MAX2105中文资料直接变频调谐器IC，适合数字DBS应用数据手册ADI规格书

描述 Description

The MAX2102/MAX2105* are low-cost direct-conversion tuner ICs designed for use in digital direct-broadcast satellite (DBS) television set-top box units. The direct-conversion architecture reduces system cost compared to devices with IF-based architectures.
The MAX2102/MAX2105 directly tune L-band signals to baseband using a broadband I/Q downconverter. Operating frequency range spans from at least 950MHz to 2150MHz.
The ICs include a low-noise amplifier (LNA) with automatic gain control (AGC), two downconverter mixers, an oscillator buffer with 90° quadrature generator and prescaler, and baseband amplifiers.
The MAX2102 features an AGC range of 50dB, allowing input power levels as low as -69dBm. The MAX2105 has a reduced AGC range of 41dB and accepts input power levels down to -60dBm. The reduced AGC range of the MAX2105 allows the use of a high-gain external LNA to achieve a lower system noise figure (NF).

特性 Features

• Low-Cost Bipolar Design, Lowest Cost Architecture
• Operate from a Single +5V Supply
• 950MHz to 2150MHz Input Frequency Range*
• On-Chip Quadrature Generator, Dual-Modulus Prescaler (/64, /65)
• Input Levels
• 69dBm to -19dBm per Carrier (MAX2102)
• -60dBm to -19dBm per Carrier (MAX2105)
• Over 50dB AGC Control Range (MAX2102)
• Noise Figure = 13.2dB (MAX2102); IP3 = 6.5dBm (at 1450MHz)
• Automatic Baseband Offset Correction
• Easy Interface to MAX1002/MAX1003 Dual ADC and Popular Baseband ICs

应用 Application

• 宽带系统
• 蜂窝电话基站
• DBS调谐器
• DVB兼容的DBS调谐器
• LMDS
• 无线本地环路(WLL)