參數資料
| 型號： | ACS8944T |
| 廠商： | Semtech |
| 文件頁數： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC JITTER ATT MULT PLL 48-QFN |
| 標準包裝： | 1 |
| 類型： | 時鐘/頻率發(fā)生器，多路復用器 |
| PLL： | 是 |
| 主要目的： | SONET/SDH |
| 輸入： | LVPECL |
| 輸出： | LVPECL |
| 電路數： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 155.52MHz |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 48-QFN（7x7） |
| 包裝： | 管件 |
ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 20
www.semtech.com
ACS8944 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.
The device includes a large thermal die paddle which
must be soldered to the PCB in addition to the pins for
improved thermal dissipation characteristics and to
strengthen the mechanical connection to the PCB.
Although not essential for the ACS8944, 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 0.33mm diameter.
These vias should be completely connected (flooded over)
to the thermal landing(s) as well as to internal ground
planes if using a multilayer PCB. 3 x 3 vias pitched at 1.27
mm between via centres would be more than sufficient for
the ACS8944 if this method were adopted.
Figure 16 Typical 48 Pin QFN PCB Footprint
相關PDF資料 |
PDF描述 |
|---|---|
| ACS8946T | IC JITTER ATT MULT PLL 48-QFN |
| ACS8947T | IC JITTER ATT MULT PLL 48-QFN |
| AD10200BZ | IC ADC DUAL 12BIT 68-CLCC |
| AD10242BZ | IC ADC DUAL 12BIT 68-CLCC |
| AD10465BZ | IC ADC DUAL 14BIT 68-CLCC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ACS8946 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for OC-12/STM-4 and GbE |
| ACS8946EVB | 制造商:SEMTECH 制造商全稱: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 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:1,500 系列:- 類型:時鐘緩沖器/驅動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數:- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| ACS8947T | 功能描述:IC JITTER ATT MULT PLL 48-QFN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 專用 系列:- 標準包裝:1,500 系列:- 類型:時鐘緩沖器/驅動器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數:- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| ACS9010 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
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