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Microchip Technology MCP3561R-E/ST
- Part No.:
- MCP3561R-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MCP3561R-E/ST.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
MCP3561R-E/ST from Microchip Technology is a single-channel, 24-bit delta-sigma analog-to-digital converter (ADC) with programmable gain (0.33x–64x), 153.6 ksps max data rate, and integrated 2.4V voltage reference (15 ppm/°C drift). It delivers 106.7 dB SINAD and -116 dBc THD at 4800 SPS (gain = 1x), supports differential or single-ended inputs, and operates across -40°C to +125°C for high-accuracy sensor signal conditioning in industrial transmitters.
For engineers reviewing the MCP3561R-E/ST datasheet, MCP3561R-E/ST pinout, MCP3561R-E/ST application, or MCP3561R-E/ST equivalent, this page provides verified specifications, validated UQFN/TSSOP package details, confirmed SPI timing (20 MHz, Mode 0,0/1,1), real-world noise performance (90 nVRMS at 16x/12.5 SPS), and two documented alternative parts with functional and application-level differences.
Technical Context
The MCP3561R-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 multi-channel conversion loops without MCU intervention. Its dual-clock architecture supports either internal RC oscillator (3.3–6.6 MHz) or external master clock (1–20 MHz).
It integrates burnout current sources for RTD/open-wire detection, a ±5°C internal temperature sensor, 24-bit offset/gain calibration registers, and security features including 16-bit CRC on SPI commands and register map lock with 8-bit secure key - all designed for robust operation in safety-critical embedded measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no-missing-code; enables 1 ppm-level precision in pressure/strain measurement systems |
| Data Rate | Up to 153.6 ksps; supports high-speed dynamic sensing while maintaining >105 dB SINAD at lower rates |
| Input Channels | 1 differential or 2 single-ended; matches single-transducer interfaces without external multiplexing |
| Gain Range | 0.33x to 64x programmable analog gain; accommodates mV-level thermocouple outputs up to full-scale sensor bridges |
| Reference | Internal 2.4V ±2% reference with 15 ppm/°C drift; eliminates external REF IC and reduces BOM count |
| Supply Range | AVDD: 2.7–3.6V; DVDD: 1.8–3.6V; enables dual-supply isolation for noise-sensitive analog front-ends |
| Temp Range | -40°C to +125°C; qualified for under-hood automotive sensors and factory automation control cabinets |
Pinout & Package
Package: 20-Lead TSSOP (6.5 mm × 4.4 mm × 1 mm) and 20-Lead UQFN (3 mm × 3 mm × 0.55 mm) with exposed thermal pad (EP). Both packages support the same pin function mapping and are pin-compatible for drop-in replacement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0 | Analog input channel 0 | Differential (+) or single-ended input; primary sensor interface with 510 kΩ input impedance at 0.33x gain |
| REFIN+/OUT | Reference input/output | Configurable as internal 2.4V reference output or external reference input (0.6–AVDD V range) |
| REFIN- | Reference ground | Analog reference return; must be tied to AGND for single-ended operation |
| AVDD / DVDD | Analog/digital supply | Independent 2.7–3.6V (AVDD) and 1.8–3.6V (DVDD) rails enable analog-digital domain isolation |
| SCK / CS / SDI / SDO | SPI interface signals | 20 MHz SPI (Mode 0,0 and 1,1); supports DMA-friendly 24/32-bit read/write formats |
| IRQ/MDAT | Interrupt/data-ready | Dedicated hardware interrupt pin for precise synchronization with MCU conversion triggers |
| AGND / DGND | Analog/digital ground | Separate ground pins minimize digital switching noise coupling into ADC core |
| MCLK | Master clock input | Accepts 1–20 MHz external clock or enables internal RC oscillator (3.3–6.6 MHz) |
Key Features
| Feature | Design Value |
|---|---|
| SCAN mode sequencer | Hardware-based automatic conversion loop with timer and monitor channels - eliminates MCU polling overhead |
| Burnout current sources | Integrated constant-current sources detect open/short faults in 2-/3-/4-wire RTDs and strain gauges |
| Ultra-low shutdown current | <2.4 µA full shutdown - extends battery life in portable instrumentation and wireless sensor nodes |
| 24-bit calibration registers | On-chip offset/gain error correction registers reduce system-level calibration effort and improve repeatability |
| Secure SPI interface | 16-bit CRC on commands + IRQ-verified configuration writes prevent unauthorized register changes |
Applications
| Pressure Transmitter | Strain Gauge Interface |
|---|---|
Use Scenario: High-stability 4–20 mA loop-powered pressure transmitter for HVAC and process control. IC Role / Device Role / Timing Role: Primary ADC digitizing bridge output with programmable gain and internal reference; handles ratiometric measurements and temperature compensation. Use Value: 106.7 dB SINAD and 0.5 ppm/°C gain drift ensure <±0.05%FS accuracy over industrial temperature range without recalibration. |
Use Scenario: Precision load cell readout in industrial weighing and material testing equipment. IC Role / Device Role / Timing Role: Single-channel delta-sigma ADC with burnout detection and SCAN-mode auto-sequencing for excitation control and temperature monitoring. Use Value: Integrated burnout sources and 90 nVRMS noise at 12.5 SPS enable sub-10 µV resolution on mV/V bridge outputs. |
| Portable Gas Analyzer | Motor Phase Current Monitor |
Use Scenario: Battery-operated handheld gas detector using electrochemical or NDIR sensors. IC Role / Device Role / Timing Role: Low-power ADC acquiring slow-varying sensor voltages; uses internal oscillator and full shutdown mode between readings. Use Value: <2.4 µA shutdown current and integrated 2.4V reference reduce standby power and eliminate external components. |
