Radar Receive Path AFE: 4-Channel LNA and PGA Data Sheet ADA8282 FEATURES FUNCTIONAL BLOCK DIAGRAM 4 channels of low noise amplifiers (LNAs) followed by ADA8282 programmable gain amplifiers (PGAs) +INA +OUTA 3nVHz LNA PGA Minimum 3 dB bandwidth of 5 MHz INA OUTA Typical 3 dB bandwidth of 42.3 MHz +24dB 6dB TO +12dB Typical slew rate of 28 V/s +INB +OUTB Differential input and output LNA PGA 3nVHz Gain of 18 dB to 36 dB in 6 dB steps INB OUTB Selectable low noise and low power modes +24dB 6dB TO +12dB Input referred noise of 4.5 nV/Hz at 18.3 mW per channel +INC +OUTC Input referred noise of 3.8 nV/Hz at 26.5 mW per channel 3nVHz LNA PGA INC OUTC Input referred noise of 3.6 nV/Hz at 34.8 mW per channel +24dB 6dB TO +12dB Input referred noise of 3.4 nV/Hz at 54.8 mW per channel +IND +OUTD Channel to channel gain matching of 0.25 dB LNA PGA 3nVHz Absolute gain error of 0.5 dB IND OUTD SPI programmable +24dB 6dB TO +12dB Power-down mode (SPI selectable) POWER GAIN MODE SELECT 3.1 V p-p differential output swing when using a 3.3 V supply 32-lead, 5 mm 5 mm LFCSP package SPI Specified from 40C to +125C Qualified for automotive applications CS SCLK SDI SDO VIO AVDD RESET APPLICATIONS Figure 1. Automotive radar Adaptive cruise control Collision avoidance Blind spot detection Self parking Electronic bumpers GENERAL DESCRIPTION The ADA8282 is designed for applications that require low cost, The ADA8282 can be configured in four power modes that low power, compact size, and flexibility. The ADA8282 has four trade off power and noise performance to optimize the overall parallel channels, each including an LNA and a PGA. The LNA performance according to the end application. and PGA combine to form a signal chain that features a gain range Fabricated in an advanced complementary metal-oxide of 18 dB to 36 dB in 6 dB increments with a guaranteed semiconductor (CMOS) process, the ADA8282 is available in a minimum bandwidth of 5 MHz. 5 mm 5 mm, RoHS-compliant, 32-lead LFCSP. It is specified Using the highest power settings, the combined input referred over the automotive temperature range of 40C to +125C. voltage noise of the combined LNA and PGA channel is 3.4 nV/Hz at maximum gain. 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Technical Support www.analog.com 13132-001ADA8282 Data Sheet TABLE OF CONTENTS Features........................................................................................... 1 Output Swing Variation with Gain......................................... 12 Applications ................................................................................... 1 Offset Voltage Adjustments .................................................... 12 Functional Block Diagram ............................................................ 1 Single-Ended or Differential Input......................................... 12 General Description ...................................................................... 1 Short-Circuit Currents ............................................................ 12 Revision History ............................................................................ 2 SPI Interface ............................................................................. 12 Specifications ................................................................................. 3 Channel to Channel Phase Matching..................................... 13 Digital Specifications ................................................................. 4 Applications ................................................................................. 14 Absolute Maximum Ratings ......................................................... 5 Increased Gain Using Two ADA8282 Devices in Series ....... 14 Thermal Resistance ................................................................... 5 Multiplexing Inputs Using Multiple ADA8282 Devices ....... 15 ESD Caution............................................................................... 5 Basic Connections for a Typical Application......................... 16 Pin Configuration and Function Descriptions............................ 6 Register Map ................................................................................ 17 Typical Performance Characteristics............................................ 7 Register Summary ................................................................... 17 Theory of Operation.................................................................... 11 Register Details ........................................................................ 17 Radar Receive Path AFE.......................................................... 11 Outline Dimensions .................................................................... 21 Default SPI Settings ................................................................. 11 Ordering Guide............................................................................ 21 Input Impedance...................................................................... 11 Automotive Products............................................................... 21 Power Modes............................................................................ 11 Programmable Gain Range ..................................................... 12 REVISION HISTORY 7/15Revision 0: Initial Version Rev. 0 Page 2 of 21