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ADS8254IRGCR ADS8254IRGCR 9768 Texas Instruments IC ADC 16BIT SAR 64VQFN 64-VFQFN Exposed Pad
ADS5546IRGZ25 ADS5546IRGZ25 5885 Texas Instruments IC ADC 14BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS6125IRHB25 ADS6125IRHB25 29013 Texas Instruments IC ADC 12BIT PIPELINED 32VQFN 32-VFQFN Exposed Pad
TDA8763AM/4/C5,118 TDA8763AM/4/C5,118 17583 NXP USA Inc. IC ADC 10BIT SIGMA-DELTA 28SSOP 28-SSOP (0.209", 5.30mm Width)
ADS6223IRGZ25 ADS6223IRGZ25 20977 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS5527IRGZ25 ADS5527IRGZ25 11763 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS6129IRGZ25 ADS6129IRGZ25 12970 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS6142IRHB25 ADS6142IRHB25 11447 Texas Instruments IC ADC 14BIT PIPELINED 32VQFN 32-VFQFN Exposed Pad
ADS61B23IRHB25 ADS61B23IRHB25 26533 Texas Instruments IC ADC 12BIT PIPELINED 32VQFN 32-VFQFN Exposed Pad
ADS6224IRGZ25 ADS6224IRGZ25 5583 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS62P23IRGC25 ADS62P23IRGC25 20207 Texas Instruments IC ADC 12BIT PIPELINED 64VQFN 64-VFQFN Exposed Pad
ADS5517IRGZ25 ADS5517IRGZ25 19116 Texas Instruments IC ADC 11BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS5562IRGZ25 ADS5562IRGZ25 20075 Texas Instruments IC ADC 16BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADC1415S105HN/C1,5 ADC1415S105HN/C1,5 7086 NXP USA Inc. IC ADC 14BIT PIPELINED 40HVQFN 40-VFQFN Exposed Pad
ADS8517IPW ADS8517IPW 14775 Texas Instruments IC ADC 16BIT SAR 28TSSOP 28-TSSOP (0.173", 4.40mm Width)
ADS6128IRGZ25 ADS6128IRGZ25 2336 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS6143IRHB25 ADS6143IRHB25 25071 Texas Instruments IC ADC 14BIT PIPELINED 32VQFN 32-VFQFN Exposed Pad
ADS5525IRGZ25 ADS5525IRGZ25 27379 Texas Instruments IC ADC 12BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS5545IRGZ25 ADS5545IRGZ25 9502 Texas Instruments IC ADC 14BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad
ADS5547IRGZ25 ADS5547IRGZ25 17524 Texas Instruments IC ADC 14BIT PIPELINED 48VQFN 48-VFQFN Exposed Pad

Analog to Digital Converters (ADC)

1. What are Analog to Digital Converters (ADC)?

‌Basic Definition

ADC (Analog-to-digital converter) is an electronic device that converts continuously changing analog signals (such as voltage and current) into discrete digital signals (binary code). It builds a bridge between the physical world (analog signal) and digital systems (processors, controllers).

 

‌Functional Significance

Digital systems (such as microprocessors) can only process binary signals (0/1), while the analog signals output by physical sensors (temperature, pressure, etc.) need to be converted into digital quantities through ADC before they can be recognized and processed by digital circuits.

 

2. How does Analog to Digital Converters (ADC) Work?

The conversion process of ADC includes four key steps:

‌Sampling‌: Collect the instantaneous value of the analog signal at fixed time intervals.

‌Holding‌: Hold the sampled value for a short time to ensure signal stability during conversion.

‌Quantization‌: Map the sampled value to a finite discrete level (determined by the resolution).

‌Encoding‌: Convert the quantized value to a binary digital output.

 

For example, a 4-bit ADC divides the analog voltage into 24=16 discrete levels and outputs a 4-bit binary code to represent the relative voltage value.

 

3. Key Performance Parameters of Analog to Digital Converters (ADC)

‌Resolution

The number of bits of the output digital quantity (such as 8 bits, or 12 bits) determines the minimum resolvable voltage (Vref/(2N−1)).

 

‌Sampling Rate

The number of samples per second (Hz), which must meet the Nyquist theorem (twice higher than the highest frequency of the signal).

 

‌Reference Voltage 

The reference standard for conversion, the output digital quantity represents the ratio of the input signal to the reference voltage.

 

4. What are Analog to Digital Converters (ADC) Used for?

‌Automotive electronics‌: temperature/pressure sensor signal conversion to ECU (electronic control unit).

‌Medical Equipment‌: digital acquisition of physiological signals (such as electrocardiogram, blood pressure).

‌Industrial Control‌: real-time monitoring of analog quantities (flow, displacement) and feedback to digital systems.

 

5. What are the Types of Analog to Digital Converters (ADC)?

ADC types are diverse, including:

‌Successive Approximation Register (SAR) ‌: balance speed and accuracy.

‌Σ-Δ Type‌: high-resolution audio processing.

‌Pipeline Type‌: high-speed communication system.

 

ADC is the core interface device of modern electronic systems, and its performance directly affects the accuracy and efficiency of data acquisition.

 

6. Analog to Digital Converters (ADC) FAQs

1)‌How to reduce ADC errors? ‌

Use an external high-stability reference voltage source (instead of an internal reference);

Add hardware filtering (such as RC low-pass filtering) to reduce noise;

Optimize PCB layout: shorten signal routing and keep away from high-frequency interference sources;

Software calibration of offset/gain errors.

 

2) ‌What to do if the input signal amplitude is too small? ‌

The pre-gain amplifier (PGA) amplifies the signal to the ADC range and improves the effective resolution.

 

3) ‌How to avoid interference when acquiring multiple channels? ‌

Configure a reasonable sampling time (allow the signal to stabilize);

Use differential input mode to suppress common-mode noise.

 

4) ‌How to choose an ADC model? ‌

Resolution: The more subtle the change in sensor output, the higher the bit number required (e.g. 12 bits for temperature monitoring, 16 bits or more for audio acquisition);

Sampling Rate: Dynamic signals (e.g. audio) require MHz level, and low-speed sensors can be reduced to kSPS35.

 

5) ‌What is the performance of the built-in ADC of MCUs such as STM32? ‌

Most of them meet general requirements: 12-bit resolution, 1MSPS sampling rate, support for multi-channel scanning and calibration functions, and better cost performance than external ADC chips.