A DAC is a Digital to Analog Converter.

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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 ...
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2answers
38 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
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3answers
92 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
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1answer
56 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 ...
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2answers
62 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
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2answers
91 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
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3answers
71 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 ...
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2answers
114 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?
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1answer
97 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
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3answers
105 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
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4answers
159 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
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2answers
250 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
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2answers
60 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
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1answer
67 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
62 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?
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0answers
46 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
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2answers
194 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
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3answers
205 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
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1answer
78 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
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2answers
138 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
125 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
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2answers
59 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.
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3answers
77 views

Calibrating the output voltage

I have a device which has a 16 bit D/A converter which through an analog linear circuit generates an output voltage between -1V and 1V. I have 32 of such channels on my device. simulate this ...
4
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1answer
295 views

Why my DAC works without GND and VCC?

This is the most interesting thing I have seen! I have built a DDS that sends data (D0-D7) to a DAC (ADV2175). The design worked fine and I just have a low frequency alias noise (a question here). ...
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2answers
60 views

Inverting shift register [closed]

I am trying to invert the output of a shift register using an open-collector TTL inverter with 33K pull-up resistors. The inverter works fine when input=HIGH, but when the input is LOW, the output is ...
2
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1answer
69 views

Looking for High Speed Parallel DAC IC without data latch

I have designed a FPGA based DDS that creates digital signals between 0-70MHz. Now I want to convert my digital data into analog. As the base frequency is 200MHz, I need a high performance parallel ...
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3answers
401 views

Why should we need DAC ICs?

Please look at the schematic below. This is a very simple resistive adder that works fine with any standard ! (TTL,CMOS,...) or any arbitrary voltage that is fed into it. On the other hand as there is ...
1
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1answer
122 views

Why does digital-to-analog converter become unusable?

I am doing an experiment to build and test a 4-bit Digital to Analog Converter based on an R/2R ladder network. I build the DAC that looks like based on this schematic: This circuit was hooked up ...
0
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1answer
153 views

what's the maximum output voltage of my soundcard?

I have measured the voltage of some files with an oscilloscope, and they max out at 1.2v pk-pk when I set my volume on loudest. However, how can I make sure that's the maximum voltage that's ...
0
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1answer
75 views

How to make desired waveforms by AD5668?

In another thread I asked about making sawtooth wave form via harmonics ( Here ) and someone suggested using AD5668 (octal DAC ). I looked at its datasheet but couldn't understand how it can make a ...
0
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2answers
215 views

Digital Analog Converter chip , pre programmed?

Is there a pre-programmed DAC chip? I don't want to program any DAC, I would like to receive digitized voice data via a transceiver then feed it to a speaker/amp. The data is processed by Arduino Uno ...
1
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1answer
109 views

What topologies are used for ultra-low-power CMOS DACs?

What schematics, topologies or algorithms are suitable for ultra-low-power DAC design? You can assume the following design requirements (they are flexible): Full custom CMOS design (this is not a ...
6
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1answer
385 views

LC filter vs Isolation tranformer for AC coupling of a DAC output

I'm trying to decide between a few choices for coupling the output DAC of a DDS with the rest of my circuit. DDS dac's I'm looking at are typically either single-ended or have complimentary current ...
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2answers
190 views

Cascade DACs to get higher resolution

I got a RAM-DAC with 3 channels and 6 bits for each channel. The device in question seems very straightforward to use with a modern MPU like an AVR. The resolution is a bit low, so I thought about ...
2
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2answers
115 views

What is reference voltage in a D/A converter

When I searched on the internet what I got as an answer for the above question is that the reference voltage means the highest voltage tha D/A can output. But my lecturer at college did a calculation ...
2
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2answers
326 views

What does DAC resolution mean?

I am reading the specs of a DAC (this one), and it says the resolution is 10 bit. Does it mean it can generate 1024 voltage levels at the sample rate which is 12 GSa/s? It sounds pretty surreal. Can ...
4
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3answers
455 views

3.3V DAC output to 50V amplification

I have DAC 3.3V generated narrow square pulses that I need to amplify to 50Vdc. For this purpose an OPA551 single supply opamp works fine, but it's quiescent current of ~7mA @ 50V consumes too much ...
4
votes
1answer
2k views

Efficient way to get multiple analogue voltages out of an Arduino?

I've read in my research that most microcontrollers are not built with DAC outputs as they are expensive to include on silicon chips. Also applications that require analogue outputs typically need a ...
2
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2answers
173 views

Efficient way to get multiple Analogue voltages out of a microcontroller?

I've read in my research that most microcontrollers are not built with DAC outputs as they are expensive to include on silicon chips. Also applications that require analogue outputs typically need a ...
1
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3answers
389 views

Controlling 8-bit DAC Output over I2C— decimal to binary char conversion help

Clarifying my question a bit. We're using a PIC32 board with an MCP4706 8-bit DAC, controlled over I2C. If we write a binary value (e.g. 0b00000100) to the DAC, it outputs as expected. However, ...
0
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2answers
142 views

Why does my oscilloscope get no pulse wave when connected to my DAQ board?

I have created the following LabVIEW GUI to generate a square pulse train waveform: As you move the frequency and pulse width knobs the waveform changes accordingly (pulse width is now 2ms). ...
0
votes
1answer
159 views

Load Cell DAQ via Arduino Mega

Background: I'm working on a project that involves tapping into the load cells of a scale and reading the differential output of the Wheatstone bridge. I need to keep all of the original functionality ...
3
votes
2answers
209 views

How to ensure that a pin never floats

I am making a DAC circuit with uses an AD7541A chip which is going to be connected to another board with a microcontroller on it. Now the AD7541A gets fried if someone turns it on while all the pins ...
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2answers
263 views

I2C with PIC32 and MCP4706 Not Working

We're working on a battery charger for an electric bicycle at the moment, but prototyping with a PIC32MX695F512H kit board and an MCP4706 DAC soldered onto a breakout board, programmed using a ...
0
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2answers
164 views

10-Bit DAC input to one binary output?

I'm a novice when it come to electrical engineering and I may be missing a few key concepts but I'll try my best to respond to questions. I have a "Low Cost 10-Bit Monolothic D/A Converter" (AD561J) ...
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votes
1answer
592 views

DSP with ADC DAC SPDIF IO controlled with Microcontroller via USB

I'm looking for a board to process live music (sub-millisecond latency if possible). I'm thinking of a layout like the following: So there are a few DACs and ADCs, S/PDIF inputs and outputs and a ...
19
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4answers
1k views

Do you recognise this signal?

The story for this signal is the following. I've bought an NAD C 356BEE amplifier with an integrated MDC DAC module. It has optical and USB input. The optical is OK, but if I connect the DAC to my ...
12
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4answers
866 views

What is a one-bit ADC good for?

I have recently heard of the concept of a one-bit ADC, and have seen it implemented in the context of a sort of digital-to-analog converter (oddly enough), and I'm wondering, what is the point? Why ...
0
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1answer
73 views

Voice playback IC

I was looking for cost effective voice playback IC and came up to ISD 1700 series. Another brief datasheet is here. I don't believe with the same footprint and only for 3-4 bucks I can get up to 16 ...
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1answer
64 views

Accuracy of a dac - INL rating how that relates to deviation in mV's

In the datasheets of a dac they talk about the INL error. As I understand this is to do with how much the output of the dac deviates from the output of an ideal DAC. So I was wondering how does that ...