Type
Description
I Crystal connection or external Clock input.
P Ground to entire chip.
Digital logic input used to select Down (LOW) or Center (HIGH) spread options.
I (Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull-up resistor.
Spread range select. Digital logic input used to select frequency deviation
I (Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull-up resistor.
O Spread spectrum clock output.
Frequency range select. Digital logic input used to select Input frequency range
I (Refer to Input/Output Frequency Range Selection Table).
This pin has an internal pull-up resistor.
P Power supply for the entire chip.
O
Crystal connection. If using an external reference, this pin must be left
unconnected.
.
Rev. 2 | Page 2 of 6 | www.onsemi.com



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P2811A/B and P2812A/B and P2814A/B
Input/Output Frequency Range Selection Table
Part Number
FRS (pin 6)
0
P2811 (1x)
Input Output
(MHz) (MHz)
10-20 10-20
P2812 (2x)
Input
(MHz)
Output
(MHz)
10-20
20-40
1
20-40 20-40
20-40
40-80
P2814 (4x)
Input
(MHz)
Output
(MHz)
10-20
40-80
Modulation Rate
Input Frequency / 448
20-40
80-160 Input Frequency / 896
Output Frequency Deviation and Spread Selection Table
Part Number
D_C
(pin 3)
SRS
(pin 4)
Frequency Deviation1 (%)
FS=0
FS=1
10/20/40 (MHz) 20/40/80 (MHz) 20/40/80 (MHz) 40/80/160 (MHz)
00
-3
-2.5 -2.7
-2.6
01
P28XXA
10
-3.7
±1.5
-3.4
±1.2
-3.8
±1.5
-3.6
±1.3
11
±1.8
±1.6
±1.9
±1.8
00
-1.7
-1.0
-1.5
-1.4
01
P28XXB
10
-2.0
±0.75
-1.5
±0.6
-2.0
±0.8
-1.9
±0.7
11
±1.0
±0.75
±1.0
Note: 1. Frequency Deviation given in the table is for the Output Frequency Range covering P2811x / 12x / 14x.
±0.9
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VDD, VIN Voltage on any pin with respect to Ground
-0.5 to +4.6
V
TSTG
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 STD 22- 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.
.
Rev. 2 | Page 3 of 6 | www.onsemi.com



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P2811A/B and P2812A/B and P2814A/B
Operating Conditions
Symbol
VDD Supply Voltage
TA Operating temperature
CL Load Capacitance
CIN Input Capacitance
Parameter
DC Electrical Characteristics
Symbol
Parameter
VIL Input low voltage
VIH Input high voltage
IIL
Input low current
(Inputs D_C, SRS and FRS are pulled high internally)
IIH Input high current
IXOL
XOUT Output low current
(VXOL@ 0.4V, VDD = 3.3V)
IXOH
XOUT Output high current
(VXOH@ 2.5V, VDD = 3.3V)
VOL Output low voltage (VDD = 3.3V, IOL = 15mA)
VOH Output high voltage (VDD = 3.3V, IOH = -15mA)
ICC
IDD
VDD
Dynamic supply current (Unloaded Output)
Static supply current , Standby mode
(CLKIN pulled to GND)
Operating voltage
tON
ZOUT
Power up time (first locked clock cycle after power up)
Clock out impedance
AC Electrical Characteristics
Symbol
Parameter
fIN Input frequency for P2811/12/13/14 A/B
Output frequency for P2811A/B
fOUT Output frequency for P2812A/B
Output frequency for P2814A/B
tLH1 Output rise time (measured at 0.8V to 2.0V)
tHL1 Output fall time (measured at 2.0V to 0.8V)
tJC Cycle-to-Cycle Jitter (Unloaded Output)
tD Output duty cycle
Note: 1. tLH and tHL are measured into a capacitive load of 15pF
Min
VSS – 0.3
2
2.5
8
3.0
Min
10
10
20
40
0.4
0.5
45
Min
Max
Unit
3.0 3.6 V
-40 +85 °C
15 pF
7 pF
Typ Max Unit
0.8 V
VDD + 0.3
V
-50 µA
50 µA
3 mA
3 mA
0.4 V
V
24 mA
4.5 mA
3.3 3.6 V
500 µS
26
Typ
0.5
0.6
±250
50
Max
40
40
80
160
0.7
0.8
55
Unit
MHz
MHz
MHz
MHz
nS
nS
pS
%
.
Rev. 2 | Page 4 of 6 | www.onsemi.com



P2812B datasheet pdf
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P2812A Low Power EMI Reduction IC P2812A
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P2812B pdf

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