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參數(shù)資料
| 型號： | SY89430VZCTR |
| 廠商： | MICREL INC |
| 元件分類： | XO, clock |
| 英文描述： | 5V/3.3V PROGRAMMABLE FREQUENCY SYNTHESIZER (50MHz to 950MHz) |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 25 MHz, PDSO28 |
| 封裝： | 0.300 INCH, LEAD FREE, SOIC-28 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 139K |
| 代理商： | SY89430VZCTR |
4
ClockWorks
SY89430V
Micrel
The configuration logic has two sections: serial and
parallel. The parallel interface uses the values at the M[8:0]
and N[1:0] inputs to configure the internal counters.
Normally upon system reset, the P_
LOAD
input is held LOW
until sometime after power becomes valid. With S_
LOAD
held LOW, on the LOW-to-HIGH transition of P_
LOAD
, the
parallel inputs are captured. The parallel interface has
priority over the serial interface. Internal pull-up resistors
are provided on the M[8:0] and N[1:0] inputs to reduce
component count.
The serial interface logic is implemented with a 14-bit shift
register scheme. The register shifts once per rising edge of the
S_
CLOCK
input. The serial input S_
DATA
must meet set-up and
hold timing as specified in the AC parameters section of this
data sheet. With P_
LOAD
held HIGH, the configuration latches
will capture the value in the shift register on the HIGH-to-LOW
edge of the S_
LOAD
input. See the programming section for
more information.
The TEST output reflects various internal node values and
is controlled by the T[2:0] bits in the serial data stream. See
the programming section for more information.
FUNCTIONAL DESCRIPTION
WITH 16MHZ INPUT
The internal oscillator uses the external quartz crystal as
the basis of its frequency reference. The output of the reference
oscillator is divided by eight before being sent to the phase
detector. With a 16MHz crystal, this provides a reference
frequency of 2MHz.
The VCO within the PLL operates over a range of 400
–
950MHz. Its output is scaled by a divider that is configured by
either the serial or parallel interfaces. The output of this loop
divider is also applied to the phase detector.
The phase detector and loop filter force the VCO output
frequency to be M times the reference frequency by adjusting
the VCO control voltage. Note that for some values of M
(either too high or too low) the PLL will not achieve loop lock.
External loop filter components are utilized to allow for optimal
phase jitter performance.
The output of the VCO is also passed through an output
divider before being sent to the PECL output driver. The
output divider is configured through either the serial or the
parallel interfaces and can provide one of four divider ratios
(1, 2, 4 or 8). This divider extends the performance of the part
while providing a 50% duty cycle.
The output driver is driven differentially from the output
divider and is capable of driving a pair of transmission lines
terminated in 50
to V
CC
–
2volts. The positive reference for
the output driver is provided by a dedicated power pin
(V
CC_OUT
) to reduce noise induced jitter.
VCO Frequency
(MHz)
400
402
404
406
944
946
948
950
256
M8
0
0
0
0
1
1
1
1
128
M7
1
1
1
1
1
1
1
1
64
M6
1
1
1
1
1
1
1
1
32
M5
0
0
0
0
0
0
0
0
16
M4
0
0
0
0
1
1
1
1
8
4
2
1
M Count
200
201
202
203
472
473
474
475
M3
1
1
1
1
1
1
1
1
M2
0
0
0
0
0
0
0
0
M1
0
0
1
1
0
0
1
1
M0
0
1
0
1
0
1
0
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SY89430VZH | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 5V/3.3V Programmable Frequency Synthesizer (50-950MHz) (Green) RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SY89430VZH TR | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 5V/3.3V Programmable Frequency Synthesizer (50-950MHz) (Green) RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| SY89430VZHTR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:5V/3.3V PROGRAMMABLE FREQUENCY SYNTHESIZER (50MHz to 950MHz) |
| SY89464 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision LVPECL/LVDS Runt Pulse Eliminator 1:10 Fanout Buffer with 2:1 MUX |
| SY89464U | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision LVPECL 1:10 Fanout with 2:1 Runt |
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