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. 889-5770
Mfr. Part No.MCP3201-CI/P
BrandMicrochip
HK$19.26
Each (In a Tube of 60)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Through Hole PDIP 8 ±2LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 379-2386
Mfr. Part No.MCP3201-CI/P
BrandMicrochip
HK$22.554
Each (In a Pack of 5)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Through Hole PDIP 8 ±2LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 911-5583
Mfr. Part No.MCP3427-E/UN
BrandMicrochip
HK$21.688
Each (In a Tube of 100)
units
Delta Sigma 2 16-bit 0.015ksps Differential Voltage Surface Mount MSOP 10 10ppm FSR Serial (I2C) Single 2.7 to 5.5 V 3 x 3 x 0.95mm
RS Stock No. 165-3428
Mfr. Part No.MCP3221A5T-E/OT
BrandMicrochip
HK$10.485
Each (On a Reel of 3000)
units
SAR 1 12-bit 22.3ksps Single Ended Voltage Surface Mount SOT-23 5 ±2LSB Serial (I2C) - 5 V 3.1 x 1.8 x 1.3mm
RS Stock No. 889-5985
Mfr. Part No.MCP3201-BI/SN
BrandMicrochip
HK$20.373
Each (In a Tube of 100)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Surface Mount SOIC 8 ±1LSB Serial (SPI) - 5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 379-2370
Mfr. Part No.MCP3201-BI/SN
BrandMicrochip
HK$24.748
Each (In a Pack of 5)
units
SAR 1 12-bit 100ksps Pseudo Differential Voltage Surface Mount SOIC 8 ±1LSB Serial (SPI) - 5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 738-6020
Mfr. Part No.MCP3221A5T-E/OT
BrandMicrochip
HK$13.565
Each (In a Pack of 2)
units
SAR 1 12-bit 22.3ksps Single Ended Voltage Surface Mount SOT-23 5 ±2LSB Serial (I2C) - 5 V 3.1 x 1.8 x 1.3mm
RS Stock No. 819-5617
Mfr. Part No.MCP3427T-E/UN
BrandMicrochip
HK$20.213
Each (On a Reel of 2500)
units
Delta Sigma 2 16-bit 328sps Differential, Single Ended Voltage Surface Mount MSOP 10 10ppm FSR Serial (I2C) Single 2.7 to 5.5 V 3 x 3 x 0.95mm
RS Stock No. 703-7949
Mfr. Part No.MCP3427-E/UN
BrandMicrochip
HK$29.34
Each
units
Delta Sigma 2 16-bit 0.015ksps Differential Voltage Surface Mount MSOP 10 10ppm FSR Serial (I2C) Single 2.7 → 5.5 V 3 x 3 x 0.95mm
RS Stock No. 523-8446
Mfr. Part No.AD7705BNZ
HK$107.77
Each
units
Delta Sigma 2 16-bit 0.5ksps Differential Voltage Through Hole PDIP 16 ±0.003%FSR Serial (SPI) - 3 V, 5 V 20.07 x 6.35 x 3.3mm
RS Stock No. 889-5143
Mfr. Part No.MCP3008-I/P
BrandMicrochip
HK$18.996
Each (In a Tube of 30)
units
SAR 8 10-bit 200ksps Pseudo Differential, Single Ended Voltage Through Hole PDIP 16 ±1LSB Serial (SPI) - 5 V 19.05 x 6.35 x 3.3mm
RS Stock No. 639-4200
Mfr. Part No.ADC121S625CIMM/NOPB
HK$50.40
Each (In a Pack of 5)
units
SAR 1 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 8 ±1LSB Serial (SPI) - 5 V 3 x 3 x 0.86mm
RS Stock No. 639-4187
Mfr. Part No.ADC121S021CIMF/NOPB
HK$19.582
Each (In a Pack of 5)
units
SAR 1 12-bit 200ksps Single Ended Voltage Surface Mount SOT-23 6 ±1LSB Serial (SPI) - 3.3 V, 5 V 2.92 x 1.6 x 1.02mm
RS Stock No. 102-5605
Mfr. Part No.ADC121S021CIMF/NOPB
HK$9.583
Each (On a Reel of 1000)
units
SAR 1 12-bit 200ksps Single Ended Voltage Surface Mount SOT-23 6 ±1LSB Serial (SPI) - 3.3 V, 5 V 2.92 x 1.6 x 1.02mm
RS Stock No. 889-5225
Mfr. Part No.MCP3202-CI/SN
BrandMicrochip
HK$16.923
Each (In a Tube of 100)
units
SAR 2 12-bit 100ksps Pseudo Differential, Single Ended Voltage Surface Mount SOIC 8 ±2LSB Serial (SPI) - 3.3 V, 5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 819-5581
Mfr. Part No.MCP3202T-CI/SN
BrandMicrochip
HK$18.155
Each (On a Reel of 3300)
units
SAR 2 12-bit 100ksps Differential, Single Ended Voltage Surface Mount SOIC 8 ±2LSB Serial (SPI) Single 2.7 to 5.5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 669-6064
Mfr. Part No.MCP3008-I/P
BrandMicrochip
HK$21.65
Each (In a Pack of 2)
units
SAR 8 10-bit 200ksps Pseudo Differential, Single Ended Voltage Through Hole PDIP 16 ±1LSB Serial (SPI) - 5 V 19.05 x 6.35 x 3.3mm
RS Stock No. 102-5606
Mfr. Part No.ADC121S625CIMM/NOPB
HK$23.36
Each (On a Reel of 1000)
units
SAR 1 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 8 ±1LSB Serial (SPI) - 5 V 3 x 3 x 0.86mm
RS Stock No. 403-913
Mfr. Part No.MCP3202-CI/SN
BrandMicrochip
HK$23.90
Each (In a Pack of 2)
units
SAR 2 12-bit 100ksps Pseudo Differential, Single Ended Voltage Surface Mount SOIC 8 ±2LSB Serial (SPI) - 3.3 V, 5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 538-4943
Mfr. Part No.AD7787BRMZ
HK$98.29
Each
units
Delta Sigma 2 24-bit 0.12ksps Differential, Single Ended Voltage Surface Mount MSOP 10 ±15ppm FSR Serial (SPI) - 3.3 V, 5 V 3 x 3 x 0.85mm