A DAC is a Digital to Analog Converter.

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Looking for a way to output 100-144 Analog Channels from Arduino [on hold]

I've been searching for days and found 2 ways that could work, but not sure about implementation: Using shift registers like in: ...
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3answers
59 views

Problem : Cmos Circuit

I got a problem related the circuit below. I wanted to make DAC (0-80V) using a pwm input (6 kHz). You might ask why I did not make it with a single n-mos. The reason for it, I used a single as ...
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18 views

DAC via I2C: detect error conditions

We are using a MAX517 DAC-device as slave and an ATmega8535 controller as master. Communication errors can be readily detected by comparing (TWSR & 0xF8) with 0x08 for Start, 0x18 for address ...
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2answers
58 views

is there any analog voltage reading ic present? [closed]

In arduino analogRead() reads voltage from 0 to 5 v and gives 10 bit output. Is there any IC which is specialized for this function only?
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2answers
190 views

Straight from the datasheet: Is this really a sensible filter circuit?

Cirrus Logic CS42426-CQZ is an audio CODEC that I want to use in a custom USB sound card. You can download the datasheet from there. On page 61, the datasheet has a recommended circuit for each A/D ...
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1answer
74 views

Replace an Analog Pot with a digital one?

I have a Boost converter with a constant current mode that allows me power a high power led (Vf 34, 3A). I'd like to be able to control the current potentiometer on this device with an arduino. To do ...
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27 views

Compute analog signals as functions of two signals

I would like to hear your opinion with respect to the following architecture for a supposedly easy task. I need to “compute” the value of two voltages depending on two signals. Details: I need to ...
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3answers
81 views

Joystick interface

I need some advice for my project. I would like to create a joystick interface for my old Amiga computer. I have an analog joy with HID USB interface, I can read the position datas in digital format. ...
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1answer
128 views

Need help with a R-2R DAC Circuit

I am trying to simulate a 4-bit DAC circuit using a R-2R resistor ladder. I am using a 741 op-amp. I selected the R value as 10k and calculated the value of Rf using the equation given on this page - ...
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42 views

Calculating resistor values in R 2R derived circuit?

I am designing an audio effect to try to create that digital lo-fi effect, by using 2 quad op amps in a flash ADC configuration and then doing a R 2R DAC on it. Since I do not want to use no ...
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1answer
63 views

How does an speaker amplifier have to be build for a given DAC output signal?

I am working on a project "cat projector" which shall "shout" at the cat when she jumps on the table in the living room. For the logic I use an Arduino board which plays/streams the sound at 22.1kHz ...
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468 views

Which Amplifier Should I Use After my DAC (what are I am doing wrong)?

I am working on a project "cat projector" which shall "shout" at the cat when she jumps on the table in the living room. For the logic I use an Arduino board which plays/streams the sound at 22.1kHz ...
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2answers
89 views

Converting mark space ratio to DC

I have a pulse which varies between 500 Hz to 100 kHz where the quantity I need is the mark space ratio, I'm not interested in the frequency here although it must affect the design. What I've come up ...
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2answers
84 views

Raspberry Pi and TLC5615 DAC

Currently I'm working in a project in which I need to programmatically control 2 currents from 0 to 1 Amp. My plan is to use two DACs controlled by a Raspberry Pi. My idea was to use the MCP4725 but ...
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63 views

Current steering DAC

I want to design current steering DAC with current mirror sources binary weighted and an op amp to convert the current from the current sources to voltage corresponding to the input current. I find ...
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38 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 ...
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2answers
149 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 ...
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1answer
26 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. ...
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51 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 ...
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255 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 ...
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1answer
121 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 ...
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3answers
85 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 ...
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2answers
208 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 ...
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175 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 ...
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1answer
94 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 ...
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229 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 ...
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160 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 ...
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1answer
112 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 ...
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83 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 ...
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2answers
216 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 ...
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45 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 ...
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1answer
156 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 ...
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65 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 ...
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31 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 ...
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1answer
92 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 ...
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1answer
117 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 ...
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1answer
147 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 ...
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2answers
243 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. ...
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1answer
131 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 ...
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4answers
330 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 ...
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3answers
464 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 ...
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67 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.
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93 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 ...
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1answer
96 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 ...
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2answers
123 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 ...
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3answers
214 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 ...
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103 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
119 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. ...
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2answers
707 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 ...
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3answers
230 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 ...