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MAX19794：10MHz to 500MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC

High-Performance RF VVA Features 46dB of Linearly Controlled Dynamic Range and Excellent Attenuation Flatness

The MAX19794 dual general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50Ω 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 x 6mm x 0.8mm) with an exposed pad. Electrical performance is guaranteed over the -40°C to +100°C extended temperature range.

Key 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

MAX19794: Typical Application Circuit Applications/Uses Automatic Level Control (ALC) Broadband System Applications, Including Wireless Infrastructure Digital and Spread-Spectrum Communication Systems General Test Equipment Lineup Gain Trim Microwave Point to Point Systems Receiver Gain Control Temperature Compensation Circuits Transmitter Gain Control VSAT/Satellite Modems WCDMA/LTE, TD-SCDMA/TD-LTE, WiMAX®, cdma2000®, GSM/EDGE and MMDS Base Stations

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Related Products

• MAX19791：50MHz to 4000MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC
• MAX19793：1500MHz to 6000MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC
• MAX19792：500MHz to 4000MHz Dual Analog Voltage Variable Attenuator with On-Chip 10-Bit SPI-Controlled DAC
• MAX19790：250MHz to 4000MHz Dual, Analog Voltage Variable Attenuator

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