LT5546数据手册RF/IF射频/中频RFID的RF解调器规格书PDF

描述 Description

The LT®5546 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA) and 17MHz I/Q baseband bandwidth designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature downconverting mixers and 17MHz lowpass noise filters (LPF). The LO port consists of a divide-by-two stage and LO buffers. The IC provides all building blocks for IF down-conversion to I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The VGA gain has a linear-in-dB relationship to the control input voltage. Hard-clipping amplifiers at the mixer outputs reduce the recovery time from a signal overload condition. The lowpass filters reduce the out-of-band noise and spurious frequency components. The -3dB corner frequency of the noise filters is approximately 17MHz and has a first order rolloff.  The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip.

特性 Features

• 17MHz I/Q 低通输出噪声滤波器
• 1.8V 至 5.25V 的宽电源电压范围
• 频率范围：40MHz 至 500MHz
• THD P-P 差分输出电平)
• IF 过载检测器
• 对数线性增益控制范围：–7dB 至 56dB
• 基带 I/Q 幅度不平衡：0.2dB
• 基带 I/Q 相位不平衡：0.6°
• 7.8dB 噪声指数 (在最大增益)
• 输入 IP3 (在低增益)：–1dBm
• 低电源电流：24mA
• 在整个增益控制范围内具有低延迟移位：2ps/dB
• 在待用模式中输出偏压上升
• 具裸露衬垫的 16 引脚 4mm x 4mm QFN 封装

应用 Application

• GPS IF 接收机
• 卫星 IF 接收机
• VHF/UHF 接收机
• 无线本地环路

简介

LT5546属于RF/IF射频/中频RFID的RF解调器。由制造生产的LT5546RF 解调器RF 解调器是设计用于从调制波中提取信号的器件，调制波则是通过使用频率、幅度、相位、放大器或位移器而改变的波。