Questions tagged [dac]

A DAC is a Digital to Analog Converter.

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35 views

offset binary from ADC to Decimal

Im trying to read data from ADC with ADC Inteface Im designing with FPGA. The data that coming out from the ADC is offset binary with 12 bits.. looks like that: I want to simulate this results using ...
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3answers
72 views

choosing best n points on sine wave for wave generation

I want to generate a sine wave using DAC+DMA. Currently, I have an example that generates a sine wave using DAC+DMA from an array of 60 points, at 8KHz. I want to be able to increase the frequency up ...
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43 views

DAC Signal Clipped By DC Voltage Source

I'm using a TI F28379D to generate a sinusoidal waveform from a DAC channel. The output of the DAC is shown in Figure 1 with a Vpp of 688mV. This signal is then connected to a resistive network of 1k ...
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37 views

The variation of the DAC output is abnormal

Description of the situation I want to output the data from the ADC to the DAC. I use an ADC from Microchip dsPIC33EV128GM104-E / PT and I am using 12 bits. Microchip MCP4922T-E / ST is used and ...
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1answer
31 views

How to calculate voltage of these nodes

How exactly does one calculate the voltage of the marked nodes and arrive at the numbers in the picture (1.75 and 1.628)? I fail when trying. :( simulate this circuit – Schematic created using ...
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1answer
32 views

DAC specifications to test 14 bit ADC for DC input to ADC [closed]

I want to know, what must be the specifications of a DAC to test the 14-bit ADC where we want to provide the dc input for the ADC testing.
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1answer
43 views

Solid-state relay - Integration in circuit

I have an MCP4921 DAC that is controlled by a Raspberry Pi. Then, I have built a Howland current pump circuit that is able to regulate current depending on the input voltage: Both of these work ...
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2answers
83 views

Origin of a Resolution formula for ADC/DAC

What is the origin for the forumla: \$ R= {1\over2}V_{LSB} ={1\over2}*{V_{inMax}\over2^n-1} \$ Where does the \$ {1\over2} \$ comes from? Shouldn't it be just: \$ R={V_{inMax}\over{2^n-1}}\$ ?
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55 views

Ripple on tens-millivolts sinus waveform

I’m trying to make a DDS to generate a sinusoidal signal with tens to hundreds of millivolt amplitude and hundreds kHz frequency using an LTC1666 DAC. But I have some confusing results. Device ...
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1answer
70 views

Arduino based digital to AC conversion schematic

I am trying to build an Arduino based system for sending electric pulses, of 24V, 40mA sinusoidal. Each pulse is in a burst of 5000 microsecond, and each pulse is about 20 - 800 microsecond. These ...
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26 views

How should I model differential non linearity (DNL) of a DAC?

I have very little experience with electronic instrumentation, and I'm learning about INL/DNL. I'm looking at the specifications for a DAC, and the sheet claims a guaranteed DNL of -1 to 1 LSB. ...
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2answers
87 views

Ways to multiplex the output of a DAC?

Part searching in microcontrollers, it looks like most small ones have at most one DAC. What is the just way or ways to output multiple slow signals from a microcontroller with at most a single DAC? ...
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38 views

Voltage DAC, overcome settling time in a corner case

I need a (relatively) cheap DAC to produce a ramp voltage with a update rate of ~1uS per step. Since fully specified 1uS settling voltage DACs are quite expensive, I investigate the possibility to ...
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0answers
48 views

Why Do Pipeline ADCs have an “Overlap Bit”?

In pipeline ADCs, there is an amplifier after each stage that amplifiers the remainder of the previous stage by 2^(number of previous stage bits - 1). For example, if the flash ADC in the first stage ...
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3answers
250 views

How Can the Quantization Noise of an ADC be Measured using the Digital Output?

The ADC quantization noise is the error signal generated by rounding the sampled analog values of signal. Suppose that we have the digital output of an ADC, how can we measure the quantization noise, ...
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2answers
67 views

How to make a sawtooth waveform look less like a staircase (DAC)?

