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. 697-7401
Mfr. Part No.AD9224ARSZ
TWD898.00
Each
units
Pipelined 1 12-bit 40000ksps Differential, Single Ended Voltage Surface Mount SSOP 28 ±2.5LSB Parallel - 5 V 10.2 x 5.3 x 1.75mm
RS Stock No. 662-0237
Mfr. Part No.TLC1543IN
TWD231.00
Each
units
SAR 11 10-bit 38ksps Single Ended Voltage Through Hole PDIP 20 ±1LSB Serial (SPI) - 5 V 24.33 x 6.35 x 4.57mm
RS Stock No. 506-1460
Mfr. Part No.LTC1860CS8#PBF
TWD212.00
Each
units
SAR 1 12-bit 250ksps Differential, Single Ended Voltage Surface Mount SOIC 8 ±1LSB Serial (SPI) - 5 V 5 x 3.99 x 1.48mm
RS Stock No. 709-4822
Mfr. Part No.AD677JNZ
TWD2,843.00
Each
units
SAR 1 16 bit 100ksps Single Ended Voltage Through Hole PDIP 16 ±2LSB Serial - - 20.07 x 6.35 x 3.3mm
RS Stock No. 887-7287
Mfr. Part No.MCP3425A0T-E/CH
BrandMicrochip
TWD60.00
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. 697-7029
Mfr. Part No.AD7356BRUZ
TWD643.00
Each
units
SAR 2 12-bit 5000ksps Differential Voltage Surface Mount TSSOP 16 ±1LSB Serial (SPI/QSPI/Microwire) - 2.5 V 5 x 4.4 x 1.05mm
RS Stock No. 669-6098
Mfr. Part No.MCP3425A0T-E/CH
BrandMicrochip
TWD79.00
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. 889-6064
Mfr. Part No.MCP3426A0-E/SN
BrandMicrochip
TWD72.20
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. 378-1768
Mfr. Part No.ADS7844E
TWD348.00
Each
units
SAR 8 12-bit 200ksps Differential, Single Ended Voltage Surface Mount SSOP 20 ±2LSB Serial (SPI) - 5 V 8.75 x 4 x 1.5mm
RS Stock No. 497-2173
Mfr. Part No.AD7663ASTZ
TWD867.00
Each
units
SAR 1 16-bit 250ksps Single Ended Voltage Surface Mount LQFP 48 ±3LSB Serial - 5 V 7 x 7 x 1.4mm
RS Stock No. 703-7958
Mfr. Part No.MCP3426A0-E/SN
BrandMicrochip
TWD99.00
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. 923-3710
Mfr. Part No.ADS7828EB/250
TWD175.70
Each (On a Reel of 250)
units
SAR 8 12-bit 50ksps Differential, Pseudo Differential Voltage Surface Mount TSSOP 16 ±1LSB Serial (I2C) - 3.3 V, 5 V 5 x 4.4 x 1.15mm
RS Stock No. 145-0131
Mfr. Part No.TLC1543IN
TWD208.90
Each (In a Tube of 20)
units
SAR 11 10-bit 38ksps Single Ended Voltage Through Hole PDIP 20 ±1LSB Serial (SPI) - 5 V 24.33 x 6.35 x 4.57mm
RS Stock No. 660-7247
Mfr. Part No.ADS7828EB/250
TWD246.00
Each
units
SAR 8 12-bit 50ksps Differential, Pseudo Differential Voltage Surface Mount TSSOP 16 ±1LSB Serial (I2C) - 3.3 V, 5 V 5 x 4.4 x 1.15mm
RS Stock No. 100-3821
Mfr. Part No.ADS7844E
TWD299.10
Each (In a Tube of 50)
units
SAR 8 12-bit 200ksps Differential, Single Ended Voltage Surface Mount SSOP 20 ±2LSB Serial (SPI) - 5 V 8.75 x 4 x 1.5mm
RS Stock No. 523-6052
Mfr. Part No.AD9225ARSZ
TWD1,299.00
Each
units
Pipelined 1 12-bit 25000ksps Differential, Single Ended Voltage Surface Mount SSOP 28 ±2.5LSB Parallel - 5 V 10.2 x 5.3 x 1.75mm
RS Stock No. 820-9034
Mfr. Part No.AD7291BCPZ
TWD350.00
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. 545-6307
Mfr. Part No.LTC1273BCN#PBF
TWD830.00
Each
units
SAR 1 12-bit 300ksps Single Ended Voltage Through Hole PDIP 24 ±1LSB Parallel - 5 V 32.51 x 6.48 x 3.3mm
RS Stock No. 461-4877
Mfr. Part No.ADS7828E/250
TWD251.00
Each
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. 169-8385
Mfr. Part No.CS5343-CZZ
TWD133.60
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