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參數(shù)資料
| 型號(hào)： | FS781 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Low EMI Spectrum Spread Clock |
| 中文描述： | 低EMI擴(kuò)頻時(shí)鐘頻譜 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 207K |
| 代理商： | FS781 |
FS781/82/84
Document #: 38-07029 Rev. *E
Page 2 of 12
Output Frequency Selection
Loop Filter Selection Chart
The following table provides a list of recommended loop filter
values for the FS781/82/84. The FS78X is divided into four
ranges and operated at both 3.3V and 5.5 VDC. The loop filter
at the right is representative of the loop filter components in
Table 2
.
Pin Description
Pin
Name
X
IN
/X
OUT
I/O
I/O
Type
Description
1/2 (SOIC)
3/4 (TSSOP)
Analog
Pins form an on-chip reference oscillator when connected to terminals
of an external parallel resonant crystal
. X
IN
may be connected to
TTL/CMOS external clock source. If X
IN
is connected to an external clock
other than crystal, leave X
OUT
(pin 2) unconnected.
Digital control inputs to select input frequency range and output
frequency scaling
. Refer to
Table 2
and
Table 3
for selection. S0 has internal
pull-down. S1 has internal pull-up.
Loop Filter
. Single ended three-state output of the phase detector. A two-pole
passive loop filter is connected to LF.
Modulated Clock Frequency Output
. The center frequency is the same as
the input reference frequency for FS781. Input frequency is multiplied by 2×
and 4× for FS782 and FS784, respectively.
Positive Power Supply
.
7/3 (SOIC)
1/5 (TSSOP)
S0 / S1
I
CMOS/TTL
4 (SOIC)
6 (TSSOP)
6 (SOIC)
8 (TSSOP)
LF
I
Analog
FSOUT
O
CMOS/TTL
8 (SOIC)
2 (TSSOP)
5 (SOIC)
7 (TSSOP)
V
DD
P
Power
V
SS
P
Power
Power Supply Ground
.
Table 1. FSOUT SSCG (Modulated Output Clock) Product Selection
Product Number
FS781
FS782
FS784
FSOUT Frequency Scaling
1×
2×
4×
Description
1× modulated frequency of input clock
2× modulated frequency of input clock
4× modulated frequency of input clock
Block Diagram
Pin Configuration
Phase
Detector
VCO
1(3)
2(4)
Xin
Xout
10 pF.
Reference
Divider
8 pF
8 pF
250 K
VCO / N
Modulation
Control
Input Control Logic
Output
Divider
and
Mux
Power Contol
Logic
3(5)
S1
7(1)
S0
8(2)
5(7)
4(6)
VDD
FSOUT
Loop Filter
VSS
6(8)
VSS
VDD
(TSSOP Pin #)
1
2
3
4
8
7
6
5
Xin
Xout
S1
LF
VDD
S0
FSOUT
VSS
FS78x
8 Pin SOIC Package
1
2
3
4
8
7
6
5
S0
VDD
Xin
Xout
FSOUT
VSS
LF
S1
FS78x
8 Pin TSSOP Package
LF (pin 4)
C8
R6
C7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FS782 | Low EMI Spectrum Spread Clock |
| FS784 | Low EMI Spectrum Spread Clock |
| FS7KM-12 | AML BUTTON/LENS RECTANG PB BLACK |
| FS7KM-12 | AML BUTTON/LENS RECTANG PB RED |
| FS7KM-14A | AML ROCKER OPERATOR COVER RED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FS781/82/84 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Clocks and Buffers |
| FS781BT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC |
| FS781BZB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC |
| FS782 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Low EMI Spectrum Spread Clock |
| FS782BT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MISCELLANEOUS CLOCK GENERATOR|TSSOP|8PIN|PLASTIC |
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