Digital signal processor (DSP) is the result of the fusion of digital signal processing theory and VLSI technology. At present, DSP technology is widely used in communication, voice, image, aerospace, instrumentation and other fields, and is playing an increasingly important role in promoting the digitization of contemporary information processing.
In the field of low bit rate multimedia communication using video lines to transmit video images, if you choose a dedicated chip for image processing, such as SAA7110, 8 × 8 3104VCP and LSI ’s dedicated chip, or use a high-end DSP with high-speed computing performance for Image processing will greatly increase the price. This article introduces an image acquisition card using TI's low-end DSP chip TMS320F206 and video A / D chip TLC5510, which provides an inexpensive solution for low bit rate multimedia communications.
1 Brief introduction of TLC5510 chip and TMS320F206 chip
1.1 Introduction to TLC5510
The TLC5510 is a CMOS, 8-bit, 20MSPS analog / digital device (ADC), which utilizes a semiflash architecture. The TLC5510 is powered by a single 5V power supply and consumes only 100mW of power. It also has an internal sample and hold circuit, a high-impedance parallel output, and an internal reference resistor.
Compared with flash converters, the semi-flash structure reduces power consumption and chip size. By implementing the conversion in a 2-step-process, the number of comparators can be greatly reduced. The waiting time for converting data is 2.5 clock cycles.
No external reference voltage source and precision resistors are required, and only the internal reference resistor and VDDA can achieve a full-scale conversion range of 2V. The linearity error at 25 ° C is ± 0.75LSB, and the maximum linearity error over the entire temperature range is ± 1LSB. The differential linearity error at 25 ° C is ± 0.5LSB, and the maximum differential linearity error over the entire temperature range is ± 0.75LSB.
1.2 Introduction to TMS320F206
TMS320F206 is a DSP chip launched by TI. It is a high-speed fixed-point digital processing chip based on TMS320C5x. It has the characteristics of an improved Harvard structure (parallel separate program and data bus), high-performance CPU, and efficient instruction set. Its main features are as follows:
The CPU has a 32-bit CALU, a 32-bit accumulator, a 16 × 16-bit parallel multiplier, three shift registers, and eight 16-bit auxiliary registers.
The memory has 224K words addressable storage space, 544 words on-chip DRAM, 4K words on-chip SRA or 32K bytes of flash memory.
The instruction speed is 50ns, 35ns and 25ns single instruction cycle.
Peripheral circuits include software programmable timers, software programmable wait state generators, on-chip phase-locked loop clock generators, synchronous and asynchronous serial ports.
2 Hardware interface circuit design
2.1 TLC5510 front-end circuit design
The TLC5510 front-end circuit is shown in Figure 1.
In the circuit, the analog power supply VDDA and the digital power supply VDDD are independent of each other. Between VDDA and digital ground AGND and between VDDD and analog ground DGND, 4.7μF capacitor, 0.1μF capacitor and ferrite magnetic ring are used to decouple and eliminate power supply ripple. AGND and DGND are separated to avoid the digital signal from bringing noise to the analog signal. The amplified video signal is directly added to the 19 pin of TLC5510. The clock signal of TLC5510 is provided by the clock signal output pin CLKOUT1 of TMS320F206.
2.2 TLC5510 and TMS320F206 interface circuit design
The interface circuit diagram of TLC5510 and TMS320F206 is shown in Figure 2. 
The TLC5510 digital ground is connected to the TMS320F206 ground. Because there is a digital output buffer inside the TLC5510, the pins [D1: D8] gn TMS320F206 pins [D0: D7] of the TLC5510 are directly connected. The CLKOUTI pin of TMS320F206 provides a clock signal to TLC5510 through a small resistor. TMS320F206 pins A11 and IS are logic control. When A11 is logic high and IS is logic low, TMS320F206 can read sample data from TLC5510. funcTIon ImgZoom (Id) // Re-set the image size to prevent the form from being broken {var w = $ (Id) .width; var m = 550; if (w <m) {return;} else {var h = $ (Id) .height; $ (Id) .height = parseInt (h * m / w); $ (Id) .width = m;}} window.onload = function () {var Imgs = $ ("content"). getElementsByTagName ( "img"); var i = 0; for (; i
2.54mm (0.1") Pitch Female Headers
Overview
The most commonly seen female headers are 2.54mm (0.1") single or double row female/socket headers. These female headers together with its male counterpart are used in connecting Arduino boards and shields together. 2.54mm pitch female sockets/headers are low-profile connectors designed for signal and low power PC board connections when space is at a premium. They have the perfect height for clearing the USB-B connector and great for stacking multiple shields.
