A DAC is a Digital to Analog Converter.

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PIC microcontroller DAC output incorrect

Using a PIC16F1825 microcontroller I was seeing incorrect values being output on the DACOUT pin. The setup stipulated using the fraction 8/32 * VREF+ where VREF+ was an external 2.5V reference. The ...
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1answer
42 views

How are DACs integrated in color LCD screens?

I'm having trouble imagining what actually happens inside an LCD screen. I picture digital RGB data for each pixel getting sent to the screen through a connector. Lets say we have 24-bit color for ...
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2answers
46 views

Converting Pulses to Analog Input for Mic

A continuation of this question. I am attempting to read two flow meters through the mic port of a phone/tablet. The flow meters' pulse pins toggle between +0V and +5V as their pinwheels rotate. I ...
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56 views

How to interface this circuit with a 0-10v Theatrical Lighting Dimmer

I'm trying to build a circuit which allows an Arduino to control 6 channels of lighting from an old Strand Act 6 Dimmer. These dimmers have 8-pin DIN connector on them like this specification. Pin 7 ...
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1answer
51 views

Clock distribution for low-jitter audio DAC

I am building a 10-channel audio DAC using 10 ES9018 converters and an ultra low phase noise clock (Pulsar) with femtosecond jitter. What would be the best way to distribute the clock's signal to the ...
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4answers
218 views

Counteracting Sound Card AC Coupling for Reading Digital Data

Disclaimer: I am new to EE. Everything I have learned so far I have taught myself from reading online and posting questions like this while working on this project. I apologize if I do a poor job of ...
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1answer
130 views

Why modern oscilloscopes use hardware triggering?

I've been learning how DSOs work for the past few days. As far as I understand, digital storage oscilloscopes have trigger circuitry, which usually consists of an analog comparator and a DAC. A ...
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5answers
292 views

16-bit or 24-bit converters?

I wanna build some DSP effects on, for example STM32F4 processor, with frequency 96 or 192 KHz. Are 16-bit converters (ADC and DAC) enough for that kind of operation? Can I hear a diffrence when ...
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31 views

How to properly ground chassis containing AC/DC switching power supply?

I'm planning to build a Digital Audio Converter as a hobby device and I had some questions regarding safely grounding the chassis. I want to purchase a power supply like this one: MicroMall(TM) ...
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2answers
39 views

Improve DAC Pulse Rise/Fall Time

I have an older NI DAQ (PCI-6251) which comes equip with a bunch of ADC's, two DAC's and a hand full of DIO ports. I need to output a pulse of variable width, amplitude and DC offset which the DAQ ...
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1answer
51 views

Why is USB D+ tied to VDD (for PCM2707 at least)

I'm trying to implement an audio DAC using PCM2707 as a receiver and, looking over a couple schematics of previous implementations - at least one being verified as correct, I noticed D+ being ...
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110 views

Can I adjust the volume of a DAC using PWM?

Here is a circuit that allegedly converts PWM into a precision voltage reference: I am thinking about feeding that reference into the reference line on this MCP4921 DAC. My goal is to generate ...
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1answer
56 views

How to deal with analog pin drivers with output switching?

I'm trying to figure out if there's any way to affordably improve the performance of an analog pin driver that needs to be periodically isolated from its load, for the duration of self-calibration. ...
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1answer
21 views

Texas Instruments Page/Register Convention - how to find the actual register address?

I am having troubles understanding TI datasheets regarding their DACs... I haven't felt so stupid for quite a while! To make things as transparent as possible, here is a very literal question. I am ...
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2answers
63 views

Using DAC to create reference in a wheatstone bridge for strain gauge?

I am designing a circuit where a microcontroller can measure the load forced upon a load cell with strain gauges, making a half bridge. A traditional Wheatstone bridge looks like this: Resistors ...
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0answers
29 views

Best Battery for saving small charge Overtime

Working on a project that requires the use of piezoelectric effect. It is true that the charge per compression can be very small. Trying to figure out what the ...
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1answer
41 views

Connect ground of system A to 1v6 of system B?

I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use ...
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5answers
84 views

Digital circuit for adding multiple frequencies

The goal is to implement a kind of a digital piano on an FPGA. Until now, I managed to produce individual notes using counters. Basically, I generate a square wave of a certain frequency, that ...
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2answers
460 views

Is there any DAC that generates a negative voltage or sine wave without offset?

I would like to generate a positive and negative voltage (sine wave without offset) from an AVR microcontroller. I think it needs an external DAC, because the internal ones are not able to generate a ...
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1answer
60 views

SPI communication not working during Run time?

For my project i need to communicate between Microcontroller C8051f350 Datasheet (Silab Microcontroller) and TI DAC116s997 DataSheet IC through SPI. The problem i am facing a problem in SPI ...
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1answer
92 views

Driving 555 control voltage with DAC

I have build a stepped tone generator (aka Atari Punk console) which are 2 555 timers connected together (one 555 is configured as a astable oscillator and drives the second configured as a monostable ...
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1answer
114 views

Looking for a way to output 100-144 Analog Channels from Arduino

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
87 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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43 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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70 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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216 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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182 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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39 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
157 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
177 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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56 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
86 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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3answers
499 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
111 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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127 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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87 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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45 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
338 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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38 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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56 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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3answers
445 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
180 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
98 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
307 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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2answers
252 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
134 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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2answers
360 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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1answer
199 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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122 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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0answers
100 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 ...