DAC (Digital-to-Analog Converter)

Product Specifications

Technical details and manufacturing context for DAC (Digital-to-Analog Converter)

Definition

A digital-to-analog converter (DAC) is an electronic component that transforms discrete digital binary data into a continuous analog voltage or current signal. It is a critical building block in microprocessor-based control systems and PID controller integrated circuits, enabling digital systems to interface with and control analog devices and processes. The DAC accepts a digital code, typically a binary number, and produces an output voltage or current proportional to that code. The precision of this conversion is determined by the resolution (number of bits) and the reference voltage. Higher resolution allows finer steps in the analog output, while the reference voltage sets the full-scale range. Common conversion techniques include resistor ladder networks (such as R-2R ladders), pulse-width modulation (PWM) followed by filtering, and sigma-delta modulation. The choice of technique affects speed, accuracy, and cost. DACs are used in a wide range of applications, including audio equipment, motor control, process control, and instrumentation. They are available in various package types and configurations to suit different integration levels. This directory entry provides typical parameter ranges for industrial-grade DACs, such as resolution from 8 to 24 bits, sampling rates from 100 to 1000 kSPS, and output voltage ranges of 0–5 V or current loops of 4–20 mA. It also lists common specifications like integral and differential nonlinearity, supply voltage, power consumption, operating temperature, and ingress protection. These values are reference ranges and must be verified with the manufacturer for a specific model. Standards such as IEC 60068-2-1/2 for temperature testing and IEC 60529 for ingress protection are mentioned as verification references, not as certifications of any particular product.

Working Principle

A DAC converts discrete digital values (binary numbers) into corresponding analog voltage or current levels. It uses techniques such as resistor ladder networks, pulse-width modulation, or sigma-delta modulation. The digital input code selects a specific output level, with the precision determined by the resolution (number of bits) and the reference voltage. For example, an R-2R ladder network uses a network of resistors to generate a weighted sum of voltages. PWM generates a square wave with a duty cycle proportional to the digital value, which is then low-pass filtered to produce a smooth analog signal. Sigma-delta modulation uses oversampling and noise shaping to achieve high resolution. The output is updated at the sampling rate, and the integral and differential nonlinearity indicate deviations from the ideal transfer function.

Common Materials

Silicon semiconductor, Metal interconnects, Dielectric materials

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resolution	8–24 bit	Higher resolution provides finer analog output steps.
Sampling Rate	100–1000 kSPS	Maximum update rate of the analog output.
Output Voltage Range	0–5 V	Unipolar output; bipolar available on request.
Output Current Range	4–20 mA	Standard industrial current loop.
Integral Nonlinearity (INL)	±0.5–±2 LSB	Deviation from ideal transfer function.
Differential Nonlinearity (DNL)	±0.5–±1 LSB	Step size error between adjacent codes.
Supply Voltage	2.7–5.5 V DC	Single supply; dual supply optional.
Power Consumption	0.5–10 mW	At full-scale output and max sampling rate.
Operating Temperature Range	-40–85 °C	Industrial grade; extended range available.IEC 60068-2-1/2
Storage Temperature Range	-55–125 °C	Non-operating condition.IEC 60068-2-1/2
Relative Humidity	5–95 % RH	Non-condensing.IEC 60068-2-78
Ingress Protection (IP) Rating	IP40–IP65	Depends on enclosure and connector options.IEC 60529
Package Type	SOP-8–TSSOP-20	Surface mount; through-hole available.JEDEC MS-012
Weight	0.5–2.0 g	Typical for packaged IC.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Digital Input Register Part
Stores and holds the digital input value during conversion process

Material: Silicon semiconductor
Resistor Network
Generates precise analog voltage levels corresponding to digital inputs

Material: Thin-film resistors
Output Amplifier
Buffers and drives the analog output signal with appropriate current capability

Material: Silicon semiconductor
Low-Pass Filter Optional
Smooths the PWM square wave into the analog level it represents.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Microprocessor / PID Controller IC

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Frequently Asked Questions

What is the typical resolution range for a DAC?

The resolution typically ranges from 8 to 24 bits. Higher resolution provides finer analog output steps, but also requires more precise components and may increase cost. The actual resolution for a specific model must be confirmed with the manufacturer.

What output ranges are available?

Common output voltage ranges are 0–5 V (unipolar) with bipolar options on request. For current output, a standard industrial loop of 4–20 mA is typical. These are reference ranges; the exact output range depends on the model and configuration.

What is the difference between INL and DNL?

Integral Nonlinearity (INL) is the deviation of the actual transfer function from an ideal straight line, measured in LSB. Differential Nonlinearity (DNL) is the error in step size between adjacent digital codes. Both affect the accuracy of the analog output and are specified as ranges such as ±0.5 to ±2 LSB for INL and ±0.5 to ±1 LSB for DNL.

What standards are relevant for environmental testing?

The operating and storage temperature ranges are referenced to IEC 60068-2-1/2, and relative humidity to IEC 60068-2-78. Ingress protection is referenced to IEC 60529. These standards are for verification purposes; the actual compliance of a specific product must be confirmed with the manufacturer.

Data Basis

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Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Resolution: 8-bit to 24-bit, Sampling Rate: up to 10 GSPS, Power Supply: 1.8V to 5V
temperature:	-40°C to +85°C (industrial grade), -55°C to +125°C (military grade)

Product Specifications

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Application Fit & Sizing Matrix

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