Low Frequency to 3 GHz, Dual VGA with Output Common-Mode and DC Offset Control Data Sheet ADRF6521 FEATURES SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM VPOS VGN VNEG FLT1 OFS1 Dual, matched VGAs Maximum voltage gain: 18 dB INM1 + OPM1 Gain control attenuation range: 21 dB typical for T = 25C A 18dB 1 dB gain flatness bandwidth: 2.5 GHz typical INP1 + OPP1 IMD2 and IMD3 (1.5 V p-p output level) 56.8 dBc typical and 75 dBc typical, respectively, at VGN = 1.5 V, 980 MHz and 1000 MHz tones COMM ADRF6521 VOCM HD2 and HD3 (1.5 V p-p output level) 75 dBc typical and 73.7 dBc typical, respectively, at VGN = 1.5 V, fundamental at 500 MHz + INP2 OPP2 55.9 dBc typical and 57.5 dBc typical, respectively, at 18dB VGN = 1.5 V, fundamental at 1 GHz INM2 + OPM2 Noise figure 10.5 dB typical at maximum gain and at 500 MHz VPOS PWD VNEG FLT2 OFS2 14.8 dB at maximum gain and at 2 GHz Figure 1. Noise figure decreases dB for dB with gain backoff 100 differential input impedance 16 differential output impedance Programmable Output DC offset nominal range: 400 mV Output common-mode control: > 200 mV for VOCM = 0.2 V Single- or dual-supply operation with power-down feature Single supply: VPOS = 5 V, VNEG = 0 V (nominal) Dual supply: VPOS = 3 V, VNEG =2 V (nominal) APPLICATIONS Point-to-point and point-to-multipoint radios Baseband IQ receivers Diversity receivers ADC drivers Instrumentation Medical GENERAL DESCRIPTION The ADRF6521 is a dual, fully differential, low noise and low for second and third harmonic distortion (HD2 and HD3) from distortion variable gain amplifier (VGA). The high spurious- low frequency to 1 GHz. Variable output dc offset control is free dynamic range over the gain range makes the ADRF6521 accomplished with the OFS1 and OFS2 pins, and the output ideal for communication systems with dense constellations, common-mode can be controlled with the VOCM pin. multiple carriers, and nearby interferers. The ADRF6521 flexibly operates from a single +5 V supply or The VGA has a 21 dB attenuation range with a typical voltage from a range of dual supplies and consumes a total supply gain of 18 dB. The differential input impedance is 100 , while the current of 200 mA. When fully disabled, it consumes 25 mA differential output impedance is 16 . The 1 dB gain flatness typical. The ADRF6521 is fabricated in an advanced silicon- bandwidth is 2.5 GHz. The output buffers are capable of swinging germanium BiCMOS process and is available in a 20-lead, 1.5 V p-p into 100 loads at >55 dBc for second-order and exposed pad, 3 mm 3 mm LFCSP. Performance is specified third-order intermodulation distortion (IMD2 and IMD3), and over the 40C to +85C temperature range. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2020 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 24784-001ADRF6521 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Output DC Offset Circuit ......................................................... 29 Applications ....................................................................................... 1 Gain Control Interface ............................................................... 30 Simplified Functional Block Diagram ........................................... 1 Power-Down Function .............................................................. 30 General Description ......................................................................... 1 Applications Information .............................................................. 31 Revision History ............................................................................... 2 Basic Connections ...................................................................... 31 Specifications ..................................................................................... 3 Supply Decoupling ..................................................................... 31 Absolute Maximum Ratings ............................................................ 7 Input Signal Path ........................................................................ 31 Thermal Resistance ...................................................................... 7 Output Signal Path ..................................................................... 31 Electrostatic Discharge (ESD) Ratings ...................................... 7 Enable and Disable Function .................................................... 32 ESD Caution .................................................................................. 7 Gain Pin (VGN) Decoupling .................................................... 32 Pin Configuration and Function Descriptions ............................. 8 Output Impedance Matching ................................................... 32 Typical Performance Characteristics ............................................. 9 Single-Supply Operation ........................................................... 32 Single-Supply Operation ............................................................. 9 Dual-Supply Operation ............................................................. 32 Dual-Supply Operation ............................................................. 19 Avoiding Latch-Up ..................................................................... 32 Theory of Operation ...................................................................... 29 Outline Dimensions ....................................................................... 33 Input VVAs .................................................................................. 29 Ordering Guide .......................................................................... 33 Amplifiers .................................................................................... 29 Output Common-Mode Voltage .............................................. 29 REVISION HISTORY 11/2020Revision 0: Initial Version Rev. 0 Page 2 of 33