A DAC is a Digital to Analog Converter.

learn more… | top users | synonyms

1
vote
0answers
27 views

Problem with DAC with current mirrors

I'm trying to design curent steering DAC with binary weighted inputs - I'm using M4, M5, M6, M7 to copy the reference current flowing in M8 with coefficients of 1,2,4,8. The idea is to put either 0 or ...
2
votes
2answers
61 views

ENOB Calculations

I've been having a discussion with a colleague about ENOB (effective number of bits) calculations for DACs and ADCs. We both come across it from different directions (he being more analog, and me ...
0
votes
1answer
22 views

Harmonic distortion and Nyquist rate (Spurs above the Nyquist rate of a DAC)

I have been reading an article during the past few days for a project I am doing and I've come across a point that bugs me out. It is about improving the spurious free dynamic range (SFDR) of DACs. ...
0
votes
0answers
41 views

What could be the potential reasons for an unstable DAC output like this?

I am simply using a DAC and trying to generate a DC voltage with it. However, the output is unstable from time to time, with very strange diagram on the scope. The diagram is as below. Could I ask ...
-1
votes
3answers
120 views

How do I amplify voltage from a DAC?

How do I do I output an analog signal from 0V - 10.67V using a DAC and provide a Vcc of 5Vdc that can supply at least 3.5 Amps to the rest of my circuit? I am trying to make a circuit that outputs a ...
0
votes
1answer
48 views

Low pass filter value for DAC

I was wondering, how to calculate the values needed for LC/RC filter when using it for digital to analog conversion? Also, how does the square waves frequency affect DAC ? For example: lets say I ...
1
vote
3answers
75 views

DAC but what load?

I want to control a hydraulic valve which accepts a variable voltage from 0V to 12V. That's easy enough with a DAC, but I'm not sure what load I can drive with a DAC. Unfortunately it's not easy ...
1
vote
2answers
121 views

Are all USB “audio adapters” DAC's? Can USB ports be used for analog output?

Kind of a weird question.. Background: My motherboard has started producing weird static(buzzing) noises on the audio output(3.5mm jack), it's not noticeable when using headphones, but on speakers it ...
4
votes
2answers
105 views

Isolating an analogue input using ADC/DAC

I'm looking into isolating an analogue input coming from field equipment and interfacing to a PLC analogue input module. The input will be of the 4-20mA range (1-5V). There are a few ways to approach ...
1
vote
1answer
46 views

LPC11C24 MCU to control DAC8718

I am trying to use an LPC11C24 microcontroller to send digital values to a DAC8718 to convert to an analog voltage value. I am attempting to communicate via SPI and I am using ...
1
vote
2answers
128 views

Analog and Digital Grounds on a DAC

I've read at several places (1,2) that ICs such a DAC have both analog and digital ground pins, both should be tied to AGND at the chip. However, the specific part I'm planning to use (MAX5104) does ...
3
votes
1answer
92 views

Arduino audio output via R-2R DAC - biasing output for piezo speaker

I followed a tutorial on 8-bic DACs using an R-2R resistor ladder. I am outputting a sine-wave using data from 0 to 255 on pins 0-7. This goes through the pins into the R-2R DAC producing an analogue ...
0
votes
1answer
90 views

Micro Converter with ADC/DAC peripherals

I bumped into an interesting device ADuC841. It seems to be a microcontroller with extensive ADC/DAC peripherals. Since I am not experienced and did not have to use combination of ADCs and DACs, going ...
2
votes
0answers
57 views

Troubleshooting audio output on Nexys 2 (FPGA)

I've recently purchased the PMOD AMP1 module from digilent for use with my Nexys 2. When I program the demo project and plug headphones or speakers on the headphone output I can hear a barely ...
4
votes
2answers
166 views

Stuck codes in samples from ADC

I am currently testing a 16-bit DAC and a 18-bit ADC. In many tests I have found the ADC to get "stuck" at codes, especially at the ends of the input range. Both the DAC and ADC operate in bipolar ...
0
votes
0answers
25 views

I2S - Choosing the right SCK frequncy for a DAC

I'm currently working with a DIR9001 SPIDF reciever, which takes a SPIDF signal and converts it into I2S (for feeding into a DAC). The datasheet gives me a bunch of options for selecting the system ...
1
vote
1answer
84 views

Weird samples from SAR ADC

I am playing around with some SAR (Successive Approximation) A/D-converters. I have made a test circuit where I have a 16-bit DAC from Texas Instruments (R2R-based) and an 16-bit SAR ADC from Analog ...
1
vote
1answer
56 views

Interfacing a serial DAC

I am trying to make a use of AD5612 DAC. It has a serial interface and I can not fully understand how to properly drive it. Given that I will be using only one DAC in normal operating mode with ADDR ...
5
votes
1answer
22 views

ADuC812 needs DAC value written twice. Is that normal/common?

