Analog Devices MAX19791 Product Info

• Wideband Coverage
  • 50MHz to 4000MHz RF Frequency Range
• High Linearity
  • Greater Than +37.4dBm IIP3 Over the Full Attenuation Range
  • +22.6dBm Input P_1dB
• 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
  • 23dB (Per Attenuator)
  • 46dB (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-Compatible with the MAX19792 and MAX19793
• Pin-Compatible with the MAX19794 with Addition of Two Shunt Capacitors
• PCB-Compatible with the MAX19790
• Lead(Pb)-Free Package

The MAX19791 dual general-purpose analog voltage variable attenuator (VVA) is designed to interface with 50Ω systems operating in the 50MHz to 4000MHz frequency range. The device includes a patented control circuit that provides 23dB of attenuation range (per attenuator) with a typical linear control slope of 8dB/V.

Both attenuators share a common analog control and can be cascaded together to yield 46dB 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 reprogramming the SPI interface.

The MAX19791 is a monolithic device designed using one of Maxim's proprietary SiGe BiCMOS processes. The part operates from a single +5V supply or alternatively 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.

Applications

• 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