【应用笔记】使用Altera的高密度BGA封装器件进行设计(Designing With High-Density BGA Packages for Altera Devices) As programmable logic devices (PLDs) increase in density and I/O pins, the demand for small packages and diverse packaging options continues to grow. Ball-grid array (BGA) packages are an ideal solution because the I/O connections are on the interior of the device, improving the ratio between pin count and board area. Typical BGA packages contain up to twice as many connections as quad flat pack (QFP) packages for the same area. Further, BGA solder balls are considerably stronger than QFP leads, resulting in robust packages that can tolerate rough handling. Altera has developed high-density BGA solutions for users of high-density PLDs. These new formats require less than half the board space of standard BGA packages. Designing With High-Density BGA Packages for Altera Devices December 2007, ver. 5.1 Application Note 114 Introduction As programmable logic devices (PLDs) increase in density and I/O pins, the demand for small packages and diverse packaging options continues to grow. Ball-grid array (BGA) packages are an ideal solution because the I/O connections are on the interior of the device, improving the ratio between pin count and board area. Typical BGA packages contain up to twice as many connections a……