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Data Sheet
3 GHz Variable Gain LNA with Integrated ½ W Driver Amplifier ADL5246
FEATURES
GENERAL DESCRIPTION
RF output frequency range: 0.6 GHz to 3 GHz Output IP3: 37 dBm at 2.2 GHz Output P1dB: 28 dBm at 2.2 GHz Noise figure of input amplifier: 1 dB at 2.2 GHz Maximum gain: 31.5 dB at 2.2 GHz Voltage variable attenuation range: 45 dB 0 V to 3.3 V attenuation control range Integrated bypass switch for low noise VGA Matched 50 Ω input stage 3.3 V to 5 V single supply 32-lead, 5 mm × 5 mm LFCSP package
APPLICATIONS
Multistandard radio receivers Point to point Rx and Tx Instrumentation Military and aerospace
The ADL5246 is a high performance, low noise variable gain amplifier (VGA) optimized for multistandard base station receivers and point to point receive (Rx) and transmit (Tx) applications. The low noise figure and excellent linearity performance allow the device to be used in a variety of applications.
The device consists of a low noise amplifier, a high linearity VGA, and a ½ W output driver stage. The variable attenuator networks are optimized to provide high linearity performance over the 45 dB gain control range. Gain is set using a unipolar control voltage from 0 V to 3.3 V. The output stage of the ADL5246 is an externally tuned ½ W driver amplifier, which allows the device to be optimized anywhere between the 0.6 GHz to 3 GHz range, with an average tuning bandwidth of 200 MHz wide. An external filter can be used between the VGA and the final driver amplifier. The ADL5246 can be biased between 3.3 V and 5 V to trade off between performance and power consumption.
The ADL5246 is fabricated on an advanced GaAs process. The device is available in a 32-lead, RoHS compliant, 5 mm × 5 mm LFCSP and thermally rated to operate over the −40°C to +105°C temperature range.
FUNCTIONAL BLOCK DIAGRAM
RFIN2 VGAIN1 VSW1 VSW1 VGAIN2 RFOUT2 RFIN3 VPOS1 VPOS2
RFOUT1 32
30 15
6 13
16 18
21 11 28
AMP1 RFIN1 2
VVA1
AMP2
VVA2
AMP3 26 RFOUT3
ADL5246
4 5 7 8 9 12 14 17 19 22
1 3 10 20 23 24 25 27 29 31
EP NIC GND
Figure 1.
12233-001
Rev. A
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ADL5246
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8 ESD Caution.................................................................................. 8 Pin Configuration and Function Descriptions............................. 9 Typical Performance Characteristics ........................................... 10
REVISION HISTORY
9/15—Rev. 0 to Rev. A Changes to Table 1............................................................................ 5 Added Figure 21 to Figure 26; Renumbered Sequentially ........ 13 Added Figure 27 to Figure 32........................................................ 14 Added Figure 33 to Figure 38........................................................ 15 Changes to Figure 57, Figure 58, Figure 59................................. 19 Changes to Full Chain Operation Considerations Section....... 28
4/14—Revision 0: Initial Version
Data Sheet
Terminology .................................................................................... 22 Theory of Operation ...................................................................... 23
Basic Connections...................................................................... 23 Error Vector Magnitude (EVM) Performance........................... 27 Thermal Information and Recommended PCB Land Pattern...28 Full Chain Operation Considerations ..................................... 28 Evaluation Board ............................................................................ 29 Characterization Inf.