电子电路大全(PDF格式)-第94部分
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4。3 全球定位系统GPS 接收机射频芯片MAX2740 的原理与应用电路设计······························· （279 ）
4。3。1 概述······························································································································· （279 ）
4。3。2 主要技术指标················································································································ （279 ）
4。3。3 芯片封装与引脚功能···································································································· （280 ）
4。3。4 内部结构与工作原理···································································································· （281 ）
4。3。5 应用电路设计················································································································ （282 ）
4。4 数字卫星接收机（DBS ）变频调谐器芯片MAX2102/MAX2105 的原理与应用电路设计··· （286 ）
4。4。1 概述······························································································································· （286 ）
4。4。2 主要性能指标················································································································ （286 ）
4。4。3 芯片封装与引脚功能···································································································· （286 ）
4。4。4 内部结构与工作原理···································································································· （287 ）
4。4。5 应用电路设计················································································································ （287 ）
4。5 WCDMA 与GSM900 双频双模手机射频单元········································································· （294 ）
4。5。1 概述······························································································································· （294 ）
4。5。2 WCDMA/GSM 双频双模手机射频单元参考设计方案的关键芯片····························· （295 ）
4。5。3 WCDMA/GSM 双频双模手机射频单元参考设计方案················································ （300 ）
4。6 无线USB 接口芯片CY694X 的原理与应用电路设计······································································ （302 ）
4。6。1 概述······························································································································· （302 ）
4。6。2 CY694X 系列芯片内部结构························································································· （302 ）
4。6。3 采用CY6941 的无线USB 光鼠标电路······································································· （302 ）
4。6。4 采用CY6942 的无线USB 键盘电路············································································ （303 ）
4。6。5 采用CY6943 和CY7C63723 的USB 连接器······························································ （303 ）
参考文献····················································································································· （304 ）
·VI ·
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第 1 章 射频发射器芯片原理与
应用电路设计
1。1 315 MHz ASK/FSK 发射器芯片TDA5101
的原理与应用电路设计
1。1。1 概述
单片 ASK/FSK 发射器芯片 TDA5101 的工作频段为 314MHz～316 MHz，芯片内集成了
PLL 频率合成器、VCO 、高效的功率放大器和ASK/FSK 调制电路，电源电压为 2。1 V～4 V ，
工作电流小于 7 mA，提供低功耗模式，可为微控制器提供时钟。该芯片可用于无钥匙进入
系统、遥控系统、通信和安防系统等。
1。1。2 主要性能指标
TDA5101 的主要性能指标如表 1。1。1 所示。
表1。1。1 TDA5101 的主要性能指标
参 数 最 小 值 典 型 值 最 大 值 单 位
频率 314 315 316 MHz
输出功率 PPAOUT （f =315 MHz ） 3 5 7 dBm
待机模式 100 nA
电流消耗 PLL 使能 3。3 4。2 mA
发射使能 7 9 mA
待机模式 0 0。7 V
功率下降模式开关（V ） PLL 使能 1。5V V
PDWN s
发射使能 1。5V V
s
ASK 发射不使能 0 0。5 V
ASK 调制（V ） ASK 发射使能 1。5V V
ASKDTA s
ASK 数据速率 20 kHz
FSK 开关导通 0。5 V
FSK 调制（V ） FSK 开关断开 1。5V V
FSKDTA s
FSK 数据速率 20 kHz
时钟驱动器输出 电流（ICLKOUT ） 1 mA
…………………………………………………………Page 673……………………………………………………………
·2 · 射频集成电路芯片原理与应用电路设计
续表
参 数 最 小 值 典 型 值 最 大 值 单 位
f =f CRSTL/2 或 f =f CRSTL/8
0 0。2 V
缓冲的时钟输出
时钟驱动器控制（V ）
CLKDIV
f =f CRSTL/4 或 f =f CRSTL/16
