Digital Circuits
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An ultrasonic, or sonar, range finder is a common sensor in robotic systems and industrial environments. Even home and automotive uses are possible. A novel sensor design consists of a WC, a few peripheral components, and a pair of ultrasonic transducers....
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Application Note 381 contains information necessary to interface the Motorola MPC8260 processor to the DS2155 T1/E1/J1 Single Chip Transceiver (SCT). The application note covers interfacing both the address and data processor bus and the communications....
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A design example for a portable data acquisition system is offered that greatly simplifies the circuit design task. A reduction from seven components down to three components is accomplished with a design that has lower system cost, faster time-to-market,....
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Like its predecessor, AN67, this Application
Note includes circuits for high speed video, interface
and hot swap circuits, active RC and switched capacitor
filter circuitry and a variety of data conversion and
instrumentation circuits...
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The most important criteria of a data-acquisition system for college science laboratories are simplicity and price rather than precision or speed. The data-acquisition system in Figure 1 offers adequate precision of less than 0.5% and speed of 1 Hz to....
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Here`s a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring....
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The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL switch or preprogrammed Start/Stop Time. The format of uploading data....
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Application Note 67 is a collection of circuits from the first
five years of Linear Technology, targeting data conversion,
interface and signal processing applications. This
Application Note includes circuits such as fast video
multiplexers for high....
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The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), two lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1).
This circuit is based on the fact that a....
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The current concept incorporates a wireless transmitter and receiver and is thought to be used for remote controlled airplanes or appliances with two seperate parts. In other words, we have one dedicated transmitter (acquisition, filtering) and one dedicated....
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The TMP03* is a complete temperature data-acquisition system on a monolithic silicon chip. Including a silicon-based sensor, internal voltage reference, and sigma-delta A/D converter, it fits in a 3-pin (power, common, and output) TO-92 transistor package.....
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Sensitive systems, such as those in aircraft, must withstand fault conditions, thereby avoiding component and system damage, because a sensor failure could cause a catastrophic event to occur. A channel protector, comprising two n-channel MOSFETs connected....
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Using a product developed for PC-motherboard environmental monitoring, you can configure a low-cost, general-purpose DAS (data-acquisition system) (Figure 1). The DAS can directly monitor multiple voltage channels as well as temperature and frequency. It can....
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This application note features 8-, 10-, and 12-bit data
acquisition components in various circuit configurations.
The circuits include battery monitoring, temperature sensing,
isolated serial interfaces, and microprocessor and
microcontroller serial and....
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The circuit in Figure 1 shows the versatility of the
LTC2418. A combination of single-ended, differential,
unipolar and bipolar input sources are simultaneously
applied to the LTC2418...
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Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone. This microcontroller is in-circuit programmable using an SPI interface. The SPI pins are also....
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This application note describes techniques of using a PC based Digital I/O Board to characterize analog-to-digital converters (ADCs). It will look at static DC parameters such as integral nonlinearity (INL), differential nonlinearity (DNL), gain, and offset....
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Industrial control systems continue to employ standard analog signals for transmitting data between the process and the control equipment. Robust, 4-to-20mA current-loop signals that are easily transmitted over several thousand feet, ±5 and ±10V signals are....
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The LTC®2400 is the industrys first No Latency TM ADC
that combines automatic offset and full-scale calibration,
an internal oscillator, a sinc4 digital filter, and serial I/O to
yield a 24-bit ADC with 1.5µVRMS input noise and singleshot
conversion time....
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Figure 1 illustrates the simplified block diagram of a typical high-speed data converter system. The system consists of a bandpass filter, ADC, high-frequency clock, high-speed storage device, and post processing unit. Aside from the MAX104, the....
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The design in Figure 1 is a visible optical link for those who need to see the transmitted data. An isolation figure of more than 5000V is a bonus. Tests of the system used the COM input of a data-acquisition system, as well as a standard PC`s COM port. The....
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Another method that helps program development besides a dot LED as the output device is a serial bit. With a serial transmission to a terminal emulator program, developer may then test program running easier than a dot LED. One of my circuit uses PIC16F84....
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The method in Figure 1a needs no access or knowledge of the communicating devices. A C program opens two COM ports and installs interrupt-service routines for IRQ4 and IRQ3. Upon the reception of an interrupt, the routine stores a byte in a common circular....
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The circuit consists of two sections, one being a DC/DC
converter and the other being a pair of dual N-channel
MOSFETs and their associated high-side drivers that effectively
form a DPDT switch...
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The rapid, widespread use of 3.3V logic circuits complicates
the selection of RS232 interface circuits. The optimum choice
of an interface circuit should be based upon several application
dependent factors:
1) Logic circuitry connected to interface chip....
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The RS232 transceiver supports both RS232 and EIA-562
standards, whereas the RS485 transceiver supports both
RS485 and RS422 standards. The logic input (MODE) selects
between RS232 and RS485 modes. With three additional
control logic inputs (RXEN, DXEN....
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While the normal PC hardware might well run with just Tx, Rx and Ground connected, most driver software will wait forever for one of the handshaking lines to go to the correct level. Depending on the signal state it might sometimes work, other times it might....
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A state-of-the-art silicon temperature sensor like MAX6577 measures a remote temperature far from
the host system. The temperature sensor converts this temperature into a square wave with a
frequency proportional to the absolute temperature of its package,....
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PBUS is an RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven devices. Protocol and software is written by Jap. Just include a separate pbus library file into your project and add your command handlers for the specific device....
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Hand held computers are rapidly moving to 3V logic to save
power. Yet higher voltage buses are still utilized elsewhere in
the system for display driving and other functions. The
LT1330 is functionally equivalent to the LT1237 but operates
from 5V with a....
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Figure 1 shows a simple, cost-effective way of providing these bias voltages. A step-up regulator, IC1, forms the heart of the circuit. This regulator switches at a constant frequency of 1 MHz and a fixed duty cycle of 70%. IC1 steps up the input voltage to....
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I recently needed to control nine seven-segment displays for a microcontroller`s serial port. The complication I faced was the need to provide a continuous brightness adjustment for all the digitsfrom completely dark to fully bright. I couldn`t easily use....