Radar Receive Path AFE:

6-Channel LNA/PGA/AAF with ADC

Data Sheet

AD8283

Rev. C

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FEATURES

6 channels of LNA, PGA, AAF

1 channel of direct-to-ADC

Programmable gain amplifier (PGA)

Includes low noise preamplifier (LNA)

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 MHz to 12 MHz

Analog-to-digital converter (ADC)

12 bits of accuracy up to 72 MSPS

SNR = 67 dB

SFDR = 68 dB

Low power, 170 mW per channel at 12 bits/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

REFERENCE

SPI

INA+

INA–

INB+

INC+

INC–

INB–

IND+

IND–

INE+

INE–

INF+

INF–

12-BIT

ADC

DSYNC

D[0:11]

AAF

AD8283

AAF

AAF

AAF

AAF

AAF

DRV

PGA

LNA

PGA

LNA

PGA

LNA

PGA

LNA

PGA

LNA

PGA

LNA

INADC+

INADC–

MUX

Figure 1.

GENERAL DESCRIPTION

The AD8283 is designed for low cost, low power, compact size,

flexibility, and ease of use. It contains six 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 CMOS process, the AD8283 is

available in a 10 mm × 10 mm, RoHS-compliant, 72-lead

LFCSP. It is specified 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

AD8284

4-Channel LNA/PGA/AAF, sequential channel

sampling with ADC

ADA8282

4-Channel LNA/PGA