Analogue to Digital Converters

Analogue to digital converters (ADCs) are devices that convert input analogue signals into a digital such output as a sound captured from a microphone or light entering a digital camera, into a digital signal.

ADCs sample the input signals at specific points in time which reduces the allowable bandwidth of the input signal for increased efficiency.

What does an analogue to digital converter do?

Audio analogue to digital converters captures and converts analogue sounds into digital signals using a mathematical function called quantisation. This conversion occurs periodically instead of continuing to minimise noise generation.

Video analogue to digital to converters are a high-frequency low- to medium-resolution type that is used to convert analogue video data into digital video signals such as displays on digital cameras.

General Purpose ADCs are considered the base type of ADC un of the mill ADCs are used to convert analogue signals to digital signals in equipment such as temperature sensors.

Types of analogue to digital converters

The most widely used types of ADCs are;

  • Flash – Flash ADCs are considered the fastest way to convert an analogue signal to a digital signal and are suitable for applications requiring very large bandwidths such as satellite communication, data acquisition, radar processing and sampling oscilloscopes.
  • Successive approximation – A successive approximation ADC converts continuous analogue waveform into digital using a binary search through all quantization levels before finally combining a digital output for each conversion.
  • Sigma-delta – Sigma delta ADCs converts the signal by large factors and filters the desired signal. They offer high resolution, low power consumption and are used in applications such as process control, temperature measurement and weight measurement scale devices.


Audio ADCs are widely used in applications such as;

  • Professional audio mixing consoles
  • Home theatre systems
  • Musical instruments

Video ADCs are used in;

  • Medical Imaging
  • Digital Instrumentation
  • Digital cameras

General Purpose ADCs are used primarily in applications such as;

  • Battery Operated Systems
  • Sensor Interfaces
  • Frequency measurement

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Description Price Architecture Number of ADCs Resolution Sampling Rate Input Signal Type Input Type Mounting Type Package Type Pin Count Integral Nonlinearity Error Digital Interface Type Power Supply Type Typical Single Supply Voltage Dimensions
RS Stock No. 538-5312
Mfr. Part No.AD7667ASTZ
SAR 1 16-bit 1000ksps Pseudo Differential Voltage Surface Mount LQFP 48 ±2LSB Serial - 5 V 7 x 7 x 1.4mm
RS Stock No. 708-9527
Mfr. Part No.AD7622BSTZ
SAR 1 16-bit 2Msps Differential Voltage Surface Mount LQFP 48 ±1.5LSB Parallel, Serial Single 2.7 V 7 x 7 x 1.45mm
RS Stock No. 162-6112
Mfr. Part No.ADS1014IDGST
Each (On a Reel of 250)
Delta Sigma 1 12-bit 3.3ksps Differential, Single Ended Voltage Surface Mount VSSOP 10 0.5LSB Serial (I2C) - 3.3 V 3 x 3 x 1.02mm
RS Stock No. 889-5950
Mfr. Part No.MCP3424-E/ST
Each (In a Tube of 96)
Delta Sigma 4 18-bit 0.004ksps Differential, Single Ended Voltage Surface Mount TSSOP 14 35ppm FSR Serial (I2C) - 5 V 5 x 4.4 x 0.9mm
RS Stock No. 697-7041
Mfr. Part No.AD7418ARMZ
SAR 1 10-bit - Single Ended Voltage Surface Mount MSOP 8 ±1LSB Serial (I2C) - 3.3 V, 5 V 3 x 3 x 0.85mm
RS Stock No. 889-5948
Mfr. Part No.MCP3428-E/SL
Each (In a Tube of 57)
Delta Sigma 4 16-bit 0.015ksps Differential Voltage Surface Mount SOIC 14 10ppm FSR Serial (I2C) Single 2.7 to 5.5 V 8.65 x 3.9 x 1.25mm