company blog about Recycle Microchip ADCs:SAR ADC,Delta Sigma ADC,Pipelined ADC,Simultaneous Sampling ADC

Recycle Microchip ADCs:SAR ADC,Delta Sigma ADC,Pipelined ADC,Simultaneous Sampling ADC

Shenzhen Mingjiada Electronics Co., Ltd. is a well-established global stockist and recycler of electronic components. We specialise in the long-term recycling of genuine, original electronic components across all series, as well as obsolete stock, surplus stock and samples, helping supply chain enterprises to realise the value of their idle assets.

[Recycling Service Details]

1. Scope of Items Accepted

5G chips, new energy ICs, IoT ICs, Bluetooth ICs, V2X ICs, automotive-grade ICs, communications ICs, AI ICs, memory ICs, sensor ICs, microcontroller ICs, transceiver ICs, Ethernet ICs, Wi-Fi chips, wireless communication modules, connectors, etc.

Recycling Requirements: Goods must originate from legitimate sources (manufacturers, distributors, traders); brand-new, factory-sealed items are prioritised; samples, end-of-line stock and entire warehouse lots of dead stock can be assessed.

2. Purchase Models

1. Cash Clearance Purchase: One-off buyout of stock for rapid liquidation; suitable for urgent stock clearance and offering the fastest return on funds;

2. Consignment Sales: Materials are entrusted to Mingjiada for sale on consignment; offers higher returns but involves a longer cycle;

3. Commission Sales: Flexible distribution that reduces logistics costs; suitable for high-value, scarce models.

3. Standard Recycling Process

1. The client compiles a list of materials, specifying model, brand, batch, quantity and packaging condition;

2. Submit the list to Mingjiada’s valuation team; a preliminary quotation will be issued within 24 hours; samples of high-value chips may be sent for verification;

3. Both parties confirm the price and sign an agreement; we support door-to-door collection within mainland China and delivery to our Hong Kong warehouse;

4. Upon receipt, goods undergo quality inspection; payment is made within 24–48 hours following successful verification; settlement is supported in multiple currencies including RMB, HKD and USD.

4. Features of the Buy-Back Service

- Professional team assessments, with in-depth knowledge of signal chain component market trends; premium prices offered for scarce models;

- Compliant handling of inventory materials; we accept goods returned to Hong Kong and obsolete stock resulting from cancelled corporate projects.

I. SAR Successive Approximation Register Analogue-to-Digital Converter (SAR ADC)

Architectural Principles

The SAR ADC utilises a successive bisection approximation algorithm, combined with a sample-and-hold capacitor array, to compare the analogue input with the DAC reference level bit by bit, ultimately outputting a digital code. Features: medium to high speed, medium resolution, low power consumption, no fixed pipeline delay, and support for multiplexed channels; it is the most widely used architecture in industrial control, human-machine interfaces and general-purpose data acquisition.

Representative Products and Key Parameters

1. MCP3204

Resolution: 12-bit; Channels: 4; Sampling rate: 100 kSPS; Power supply: analogue 2.7 V–5.5 V, digital 2.7 V–5.5 V; Input type: single-ended / pseudo-differential; Operating temperature: –40°C to +85°C; Interface: SPI; Package: PDIP, SOIC, TSSOP. Suitable for general-purpose analogue data acquisition in automated equipment and sensor signal acquisition.

2. MCP3208

Resolution: 12-bit; Channels: 8; Sampling rate: 100 kSPS; Power supply: 2.7 V to 5.5 V; Inputs: single-ended / pseudo-differential; Interface: SPI; Temperature range: –40°C to +85°C. Primarily used for multi-channel, low-speed sensor data acquisition.

3. MCP3008

Resolution: 10-bit; Channels: 8; Sampling rate: 200 kSPS; Supply voltage: 2.7 V to 5.5 V; SPI serial interface; Low-power sleep mode. Suitable for low-cost IoT analogue signal acquisition.

Product Advantages

Fixed conversion delay; time-division multiplexing of multiple channels; controllable power consumption; simple peripheral circuitry; moderate cost. Disadvantages: Sampling rate is limited at high precision; high-resolution models exhibit poorer noise performance than Delta-Sigma ADCs.

II. Delta-Sigma (ΔΣ) Analogue-to-Digital Converters

Architectural Principles

Utilises oversampling and noise-shaping techniques to shift quantisation noise to high frequencies, which is then filtered out via digital filtering. These converters are characterised by ultra-high resolution and extremely low noise, making them suitable for measuring very weak signals; whilst their sampling rates are relatively low, they feature a built-in programmable gain amplifier (PGA) and an internal reference source, and are widely used in precision measurement, electricity metering and load cell applications.