Since 2.54mm pitch female header is commonly used in a lot of applications, Scondar offers numerous options for this type of female header. Orientation can either be SMT or THM, single, dual or triple row. Antenk offers 2.54mm pitch female headers in either vertical or right-angle orientation. The pins and blades are also available in various sizes, counts, amperages, and plating.
The 2.54mm can accommodate a maximum current of 3A, with a 30 to 22 AWG wire size, and up to 40-positions. Antenk offers these female headers in high quality and affordable China-quoted price that snuggly fits with the pins of a Male Header and acts as a receptacle.
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Applications of 2.54mm Pitch Female Headers
Electronics:
LED applications
Arduino boards
Arduino Pro
Arduino Mega
Solar applications
Weighing systems
Appliances:
Air conditioner
Refrigerator
Microwave oven
Washing machine
Water heater
Shower toilet
Washer/Dryer
Stove
Automotive, Heavy Duty Military and Marine
For densely packed equipment requiring weight reduction and downsizing and for tough and harsh conditions.
Vehicle infotainment
Computer peripherals
Battery Connections
Battery connections rely on the ability of the current to pass reliable and solid current. This prevents overheating in the circuit and voltage drop.
Rechargeable battery packs
Battery balancers
Battery eliminator circuits
Medical Diagnostic and Monitoring equipment
Heart monitors
Telecoms
Datacoms
Mount Type: Through-hole vs Surface Mount
At one side of this female header is a series of pins which can either be mounted and soldered directly onto the surface of the PCB (SMT) or placed into drilled holes on the PCB (THM).
Through-Hole (Poke-In)
Best used for high-reliability products that require stronger connections between layers.Aerospace and military products are most likely to require this type of mounting as these products experience extreme accelerations, collisions, or high temperatures.
Useful in test and prototyping applications that sometimes require manual adjustments and replacements.
2.54mm, 1-row vertical female header, 2.54mm, 2-row vertical female header, 2.54mm, 3-row vertical female header, 2.54mm, 1-row right-angle female header and 2.54mm, 2-row right-angle female header, 2.54mm U-
Shaped Female header, 2.54mm U-Shaped Dual Row Female header are examples of Antenk products with through-hole mount type.
Surface-Mount
The most common electronic hardware requirements are SMT.
Essential in PCB design and manufacturing, having improved the quality and performance of PCBs overall.
Cost of processing and handling is reduced.
SMT components can be mounted on both side of the board.
Ability to fit a high number of small components on a PCB has allowed for much denser, higher performing, and smaller PCBs.
2.54mm, 2-row right-angle female header and 2.54mm, 1-row right-angle female header are Antenk`s featured SMT female headers.
Orientation/Pin-Type: Vertical (Straight), Right-Angle and U-Shaped
2.54mm pitch female headers may be further classified into pin orientation as well, such as vertical or straight female header, right-angle female header or U-shaped female header.
Vertical or Straight Female Header Orientation
One side of the series of pins is connected to PCB board in which the pins can be at a right-angle to the PCB surface (usually called "straight" or [vertical") or..
Right-Angle Female Header Orientation
Parallel to the board's surface (referred to as "right-angle" pins).
U-Shaped Female Header Orientation
U-shaped orientation is characterized by the shape of the pins at one side of the header, forming a letter [U". It is often chosen for applications where repeat mating cycles are not required as it can also be used and soldered directly to both PCB's.
Each of these pin-types have different applications that fit with their specific configuration.
Single, Dual or Multiple Number of Rows
For a 2.54mm straight or vertical female header, the standard number of rows that Antenk offers ranges from 1 to 2 rows. However, customization can be available if 3, 4 or n number of rows is needed by the customer. Also, the number of contacts for the single row is about 2-40 pins while for dual row, the number contacts may vary from 2-80 pins.
Pin Material
The pins of the connector attached to the board have been designed with copper alloy. With customer`s demand the pins can be made gold plated.
Custom 2.54mm Pitch Female Headers
Customizable 2.54 mm pitch female headers are also available, making your manufacturing process way faster as the pins are already inserted in the headers, insulator height is made at the right size and the accurate pin length you require is followed.
Parts are made using semi-automated manufacturing processes that ensure both precision and delicacy in handling the headers before packaging on tape and reel.
Tape and Reel Packaging for SMT Components
Antenk's SMT headers are offered with customizable mating pin lengths, in which each series has multiple number of of circuits, summing up to a thousand individual part number combinations per connector series.
The tape and reel carrier strip ensures that the headers are packaged within accurately sized cavities for its height, width and depth, securing the headers from the environment and maintaining consistent position during transportation.
Antenk also offer a range of custom Tape and reel carrier strip packaging cavities.
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ShenZhen Antenk Electronics Co,Ltd , https://www.antenk.com