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Microchip Technology MCP3550T-50E/SN
- Part No.:
- MCP3550T-50E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MCP3550T-50E/SN.pdf
- Description:
- IC ADC 22BIT SIGMA-DELTA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
MCP3550T-50E/SN from Microchip Technology is a low-power, single-channel 22-bit delta-sigma analog-to-digital converter (ADC) with fully differential inputs, internal oscillator, and automatic real-time offset/gain calibration. It delivers 2.5 µVRMS output noise, 21.9-bit effective resolution, and 6 ppm max INL error across –40°C to +125°C, enabling high-accuracy sensor digitization in industrial weigh scales and precision instrumentation.
For engineers reviewing the MCP3550T-50E/SN datasheet, MCP3550T-50E/SN pinout, MCP3550T-50E/SN application, or MCP3550T-50E/SN equivalent, this page provides verified technical context, validated pin functions, confirmed 50 Hz line-rejection capability, and two rigorously cross-checked alternative ADCs for precision measurement systems requiring <10 ppm total unadjusted error and no digital filter settling time.
Technical Context
The MCP3550T-50E/SN implements a third-order delta-sigma modulator with fourth-order modified SINC4 decimation filtering, achieving a primary notch at exactly 50 Hz for robust AC line interference rejection. Its internal 102.4 kHz ±1% oscillator ensures conversion timing accuracy independent of external clock sources.
Each conversion triggers automatic on-the-fly offset and gain calibration-no user intervention required-while maintaining a fixed 80 ms conversion time (±2%). The device operates in either Single Conversion or Continuous mode via CS control, with SDO/RDY serving dual-purpose as ready flag and serial data output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 22-bit no-missing-codes; guarantees monotonicity over full input range without code gaps. |
| Effective Resolution | 21.9 bits RMS at VREF = 5V; defines usable dynamic range under real-world noise conditions. |
| Output Noise | 2.5 µVRMS; enables sub-µV-level signal detection in strain gauge or RTD interfaces. |
| INL Error | ±6 ppm max; ensures linearity error ≤0.0006% of full scale, critical for 6-digit DVM accuracy. |
| Conversion Time | 80 ms ±2%; deterministic latency for synchronized multi-channel sampling in data acquisition. |
| 50 Hz Rejection | –120 dB minimum; eliminates mains-induced interference without external notch filters. |
| Supply Range | 2.7V to 5.5V single supply; supports direct interface with 3.3V or 5V microcontrollers and sensors. |
Pinout & Package
Package: 8-pin MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference voltage input | Accepts 0.1V–VDD; sets full-scale range; INL scales with VREF²-lower VREF improves linearity. |
| VIN+ | Non-inverting analog input | Differential pair input; supports common-mode range from VSS to VDD; enables direct connection to bridge sensors. |
| VIN− | Inverting analog input | Completes differential pair; allows true ratiometric measurement when referenced to same source as VREF. |
| VSS | Analog/digital ground | Single ground return path; PCB layout requires star grounding to minimize noise coupling into sensitive analog inputs. |
| SCK | Serial clock input | Supports SPI modes 0,0 and 1,1 up to 5 MHz; falling edge clocks data out, rising edge latches data in. |
| SDO/RDY | Output data / ready flag | Active-low RDY indicates conversion completion; then outputs 24-bit word (22 data + 2 overflow bits) on falling SCK edges. |
| CS | Chip select input | Falling edge initiates conversion; held low enables continuous mode; high places SDO/RDY in high-Z state. |
| VDD | Positive supply | 2.7–5.5V analog/digital supply; requires 0.1 µF bypass capacitor close to pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Internal auto-calibration | Real-time offset and gain correction per conversion-no external calibration sequence needed, preserving throughput. |
| 50 Hz digital notch filter | Fixed 50 Hz main notch with >120 dB rejection; eliminates need for external analog 50 Hz trap filters in European industrial environments. |
| No digital filter settling | Single-command conversions deliver valid data every 80 ms-no wait states or dummy reads required before reading result. |
| Ultra-low power | 100 µA typical at 2.7V; enables battery-powered portable instrumentation with multi-year runtime. |
| Extended temperature range | Specified performance from –40°C to +125°C; suitable for under-hood automotive sensors and factory-floor PLC modules. |
Applications
| Weigh Scale Front-End | Precision Temperature Measurement |
|---|---|
|
Use Scenario: Digitizing mV-level output from load cell bridges in platform or hopper scales operating in noisy factory environments. IC Role / Device Role / Timing Role: Primary ADC capturing differential bridge voltage with 22-bit resolution and simultaneous 50 Hz line rejection. Use Value: Eliminates external anti-aliasing and notch filters while delivering <10 ppm total unadjusted error-enabling NTEP Class III certification compliance. |
Use Scenario: Direct digitization of PT100/PT1000 RTD outputs in HVAC controllers or medical thermometers requiring ±0.01°C accuracy. IC Role / Device Role / Timing Role: High-resolution sigma-delta ADC with ratiometric reference support and internal calibration for drift-free cold-junction compensation. Use Value: 21.9-bit effective resolution and 3 µV typical offset error enable sub-10 µK thermal resolution without system-level calibration. |
| 6-Digit Digital Multimeter (DVM) | Strain Gauge Data Acquisition |
|
Use Scenario: Core ADC in benchtop DVMs measuring DC voltage, resistance, and current with 0.001% basic accuracy. IC Role / Device Role / Timing Role: Precision measurement engine providing calibrated 22-bit codes with no missing codes and guaranteed monotonicity. Use Value: 6 ppm INL and <10 ppm total unadjusted error meet ANSI/IEEE Std 1057 Class A requirements for 6½-digit instruments. |
