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Digital to Analog (DAC) Circuits

Converters -- Main Page

Digital to Analog Circuits:    #'s - B      C - D        E - O      P - T      U - Z
 

Last Updated: October 24, 2017 02:54 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Cascode Lessens DAC Degradation 02/03/97 EDN-Design Ideas UPDATED LINK!  Current-output D/A converters usually deliver their best accuracy if the current-output(summing-junction) pin remains at a constant dc voltage, because of the finite output impedance of the current-out DAC output(Figure 1).  Two sources contribute to the output impedance.  One is the impedance of the R-2R ladder used to binary-scale the bit currents; the second is the nonlinear output impedance__ Circuit Design by Mark Shill, Burr-Brown, Tucson, AZ

CentronICs Port D/A converters & low-pass filter JDAC and CENT_DAC are both simple Digital to Analogue converter to use with your IBM PC/AT or compatible.  Those circuit are connected to Centronics parallel port and does not affect the normal port usage in any way.  The circuits are transparent to computer, so it is not possible to program to see if those devices are connected or not. __ Designed by Tomi Engdahl

Circuit compensates system offset of a load-cell-based balance 08/16/07  EDN-Design Ideas A dual DAC stores the system-offset voltage, which gets determined during a power-on calibration sequence.   It’s a challenge to interface a resistive bridge sensor with an ADC receiving its power from a 5V single-supply power source.  Some applications require output-voltage swings from 0V to a full-scale voltage, such as 4.096V, with excellent accuracy.  With most single-supply instrumentation amplifiers, problems arise when the output signal approaches 0V, near the lower output-swing limit of a single-supply instrumentation amp.  A good single-supply instrumentation amp may swing close to single-supply ground but does not reach ground even if it has a true rail-to-rail output.__ Circuit Design by Luca Bruno, ITIS Hensemberger, Monza, Italy

Circuit converts 5V to –10V 26-May-05 EDN-Design Ideas Switched-capacitor circuit doubles, inverts dc source__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Circuit converts DAC's outputs from single-ended to differential Mode 8-Jun-06 EDN-Design Ideas This design suits low-end ac applications or high-precision level-setting applications that rely on a single-ended current-output DAC__ Circuit Design by Liam Riordan, Analog Devices, Limerick, Ireland

Circuit Loads Eight-Channel DAC From PC Port 08/03/95 EDN-Design Ideas The circuit in Fig 1 loads 4 address bits and 8 data bits into IC8's 8-bit octal, two-quadrant multiplying DAC from a PC parallel port.  Initially, the circuit loads the desired data on the D0 through D7 pins of the parallel port into shift register IC1 when the parallel port's STR pin goes low.  Next, the circuit loads the desired address from the port's D0 through D3 pins into register IC2 when the port's ALF pin goes low__ Circuit Design by Daniel Segarra, Sipex Corp, Billerica, MA

Circuit maximizes pulse-width-modulated DAC throughput 03/22/13  EDN-Design Ideas This ramp-based DAC uses microcontroller-generated clocks and a sample-and-hold.  Simple DACs realized by lowpass filtering microcontroller-generated pulse-width-modulated (PWM) signals have a response that is typically a tenth of the PWM frequency.  This Design Idea is a novel implementation of a previously published method1 employing a reference ramp whose output is sampled and held by the PWM signal.  This approach results in a throughput rate equal to the PWM frequency.__ Circuit Design by Ajoy Raman

CMOS DACs Act as Digitally Controlled Voltage Dividers 06/26/08  EDN-Design Ideas You can employ a DAC to operate as a digitally programmable resistor from a single supply__ Circuit Design by John Wynne and Liam Riordan, Analog Devices, Limerick, Ireland

Combine two 8-bit outputs to make one 16-bit DAC 30-Sep-04 EDN-Design Ideas Inexpensive, 16-bit, monolithic DACs can serve almost all applications.  However, some applications require unconventional approaches.  This design idea design concerns circuitry I recently designed for a tunable-diode laser spectrometer for a Mars-exploration application.  The control circuitry included two 16-bit DACs that interface to the radiation-hardened, 8051-variant 69RH051A microcontroller__ Circuit Design by Steve Woodward, Chapel Hill, NC

Comparator/ DAC Combinations Solve Data Acquisition Problems App Note/ 647 / Oct-04___ Maxim Integrated

Compensate system offset of a load-cell-based balance 08/16/07  EDN-Design Ideas A dual DAC stores the system-offset voltage, which gets determined during a power-on calibration sequence.   It’s a challenge to interface a resistive bridge sensor with an ADC receiving its power from a 5V single-supply power source.  Some applications require output-voltage swings from 0V to a full-scale voltage, such as 4.096V, with excellent accuracy.  With most single-supply instrumentation amplifiers, problems arise when the output signal approaches 0V, near the lower output-swing limit of a single-supply instrumentation amp.  A good single-supply instrumentation amp may swing close to single-supply ground but does not reach ground even if it has a true rail-to-rail output.__ Circuit Design by Luca Bruno, ITIS Hensemberger, Monza, Italy

