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. 538-4561
Mfr. Part No.AD7706BNZ
$24.55
Each
units
Delta Sigma 3 16-bit 0.5ksps Pseudo 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
$3.465
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. 738-6651
Mfr. Part No.MCP3008-I/SL
BrandMicrochip
$3.985
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. 911-5713
Mfr. Part No.MCP3008-I/SL
BrandMicrochip
$3.037
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. 669-6064
Mfr. Part No.MCP3008-I/P
BrandMicrochip
$4.65
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. 523-8446
Mfr. Part No.AD7705BNZ
$19.33
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. 887-7287
Mfr. Part No.MCP3425A0T-E/CH
BrandMicrochip
$2.807
Each (On a Reel of 3000)
units
Delta Sigma 1 16-bit 0.015ksps Differential, Single Ended Voltage Surface Mount SOT-23 6 10ppm FSR Serial (I2C) - 5 V 3.1 x 1.8 x 1.3mm
RS Stock No. 669-6098
Mfr. Part No.MCP3425A0T-E/CH
BrandMicrochip
$3.95
Each (In a Pack of 2)
units
Delta Sigma 1 16-bit 0.015ksps Differential, Single Ended Voltage Surface Mount SOT-23 6 10ppm FSR Serial (I2C) - 5 V 3.1 x 1.8 x 1.3mm
RS Stock No. 884-6986
Mfr. Part No.LTC2452CTS8#TRMPBF
$5.058
Each (In a Pack of 4)
units
Delta Sigma 1 16-bit - Differential Current, Voltage Surface Mount TSOT-23 8 10LSB Serial (SPI) Single 2.7 to 5.5 V 2.9 x 1.75 x 0.9mm
RS Stock No. 178-8939
Mfr. Part No.LTC2452CTS8#TRMPBF
$3.012
Each (On a Reel of 2500)
units
Delta Sigma 1 16-bit - Differential Current, Voltage Surface Mount TSOT-23 8 10LSB Serial (SPI) Single 2.7 to 5.5 V 2.9 x 1.75 x 0.9mm
RS Stock No. 709-4544
Mfr. Part No.ADS1115IDGST
$9.79
Each
units
Delta Sigma 4 16-bit 0.86ksps Differential, Single Ended Voltage Surface Mount VSSOP 10 1LSB Serial (I2C) - 3.3 V 3 x 3 x 1.02mm
RS Stock No. 145-6331
Mfr. Part No.LTC2411IMS#PBF
$15.481
Each (In a Tube of 37)
units
Delta Sigma 1 24-bit - Differential Current, Voltage Surface Mount MSOP 10 14ppm Serial (SPI) Single 2.7 to 5.5 V 3 x 3 x 0.86mm
RS Stock No. 923-6911
Mfr. Part No.ADS1115IDGST
$6.447
Each (On a Reel of 250)
units
Delta Sigma 4 16-bit 0.86ksps Differential, Single Ended Voltage Surface Mount VSSOP 10 1LSB Serial (I2C) - 3.3 V 3 x 3 x 1.02mm
RS Stock No. 884-6999
Mfr. Part No.LTC2411IMS#PBF
$22.74
Each
units
Delta Sigma 1 24-bit - Differential Current, Voltage Surface Mount MSOP 10 14ppm Serial (SPI) Single 2.7 to 5.5 V 3 x 3 x 0.86mm
RS Stock No. 889-6064
Mfr. Part No.MCP3426A0-E/SN
BrandMicrochip
$3.649
Each (In a Tube of 100)
units
Delta Sigma 2 16-bit 0.015ksps Differential Voltage Surface Mount SOIC 8 10ppm FSR Serial (I2C) Single 2.7 to 5.5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 703-7958
Mfr. Part No.MCP3426A0-E/SN
BrandMicrochip
$4.75
Each
units
Delta Sigma 2 16-bit 0.015ksps Differential Voltage Surface Mount SOIC 8 10ppm FSR Serial (I2C) Single 2.7 → 5.5 V 4.9 x 3.9 x 1.25mm
RS Stock No. 716-5810
Mfr. Part No.CS5343-CZZ
$7.26
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. 911-5583
Mfr. Part No.MCP3427-E/UN
BrandMicrochip
$3.917
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. 703-7949
Mfr. Part No.MCP3427-E/UN
BrandMicrochip
$4.60
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. 169-8385
Mfr. Part No.CS5343-CZZ
$5.887
Each (In a Tray of 96)
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