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ASM3P2812B Datasheet(PDF) 2 Page - ON Semiconductor

Part # ASM3P2812B
Description  Low Power EMI Reduction IC
Download  9 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ASM3P2812B Datasheet(HTML) 2 Page - ON Semiconductor

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ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B
http://onsemi.com
2
Figure 1. Block Diagram
VDD
PLL
VCO
VSS
ModOUT
Loop
Filter
Output
Divider
Crystal
Oscillator
XOUT
XIN / CLKIN
Phase
Detector
D_C SRS FRS
Modulation
Frequency
Divider
Feedback
Divider
Table 1. PIN DESCRIPTION
Pin#
Pin Name
Type
Description
1
XIN / CLKIN
I
Crystal connection or external Clock input.
2
VSS
P
Ground to entire chip.
3
D_C
I
Digital logic input used to select Down (LOW) or Center (HIGH) spread options.
(Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull−up resistor.
4
SRS
I
Spread range select. Digital logic input used to select frequency deviation
(Refer to Frequency Deviation and Spread Selection Table).
This pin has an internal pull−up resistor.
5
ModOUT
O
Spread spectrum clock output
6
FRS
I
Frequency range select. Digital logic input used to select Input frequency range
(Refer to Input/Output Frequency Range Selection Table).
This pin has an internal pull−up resistor.
7
VDD
P
Power supply for the entire chip.
8
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
Table 2. INPUT/OUTPUT FREQUENCY RANGE SELECTION
FRS (pin 6)
Part Number
Modulation Rate
ASM3P2811 (1x)
ASM3P2812 (2x)
ASM3P2814 (4x)
Input
(MHz)
Output
(MHz)
Input
(MHz)
Output
(MHz)
Input
(MHz)
Output
(MHz)
0
10−20
10−20
10−20
20−40
10−20
40−80
Input Frequency / 448
1
20−40
20−40
20−40
40−80
20−40
80−160
Input Frequency / 896


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