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. 709-6679
Mfr. Part No.AD7795BRUZ
SGD17.94
Each
units
Delta Sigma 6 16-bit 0.47ksps Differential Voltage Surface Mount TSSOP 24 ±15ppm FSR Serial (SPI) - 3.3 V, 5 V 7.8 x 4.4 x 1.05mm
RS Stock No. 669-6064
Mfr. Part No.MCP3008-I/P
BrandMicrochip
SGD3.75
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. 889-5143
Mfr. Part No.MCP3008-I/P
BrandMicrochip
SGD3.108
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. 911-5713
Mfr. Part No.MCP3008-I/SL
BrandMicrochip
SGD2.74
Each (In a Tube of 50)
units
SAR 8 10-bit 200ksps Pseudo Differential, Single Ended Voltage Surface Mount SOIC 16 ±1LSB Serial (SPI) - 5 V 9.9 x 3.9 x 1.25mm
RS Stock No. 738-6651
Mfr. Part No.MCP3008-I/SL
BrandMicrochip
SGD3.53
Each (In a Pack of 2)
units
SAR 8 10-bit 200ksps Pseudo Differential, Single Ended Voltage Surface Mount SOIC 16 ±1LSB Serial (SPI) - 5 V 9.9 x 3.9 x 1.25mm
RS Stock No. 835-3822
Mfr. Part No.AD7091R-8BRUZ
SGD13.58
Each
units
SAR 8 12-bit 1Msps Single Ended Voltage Surface Mount TSSOP 24 ±1.25LSB Serial (SPI/QSPI/Microwire) Single 2.7 to 5.25 V 7.9 x 4.5 x 1.05mm
RS Stock No. 669-6054
Mfr. Part No.MCP3002-I/P
BrandMicrochip
SGD3.065
Each (In a Pack of 2)
units
SAR 2 10-bit 200ksps Pseudo Differential, Single Ended Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 159-6624
Mfr. Part No.MCP3002-I/P
BrandMicrochip
SGD2.552
Each (In a Tube of 60)
units
SAR 2 10-bit 200ksps Pseudo Differential, Single Ended Voltage Through Hole PDIP 8 ±1LSB Serial (SPI) - 5 V 9.27 x 6.35 x 3.3mm
RS Stock No. 207-0203
Mfr. Part No.TC7109ACPL
BrandMicrochip
SGD15.61
Each
units
Dual Slope 1 12-bit + Sign 0.01ksps Differential Voltage Through Hole PDIP 40 ±1Counts Parallel - - 53.21 x 14.73 x 4.95mm
RS Stock No. 506-1498
Mfr. Part No.LTC1863CGN#PBF
SGD13.96
Each
units
SAR 8 12-bit 200ksps Differential, Single Ended Voltage Surface Mount SSOP 16 ±1LSB Serial (SPI/Microwire) - 5 V 4.98 x 3.99 x 1.5mm
RS Stock No. 872-2446
Mfr. Part No.TC7109ACPL
BrandMicrochip
SGD15.614
Each (In a Tube of 10)
units
Dual Slope 1 12-bit + Sign 0.01ksps Differential Voltage Through Hole PDIP 40 ±1Counts Parallel - - 53.21 x 14.73 x 4.95mm
RS Stock No. 697-7101
Mfr. Part No.AD7730BNZ
SGD38.18
Each
units
Delta Sigma 2 24-bit 1.2ksps Differential Voltage Through Hole PDIP 24 18ppm FSR Serial (SPI) - 5 V 31.75 x 6.35 x 3.3mm
RS Stock No. 538-6517
Mfr. Part No.AD7918BRUZ
SGD12.08
Each
units
SAR 8 10-bit 1000ksps Single Ended Voltage Surface Mount TSSOP 20 ±0.5LSB Serial (SPI/QSPI/Microwire) - 3 V, 5 V 6.5 x 4.4 x 1.05mm
RS Stock No. 523-8171
Mfr. Part No.AD7714ANZ-5
SGD38.18
Each
units
Delta Sigma 5 24-bit 1ksps Differential, Pseudo Differential Voltage Through Hole PDIP 24 ±0.002%FSR Serial (SPI) - 5 V 31.75 x 6.35 x 3.3mm
RS Stock No. 697-7007
Mfr. Part No.AD7276BUJZ-500RL7
SGD14.10
Each
units
SAR 1 12-bit 3000ksps Single Ended Voltage Surface Mount TSOT 6 ±1LSB Serial (SPI/QSPI/Microwire) - 2.5 V, 3.3 V 2.9 x 1.6 x 0.87mm
RS Stock No. 538-4123
Mfr. Part No.AD7870JNZ
SGD105.98
Each
units
SAR 1 12-bit 100ksps Single Ended Voltage Through Hole PDIP 24 ±0.5LSB Parallel, Serial - - 31.75 x 6.35 x 3.3mm
RS Stock No. 709-4970
Mfr. Part No.AD7890ARZ-10
SGD40.05
Each
units
SAR 8 12-bit 117ksps Single Ended Voltage Surface Mount SOIC W 24 ±1LSB Serial (SPI) - 5 V 15.6 x 7.6 x 2.35mm
RS Stock No. 158-0496
Mfr. Part No.AD7276BUJZ-500RL7
SGD8.431
Each (On a Reel of 500)
units
SAR 1 12-bit 3000ksps Single Ended Voltage Surface Mount TSOT 6 ±1LSB Serial (SPI/QSPI/Microwire) - 2.5 V, 3.3 V 2.9 x 1.6 x 0.87mm
RS Stock No. 774-7844
Mfr. Part No.TC7109CPL
BrandMicrochip
SGD11.65
Each
units
Dual Slope 1 12-bit - Differential Voltage Through Hole PDIP 40 1Counts Parallel, Serial Dual - 52.45 x 14.1 x 4.06mm
RS Stock No. 662-0120
Mfr. Part No.ADS8509IDW
SGD33.38
Each
units
SAR 1 16-bit 250ksps Single Ended Voltage Surface Mount SOIC 20 ±3LSB Serial (SPI) - 5 V 12.8 x 7.52 x 2.35mm