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. 538-4189
Mfr. Part No.AD574AJNZ
SGD82.62
Each
units
SAR 1 12-bit - Single Ended Voltage Through Hole PDIP 28 ±1LSB Parallel - - 39.75 x 14.73 x 4.95mm
RS Stock No. 506-3898
Mfr. Part No.LTC2428CG#PBF
SGD19.34
Each
units
Delta Sigma 8 20-bit 0.008ksps Single Ended Voltage Surface Mount SSOP 28 20ppm Vref Serial (SPI) - 3.3 V, 5 V 10.5 x 5.6 x 2mm
RS Stock No. 506-1454
Mfr. Part No.LTC1859CG#PBF
SGD53.58
Each
units
SAR 8 16-bit 100ksps Differential, Single Ended Voltage Surface Mount SSOP 28 ±3LSB Serial (SPI/Microwire) - 5 V 10.5 x 5.6 x 2mm
RS Stock No. 506-1707
Mfr. Part No.LTC2440CGN#PBF
SGD18.67
Each
units
Delta Sigma 1 24-bit 4ksps Differential Voltage Surface Mount SSOP 16 15ppm Vref Serial (SPI) - 5 V 4.98 x 3.99 x 1.5mm
RS Stock No. 820-9034
Mfr. Part No.AD7291BCPZ
SGD15.17
Each
units
SAR 8 12-bit 22.22ksps Differential Voltage Surface Mount LFCSP WQ 20 ±1LSB Serial (I2C) Single 3 V 4.1 x 4.1 x 0.75mm
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. 716-5860
Mfr. Part No.CS5530-ISZ
SGD9.94
Each
units
Delta Sigma 1 24-bit 3840sps Differential Voltage Surface Mount SSOP 20 ±0.003%FSR Serial (SPI) Dual, Single 5 V 7.5 x 5.6 x 1.88mm
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. 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. 796-8861
Mfr. Part No.AD7988-1BRMZ
SGD18.61
Each
units
SAR 1 16-bit 100ksps Pseudo Differential Voltage Surface Mount MSOP 10 ±1.25LSB Serial (SPI/QSPI/Microwire) Single 1.8 V, 2.5 V, 3 V, 5 V 3.1 x 3.1 x 0.95mm
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. 538-4454
Mfr. Part No.AD7819YNZ
SGD11.72
Each
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. 921-5488
Mfr. Part No.ICL7107CM44Z
SGD8.80
Each (In a Pack of 2)
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. 207-0269
Mfr. Part No.TC7107CPL
BrandMicrochip
SGD6.77
Each
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. 523-8446
Mfr. Part No.AD7705BNZ
SGD17.39
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. 545-6060
Mfr. Part No.LTC1298CN8#PBF
SGD19.14
Each
units
SAR 2 12-bit 11.1ksps Differential, Single Ended Voltage Through Hole PDIP 8 ±2LSB Serial - 5 V 10.16 x 6.48 x 3.3mm
RS Stock No. 506-3832
Mfr. Part No.LTC2400CS8#PBF
SGD19.96
Each
units
Delta Sigma 1 24-bit 0.008ksps Single Ended Voltage Surface Mount SOIC 8 15ppm Vref Serial (SPI) - 3.3 V, 5 V 5 x 3.99 x 1.48mm
RS Stock No. 709-5033
Mfr. Part No.AD7992BRMZ-1
SGD11.15
Each
units
SAR 2 12-bit 188ksps Single Ended Voltage Surface Mount MSOP 10 ±1LSB Serial (I2C) - 3.3 V, 5 V 3 x 3 x 0.85mm
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