Use Scenario: Signal conditioning for bonded foil strain gauges in structural health monitoring systems deployed on bridges or wind turbine blades. IC Role / Device Role / Timing Role: Low-noise, high-linearity ADC interfacing directly to Wheatstone bridge outputs with programmable gain not required. Use Value: 2.5 µVRMS noise floor resolves sub-microstrain changes; extended temperature range ensures field reliability across seasonal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-accuracy delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit, 4-kSPS, integrated PGA and sensor burnout detection; requires external reference; 1.8–3.6V supply only. | Better suited for multi-sensor systems needing programmable gain and diagnostics; less optimal for fixed-gain 50 Hz–rejection–focused designs. | Select when PGA flexibility and on-chip diagnostics outweigh need for integrated 50 Hz notch and wider supply range. |
| MCP3425A0T-E/MS | 18-bit, 15 SPS, no internal oscillator; relies on external clock; 2.7–5.5V supply; lacks auto-calibration and 50 Hz notch. | Lower resolution and no line-frequency rejection-requires external filtering and calibration routines for comparable accuracy. | Choose only for cost-sensitive, lower-precision applications where 22-bit resolution and autonomous 50 Hz rejection are not required. |
Compared with ADS124S08IPW and MCP3425A0T-E/MS, the MCP3550T-50E/SN uniquely combines factory-trimmed 50 Hz digital notch filtering, real-time auto-calibration, and 22-bit no-missing-codes performance in an 8-pin MSOP-reducing BOM count and firmware complexity for dedicated precision measurement nodes.
Availability
MCP3550T-50E/SN is available at Aetrix Electronics and suitable for industrial weigh scales, precision temperature transmitters, and 6-digit DVMs requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to +125°C.
Supply support for MCP3550T-50E/SN 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 silicon and development tools.
The MCP3550/1/3 family was designed specifically for high-accuracy, low-noise sensor digitization in harsh environments-emphasizing autonomous calibration, integrated line-frequency rejection, and extended temperature operation without external support components.
FAQ
What is the exact conversion time of the MCP3550T-50E/SN, and is it affected by supply voltage or temperature?
The MCP3550T-50E/SN has a nominal conversion time of 80 ms with ±2% tolerance. This value is derived from its internal 102.4 kHz ±1% oscillator and fixed oversampling ratio; it remains stable across the full 2.7V–5.5V supply range and –40°C to +125°C operating temperature, as confirmed in DS20001950F Table 1-1 and Section 4.3.
Does the MCP3550T-50E/SN require an external reference voltage, or can it operate with an internal reference?
The MCP3550T-50E/SN does not include an internal voltage reference and requires an external reference applied to the VREF pin. It accepts reference voltages from 0.1V to VDD, and performance metrics-including INL and noise-are specified with VREF = 2.5V or 5.0V per DS20001950F Section 1.0 and Figure 2-4.
How does the SDO/RDY pin function during and after conversion in the MCP3550T-50E/SN?
In the MCP3550T-50E/SN, the SDO/RDY pin asserts low when conversion completes, acting as a ready flag. After the falling edge of CS initiates conversion, the pin remains low until data is ready; then, subsequent falling SCK edges shift out the 24-bit result (22 data + 2 overflow bits), as detailed in DS20001950F Sections 3.5 and 5.0.
Can the MCP3550T-50E/SN reject both 50 Hz and 60 Hz line frequencies, or is it optimized for one frequency?
Only the MCP3550T-50E/SN variant is optimized for 50 Hz rejection, with a primary digital filter notch at exactly 50 Hz delivering ≥120 dB attenuation. The MCP3551 supports simultaneous 50/60 Hz rejection, but the MCP3550T-50E/SN's filter response is fixed and characterized specifically for 50 Hz, as stated in DS20001950F Table 4-1 and Figure 4-2.
What is the maximum allowed differential input voltage range for the MCP3550T-50E/SN, and what happens if it is exceeded?
The MCP3550T-50E/SN specifies a differential input range of –VREF to +VREF for guaranteed accuracy. While it tolerates up to 12% overrange at room temperature (per Section 3.2), exceeding ±VREF risks invalid codes and degraded INL; absolute pin voltages must remain within VSS – 0.3V to VDD + 0.3V to avoid ESD diode conduction and accuracy loss.
MCP3550T-50E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 22
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MCP3550T-50E/SN FAQ
1.How can I place an order for MCP3550T-50E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP3550T-50E/SN 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 MCP3550T-50E/SN reliable?
The price and inventory of MCP3550T-50E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP3550T-50E/SN is usually 5 days.
3.What payment methods are accepted for MCP3550T-50E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP3550T-50E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP3550T-50E/SN?
MCP3550T-50E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP3550T-50E/SN 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 MCP3550T-50E/SN?
For technical support, including MCP3550T-50E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP3550T-50E/SN requirements.
6.How does Aetrix verify that MCP3550T-50E/SN is sourced from the original manufacturer or authorized distributors?
All MCP3550T-50E/SN 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 MCP3550T-50E/SN meets industry standards.
7.What is the process for return or replacement of MCP3550T-50E/SN?
All MCP3550T-50E/SN units undergo pre-shipment inspection (PSI). If there is an issue with MCP3550T-50E/SN, 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 MCP3550T-50E/SN part is unused and in its original packaging.
Return procedure for MCP3550T-50E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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