General Description

The MAX2065 high-linearity, analog/digital variable gain amplifier (VGA) is designed to operate in the 50MHz to 1000MHz frequency range with two independent attenuators (see the Typical Application Circuit). The digital attenuator is controlled as a slave peripheral using either the SPI™-compatible interface or a parallel bus with 31dB total adjustment range in 1dB steps. An added feature allows “rapid-fire” gain selection between each of four steps, preprogrammed by the user through the SPI-compatible interface. The 2-pin control allows the user to quickly access any one of four customized attenuation states without reprogramming the SPI bus. The analog attenuator is controlled using an external voltage or through the SPI-compatible interface using an on-chip 8-bit DAC.

Features

♦ 50MHz to 1000MHz RF Frequency Range

♦ Pin-Compatible Family Includes:

    MAX2066 (Digital VGA)

    MAX2067 (Analog VGA)

♦ +19.4dB (Typ) Maximum Gain

♦ 0.5dB Gain Flatness Over 100MHz Bandwidth

♦ 62dB Gain Range (31dB Analog + 31dB Digital)

♦ Built-in DAC for Analog Attenuation Control

♦ Supports Four “Rapid-Fire” Preprogrammed Attenuator States

    Quickly Access Any One of Four Customized Attenuation States Without Reprogramming the SPI Bus

    Ideal for Fast-Attack, High-Level Blocker Protection

    Prevents ADC Overdrive Condition

♦ Excellent Linearity (Configured with Amplifier Last)

    +42dBm OIP3

    +63dBm OIP2

    +19dBm Output 1dB Compression Point

    -67dBc HD2

    -83dBc HD3

♦ 6.5dB Typical Noise Figure (NF)

♦ Fast, 25ns Digital Switching

♦ Very Low Digital VGA Amplitude Overshoot/ Undershoot

♦ Single +5V Supply (Optional +3.3V Operation)

♦ External Current-Setting Resistors Provide Option for Operating Device in Reduced-Power/Reduced-Performance Mode

Applications

    IF and RF Gain Stages

    Temperature Compensation Circuits

    Cellular Band WCDMA and cdma2000® Base Stations

    GSM 850/GSM 900 EDGE Base Stations

    WiMAX and LTE Base Stations and Customer Premise Equipment

    Fixed Broadband Wireless Access

    Wireless Local Loop

    Military Systems

    Video-on-Demand (VOD) and DOCSIS®- Compliant EDGE QAM Modulation

    Cable Modem Termination Systems (CMTS)