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參數(shù)資料
| 型號(hào)： | M926-02-622.0800 |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 622.08 MHz, OTHER CLOCK GENERATOR, CQCC36 |
| 封裝： | 9 X 9 MM, CERAMIC, LCC-36 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 321K |
| 代理商： | M926-02-622.0800 |
M926-02 Datasheet Rev 0.7
4 of 8
Revised 30Jul2004
I n teg r at ed Circuit Systems , Inc. ● Netw o r ki ng & C o mmun ica t io ns ● ww w. icst.com ● te l (5 08 ) 8 5 2 - 54 00
M926-02
VCSO BASED CLOCK GENERATOR
Preliminar y In f o r m atio n
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 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 M926-02 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 M926-02 requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 5).
Figure 5: External Loop Filter
The loop filter is implemented as a differential circuit
to minimize system noise interference. Due to the
differential signal path design, the implementation
requires two identical complementary RC filters as
shown here. See Table 4, Example External Loop Filter
Component Values, below.
additional product information.
PLL Simulator Tool Available
for additional 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
M926-02
Example External Loop Filter Component Values
PLL Bandwidth
(kHz)
Damping
Factor
R loop
(k
)
C loop
(
F)
R post
(k
)
C post
(pF)
0.395
2.0
1.5
4.70
20
3300
1.2
2.9
4.7
1.00
20
1000
10
1
Note 1: Recommended for minimum output jitter when
using a crystal or crystal oscillator reference.
2.4
39.0
0.01
20
240
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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