I am making a 4-bit digital-analogue converter using an adder circuit with four inputs. Each input is a square wave of a specific frequency. The output of the DAC is meant to be a sawtooth waveform ...
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1answer
50 views

DAC controlled LDO as current source - Pt.2

This is a follow-up question which references to "DAC controlled LDO as current source.". I am now trying to use the recommended LTC6363-0.5 as seen in the schematics. This is a fully differential OP ...
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2answers
78 views

16 bit R2R DAC?

I want to build a 16 bit R2R DAC using two 74HC595 chip. I need the DAC to replace the potentiometer of a lab PSU. While researching, in the forums and basically everywhere they suggested that R2R ...
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2answers
75 views

Getting 12Amps of 0-12VDC from relatively low frequency PWM

I am trying to drive 4 parallel TEC elements. (TEC1-12706) I intend to run them together up to 12A (or 3A each.) I am using an ATMega328p (in the form of an Arduino Uno Board) to control the system, ...
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2answers
101 views

Fine, coarse adjustment digitally

I want to add fine and coarse adjustment to a power supply for both voltage and current control, for fine tuning I'll need four potentiometers either 10 turn or regular ones. I was thinking to trim ...
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2answers
1k views

Is this how a R-2R DAC for VGA should work?

I'm trying to wrap my head around if this is how a R-2R DAC should work. I say should for two reasons: (1) because I think I understand the theory behind the resistor ladder of subsequent voltage-...
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2answers
72 views

How to generate a sound has 32bit resolution and 96kHz sampling rate [closed]

I'am looking for a mcu which has enhanced DAC performance to generate a sound which has some features (32bit BD / 96kHz SR) but i couldn't cause of bitdept. Are there any mcu which are capable to do ...
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1answer
73 views

Hacking ATM with its aux port [closed]

(I opened a topic about it a few minutes ago but I thought it would be better if I ask my question more properly.) I wonder if is it possible to hacking an ATM (through it's aux port) with connecting ...
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2answers
62 views

How to remove/trim MCP4725 DAC offset? [duplicate]

I'm using MCP4725 (datasheet) module, VCC is connected to a 4096V reference voltage. there's a steady 23mV offset: 0 - 23mV 50 - 73mV 100 - 123mV ... How can I ...
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2answers
116 views

DAC controlled LDO as current source

Currently I use a LT3083 as a constant current source more or less according to the datasheet as given in the first image. Instead of a single set resistor however is use a fixed resistor in series ...
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0answers
51 views

Amplify DAC output

I am using a STM32L053 to generate a sin wave with the DAC output. The voltage range is from 0V - 3.3V with a frequency of 40kHz. Because i have to run the Piezo with a higher voltage, i need to ...
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30 views

Impedance Matching required at Output of RF sampling DAC?

I am designing a schematic with TI DAC38RF80. This DAC is having integrated balun and gives single ended output voltage upto frequencies 4.5GHz. Output power of this DAC is less as shown below: In ...
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1answer
70 views

STM32 DAC Trigger

I am Trying to use the DAC output on my STM32L053R8 NUCLEO Board. I generate the corresponding Sin-Wave values to set the DAC Values like this. ...
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1answer
41 views

TI PCM51xx DAC Charge Pump Failure

I'm using a PCM5122 and previously a PCM5102 (this is the same part, but without the I2C/SPI interface) in my design and I've had a couple of prototypes end up with the 3.3v rail shorted to ground. A ...
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3answers
68 views

External 0~10v controlled by a MCU

Newbie question : I have an external power supply which gives me 10volts reference. The machine I need to command is reading an analog order from 0V (minimum speed) to 10V (maximum speed) and I use a ...
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3answers
97 views

Convert 1kHz PWM signal to 0-10V DC with minimal ripple [closed]

For my application, I want to control the position of a valve which takes 0-10V input voltage. For the determination of the position I need to use a digitial 5V 1kHz PWM signal from an Arduino Nano. ...
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28 views

Could not generate linear output analog voltage using MCP4921

simulate this circuit – Schematic created using CircuitLab I am using MCP4921's output voltage as a control input to vary the analogue SMPS output voltage. I am able to establish successful SPI ...
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0answers
19 views

TI DAC9881 Power-Up Sequencing

I am putting together a design with TI's DAC9881 and using an Arduino based setup to control it. http://www.ti.com/lit/ds/symlink/dac9881.pdf I want to run the design off of single supply (5V) and ...
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1answer
54 views

Is it possible to provide DAC voltage to VOUT_ADJ to control Vout?

