Project Code: APM_ADAS_2014
ADI ADAS Vision Solution
Application Description
The advanced driver assist system (ADAS) will see a steep growth in the years to come. One driving factor is the increased safety awareness and the desire
for more driving comfort on the customer side. But first and foremost Euro NCAP’s tightened safety requirements will boost installed ADAS equipment from
single digit take rates to almost 100% over the next few years. Hence it is to no surprise that the call for a commercially viable solution is on.
In many ways, vehicle safety can be greatly enhanced by vision-based ADAS. By installing rear/front/side cameras and vision processing ECU, multiple
features can be implemented to assist the driver in advance. Popular applications include LDW (lane departure warning), HB/LB (high beam and low beam
adjust), TSR (traffic sign recognition), parking assist, rear view/surround view, collision avoidance, and so on.
System Requirements and Design Challenges
The vision ADAS system typically includes video amplifying, encoding, transmitting, decoding, processing, and display. There is a trend toward increased
camera resolution and a greater number of cameras. There is an increasing number of functions per system, and comfort features are moving to safety
features, so all of these trends increase the requirements for the processor. Meanwhile, there are always higher requirements for the power-to-cost ratio of
signal processing.
From the start, the specification for these ADAS camera centric processors targeted the total cost of ownership (TCO) without taking the flexibility out of the
hands of the system suppliers and OEMs. Aside from the required programmability and processing power, having the lowest power consumption in class was
required in order to keep the thermal design manageable. Support for functional safety following ISO 26262 and the availability of an application oriented
development environment with optimized vision processing libraries would enable the design of a total system with “time to market” and low risk in mind.
Solutions from ADI
The ADSP-BF60x family reduces the overall cost of a five function system by up to 30%. The ADSP-BF609 (processing up to megapixel format) and the
ADSP-BF608 (processing up to VGA format) support up to five concurrent vision functions with up to 30 processed frames per second. With <1.3 W at an
ambient temperature of 105°C, the ADSP-BF60x offer the lowest power consumption figures in their class.
To enable this, Analog Devices deployed a straightforward but unique concept. It is based on two Blackfin® cores as they are used in production ADAS systems
today. However, algorithms that can’t be modeled by software in a highly efficient and economical way have been implemented as hardware engines instead,
resulting in a highly configurable toolbox of vision processing units. Analog Devices calls this the “pipelined vision processor” (PVP) comma which is now part
of the new ADSP-BF60x processors. Although implemented on low power process technology, further innovation was needed to also tackle the dominating
power dissipation of modern designs: external memory (DDR2) interfaces. Lowest power dissipation is achieved by distribution of processing and by smart
utilization of moderate memory bandwidth. In addition, the Blackfin architecture has been enriched by a number of hardware blocks to address functional
safety requirements.
Altogether, ADI provides a broad range of video decoder/encoder, video multiplexer/switch, and video amplifiers with outstanding performance.
Main Signal Chain
ADAS camera—smart camera ECU
VISION SENSOR
VIDEO OUT
SMART CAMERA ECU
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OPT. VIDEO OUT
PROCESSING
CAR BUS
ADAS ECU—Camera and Central Processing ECU
VISION SENSOR
VIDEO OUT
PROCESSING
VIDEO OUT
CAR BUS
HEAD UNIT
ADAS Camera
Notes: The signal chains above are representative of an ADAS system. The technical requirements of the blocks vary, but the products listed in the table are representative of ADI’s
solutions that meet some of those requirements.
ADI Products
Product Name
Description
Ta
Package
DSPs
ADSP-BF606
Dual 400 MHz core, 148 kB L1, 128 kB L2, external 250 MHz DDR2, 3× ePPI, 1× CAN
−40°C to +105°C
BGA 349
ADSP-BF607
Dual 500 MHz core, 148 kB L1, 256 kB L2, external 250 MHz DDR2, 3× ePPI, 1× CAN
−40°C to +105°C
BGA 349
ADSP-BF608
Dual 500 MHz core, PVP engine supporting VGA, PIXC engine, 148 kB L1, 256 kB L2, external 250 MHz
DDR2, 3× ePPI, 1× CAN
−40°C to +105°C
BGA 349
ADSP-BF609
Dual 500 MHz core, PVP engine supporting HD, PIXC engine, 148 kB L1, 256 kB L2, external 250 MHz
DDR2, 3× ePPI, 1× CAN
−40°C to +105°C
BGA 349
2 | ADI ADAS Vision Solution
ADI Products (Continued)
Product Name
Description
Ta
Package
Video Decoders
ADV7180W
CVBS decoder, SDTV, 3-channel/6-channel inputs, NTSC/PAL/SECAM input, 8-/16-bit BT656 output
−40°C to +125°C
LFCSP-32/LFCSP-40
LQFP-48/LQFP-64
ADV7181CW
RGB decoder, SD/HDTV, 6-channel inputs, NTSC/PAL/SECAM input, 8-/16-bit BT656 output
−40°C to +85°C
LQFP-64
ADV7182W
CVBS decoder, SDTV, SE/Differential inputs, NTSC/PAL/SECAM input, 8-bit BT656 output, cable diagnostics
−40°C to +105°C
LFCSP-32
ADV7186W
6-channel SD/HD decoder, 3D comb filter, bitmap OSD and overlay capability, scaler deinterlacing display
controller, LVDS Rx and Tx
−40°C to +85°C
BGA-196
ADV7280W
10-bit, 4× oversampled SDTV video decoder with deinterlacer
−40°C to +105°C
LFCSP-32
Video Encoders/DACs
ADV7392/
ADV7393W
SD/HD encoder, YCrCb/RGB input, CVBS/S-Video/YPrPb/RGB output
−40°C to +85°C
LFCSP-40
ADV7125W
CMOS 330 MHz triple 8-bit video DAC, complementary outputs
−40°C to +85°C
LFCSP-48
LQFP-48
RGB-CVBS Converters
AD723W
Low cost RGB to PAL/NTSC encoder with load detect, 2.7 V to 5 V
−40°C to +85°C
TSSOP-28
AD725W
Low cost RGB to PAL/NTSC encoder, 5 V
−40°C to +85°C
SOIC-16
ADA4851-1/
ADA4851-2/
ADA4851-4W
Single/dual/quad video amplifier, 130 MHz, rail-to-rail output, 3 V to 10 V supply
−40°C to +125°C
SOT-23/MSOP-8/
TSSOP-14
ADA4430-1W
Single video amplifier, fixed low pass SD video filter, ultra low power, rail-to-rail output, 2.65 V to 6 V supply −40°C to +125°C
SOT-23
ADA4830-1/
ADA4830-2W
Difference video amplifier, gain=0.5 MHz, 85 MHz @ 3 dB, short-to-battery protection, 3 V to 5 V supply
−40°C to +105°C
LFCSP-8
−55°C to +150°C
SOIC-8
Video Amplifiers
Temperature Sensors
ADT7311W
−55°C to +150°C, ±0.5°C accuracy, SPI, 2.7 V to 5.5 V supply
Design Resources
Hardware Development Boards
• ADSP-BF60x standard evaluation board and extender boards
• Frontview ADAS development Kit (please contact ADI sales)
ADSP-BF60x DSP IDE: CCES
Standard Software Modules
• ADAS vision analytics toolbox (AVAT)
• Blackfin image processing toolbox (IPTBX)
• 2D graphics toolbox (GFX2D)
• Download from: www.analog.com/blackfinmodules
Reference Code of Vision ADAS Framework and Algorithms
• Function of LDW, FCW, TSR, HBA, PD (please contact ADI sales)
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