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AD8285CP-EBZ Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer AD8285CP-EBZ
Bauteilbeschribung  Radar Receive Path AFE - 4-Channel LNA/PGA/AAF with ADC
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Radar Receive Path AFE: 4-Channel
LNA/PGA/AAF with ADC
Data Sheet
AD8285
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rights of thirdparties that may result from its use. Specifications subject to changewithout notice.
No license is granted by implication or otherwise under any patent or patent rights of Analog
Devices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2014–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
4-channel LNA, PGA, and AAF
1 direct to ADC channel
Programmable gain amplifier (PGA)
Includes low noise preamplifier (LNA)
Serial peripheral interface (SPI) programmable gain
16 dB to 34 dB in 6 dB steps
Antialiasing filter (AAF)
Programmable third order, low-pass elliptic filter (LPF)
from 1.0 MHz to 12.0 MHz
Analog-to-digital converter (ADC)
12 bits of accuracy up to 72 MSPS
Signal-to-noise ratio (SNR): 68.5 dB
Spurious-free dynamic range (SFDR): 68 dB at gain = 16 dB
Low power: 185 mW per channel at 12 bits and 72 MSPS
Low noise: 3.5 nV/√Hz maximum of input referred voltage noise
Power-down mode
72-lead, 10 mm × 10 mm LFCSP package
Specified from −40°C to +105°C
Qualified for automotive applications
APPLICATIONS
Automotive radar
Adaptive cruise control
Collision avoidance
Blind spot detection
Self parking
Electronic bumper
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GENERAL DESCRIPTION
The AD8285 is designed for low cost, low power, compact size,
flexibility, and ease of use. It contains four channels of a low noise
preamplifier (LNA) with a programmable gain amplifier (PGA)
and an antialiasing filter (AAF) plus one direct to ADC channel, all
integrated with a single 12-bit analog-to-digital converter (ADC).
Each channel features a gain range of 16 dB to 34 dB in 6 dB
increments and an ADC with a conversion rate of up to 72 MSPS.
The combined input referred noise voltage of the entire channel
is 3.5 nV/√Hz at maximum gain. The channel is optimized for
dynamic performance and low power in applications where a
small package size is critical.
Fabricated in an advanced complementary metal oxide
semiconductor (CMOS) process, the AD8285 is available in a
10 mm × 10 mm, RoHS compliant, 72-lead LFCSP that is specified
over the automotive temperature range of −40°C to +105°C.
Table 1. Related Devices
Part No.
Description
AD8283
6-channel LNA/PGA/AAF, pseudo simultaneous
channel sampling with ADC
AD8284
4-channel LNA/PGA/AAF, sequential channel
sampling with ADC
ADA8282
4-channel LNA/PGA
REFERENCE
SPI
INA+
INA–
INB+
INC+
INC–
INB–
IND+
IND–
12-BIT
ADC
DSYNC
D[0:11]
AAF
AD8285
AAF
AAF
AAF
DRV
PGA
LNA
PGA
LNA
PGA
LNA
PGA
LNA
INADC+
INADC–
NOTES
1. AVDD18x = AVDD18, AVDD18ADC.
AVDD33x = AVDD33, AVDD33A, AVDD33B, AVDD33C, AVDD33D, AVDD33REF.
DVDD18x = DVDD18, DVDD18CLK. DVDD33x = DVDD33, DVDD33SPI, DVDD33CLK, DVDD33DRV.
MUX


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