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| 型号： | MPC92433AE |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESIZER LVPECL 48-LQFP |
| 标准包装： | 250 |
| 类型： | 时钟/频率合成器 |
| PLL： | 带旁路 |
| 输入： | LVCMOS，晶体 |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 3:2 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 1.428GHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 托盘 |
| 其它名称： | 800-2267 MPC92433AE-ND |
MPC92433 Data Sheet
1428MHZ DUAL OUTPUT LVPECL CLOCK SYNTHESIZER
MPC92433 REVISION 3 FEBRUARY 6, 2013
16
2013 Integrated Device Technology, Inc.
VCC_PLL Filter
The MPC92433 is a mixed analog/digital product. Its analog
circuitry is naturally susceptible to random noise, especially if this
noise is seen on the power supply pins. Random noise on the
VCC_PLL pin impacts the device AC characteristics. The
MPC92433 provides separate power supplies for the digital
circuitry (VCC) and the internal PLL (VCC_PLL) of the device.
The purpose of this design technique is to isolate the high
switching noise digital outputs from the relatively sensitive internal
analog phase-locked loop. In digital system environments where
it is more difficult to minimize noise on the power supplies a
second level of isolation is recommended: a power supply filter on
the VCC_PLL pin for the MPC92433.
Figure 7. VCC_PLL Power Supply Filter
Figure 7 illustrates a recommended power supply filter
scheme.
The MPC92433 is most susceptible to noise with spectral
content in the 100 kHz to 1 MHz range. Therefore, the filter should
be designed to target this range. The key parameter that needs to
be met in the final filter design is the DC voltage drop that will be
seen between the VCC supply and the VCC_PLL pin of the
MPC92433. From the data sheet, the VCC_PLL current (the current
sourced through the VCC_PLL pin) is maximum 10 mA, assuming
that a minimum of 2.985 V must be maintained on the VCC_PLL
pin. The resistor shown in Figure 7 must have a resistance of 10–
15
to meet the voltage drop criteria. The minimum values for RF
and the filter capacitor CF are defined by the filter characteristics:
the RC filter should provide an attenuation greater than 40 dB for
noise whose spectral content is above 100 kHz. In the
recommended filter shown in Figure 7 the filter cut-off frequency
is around 3.0–4.5 kHz and the noise attenuation at 100 kHz is
better than 42 dB.
As the noise frequency crosses the series resonant point of an
individual capacitor its overall impedance begins to look inductive
and thus increases with increasing frequency. The parallel
capacitor combination shown ensures that a low impedance path
to ground exists for frequencies well above the bandwidth of the
PLL.
The On-Chip Crystal Oscillator
The MPC92433 features an integrated on-chip crystal oscillator
to minimize system implementation cost. The integrated oscillator
is a Pierce-type that uses the crystal in its parallel resonance
mode. It is recommended to use a 15 to 20 MHz crystal with a load
specification of CL = 10 pF. Crystals with a load specification of
CL = 20 pF may be used at the expense of an resulting slightly
higher frequency than specified for the crystal. Externally
connected capacitors on both the XTAL_IN and XTAL_OUT pins
are not required but can be used to fine-tune the crystal frequency
as desired.
The crystal, the trace and optional capacitors should be placed
on the board as close as possible to the MPC92433 XTAL_IN and
XTAL_OUT pins to reduce crosstalk of active signals into the
oscillator. Short and wide traces further reduce parasitic
inductance and resistance. It is further recommended to guard the
crystal circuit by placing a ground ring around the traces and
oscillator components.
RF = 10–15
VCC
CF = 22 F
10 nF
33...100 nF
VCC_PLL
VCC
MPC92433
7
Table 22. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance Mode
Parallel
Crystal Frequency
16–20 MHz
Shunt Capacitance C0
5–7 pF
Load Capacitance CL
10 pF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC92433AER2 | 功能描述:时钟合成器/抖动清除器 FSL 1428MHz Dual Out put LVPECL Clock Syn RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC92439 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:900MHz, Low Voltage, LVPECL Clock Syntheesizer |
| MPC92439AC | 功能描述:IC SYNTHESIZER LVPECL 32-LQFP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| MPC92439ACR2 | 功能描述:IC SYNTHESIZER LVPECL 32-LQFP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| MPC92439EI | 功能描述:时钟合成器/抖动清除器 FSL 900MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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