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參數(shù)資料
| 型號： | M906-01I156.2500LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 156.25 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?。?/td> | 352K |
| 代理商： | M906-01I156.2500LF |
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
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| M90-6040845 | 功能描述:集管和線殼 IP68 HotShoe Conn 8P, 4MM TAIL, FEMALE RoHS:否 產(chǎn)品種類:1.0MM Rectangular Connectors 產(chǎn)品類型:Headers - Pin Strip 系列:DF50 觸點類型:Pin (Male) 節(jié)距:1 mm 位置/觸點數(shù)量:16 排數(shù):1 安裝風(fēng)格:SMD/SMT 安裝角:Right 端接類型:Solder 外殼材料:Liquid Crystal Polymer (LCP) 觸點材料:Brass 觸點電鍍:Gold 制造商:Hirose Connector |
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