A while ago I had a project that involved Analog Devices ADuC812 microconverter. Amongst assorted on-board hardware, the device had two very helpful DAC converters, that could source 0-5V on their ...
3
votes
1answer
82 views

Delta Sigma DAC-like switching of a mains AC load

I'm helping out in a project to convert an electric rice cooker into a sous vide cooker with a PID control. For those unaware, this is a precision-controlled water bath at "low" temperatures (setpoint ...
0
votes
1answer
84 views

Further to PWM DAC Explanation

Refer to this question I had asked a few days back: PWM DAC Filter explanation Hi, It is getting extremely difficult for me to create the PT0 and PT1 signals as given above. I am using a dsPIC30F ...
0
votes
1answer
115 views

Can't get transistor to work correctly as a switch

What I'm trying to achieve: I have a 5V PWM signal that either needs to be left as-is, or converted into an analog 0-5V signal. How am I planning to achieve this? The PWM to analog conversion is ...
5
votes
1answer
159 views

PWM DAC Filter explanation

I found this design idea (Fast-settling-synchronous-PWM-DAC-filter-has-almost-no-ripple) on EDN where an RC integrator and a sample/hold amplifier are used to filter PWM signals into stable DC values. ...
1
vote
1answer
97 views

Up/down counter? [closed]

I'm constructing an DAC device using R-2R resistor ladder network. But I don't understand what is the purpose of using the up/down counter in the device. For this device i use the CD4516 counter I am ...
0
votes
4answers
187 views

Controlling an Op-amp gain using an MCU && || DAC?

I'm building a circuit that will generate various wave forms. The output from the circuit is fed to a summing amplified where positive or negative dc offset is being added. This signal should be ...
0
votes
3answers
251 views

PIC12 DAC has no output

I have a PIC12F1571 (datasheet here: http://ww1.microchip.com/downloads/en/DeviceDoc/40001723b.pdf) that I have programmed to read an analog input, do some processing on the value read and then ouput ...
0
votes
0answers
42 views

Aes/Ebu to Analog Converter IC

I will convert AES/EBU to analog, then monitor it and will convert it again to AES/EBU. Do you have any advice to convert AES/EBU to analog IC and analog to AES/EBU IC.
0
votes
0answers
64 views

Analog output using a current-output DAC and resistors

Does it make sense to have a 4-20mA output DAC and use a precision (~1%) load resistor to convert this to a voltage output with the goal of having a selectable current/voltage analog output? For ...
2
votes
1answer
82 views

What are these components in block diagram of STM32?

Today, when I was seeing in STM32F103RET6 datasheet I saw some odd things(also, they are odd for me, probably you have enough information about these). if look in 12P of datasheet, you will see this ...
0
votes
2answers
95 views

A simple digital current sink for a fuel gauge?

I need to simulate a 1200Ω fuel sender with an arduino, so I can control the fuel gauge. The fuel gauge has one wire which it supplies with an unknown current and voltage, where the voltage is no ...
1
vote
3answers
170 views

Sawtooth waveform using DAC

I am trying to create a sawtooth waveform using microcontroller/counter and DAC. Instead of getting a nice smooth ramp, I am getting a ramp but with impulses and other noise. I am using AD7533 DAC and ...
1
vote
1answer
92 views

Can I connect an ADC directly to a DAC?

