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参数资料
| 型号： | ACS8946 |
| 元件分类： | 数字传输电路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC48 |
| 封装： | 7 X 7 MM, QFN-48 |
| 文件页数： | 31/40页 |
| 文件大小： | 663K |
| 代理商： | ACS8946 |
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ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 37
www.semtech.com
ACS8946 JAM PLL
Thermal Conditions
The device is rated for full temperature range when this
package is used with a 4-layer or more PCB. Copper
coverage must exceed 50%. All pins must be soldered to
the PCB. Maximum operating temperature must be
reduced when the device is used with a PCB with less than
these requirements.
As the device includes a large thermal die paddle ground
connection which must be soldered to the PCB in addition
to the pins, giving improved pull-off strength and thermal
dissipation characteristics as well as the necessary
grounding.
Although not essential for the ACS8946, one technique
that may be used to improve heat dissipation from
through the large centre pad is to include a thermal
landing the same size as the centre pad on the
component side of the board (and one on the opposite
side of the PCB) connected to analog ground using a
number of thermal vias, approximately 0.33 mm
diameter. These vias should be completely connected
(flooded over) to the thermal landing(s) as well as to
internal ground planes if using a multi-layer PCB. 3 x 3
vias pitched at 1.27 mm between via centres would be
more than sufficient for the ACS8946 if this method were
adopted.
Figure 22 Typical 48 Pin QFN PCB Footprint
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ACS8946EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for OC-12/STM-4 and GbE |
| ACS8946T | 功能描述:IC JITTER ATT MULT PLL 48-QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ACS8947T | 功能描述:IC JITTER ATT MULT PLL 48-QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ACS9010 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| ACS9510/50EVB | 制造商:Semtech Corporation 功能描述: |
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