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. 758-9982
Mfr. Part No.AD7998BRUZ-1
TWD399.00
Each
units
SAR 8 12-bit 188ksps Single Ended Voltage Surface Mount TSSOP 20 ±1LSB Serial (I2C) Single 2.7 → 5.5 V 6.6 x 4.5 x 1.05mm
RS Stock No. 145-9008
Mfr. Part No.MCP3301-BI/P
BrandMicrochip
TWD88.80
Each (In a Tube of 60)
units
SAR 1 13-bit 100ksps Differential Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) Single 4.5 to 5.5 V 10.16 x 7.11 x 4.95mm
RS Stock No. 639-4187
Mfr. Part No.ADC121S021CIMF/NOPB
TWD166.80
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. 876-7247
Mfr. Part No.MCP3551-E/SN
BrandMicrochip
TWD109.20
Each (In a Tube of 100)
units
Delta Sigma 1 22-bit 13.75sps Differential Voltage Surface Mount SOIC 8 6ppm Serial (SPI) Single 2.7 to 5.5 V 4.9 x 3.9 x 1.5mm
RS Stock No. 681-1095
Mfr. Part No.MCP3001-I/SN
BrandMicrochip
TWD61.00
Each (In a Pack of 2)
units
SAR 1 10-bit 200ksps Pseudo Differential Voltage Surface Mount SOIC 8 ±1LSB Serial (SPI) - 5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 165-4833
Mfr. Part No.MCP3201-BI/P
BrandMicrochip
TWD82.40
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. 100-3840
Mfr. Part No.ADS7828E/250
TWD161.60
Each (On a Reel of 250)
units
SAR 8 12-bit 50ksps Differential, Pseudo Differential Voltage Surface Mount TSSOP 16 ±2LSB Serial (I2C) - 3.3 V, 5 V 5 x 4.4 x 1.15mm
RS Stock No. 770-9751
Mfr. Part No.MCP3301-BI/P
BrandMicrochip
TWD106.00
Each (In a Pack of 2)
units
SAR 1 13-bit 100ksps Differential Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) Single 4.5 → 5.5 V 10.16 x 7.11 x 4.95mm
RS Stock No. 758-9963
Mfr. Part No.AD7985BCPZ
TWD1,141.00
Each
units
SAR 1 16-bit 2.5Msps Pseudo Differential Voltage Surface Mount LFCSP VQ 20 ±1.5LSB Serial (SPI) Single 2.5 V 4 x 4 x 0.95mm
RS Stock No. 761-9327
Mfr. Part No.LTC2442CG#PBF
TWD645.00
Each
units
Delta Sigma 4 24-bit - Differential, Single Ended Voltage Surface Mount SSOP 36 10ppm Serial (SPI) Single 4.5 → 5.5 V 13.1 x 5.6 x 2mm
RS Stock No. 162-4973
Mfr. Part No.ADS7818EB/250
TWD168.60
Each (On a Reel of 250)
units
SAR 1 12-bit 500ksps Pseudo Differential Voltage Surface Mount MSOP 8 ±1LSB Serial - 5 V 3 x 3 x 0.97mm
RS Stock No. 403-913
Mfr. Part No.MCP3202-CI/SN
BrandMicrochip
TWD92.50
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. 716-5810
Mfr. Part No.CS5343-CZZ
TWD149.00
Each
units
Delta Sigma 2 24-bit 96ksps Single Ended Voltage Surface Mount TSSOP 10 - Serial Single 3.3 V, 5 V 3 x 3 x 0.95mm
RS Stock No. 102-5605
Mfr. Part No.ADC121S021CIMF/NOPB
TWD83.40
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. 703-7945
Mfr. Part No.MCP3428-E/SL
BrandMicrochip
TWD129.00
Each
units
Delta Sigma 4 16-bit 0.015ksps Differential Voltage Surface Mount SOIC 14 10ppm FSR Serial (I2C) Single 2.7 → 5.5 V 8.65 x 3.9 x 1.25mm
RS Stock No. 402-897
Mfr. Part No.MCP3551-E/SN
BrandMicrochip
TWD145.00
Each
units
Delta Sigma 1 22-bit 13.75sps Differential Voltage Surface Mount SOIC 8 6ppm Serial (SPI) Single 5 V 4.9 x 3.9 x 1.5mm
RS Stock No. 889-5225
Mfr. Part No.MCP3202-CI/SN
BrandMicrochip
TWD69.80
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. 889-5948
Mfr. Part No.MCP3428-E/SL
BrandMicrochip
TWD107.50
Each (In a Tube of 57)
units
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
RS Stock No. 523-8597
Mfr. Part No.AD7418ARZ
TWD346.00
Each
units
SAR 1 10-bit - Single Ended Voltage Surface Mount SOIC 8 ±1LSB Serial (I2C) - 3.3 V, 5 V 5 x 4 x 1.5mm
RS Stock No. 709-6301
Mfr. Part No.AD7321BRUZ
TWD280.00
Each
units
SAR 2 13-bit 500ksps Differential, Pseudo Differential, Single Ended Voltage Surface Mount TSSOP 14 ±1.1LSB Serial (SPI/QSPI/Microwire) - - 5 x 4.4 x 1mm