آر اف (فرکانس رادیویی) و بی‌سیم تضعیف‌کننده‌

Product Attributes

Introduction

The MAX19794 dual general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50I systems operating in the 10MHz to 500MHz frequency range. This device includes a patented control circuit that provides 22.4dB of attenuation range (per attenuator) with a typical linear control slope of 8dB/V. Both attenuators share a common analog control. They can be cascaded together to yield 44.7dB of total attenuation range with a typical combined linear control slope of 16dB/V (5V operation). Alternatively, the on-chip, 4-wire SPI-controlled 10-bit DAC can be used to control both attenuators. In addition, a step-up/down feature allows user-programmable attenuator stepping through command pulses without re-programming the SPI interface. The MAX19794 is a monolithic device designed using one of Maxim’s proprietary SiGe BiCMOS processes. The part operates from a single +5V supply or alternatively operates from a single +3.3V supply. It is available in a compact 36-pin TQFN package (6mm × 6mm × 0.8mm) with an exposed pad. Electrical performance is guaranteed over the -40℃ to +100℃ extended temperature range.

Features

• Wide Band Coverage
• RF Frequency Range from 10MHz to 500MHz
• High Linearity: Greater than +34.4dBm IIP3 over the Full Attenuation Range, >+21.8dBm Input P1dB
• Integrates Two Analog Attenuators in One Monolithic Device
• Two Convenient Control Options: Single Analog Voltage, On-Chip, SPI-Controlled 10-Bit DAC
• Step-Up/Down Pulse Command Inputs
• Flexible Attenuation Control Ranges: 22.4dB (per Attenuator), 44.7dB (both Attenuators Cascaded)
• Linear dB/V Analog Control Response Curve Simplifies Automatic Leveling Control and Gain Trim Algorithms
• Excellent Attenuation Flatness over Wide Frequency Ranges and Attenuation Settings
• On-Chip Comparator (for Successive Approximation Measurement of Attenuator Control Voltage)
• Low 13mA Supply Current
• Single +5V or 3.3V Supply Voltage
• Pin Similar with MAX19791, MAX19792, and MAX19793
• Lead-Free Package

Applications

• Broadband System Applications
• Wireless Infrastructure Digital and Spread Spectrum Communication Systems
• WCDMA/LTE, TD-SCDMA/TD-LTE, WiMAX, cdma2000, GSM/EDGE and MMDS Base Stations
• VSAT/Satellite Modems
• Microwave Point to Point Systems
• Lineup Gain Trim
• Temperature Compensation Circuits
• Automatic Level Control (ALC)
• Transmitter Gain Control
• Receiver Gain Control
• General Test Equipment