Component and Measurement Advances Ensure 16-Bit DAC Settling Time Linear Technology AN74 __ Designed by Jim WilliamsJul 1st, 1998

Control 32 DAC Channels via a Parallel Port EDN-Design Ideas July 8, 1998    This circuit controls 32 voltage-output channels from the parallel port of a PC.__ Circuit Design by Mark A Shill, Burr-Brown Corp, Tucson, AZ

Convert 5V to –10V 05/26/05  EDN-Design Ideas witched-capacitor circuit doubles, inverts dc source__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Convert DAC's outputs from single-ended to differential Mode 06/08/06  EDN-Design Ideas This design suits low-end ac applications or high-precision level-setting applications that rely on a single-ended current-output DAC__ Circuit Design by Liam Riordan, Analog Devices, Limerick, Ireland

Create a DAC From a Microcontroller's ADC 3-Dec-09 EDN-Design Ideas Use a microcontroller's ADC in the feedback loop__ Circuit Design by Vardan Antonyan, Glendale, CA

Crystal DAC: a High Performance Upgrade For the very best performance from 24-bit/96kHz recordingsuses the Crystal CS4398 DAC and a discrete transistor output stage___ SiliconChip

D/ a Converter Generates Multiple Precision Outputs App Note/ 30 / Jan-05___ Maxim Integrated

D/A-Converter ASIC Uses Stochastic Logic 10/24/96 EDN-Design Ideas To effect A/D and D/A conversion using ASICs, you usually need mixed-signal analog and digital processing.  Mixed-signal silicon is more expensive than purely digital circuitry to process and test.  In the case of FPGAs, you need external conversion circuitsTo effect A/D and D/A conversion using ASICs, you usually need mixed-signal analog and digital processing.  Mixed-signal silicon is more expensive than purely digital circuitry to process and test.  In the case of FPGAs, you need external conversion circuits__ Circuit Design by J Quero, C Janer, J Ortega, and L Franquelo, University of Seville, Seville, Spain

DAC & µP Implement Hardware Window Generator 03/31/94 EDN-Design Ideas A typical DSP system first converts an analog signal to digital, then performs windowing, and finally does a fast-Fourier transform.  However, you can accelerate this process by swapping the converting and windowing steps and implementing the windowing in hardware.  The multiplying DAC in Fig 1 performs the windowing of an input signal__ Circuit Design by Sergey Velichko, Extended Systems, Boise, ID

DAC & flip-flops form constant-current-source 23-Apr-09 EDN-Design Ideas Using two flip flops, you can program a serial-input DAC to produce a constant 4 mA__ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

DAC & Op Amp Generate Variable Negative Control Voltage App Note/ 107) 4 / Feb-05___ Maxim Integrated

DAC & Op Amp provide variable-control voltage 12/06/01 EDN-Design Ideas Early DACs contained standard R-2R ladder networks, and produced a negative output voltage.  These early DACs, such as the MAX7837/7847 and the MAX523, require both positive and negative supply rails to accommodate their negative output.  With the transition to single-supply ICs, however, many modern DACs operate with a single supply rail and an inverted R-2R ladder network__ Circuit Design by Chad Olson, Maxim Integrated Products, Sunnyvale, CA

DAC Calibrates 4- to 20-Ma Output Current 25-Jun-09 EDN-Design Ideas When your design requires self-calibration, this circuit will perform the task__ Circuit Design by Ronald Moradkhan and Steven Lau, Maxim Integrated Products, Sunnyvale, CA

DAC Controlled 100mA Current Source The LT3092 easily interfaces with an external DAC to allow digital current control. __ Linear Technology/Analog Devices App Note, Mar 24th 2010

DAC Fine-Tunes Reference Output 08/25/11  EDN-Design Ideas Adding a DAC and op amp makes a precision adjustable reference.  Data converters must have a stable reference voltage to accurately measure or generate analog signals.  Such references offer many guaranteed levels of precision and stability.  Their variety of output-voltage levels is much smaller, which manufacturers specify as standard values, such as 2.048, 2.500, or 4.096V.  You sometimes need to dynamically calibrate the reference, fine-tune its output value, or generate a slightly different value.  For instance, when you measure a voltage with a resistive divider, you could adjust the reference voltage to compensate for an error in the divider__ Circuit Design by Fons Janssen, Maxim Integrated Products, Bilthoven, Netherlands

