AD8284 Datasheet, PDF (1/28 Pages) Analog Devices – Radar Receive Path AFE - 4-Channel Mux

Data Sheet
Radar Receive Path AFE: 4-Channel Mux
with LNA, PGA, AAF, and ADC
AD8284
FEATURES
4-channel mux to LNA, PGA, AAF
1 direct-to-ADC channel
Programmable gain amplifier (PGA)
Includes low noise preamplifier (LNA)
SPI-programmable gain = 17 dB to 35 dB in 6 dB steps
Antialiasing filter (AAF)
Programmable third-order low-pass elliptic filter (LPF) from
9 MHz to 15 MHz
Analog-to-digital converter (ADC)
12 bits of accuracy of up to 60 MSPS
SNR = 67 dB
SFDR = 68 dBc
Low power, 345 mW at 12 bits per 60 MSPS
Low noise, 3.5 nV/√Hz maximum of input referred
voltage noise
Power-down mode
64-lead, 10 mm × 10 mm TQFP 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
GENERAL DESCRIPTION
The AD8284 is an integrated analog front end designed for low
cost, compact size, flexibility, and ease of use. It contains a
4-channel differential multiplexer (mux), a 1-channel low noise
preamplifier (LNA) with a programmable gain amplifier (PGA)
and an antialiasing filter (AAF), as well as one direct-to-ADC
channel, all integrated with a single, 12-bit analog-to-digital
converter (ADC). The AD8284 also incorporates a saturation
detection circuit for high frequency overvoltage conditions that
would otherwise be filtered by the AAF.
The analog channel features a gain range of 17 dB to 35 dB in
6 dB increments, and an ADC with a conversion rate of up to
60 MSPS. The combined input referred voltage noise of the entire
channel is 3.5 nV/√Hz at maximum gain. The channel is optimized
FUNCTIONAL BLOCK DIAGRAM
INA+
INA–
INB+
INB–
SATURATION
DETECTION
REFERENCE
AD8284
INC+
MUX LNA
PGA
AAF
INC–
IND+
IND–
MUX
12-BIT
ADC
D0
TO
D11
INADC+
INADC–
SPI
Figure 1.
for dynamic performance and low power in applications where
a small package size is critical.
Fabricated in an advanced CMOS process, the AD8284 is available
in a 10 mm × 10 mm, RoHS compliant, 64-lead TQFP. It is speci-
fied over the automotive temperature range of −40°C to +105°C.
Table 1. Related Devices
Part No. Description
AD8285 4-Channel LNA/PGA/AAF, pseudosimultaneous
channel sampling with ADC
AD8283 6-Channel LNA/PGA/AAF, pseudosimultaneous
channel sampling with ADC
ADA8282 4-Channel LNA/PGA
Rev. D
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