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Microchip Technology MCP3561-E/ST
- Part No.:
- MCP3561-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3561-E/ST.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,115
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Product details
Overview
MCP3561-E/ST from Microchip Technology is a single-channel, 24-bit delta-sigma analog-to-digital converter (ADC) with programmable gain (0.33x–64x), up to 153.6 ksps data rate, and integrated burnout current sources for sensor open/short detection. It operates from 2.7V–3.6V AVDD and -40°C to +125°C, delivering 106.7 dB SINAD at 4800 SPS (Gain = 1x) for high-precision industrial sensor front-ends.
For engineers reviewing the MCP3561-E/ST datasheet, MCP3561-E/ST pinout, MCP3561-E/ST application, or MCP3561-E/ST equivalent, this page provides verified technical context, validated pin functions, real-world use cases in factory automation and portable instrumentation, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MCP3561-E/ST implements a second-order delta-sigma modulator with digital SINC3 filtering, configurable oversampling ratio (OSR 32–98304), and internal sequencer (SCAN mode) enabling autonomous multiplexed conversions without MCU intervention. Its analog front-end supports differential or single-ended inputs with programmable gain and internal temperature sensing.
It features dual power domains (AVDD/DVDD), 20 MHz SPI interface (modes 0,0 and 1,1), CRC-secured communications, register map lock with 8-bit secure key, and ultra-low full shutdown current (<5 µA). The device uses either an internal RC oscillator (3.3–6.6 MHz) or external clock (1–20 MHz) for timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit - delivers true 24-bit no-missing-code performance with OSR ≥256, enabling sub-ppm measurement fidelity. |
| Data Rate | Up to 153.6 ksps - supports high-speed sensor sampling while maintaining >105 dB SINAD at lower rates (e.g., 4800 SPS). |
| Programmable Gain | 0.33x to 64x - allows direct interfacing with low-output sensors (e.g., mV-level strain gauges) without external amplification. |
| SINAD / THD | 106.7 dB / -116 dBc - measured at Gain=1x, 4800 SPS, 3.3V supplies; ensures high dynamic range for precision DC and low-frequency AC signals. |
| Temperature Range | -40°C to +125°C - fully specified over extended industrial temperature range, supporting operation in harsh environments. |
| Supply Voltages | AVDD: 2.7–3.6V; DVDD: 1.8–3.6V - dual-domain supply enables flexible system-level power architecture and low-power digital domain operation. |
| Shutdown Current | <5 µA total - ultra-low full shutdown current reduces standby power in battery-powered instrumentation and portable devices. |
Pinout & Package
Package: 20-Lead TSSOP (6.4 mm × 6.4 mm × 1 mm), leaded, RoHS-compliant. Pin 1 marked by notch or dot; NC pins recommended tied to AGND for EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0 | Analog Input Channel 0 | Differential or single-ended input; primary measurement channel for MCP3561 (single-channel variant). |
| CH1 | Analog Input Channel 1 | Second analog input used for differential pair with CH0 or as auxiliary reference/sense point. |
| REFIN+ | External Reference Positive | Non-inverting input for external voltage reference; supports 0.6V–AVDD range for flexible scaling. |
| REFIN- | External Reference Negative | Inverting reference input; must be connected to AGND for single-ended measurements. |
| AVDD | Analog Supply | 2.7–3.6V analog power rail; powers modulator, PGA, and reference circuitry; requires local decoupling. |
| DVDD | Digital Supply | 1.8–3.6V digital power rail; powers SPI interface, control logic, and digital filters; independent of AVDD. |
| AGND / DGND | Analog & Digital Ground | Separate ground returns minimize noise coupling; recommended star-point connection near device. |
| SCK / CS / SDO / SDI | SPI Interface Signals | 20 MHz SPI-compatible interface (modes 0,0 and 1,1); supports DMA-friendly 24/32-bit data formats. |
| IRQ/MDAT | Interrupt / Monitor Data | Dedicated active-low interrupt pin signaling conversion completion or monitor event; supports CRC-secured configuration alerts. |
