参数资料
| 型号： | SM802121UMG TR |
| 厂商： | Micrel Inc |
| 文件页数： | 4/10页 |
| 文件大小： | 0K |
| 描述： | IC FREQ SYNTH 156.25MHZ 24QFN |
| 标准包装： | 1,000 |
| 系列： | ClockWorks™, RotaryWave™ |
| 类型： | * |
| PLL： | 是 |
| 输入： | CMOS，晶体 |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 2:1 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 156.25MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.375 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（4x4） |
| 包装： | 带卷 (TR) |
Micrel, Inc.
SM802121
January 2012
3
M9999-011212-A
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number
Pin Name
Pin Type
Pin Level
Pin Function
16, 17
/Q, Q
O, (DIF)
LVPECL
Differential Clock Output 156.25MHz.
1, 18
VDDO
PWR
Power Supply for Output.
2, 22
VSSO
PWR
Power Supply Ground for Output.
6
XTAL_SEL
I, (SE)
LVCMOS
Selects PLL Input Reference Source (0 = REF_IN, 1 =
XTAL, 45K pull-up).
3, 4, 20, 21,
23, 24
NC
No Connect. Do not connect anything to these pins.
5, 7, 12, 15, 19
TEST
Factory Test Pins. Do not connect anything to these pins.
8
VDD
PWR
Core Power Supply.
13, 14
VSS
(Exposed Pad)
PWR
Core Power Supply Ground. The exposed pad must be
connected to the VSS ground plane.
9
REF_IN
I, (SE)
LVCMOS
Reference Clock Input.
10
XIN
I, (SE)
crystal
Crystal Reference Input. No load caps needed. (See Fig. 5)
11
XOUT
O, (SE)
crystal
Crystal Reference Output. No load caps needed. (See Fig. 5)
Application Information
Input Reference
When operating with a crystal input reference, do not
apply a switching signal to REF_IN.
Crystal Layout
Keep the layers under the crystal as open as possible
and do not place switching signals or noisy supplies
under the crystal.
Crystal load capacitance is built inside the die so no
external capacitance is needed. See the Selecting a
quartz crystal for the Clockworks Flex I Family of
Precision Synthesizers
application note for further
details.
Contact Micrel’s HBW applications group if you need
assistance on selecting a suitable crystal for your
application at hbwhelp@micrel.com
Truth Table
XTAL_SEL
INPUT
0
REF_IN
1
XTAL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SM802122UMG | 功能描述:时钟合成器/抖动清除器 8 LVDS at 312.5 MHz Clock 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 |
| SM802122UMG TR | 功能描述:时钟合成器/抖动清除器 8 LVDS at 312.5 MHz Clock 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 |
| SM802123 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:ClockWorks? 125MHz/25MHz Ultra-Low Jitter, LVCMOS Frequency Synthesizer |
| SM802123UMG | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:ClockWorks? 125MHz/25MHz Ultra-Low Jitter, LVCMOS Frequency Synthesizer |
| SM802123UMGTR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:ClockWorks? 125MHz/25MHz Ultra-Low Jitter, LVCMOS Frequency Synthesizer |
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