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. 639-4187
Mfr. Part No.ADC121S021CIMF/NOPB
HK$19.582
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. 102-5605
Mfr. Part No.ADC121S021CIMF/NOPB
HK$9.583
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. 102-5606
Mfr. Part No.ADC121S625CIMM/NOPB
HK$23.36
Each (On a Reel of 1000)
units
SAR 1 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 8 ±1LSB Serial (SPI) - 5 V 3 x 3 x 0.86mm
RS Stock No. 639-4200
Mfr. Part No.ADC121S625CIMM/NOPB
HK$50.40
Each (In a Pack of 5)
units
SAR 1 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 8 ±1LSB Serial (SPI) - 5 V 3 x 3 x 0.86mm
RS Stock No. 923-6911
Mfr. Part No.ADS1115IDGST
HK$38.721
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. 504-4724
Mfr. Part No.ADCS7476AIMF/NOPB
HK$31.448
Each (In a Pack of 5)
units
SAR 1 12-bit 1000ksps Single Ended Voltage Surface Mount SOT-23 6 -1.1/1LSB Serial (SPI) - 3.3 V, 5 V 2.92 x 1.6 x 1.02mm
RS Stock No. 121-8294
Mfr. Part No.ADS7866IDBVT
HK$22.638
Each (On a Reel of 250)
units
SAR 1 12-bit 200ksps Single Ended Voltage Surface Mount SOT-23 6 ±1.5LSB Serial (SPI) - 1.8 V, 2.5 V, 3.3 V 2.9 x 1.6 x 1.15mm
RS Stock No. 100-3885
Mfr. Part No.ADCS7476AIMF/NOPB
HK$30.818
Each (On a Reel of 1000)
units
SAR 1 12-bit 1000ksps Single Ended Voltage Surface Mount SOT-23 6 -1.1/1LSB Serial (SPI) - 3.3 V, 5 V 2.92 x 1.6 x 1.02mm
RS Stock No. 389-255
Mfr. Part No.ADS7866IDBVT
HK$36.20
Each
units
SAR 1 12-bit 200ksps Single Ended Voltage Surface Mount SOT-23 6 ±1.5LSB Serial (SPI) - 1.8 V, 2.5 V, 3.3 V 2.9 x 1.6 x 1.15mm
RS Stock No. 639-4216
Mfr. Part No.ADC122S021CIMM/NOPB
HK$22.376
Each (In a Pack of 5)
units
SAR 2 12-bit 200ksps Single Ended Voltage Surface Mount MSOP 8 -1.1/0.8LSB Serial (SPI/QSPI/Microwire) - 3.3 V, 5 V 3 x 3 x 0.86mm
RS Stock No. 709-4544
Mfr. Part No.ADS1115IDGST
HK$58.04
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. 102-5607
Mfr. Part No.ADC122S021CIMM/NOPB
HK$14.32
Each (On a Reel of 1000)
units
SAR 2 12-bit 200ksps Single Ended Voltage Surface Mount MSOP 8 -1.1/0.8LSB Serial (SPI/QSPI/Microwire) - 3.3 V, 5 V 3 x 3 x 0.86mm
RS Stock No. 162-6121
Mfr. Part No.ADS7924IRTET
HK$19.355
Each (On a Reel of 250)
units
SAR 4 12-bit 100ksps Differential Voltage Surface Mount WQFN 16 ±1.5LSB Serial (SPI) Single 5 V 3.15 x 3.15 x 0.8mm
RS Stock No. 732-1648
Mfr. Part No.ADS7924IRTET
HK$29.02
Each
units
SAR 4 12-bit 100ksps Differential Voltage Surface Mount WQFN 16 ±1.5LSB Serial (SPI) Single 5 V 3.15 x 3.15 x 0.8mm
RS Stock No. 517-296
Mfr. Part No.ADC122S625CIMM/NOPB
HK$57.73
Each
units
SAR 2 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 10 ±1LSB Serial (SPI/QSPI/Microwire) - 5 V 3 x 3 x 0.86mm
RS Stock No. 732-1408
Mfr. Part No.TLV1572ID
HK$106.20
Each
units
SAR - 10-bit - Differential Voltage Surface Mount SOIC 8 - Serial (SPI) Single 5 V 5 x 4 x 1.5mm
RS Stock No. 162-4126
Mfr. Part No.ADC122S625CIMM/NOPB
HK$33.968
Each (On a Reel of 1000)
units
SAR 2 12-bit 200ksps Differential, Single Ended Voltage Surface Mount MSOP 10 ±1LSB Serial (SPI/QSPI/Microwire) - 5 V 3 x 3 x 0.86mm
RS Stock No. 662-0192
Mfr. Part No.TLC0838CDW
HK$48.39
Each (In a Pack of 5)
units
SAR 8 8-bit 20ksps Differential, Single Ended Voltage Surface Mount SOIC 20 ±0.4LSB Serial (SPI) - 5 V 12.8 x 7.52 x 2.35mm
RS Stock No. 908-3805
Mfr. Part No.ADS7041IDCUT
HK$17.985
Each (In a Pack of 2)
units
SAR 1 10-bit 1Msps Differential Voltage Surface Mount VSSOP 8 0.8LSB Serial (SPI) Single 1.65 to 3.6 V 2.1 x 2.4 x 0.8mm
RS Stock No. 517-072
Mfr. Part No.ADC101C027CIMK/NOPB
HK$14.018
Each (In a Pack of 5)
units
SAR 1 10-bit 188.9ksps Single Ended Voltage Surface Mount TSOT 6 ±0.7LSB Serial (I2C) - 3.3 V, 5 V 2.97 x 1.65 x 0.87mm