ADL5331 1 MHz to 1.2 GHz VGA with 30 dB Gain Control Range

The 50 Ω differential input system converts the applied differential voltage at INHI and INLO to a pair of differential currents with high linearity and good common-mode rejection. The signal currents are then applied to a proprietary voltage controlled attenuator providing precise definition of the overall gain under the control of the linear-in-dB interface. The GAIN pin accepts a voltage from 0 V at a minimum gain to 1.4 V at a full gain with a 40 mV/dB scaling factor over most of the range. The output of the high accuracy wideband attenuator is applied to a differential transimpedance output stage. The output stage provides a differential output at OPHI and OPLO, which must be pulled up to the supply with RF chokes or a center-tapped balun. The ADL5331 consumes 240 mA of current including the output pins and operates off a single supply ranging from 4.75 V to 5.25 V. A power-down function is provided by applying a logic low input on the ENBL pin. The current consumption in power-down mode is 250 μA. The ADL5331 is fabricated on an Analog Devices, Inc., proprietary high performance, complementary bipolar IC process. The ADL5331 is available in a 24-lead (4 mm × 4 mm), Pb-free LFCSP_VQ package and is specified for operation from ambient temperatures of −40°C to +85°C. An evaluation board is also available. Applications Transmit and receive power control at RF and IF CATV distribution

The ADL5331 is a high performance, voltage-controlled variable gain amplifier/attenuator for use in applications with frequencies up to 1.2 GHz. The balanced structure of the signal path maximizes signal swing, eliminates common-mode noise and minimizes distortion while it also reduces the risk of spurious feed-forward at low gains and high frequencies caused by parasitic coupling.

The 50 Ω differential input system converts the applied differential voltage at INHI and INLO to a pair of differential currents with high linearity and good common-mode rejection. The signal currents are then applied to a proprietary voltage controlled attenuator providing precise definition of the overall gain under the control of the linear-in-dB interface. The GAIN pin accepts a voltage from 0 V at a minimum gain to 1.4 V at a full gain with a 40 mV/dB scaling factor over most of the range.

The output of the high accuracy wideband attenuator is applied to a differential transimpedance output stage. The output stage provides a differential output at OPHI and OPLO, which must be pulled up to the supply with RF chokes or a center-tapped balun.

The ADL5331 consumes 240 mA of current including the output pins and operates off a single supply ranging from 4.75 V to 5.25 V. A power-down function is provided by applying a logic low input on the ENBL pin. The current consumption in power-down mode is 250 μA.

The ADL5331 is fabricated on an Analog Devices, Inc., proprietary high performance, complementary bipolar IC process. The ADL5331 is available in a 24-lead (4 mm × 4 mm), Pb-free LFCSP_VQ package and is specified for operation from ambient temperatures of −40°C to +85°C. An evaluation board is also available.

Applications

Features and Benefits
  • Voltage-controlled amplifier/attenuator
  • Operating frequency: 1 MHz to 1.2 GHz
  • Optimized for controlling output power
  • High linearity: OIP3 47 dBm @ 100 MHz
  • Output noise floor: −149 dBm/Hz @ maximum gain
  • Input impedance: 50 Ω
  • Output impedance: 20 Ω
  • Wide gain-control range: 30 dB
  • Linear-in-dB gain control function: 40 mV/dB
  • Single-supply voltage: 4.75 V to 5.25 V
  • RF & Microwave
    Data Sheets
    Documentnote
    ADL5331: 1 MHz to 1.2 GHz VGA with 30 dB Gain Control Range Data Sheet (Rev. 0)PDF 695 kB
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    ADL5331ACPZ-R7 Production24 ld LFCSP (4x4mm w/2.30mm EP)REEL 1500-40 to 85C05.16Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    ADL5331-EVALZEvaluation Board99Y
    Reference Materials
    ADL5331: 1 MHz to 1.2 GHz VGA with 30 dB Gain Control Range Data Sheet (Rev 0, 05/2009) ADL5331
    ADL5331: 1 MHz to 1.2 GHz VGA with 30 dB Gain Control Range Data Sheet (Rev. 0) adl5331
    RF Source Booklet adf9010
    CN-0082: Creating a Constant Envelope Signal Using the ADL5331 RFVGA and AD8319 ad8319