Representative Products and Key Specifications

1. MCP3561R

Resolution: 24-bit; single-channel; sampling rate: 153.6 kSPS; built-in voltage reference; power supply: analogue 2.7–3.6 V, digital 1.8–3.6 V; package: µQFN (2 mm × 2 mm); Operating temperature: –40°C to +125°C; high-reliability industrial grade. Suitable for high-precision pressure and temperature sensor data acquisition.

2. MCP3465R

Resolution: 16-bit; single/dual-channel; sampling rate: 153.6 kSPS; built-in Vref; compact µQFN package; wide temperature range: –40°C to +125°C.

3. MCP3421

Resolution: 18-bit; single-channel; sampling rate 240 SPS; SOT-23 micro-package; I²C interface; ultra-low power consumption, ideal for battery-powered precision measurements.

4. MCP3903

6-channel Delta-Sigma ADC; 24-bit; up to 64 kSPS; integrated PGA per channel (up to 32× gain); SINAD up to 91 dB; on-board low-drift reference source (5 ppm/°C); 10 MHz SPI interface; specifically designed for smart meters and multi-phase power monitoring.

Product Advantages

Resolution up to 24-bit; low noise and excellent linearity; PGA amplifies weak signals; many models incorporate a reference voltage. Disadvantages: digital filtering delay is present, making it unsuitable for high-speed closed-loop control applications requiring extremely low latency.

III. Pipeline Analogue-to-Digital Converter (Pipeline ADC)

Architectural Principles

A pipelined architecture comprising multiple cascaded ADC stages, where the signal is sampled and quantised stage by stage; once the pipeline is filled, high-speed sampling data can be output continuously. It features a fixed pipeline delay, balancing high resolution with high sampling rates, and is integrated within certain PIC series MCUs. Once the pipeline is full, a set of conversion results is output per clock cycle, making it suitable for high-frequency analogue signal acquisition.

Product Specifications (PIC24F On-Board Pipeline ADC)

Resolution: 10–12 bits; Sampling rate: 1 MSPS–10 MSPS; Fixed pipeline delay of 8.5 clock cycles; Multi-channel input; Supports DMA for automatic transfer of conversion results; Supply voltage range: 2.5–3.3 V; Industrial-grade wide temperature range. Suitable for high-speed vibration acquisition, high-frequency analogue signal monitoring, and high-speed data acquisition in automated equipment.

Product Advantages

Sampling rates are significantly higher than those of SAR and Delta-Sigma ADCs, with strong continuous throughput capability; Disadvantages: There is a fixed conversion delay, making it unsuitable for closed-loop control applications with extremely stringent real-time phase requirements; static accuracy and noise performance are inferior to those of Delta-Sigma ADCs.

IV. Simultaneous Sampling Analogue-to-Digital Converters (Simultaneous Sampling ADCs)

Architectural Principles

Each channel is equipped with an independent sample-and-hold circuit; all channels complete signal sampling at the same instant, eliminating sampling phase differences between multiple signals. These are commonly used for the synchronous acquisition of three-phase power, motor phase currents and multi-axis sensors; Microchip’s simultaneous sampling ADCs are predominantly based on the Delta-Sigma architecture and integrate an AFE (Analogue Front-End).

Representative Products and Key Specifications

1. MCP3911

2-channel simultaneous-sampling ADC; 24-bit; sampling rate 125 kSPS; high-speed SPI interface; automotive-grade version available; built-in PGA and phase compensation module; suitable for synchronous acquisition of multi-phase motor currents and power monitoring.

2. MCP3919

Three-channel synchronous-sampling Delta-Sigma ADC; built-in PGA and low-drift reference source; SPI up to 20 MHz; supports sampling from Hall sensors, Rogowski coils and shunt resistors; a mainstream device for three-phase metering in smart meters.

3. MCP3914

Eight-channel simultaneous-sampling ADC; 24-bit; PGA gain 1–32; configurable oversampling ratio (OSR): 32–4096; register latching + CRC check to enhance communication reliability; designed for multi-channel power quality monitoring equipment.

Product Advantages

Simultaneous multi-channel signal acquisition with no phase shift makes this an essential solution for power and motor control applications; integrated PGA, phase compensation and digital calibration simplify analogue front-end design; Disadvantages: higher component cost compared to standard time-division SAR ADCs.