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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

Product Details

Key Features

Applications/Uses

Parametric specs for RF and IF Variable Gain Amplifiers
Gain Control Analog + Digital
# Channels 1
2
RF Freq. (MHz) (min) 10
RF Freq. (MHz) (max) 500
Analog Attenuation Range 44.7
Digital Attenuation Range (dB) 44.7
Gain (dB) (max) -3
Input IP3 (dBm) 34.4
HD2 (dBc) -63
HD3 (dBc) -97
VCC (V) 3.15 to 3.45
4.75 to 5.25
ISUPPLY (mA) 13
Footprint (mm x mm) 6.0 x 6.0
Package/Pins TQFN/36
Oper. Temp. (°C) -40 to +100
Budgetary
Price (See Notes)
5.95
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Simplified Block Diagram

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Parameters

Parametric specs for RF and IF Variable Gain Amplifiers
Gain Control Analog + Digital
# Channels 1
2
RF Freq. (MHz) (min) 10
RF Freq. (MHz) (max) 500
Analog Attenuation Range 44.7
Digital Attenuation Range (dB) 44.7
Gain (dB) (max) -3
Input IP3 (dBm) 34.4
HD2 (dBc) -63
HD3 (dBc) -97
VCC (V) 3.15 to 3.45
4.75 to 5.25
ISUPPLY (mA) 13
Footprint (mm x mm) 6.0 x 6.0
Package/Pins TQFN/36
Oper. Temp. (°C) -40 to +100
Budgetary
Price (See Notes)
5.95

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

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

Description

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.

Simplified Block Diagram

MAX19794: Typical Application Circuit MAX19794: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .