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參數(shù)資料
| 型號： | M906-01-187.5000LF |
| 元件分類： | 時鐘產生/分配 |
| 英文描述： | 187.5 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| 封裝： | 9 X 9 MM, LEAD FREE, CERAMIC, LCC-36 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 352K |
| 代理商： | M906-01-187.5000LF |
M906-01 Datasheet Rev 3.2
4 of 8
Revised 15Jun2006
M906-01
VCSO BASED GBE CLOCK GENERATOR
Prod uct Data Sh eet
APPLICATION INFORMATION
This section includes information on the optional
external crystal and on the external loop filter.
External Crystal Specifications
If an external crystal is used with the on-chip crystal
oscillator circuit (XTAL OSC), the external crystal
should have the following general specifications:
The external crystal will be applied to the XTAL_1 / REF_IN
and XTAL_2 input pins. External crystal load capacitors
are also required.
Recommended External Crystal Configuration
XTAL= 25 or 30 MHz, Load Capacitance Specification = 18 pF
C1 = 27 pF
C2 = 33 pF
External load capacitors C1 and C2 present a load of 15 pf
to the crystal (they are seen in series by the crystal through
the common ground connection). With the additional of PCB
trace capacitance and M906-01 input capacitance, the total
load to the crystal is about 18 pf.
External Loop Filter
To provide stable PLL operation, and thereby a low jitter
output clock, the M906-01 requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 5).
Due to the differential signal path design, the
implementation requires two identical complementary
RC filters as shown here.
Figure 5: External Clock Feed-through
additional product information.
Crystal Specifications
Parameter
Min Typ Max Unit
Crystal Type
AT-cut quartz
Mode of Oscillation
Fundamental
f0
Frequency Range
16
40
MHz
ESR
Equivalent Series Resistance
50
Spurious Response (non-harmonic)
-40 dBc
C
L
Load Capacitance,
parallel load resonant
16
32
pF
P0
Drive Level
0.1
1.0
mW
Table 3: Crystal Specifications
XTAL_2
XTAL
XTAL OSC
M9xx-0x
XTAL_1 / REF_IN
C1
C2
M906-01
Example External Loop Filter Component Values
PLL Band-
width (kHz)
Damping
Factor
R loop
(k
)
C loop
(
F)
R post
(k
)
C
post
(pF)
0.5
3.0
1.5
4.70
20
1500
1.5 1
Note 1: Optimum loop bandwidth when using an external reference
crystal. Will help to attenuate interference on the crystal’s
sinusoidal clock waveform and therefore will minimize device
output clock jitter.
3.3
4.7
1.00
10
1500
2.1 2
Note 2: Alternative loop filter setting when using an external reference
crystal. Smaller C loop lowers loop damping factor with negli-
gible increase in output jitter.
1.1
4.7
0.10
10
1500
6.4
4.5
20.0
0.10
20
270
10.6 3
Note 3: Optimum loop bandwidth when using an external reference
crystal oscillator. The square wave clock reference does not
require as much jitter attenuation, which allows for a wider
loop bandwidth and improved system noise tolerance.
4.2
33.0
0.033
20
120
C
POST
C
POST
VC
nVC
R
POST
nOP_OUT
OP_OUT
R
POST
R
LOOP
R
LOOP
C
LOOP
C
LOOP
OP_IN
nOP_IN
相關PDF資料 |
PDF描述 |
|---|---|
| M906-01I156.2500 | 156.25 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| M906-01I125.0000 | 125 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| M906-01-125.0000 | 125 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| M906-01I187.5000 | 187.5 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| M906-01I156.2500LF | 156.25 MHz, OTHER CLOCK GENERATOR, CQCC36 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M906-01I156.2500 | 功能描述:時鐘發(fā)生器及支持產品 SAW CLOCK GENERATOR RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| M906-01I156.2500T | 制造商:Integrated Device Technology Inc 功能描述:SAW CLOCK GENERATOR 制造商:Integrated Device Technology Inc 功能描述:9X9 LCC(LEAD FREE) - Tape and Reel |
| M906-01I187.5000 | 制造商:ICS 制造商全稱:ICS 功能描述:VCSO BASED GBE CLOCK GENERATOR |
| M90-6020845 | 制造商:Harwin 功能描述: |
| M90-604 | 制造商:HARWIN 制造商全稱:Harwin Plc 功能描述:SPRING PROBE ASSEMBLY LONG TAIL |
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