DAC Powered Charge Pump Varies Negative Rail App Note #203___ Maxim Integrated

DAC to vary LVDT excitation 10/02/03  EDN-Design Ideas LVDTs (linear variable differential transformers] are electromechanical measuring devices that convert the position of a magnetic core into electrical signals.  You generate these signals via excitation on the primary side.  The result__ Circuit Design by Anthony Di Tommaso and Ljubisa Milojevic, ABB Inc, Natrona Heights, PA

DAC/ µP Supervisor Combination Improves Analog I/ O Reliability App Note/ 353 / Mar-05___ Maxim Integrated

DC-Accurate, 32-Bit DAC Achieves 32-Bit Resolution 30-Oct-08 EDN-Design Ideas A DAC circuit sums two 16-bit PWM signals via solid-state switches to achieve 32-bit resolution__ Circuit Design by W Stephen Woodward, Chapel Hill, NC

DDS IC plus frequency-to-voltage converter make low-cost DAC 02/05/04  EDN-Design Ideas Precision DACs are essential in many consumer, industrial, and military applications, but high-resolution DACs can be costly.  Frequency-to-voltage converters have good nonlinearity specifications—typically, 0.002% for the AD650—and__ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

Deglitching Techniques for High Voltage R 2R DACs App Note/ 583 / Jun-05___ Maxim Integrated

Designing high-current chokes is easy 24-Jun-04 EDN-Design Ideas Somewhat unusually, This design idea deals with a formula rather than a circuit.  You might think that all the basic formulas of magnetic phenomena were discoveredthan a century ago.  In fact, they probably were, but, at the time, some were of little practical interest and were essentially disregarded and never included in books or formula tables__ Circuit Design by Louis Vlemincq, Belgacom, Evere, Belgium

Designing High-Current VRM Compliant CPU Power Supplies 10/26/00 EDN-Design Ideas Modern high-speed microprocessors require fast delivery of enormous supply currents in microsecond time frames, tight supply-voltage tolerance, and intelligent voltage programming.  The latest CPU voltage-regulator specifications from Intel and AMD call for load-current slew rates of 50 to 200A/µsec and peak currents of 60 to more than 120A.  These demands are transforming the design of portable power supplies to levels almost like those of utility power.  The core supply voltage of the CPU must remain within its specified tolerance even when the processor performs a current-load step from nearly 0 to more than 60A in a few microseconds.  This process requires a proper design approach and knowledge of advanced power__ Circuit Design by Angel Gentchev, PhD, Analog Devices

Digital Analog Converters Are a Bit Analog App Note/ 1055 / Sep-05___ Maxim Integrated

Digital DAC Provides Digital Three-Phase-Waveform Synthesis 08/07/08  EDN-Design Ideas Used in high volume in audio applications, a low-cost stereo DAC can generate three-phase AC waveforms in high precision__ Circuit Design by SA González, Universidad de Mar de Plata, Argentina, and R García-Gil, J Castelló, and JM Espí,Universidad de Valencia, Spain

Digital to Analogue Converters for PC Parallel Port JDAC and CENT_DAC are both simple Digital to Analogue converter to use with your IBM PC/AT or compatible.  Those circuit are connected to Centronics parallel port and does not affect the normal port usage in any way.  The circuits are transparent to computer, so it is not possible to program to see if those devices are connected or not. __ Designed by Tomi Engdahl

Double DAC rate by using mixers as switches 5-Feb-04 EDN-Design Ideas You can effectively double the sample rate of a DAC by interleaving two DACs into a single unit.  Updating each DAC on an alternating basis and switching to the appropriate output double the effective throughput of the overall system.  It is essential to overall performance that you use a high-quality, high-speed switch in the multiplexing of the DACs' outputs__ Circuit Design by Randall Carver, Analog Devices, Greensboro, NC

DPPs make nonvolatile microvolt DAC 31-Oct-02 EDN-Design Ideas The availability of a seemingly limitless variety of monolithic DAC chips makes it easy to implement most digital-to-analog-conversion applications with a single off-the-shelf device.  Sometimes, an unusual set of requirements necessitates a multichip approach, however.  One example of such a requirement is the need for nonvolatility of the DAC's setting in power-up and -down cycles__ Circuit Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC

DSP chip yields high-speed D/A conversion EDN-Design Ideas 09/01/95    Fig 1 shows an interface circuit you can use for high-speed D/A conversion, using the serial port in the 50-MHz TMS320C25-50 DSP chip.  An AD7568 12-bit DAC provIdeas eight output channels and a serial input.  You can interface the serial input to the TMS320C25 with a minimal amount of additional logic circuitry.__ Circuit Design by James Hiller, Xactex Corp  Kennewick, WA/

Dual, Voltage Output DAC Consumes Miniscule Power App Note/ 111 / Jan-06___ Maxim Integrated


Digital to Analog Circuits:      #'s - B      C - D        E - O      P - T      U - Z

 


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