I'm planning to do some audio DSP soon but I would like to know if I can connect an ADC directly to a DAC without a processor in the chain. My main reason is to test preamp circuitry. I would like ...
1
vote
2answers
95 views

Play PCM stored in EEPROM without microcontroller

Is it possible to connect digital-to-audio converter with a EEPROM storing PCM data to play that data with a speaker? I am interested in a solution that does not employ any kind of microcontroller. ...
0
votes
2answers
468 views

Interference on ADC reading (STM32F4)

I'm using the ADC of a STM32F4DISCOVERY to sample a signal. The sampled values are directly written to the DAC. I tested this and it worked absolutely fine, just as I would expect. Now I wanted to ...
2
votes
3answers
157 views

Audio PWM DAC filtering

I have an msp430 synth project and can't decide on the output: I get an 8 bit ~45kHz PWM output out of the chip which I'd like to use as an audio signal, but I am unsure whether I can just stick ...
1
vote
2answers
191 views

4-20mA output/transmitter? [closed]

I've got an MCU with a 3.3V DAC onboard and I'd like to convert the 0-3.3V signal to a 4-20mA output. Any ideas on how to do this?
1
vote
1answer
135 views

Construct a post-equalizing circuit to compensate imperfect of the DAC

The post equalizing circuit is shown on above. How do I determine the value of the capacitance? I couldn't find any equation to determine it. It have been advised to use LT6202 to construct it, ...
2
votes
3answers
166 views

why the quantised of DAC will affect the amplitude of the output waveform of AD 9850?

By referring to the http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf, for page 9 and figure 5, why the quantized D/A converter affect the amplitude of the output waveform?
2
votes
4answers
896 views

Convert a PWM to analogue with double the voltage range?

I have a PWM output (0-5v) that I need to convert to an analogue voltage. Simple = RC filter. However, the voltage range from that analogue voltage needs to be twice that of the input voltage, and I'm ...
0
votes
2answers
1k views

linear-control 12V DC fan with 5V low-current (Arduino)

I am trying to control a 12V DC computer fan ... without PWM for longer life and less high-frequency sound emitting Controlled by 5V positive voltage coming from the arduino after a DAC Using a ...
0
votes
2answers
100 views

Digital-to-analog conversion of a product of digital inputs

If we have a 4-bit DAC, which converts a 4-bit binary signal \$ X = X_3 X_2 X_1 X_0\$ to an analog signal \$Y=X/2\$ (i.e. 1010 -> = 5 V, or 0111 -> 3.5 V). How can we create a DAC, using any number ...
0
votes
1answer
97 views

High Current Many-Channel DAC [closed]

I've been looking at DACs on Digikey and other electronics sites in hopes of finding a circuit to drive > 20 electrical nodes with ~10 mA per channel, 0->8V, with ~16-bit precision. I've seen ...
0
votes
1answer
71 views

Digital to Analog Converter math question

I'm having a hard time understanding how to calculate this. I'm getting an answer of 3.33K which is not listed in the answers. Am I doing something wrong here or is the answer not given?
1
vote
0answers
54 views

How multiple sounds together is sampled and reproduced? [closed]

I searched and understood up to the point that device samples the input at frequent interval and store that digitally and later that can retrieved and recreated that sampled sound. What I am not able ...
0
votes
2answers
368 views

DAC to run a 555 Timer [duplicate]

I am trying to create a PWM signal using a POT from 555 Timer to control speed of a 5V DC motor. I have a development board with a C8051F020 microcontroller, a 100K POT and an LCD display. The ...
5
votes
3answers
289 views

How do sound cards cope with negative voltage?

I feel this is a basic question but I found no answer for it so far. Let's take a random sound card that lives within a PC. From the connections at the end of the datasheet I assume that it is ...
2
votes
1answer
108 views

Help me find DAC Output function

Please help me find the output function, with \$V_{REF}\$ as reference, and \$b_5-b_0\$ as the digital input for this circuit (1): I'm kinda confused with this Series capacitor that's splitting the ...
2
votes
2answers
157 views

Amplifier circuit doesn't work (what am I doing wrong?)

I'm trying to amplify a 0-5V DC signal (created bij a DAC) to a high voltage signal. I'm trying to do this via a Class A amplifying circuit (as advised by others before). For one reason or the other ...
2
votes
1answer
220 views

Making a pure R-2R resistor ladder DAC with adjustable offset

I'm looking to make a DAC for my Arduino so that I can generate values spanning almost completely from 0V to the 5V supply. Because I won't have access to any +12V or -12V rails or anything, I'm ...
0
votes
2answers
70 views

D/A converter with 0.4 up to 4V voltage output

I have this circuit: I want to have as output: BCD Voltage 0 0.4V 1 0.8V . . 9 4V My circuit actually doesn't work correctly.