Use Scenario: Real-time phase current sampling in BLDC motor drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-resolution ADC capturing current shunt voltage with 153.6 ksps capability and dedicated IRQ for precise PWM synchronization. Use Value: 20 MHz SPI with IRQ pin enables deterministic latency (<50 ns IRQ assertion) critical for closed-loop FOC timing. |
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-bit resolution, 40 ksps max, integrated PGA (1–128x), no internal reference; requires external 2.5V REF | Higher resolution but lower speed; better suited for ultra-low-frequency DC measurements (e.g., pH meters) | Select ADS1263IPW when >24-bit ENOB and ultra-low drift (<0.5 ppm/°C) are required, and external reference is acceptable. |
| MCP3564R-E/ST | Quad-channel version with identical 24-bit core, same gain/data rate specs, shared SPI bus, and identical package footprint | Direct channel count upgrade path for multi-sensor systems (e.g., 4-wire RTD + thermistor + voltage + current) | Choose MCP3564R-E/ST when expanding from single to quad analog inputs without changing PCB layout or firmware driver architecture. |
Compared with ADS1263IPW and MCP3564R-E/ST, the MCP3561R-E/ST uniquely balances single-channel simplicity, integrated 2.4V reference, and 153.6 ksps throughput - making it optimal for cost-sensitive, space-constrained, single-transducer applications where external reference omission and layout efficiency are decisive.
Availability
MCP3561R-E/ST is available at Aetrix Electronics and suitable for precision sensor transducers, factory automation I/O modules, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP3561R-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 is a global semiconductor company specializing in microcontrollers, analog devices, and mixed-signal ICs, with strong focus on industrial, automotive, and IoT applications.
The MCP356xR family was designed specifically for high-accuracy, low-power sensor signal acquisition in harsh environments - integrating reference, oscillator, diagnostics, and security to reduce system-level design complexity and bill-of-materials cost.
FAQ
What is the maximum achievable effective resolution of the MCP3561R-E/ST?
The MCP3561R-E/ST achieves up to 23.3 bits RMS effective resolution at low data rates (e.g., 12.5 SPS with 16x gain), verified by 90 nVRMS noise performance and 106.7 dB SINAD. This value reflects real-world dynamic performance under specified conditions-not theoretical bit count-and is directly usable in precision measurement system budgeting for the MCP3561R-E/ST.
Does the MCP3561R-E/ST support both differential and single-ended input configurations?
Yes, the MCP3561R-E/ST supports one differential input pair (CH0+/CH0−) or two single-ended inputs (CH0, CH1) via internal multiplexer control. REFIN− must be connected to AGND for single-ended operation, and input voltage range remains 0V to AVDD in both modes - confirmed in DS20006391C-page 7 and page 1.
How does the internal 2.4V reference perform over temperature?
The MCP3561R-E/ST internal 2.4V reference exhibits 15 ppm/°C typical drift over -40°C to +125°C (max 40 ppm/°C), with ±2% initial accuracy at +25°C. Its 14.3 µV RMS noise (chopper-enabled) and 12 ms settling time (with 1 µF bypass) are fully characterized - enabling direct use in high-stability ratiometric bridge measurements without external reference ICs.
Is the MCP3561R-E/ST pin-compatible with other members of the MCP356xR family?
Yes, the MCP3561R-E/ST shares identical 20-pin TSSOP and UQFN footprints and pin functions with MCP3562R-E/ST (dual-channel) and MCP3564R-E/ST (quad-channel), enabling scalable design reuse. Channel count differences are software-configurable; hardware layout remains unchanged across the family - explicitly confirmed in DS20006391C-page 2 and page 3.
What SPI modes and timing compliance does the MCP3561R-E/ST support?
The MCP3561R-E/ST supports SPI Modes 0,0 and 1,1 at up to 20 MHz (DVDD ≥2.7V) or 10 MHz (DVDD <2.7V), with guaranteed tSU/tHD of 5/10 ns and tDO/tDIS of ≤25 ns. All timing parameters are fully specified across -40°C to +125°C in Tables 1-1 and 1-2 of DS20006391C - ensuring reliable interoperability with ARM Cortex-M and RISC-V MCUs.
MCP3561R-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:
- MUX-ADC
- Ratio - S/H:ADC:
- 0:1
- 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, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3561R-E/ST FAQ
1.How can I place an order for MCP3561R-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3561R-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 MCP3561R-E/ST reliable?
The price and inventory of MCP3561R-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 MCP3561R-E/ST is usually 5 days.
3.What payment methods are accepted for MCP3561R-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3561R-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3561R-E/ST?
MCP3561R-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3561R-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 MCP3561R-E/ST?
For technical support, including MCP3561R-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3561R-E/ST requirements.
6.How does Aetrix verify that MCP3561R-E/ST is sourced from the original manufacturer or authorized distributors?
All MCP3561R-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 MCP3561R-E/ST meets industry standards.
7.What is the process for return or replacement of MCP3561R-E/ST?
All MCP3561R-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with MCP3561R-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 MCP3561R-E/ST part is unused and in its original packaging.
Return procedure for MCP3561R-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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