Analogue to Digital Converters

Analogue to digital converters (ADCs) are devices that convert analogue input signals into a digital output signal, for example a sound captured from a microphone or light entering a digital camera. These analogue inputs are then converted into a digital signal output as either sound from a speaker or a picture in a camera.

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.

Applications

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. 252-1587
Mfr. Part No.ADS7822U
SGD7.27
Each
units
SAR 1 12-bit 200ksps Pseudo Differential Voltage Surface Mount SOIC 8 ±2LSB Serial (SPI) - 2.7 V, 5 V 4.9 x 3.91 x 1.58mm
RS Stock No. 165-4833
Mfr. Part No.MCP3201-BI/P
BrandMicrochip
SGD3.78
Each (In a Tube of 60)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 872-2452
Mfr. Part No.TC7107CPL
BrandMicrochip
SGD7.676
Each (In a Tube of 10)
units
Dual Slope 1 3.5 digit - Differential, Single Ended Voltage Through Hole PDIP 40 ±1Counts BCD Output - - 53.21 x 14.73 x 4.95mm
RS Stock No. 236-8544
Mfr. Part No.ADS1211U
SGD52.93
Each
units
Delta Sigma 4 24-bit 16ksps Differential, Single Ended Voltage Surface Mount SOIC 24 ±0.002%FSR Serial (SPI) - 5 V 15.4 x 7.52 x 2.35mm
RS Stock No. 162-4132
Mfr. Part No.ADS7805UB
SGD113.18
Each (In a Tube of 20)
units
SAR 1 16-bit 100ksps Single Ended Voltage Surface Mount SOIC 28 ±3LSB Parallel - 5 V 18 x 7.52 x 2.35mm
RS Stock No. 162-6116
Mfr. Part No.ADS1148IPW
SGD13.301
Each (In a Tube of 50)
units
Delta Sigma 8 16-bit 2ksps Differential, Single Ended Voltage Surface Mount TSSOP 28 ±1LSB Serial (SPI) Dual, Single 2.7 to 5.25 V 9.8 x 4.5 x 1.05mm
RS Stock No. 522-9559
Mfr. Part No.AD7582KNZ
SGD122.10
Each
units
SAR 4 12-bit 10ksps Single Ended Voltage Through Hole PDIP 28 - Parallel - - 36.83 x 13.97 x 4.07mm
RS Stock No. 162-5217
Mfr. Part No.PCM1803ADB
SGD5.38
Each (In a Tube of 65)
units
Delta Sigma 2 24 bit 96ksps Single Ended Voltage Surface Mount SSOP 20 - Serial - 5 V 7.2 x 5.3 x 1.95mm
RS Stock No. 758-9910
Mfr. Part No.AD7892ARZ-1
SGD52.48
Each
units
SAR 1 12-bit 500ksps Single Ended Voltage Surface Mount SOIC 24 ±1.5LSB Parallel, Serial Single 5 V 15.6 x 7.6 x 2.35mm
RS Stock No. 660-4409
Mfr. Part No.PCM1803ADB
SGD6.21
Each
units
Delta Sigma 2 24 bit 96ksps Single Ended Voltage Surface Mount SSOP 20 - Serial - 5 V 7.2 x 5.3 x 1.95mm
RS Stock No. 111-2219
Mfr. Part No.AD7819YNZ
SGD10.09
Each (In a Tube of 25)
units
SAR 1 8-bit 200ksps Single Ended Voltage Through Hole PDIP 16 ±0.5LSB Parallel - 3 V, 5 V 20.07 x 6.35 x 3.3mm
RS Stock No. 506-1656
Mfr. Part No.LTC2414CGN#PBF
SGD20.31
Each
units
Delta Sigma 8 24-bit 0.008ksps Differential, Single Ended Voltage Surface Mount SSOP 28 14ppm Vref Serial (SPI) - 3.3 V, 5 V 9.98 x 3.99 x 1.5mm
RS Stock No. 732-1537
Mfr. Part No.ADS1148IPW
SGD15.58
Each
units
Delta Sigma 8 16-bit 2ksps Differential, Single Ended Voltage Surface Mount TSSOP 28 ±1LSB Serial (SPI) Dual, Single 2.7 → 5.25 V 9.8 x 4.5 x 1.05mm
RS Stock No. 412-668
Mfr. Part No.AD7705BRZ
SGD17.87
Each
units
Delta Sigma 2 16-bit 0.5ksps Differential Voltage Surface Mount SOIC W 16 ±0.003%FSR Serial (SPI) - 3 V, 5 V 10.5 x 7.6 x 2.35mm
RS Stock No. 379-2364
Mfr. Part No.MCP3201-BI/P
BrandMicrochip
SGD4.558
Each (In a Pack of 5)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 218-8528
Mfr. Part No.ADS7805UB
SGD101.35
Each
units
SAR 1 16-bit 100ksps Single Ended Voltage Surface Mount SOIC 28 ±3LSB Parallel - 5 V 18 x 7.52 x 2.35mm
RS Stock No. 923-1376
Mfr. Part No.ICL7107CM44Z
SGD7.242
Each (In a Tray of 96)
units
Dual Slope 1 3.5 digit 0.003ksps Differential Voltage Surface Mount MQFP 44 ±1Counts - - - 10.12 x 10.1 x 2.1mm
RS Stock No. 538-7497
Mfr. Part No.AD7671ASTZ
SGD81.04
Each
units
SAR 1 16-bit 1000ksps Single Ended Voltage Surface Mount LQFP 48 ±2.5LSB Serial - 5 V 7 x 7 x 1.4mm
RS Stock No. 709-6588
Mfr. Part No.AD7701ARZ
SGD59.04
Each
units
Delta Sigma 1 16-bit 4ksps Single Ended Voltage Surface Mount SOIC W 20 ±0.003%FSR Serial - - 13 x 7.6 x 2.35mm
RS Stock No. 697-7066
Mfr. Part No.AD7686BRMZ
SGD37.19
Each
units
SAR 1 16-bit 500ksps Pseudo Differential Voltage Surface Mount MSOP 10 ±3LSB Serial (SPI/QSPI/Microwire) - 5 V 3 x 3 x 0.85mm