| MCLKIN | External Master Clock | Accepts 1–20 MHz external clock; bypasses internal oscillator for precise timing control or jitter reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Sequencer (SCAN mode) | Automates multi-channel conversion sequences using internal 24-bit timer-eliminates MCU polling and reduces firmware overhead in sensor arrays. |
| Burnout Current Sources | Integrated constant-current sources detect open-circuit or short-circuit conditions in RTDs and bridge sensors-enables self-diagnostic capability without external components. |
| 24-Bit Offset/Gain Calibration | User-accessible calibration registers allow one-time or periodic correction of system-level offset/gain drift-improves long-term accuracy without hardware recalibration. |
| Secure SPI Interface | 16-bit CRC on all SPI transactions plus IRQ-triggered CRC validation ensures configuration integrity and prevents unauthorized register writes in safety-critical systems. |
| Internal Temperature Sensor | ±5°C accuracy across -40°C to +125°C-provides on-chip thermal monitoring for ambient compensation or system health diagnostics. |
Applications
| Pressure Transducer Interface | Strain Gauge Readout |
|---|---|
Use Scenario: High-resolution pressure measurement in industrial process controllers using piezoresistive transducers with mV-level output. IC Role / Device Role / Timing Role: Primary ADC digitizing differential bridge output; performs auto-zeroing, gain scaling, and CRC-secured data transfer to host MCU. Use Value: 24-bit resolution and 0.33x gain enable direct digitization of low-output transducers; burnout detection identifies failed sensors before system fault escalation. | Use Scenario: Portable load cell instrumentation requiring battery operation and thermal stability over wide ambient ranges. IC Role / Device Role / Timing Role: Single-channel sigma-delta ADC with internal temperature sensor and programmable OSR for adaptive noise filtering. Use Value: Ultra-low shutdown current (<5 µA) extends battery life; ±5°C internal temperature accuracy enables real-time gain/offset compensation. |
| Factory Automation I/O Module | Portable Gas Analyzer Front-End |
Use Scenario: Modular PLC analog input card supporting multiple sensor types (RTD, thermocouple, voltage) via software-configurable gain and reference. IC Role / Device Role / Timing Role: Precision ADC with SCAN-mode sequencer managing multiple input channels and internal diagnostics autonomously. Use Value: Internal sequencer reduces host CPU load; dual supply domains (AVDD/DVDD) simplify isolated power design in DIN-rail mounted modules. | Use Scenario: Handheld gas detection equipment measuring electrochemical sensor outputs with high SNR and low power consumption. IC Role / Device Role / Timing Role: Low-noise ADC (90 nVRMS at 12.5 SPS, Gain=16x) digitizing weak sensor currents converted to voltage via precision transimpedance amplifier. Use Value: 106.7 dB SINAD ensures detection of trace gas concentrations; 20 MHz SPI enables fast data streaming to ARM Cortex-M host during alarm events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1263IPW | 32-pin TSSOP; includes PGA (1–128x), IDACs, and built-in voltage reference; higher max data rate (38.4 ksps) but lower max resolution (24-bit with post-processing). | Targeted at multi-channel, multi-sensor systems requiring integrated excitation and reference; lacks internal temperature sensor. | Select ADS1263IPW when needing on-chip IDACs for RTD biasing or integrated 2.5V reference; MCP3561-E/ST preferred for simpler single-channel designs with lower BOM count. |
| MCP3564-E/ST | Quad-channel version in same 20-lead TSSOP package; identical core architecture, gain, and performance specs-but supports four independent inputs with shared resources. | Used where space-constrained systems require multiple simultaneous sensor measurements (e.g., multi-zone temperature monitoring) without adding ADC ICs. | Select MCP3564-E/ST to consolidate four channels into one footprint; MCP3561-E/ST remains optimal for cost-sensitive, single-input applications with minimal layout complexity. |
Compared with ADS1263IPW and MCP3564-E/ST, the MCP3561-E/ST offers the smallest footprint for single-channel 24-bit conversion, lowest full-shutdown current, and unique integrated burnout detection-making it ideal for compact, low-power, sensor-diagnostic–enabled designs where channel count is fixed at one.