I am using a TPS61391 booster. I need to adjust Vout via a DAC connected to FB pin voltage divider (VOUT_ADJ). is this possible? DAC voltage varies from 0 to 3.3V.
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1answer
32 views

MCP4725 DAC and reference volatge

MCP4725 has internal reference voltage which is equals to VCC: VDD is the power supply pin for the device. The voltage at the VDD pin is used as the supply input as well as the DAC reference ...
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1answer
138 views

8-bit VGA DAC Design Question

I am being driven up the wall with designing an 8-bit VGA DAC for an embedded application. Everywhere I've researched highlights the necessity for "impedance matching" the 75 ohm termination ...
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4answers
1k views

Basic Op Amp Question

I am trying to use a LA6500 to increase the current output from my MCP4725 that I am controlling with a raspberry pi. I have Pin1 attached to the output of my DAC pins 2&3 are connected to my pi's ...
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1answer
52 views

One voltage reference per DAC or one voltage reference for all DACs?

I have a circuit that requires six 18-bit DACs (AD5680) on it. Each DAC draws ~800µA at the high voltage output +5V and ~400µA at 0V output. Is there any issue with a single REF195 voltage reference ...
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2answers
74 views

Increasing the opamp gain is decreasing the DAC resolution

I want to control for example LM317 ADJ pin with a 12 bit DAC to get 1mV precision, it's an 0-5V DAC. In below schematic I increased the gain of opamp to two so I can achieve a higher voltage, but now ...
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1answer
65 views

How can I easily inject a tone from a DAC into an XLR audio signal?

Let's say I have a mic-level signal running on an XLR cable - a vocal microphone going to a mixer or preamp. I'm looking for the simplest way to add another mono audio signal to the line. I've got a ...
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1answer
92 views

SAR ADC DAC Question

Hi, This is an extract from MT-021 from Analog Devices about SAR ADCs. In particular, it shows a circuit in which the Track(Sample) and Hold block of the SAR architecture AND the DAC of the SAR ...
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1answer
59 views

String DAC - Question

I was reading about String DACs here https://www.allaboutcircuits.com/technical-articles/voltage-mode-r2r-dacs-operation-and-characteristics/ and I saw Is the highlighed wrong? I mean, if just SW4 ...
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2answers
111 views

Output 0..5 voltage controlled by PC

A piece of lab equipment (an image intensifier) is controlled by voltage in the range of 0..5V (current is expected to be in the range of 10 mA; desired resolution is around 12 bits; no frequency ...
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1answer
81 views

True zero offset current DAC

Is there a current DAC which has 0 current (< 1 nA) for an input code of 0? I am driving an LED, so would it make sense to use bipolar supply rails (where a negative output would reverse bias the ...
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1answer
140 views

KiCad Saying Pins Not-connected

So I am fairly new to using KiCad, and I have encountered a problem. I recently learned how to make hierarchical pins for bus assignments with the notation. ...
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0answers
83 views

DAC7760 voltage and current output

I use the following function to send data from STM32f1 to a DAC7760: ...
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1answer
56 views

Control of large number of analog devices

For research that I work on we have photonic chips that have 100-200 analog devices on board. I wish to control these devices at a rate of ~-1 MHz from an fpga. Some require a current source and ...
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2answers
282 views

Need to map 0-5V DAC output to 0-10V output

I am using a TLV5618 to take a 16 bit SPI package to produce a voltage between 0-5V with 12 bits of resolution (4 control bits). Now I need to shift this signals from 0-5v to a 0-10v signal. I do ...
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2answers
224 views

Increasing output current of DAC

I have an application where my Arduino is controlling a mcp4725 DAC for a design replacing a sensor on an old car. The DAC provides the analog output voltage, .25V to 4.9V to the computer. I recently ...
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1answer
113 views

H-bridge, LED driver, DAC

I am trying to interface a circuit with an FPGA. There is an H-bridge in the circuit that is driving me crazy. The inverted RED and IR signals are coming from FPGA. The light intensity signals are ...

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