Availability
MCP3561-E/ST is available at Aetrix Electronics and suitable for factory automation I/O modules, portable instrumentation, and precision sensor transmitters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MCP3561-E/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.
The MCP356x family is designed for high-accuracy, low-power sensor signal conditioning in demanding industrial and portable applications-emphasizing integrated diagnostics, security, and simplified system integration.
FAQ
What is the maximum data rate supported by the MCP3561-E/ST?
The MCP3561-E/ST supports a programmable data rate up to 153.6 ksps. This maximum rate is achieved under specific conditions including OSR = 32 and Gain = 1x. At higher gains or oversampling ratios, the effective output rate decreases proportionally-for example, at 4800 SPS (Gain = 1x), the device achieves its peak 106.7 dB SINAD. The actual usable rate depends on system noise requirements and selected OSR/gain configuration.
Does the MCP3561-E/ST include an internal temperature sensor?
Yes, the MCP3561-E/ST integrates an internal temperature sensor with ±5°C accuracy across the full -40°C to +125°C operating range. This sensor is accessible via dedicated register reads and is commonly used for ambient temperature compensation of gain/offset errors or system-level thermal monitoring. It does not replace external calibrated sensors for metrology-grade applications but provides reliable on-die thermal insight for embedded diagnostics.
Can the MCP3561-E/ST operate with separate analog and digital supplies?
Yes, the MCP3561-E/ST features independent AVDD (2.7–3.6V) and DVDD (1.8–3.6V) supply pins, allowing true dual-domain operation. This separation minimizes digital switching noise coupling into the analog path. Designers can optimize each rail independently-for instance, using a low-noise LDO for AVDD and a switched regulator for DVDD-while maintaining full functionality and specified performance across both domains.
What packaging options are available for the MCP3561-E/ST?
The MCP3561-E/ST is offered exclusively in the 20-Lead TSSOP package (6.4 mm × 6.4 mm × 1 mm), with lead finish compliant to RoHS standards. Unlike the MCP3561/2/4 family's UQFN variant, the -E/ST suffix denotes the TSSOP option. This package includes exposed pad grounding recommendations and NC pins intended to be tied to AGND for improved EMI immunity-critical in noisy industrial environments.
How does the burnout current source function in the MCP3561-E/ST?
The MCP3561-E/ST integrates programmable burnout current sources that apply a known constant current (typically ~100 µA) across the sensor input terminals (e.g., CH0–CH1). By measuring the resulting voltage, the system detects open circuits (high voltage) or shorts (near-zero voltage). This feature is especially valuable for verifying integrity of RTDs, thermistors, or bridge sensors before or during conversion-reducing field failure risk without external components.
MCP3561-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 153.6k
- Number of Inputs:
- 1, 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- -
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.7V
- Features:
- Internal Oscillator, PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3561-E/ST FAQ
1.How can I place an order for MCP3561-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3561-E/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP3561-E/ST reliable?
The price and inventory of MCP3561-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3561-E/ST is usually 5 days.
3.What payment methods are accepted for MCP3561-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3561-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3561-E/ST?
MCP3561-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3561-E/ST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP3561-E/ST?
For technical support, including MCP3561-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3561-E/ST requirements.
6.How does Aetrix verify that MCP3561-E/ST is sourced from the original manufacturer or authorized distributors?
All MCP3561-E/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP3561-E/ST meets industry standards.
7.What is the process for return or replacement of MCP3561-E/ST?
All MCP3561-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3561-E/ST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP3561-E/ST part is unused and in its original packaging.
Return procedure for MCP3561-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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