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Analog Devices Inc. LTC2421IMS#TRPBF
- Part No.:
- LTC2421IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2421IMS#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,288
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Product details
Overview
LTC2421IMS#TRPBF from Analog Devices (formerly Linear Technology) is a 1-channel, 20-bit micropower delta-sigma ADC in MSOP-10 package, operating from 2.7V to 5.5V supply. It delivers 8ppm INL, 1.2ppm RMS noise, and no-latency digital filtering with single-cycle settling-enabling direct high-precision digitization of bridge sensors and strain gauges in weight scales and industrial instrumentation.
For engineers reviewing the LTC2421IMS#TRPBF datasheet, LTC2421IMS#TRPBF pinout, LTC2421IMS#TRPBF application, or LTC2421IMS#TRPBF equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative options, and supply support for production-grade embedded sensing systems.
Technical Context
The LTC2421IMS#TRPBF implements a proprietary no-latency ∆Σ architecture with an integrated decimating FIR filter that settles fully within one conversion cycle-eliminating traditional settling delays in multiplexed or dynamic sensor applications. Its internal oscillator enables 50Hz/60Hz ±2% notch rejection ≥110dB without external timing components.
It supports pseudo-differential bridge digitization via programmable zero-scale (ZSSET) and full-scale (FSSET) inputs, enabling live-zero operation with extended input range from –12.5% VREF to +112.5% VREF. The 24-bit SPI/MICROWIRE-compatible serial interface operates in internal or external clock modes, with EOC signaling and channel/status bits embedded in the data stream.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit no-missing-codes output - guarantees monotonicity and eliminates code gaps in precision measurement systems. |
| INL | 8ppm max over temperature - ensures ≤0.0008% full-scale linearity error for calibrated transducer interfaces. |
| RMS Noise | 1.2ppm of VREF - translates to ~6µV RMS noise at 5V reference, enabling sub-10µV signal resolution. |
| Supply Current | 200µA typical in conversion mode - allows continuous high-resolution sampling in battery-powered portable instruments. |
| Notch Rejection | ≥110dB at 50Hz or 60Hz ±2% - suppresses mains interference without external filters or software averaging. |
| Input Range | –0.125 × VREF to +1.125 × VREF - accommodates sensor offset, gain drift, and 12.5% overrange without clipping. |
| Reference Range | 0.1V to VCC - supports low-voltage references for improved INL while maintaining compatibility with system rails. |
Pinout & Package
Package: 10-lead plastic MSOP (MS10), 3mm × 3mm × 1.1mm, exposed pad optional, rated for –40°C to +85°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 2.7V–5.5V analog/digital rail; requires local 10µF tantalum + 0.1µF ceramic bypass to GND for noise immunity. |
| FSSET (Pin 2) | Full-scale reference input | Defines upper bound of conversion range; FSSET – ZSSET = VREF; sets FFFFH output when VIN = FSSET. |
| CH1 (Pin 3) | Channel 1 analog input | No-connect on LTC2421IMS#TRPBF; reserved for LTC2422 dual-channel variant only. |
| CH0 (Pin 4) | Primary analog input | Pseudo-differential input node; accepts signals from –0.125×VREF to +1.125×VREF relative to ZSSET. |
| ZSSET (Pin 5) | Zero-scale reference input | Defines lower bound of conversion range; sets 00000H output when VIN = ZSSET; enables live-zero calibration. |
| GND (Pin 6) | Common ground reference | Single-point analog/digital/reference ground connection; must tie directly to PCB ground plane. |
| CS (Pin 7) | Active-low chip select | Wakes device from sleep (20µA) into conversion mode; controls SDO output enable and aborts ongoing data transfer. |
| SDO (Pin 8) | 3-state serial data output | Outputs 24-bit frame (4 status + 20 data bits); EOC bit available before clocking; high-Z when CS = HIGH. |
| SCK (Pin 9) | Bidirectional serial clock | Output in internal-clock mode (19.2kHz); input in external-clock mode; auto-configured at power-up edge. |
| FO (Pin 10) | Frequency control input | Selects internal 50Hz (FO = GND) or 60Hz (FO = VCC) notch; or accepts external 2.56–307.2kHz clock for custom rejection. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency ∆Σ conversion | Digital filter settles in one cycle - enables true real-time sampling of rapidly changing sensor outputs without delay compensation. |
| Auto-calibrating architecture | Per-conversion offset and full-scale calibration - maintains <0.5ppm offset drift and <4ppm full-scale drift over temperature and time. |
| Pseudo-differential bridge interface | ZSSET/FSSET pins allow direct connection to Wheatstone bridges - eliminates need for external level-shifting or amplification stages. |
| Extended input voltage range | –12.5% to +112.5% of VREF - absorbs sensor zero-shift, amplifier offset, and overvoltage transients without saturation or data loss. |
| Integrated 50/60Hz notch filter | ≥110dB rejection without crystals or external RC networks - reduces BOM count and layout sensitivity in noisy industrial environments. |
| SPI/MICROWIRE-compatible interface | 24-bit frame with embedded status bits (EOC, sign, channel, range) - simplifies firmware parsing and enables interrupt-driven acquisition. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
|
Use Scenario: High-accuracy platform scales using load-cell bridges with ±0.01% readability requirements. IC Role / Device Role / Timing Role: Primary ADC digitizing mV-level differential bridge output; provides live-zero offset compensation and 20-bit resolution at 7.5Hz output rate. Use Value: Eliminates external instrumentation amplifier and digital filtering, reducing component count by 4+ parts while maintaining 100,000-count resolution. |
Use Scenario: RTD or thermistor-based temperature monitoring in HVAC controllers and environmental sensors. IC Role / Device Role / Timing Role: Direct ratiometric digitization of 2-/3-wire RTD circuits using ZSSET/FSSET for self-calibrated reference scaling. Use Value: Achieves <0.02°C repeatability over –40°C to +85°C without external calibration tables or lookup routines. |
| Gas Analyzers | Strain Gauge Transducers |
|
Use Scenario: Electrochemical gas sensors requiring stable, low-drift digitization of nA-level current outputs via transimpedance amplifiers. IC Role / Device Role / Timing Role: High-PSRR, low-noise ADC capturing amplified sensor voltage with 110dB 50/60Hz rejection in AC-powered analyzers. Use Value: Removes need for synchronous demodulation or DSP-based notch filtering, lowering firmware complexity and power consumption. |
Use Scenario: Structural health monitoring using bonded foil strain gauges on bridges, pipelines, or aerospace components. IC Role / Device Role / Timing Role: Low-power, high-INL ADC interfacing to quarter-bridge configurations with thermal drift compensation via ZSSET tracking. Use Value: Enables battery-operated wireless nodes with >1-year runtime while delivering <1µε resolution at 1kHz sample bursts. |
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 |
|---|---|---|---|
| LTC2401CMS8#PBF | 32-bit output, 1-channel, same MSOP-8 package; higher resolution but 2× slower conversion (260ms vs 133ms); no FO pin for notch selection. | Used where ultra-low noise (<0.3ppm) is prioritized over speed and flexible line-frequency rejection. | Select LTC2421IMS#TRPBF when 20-bit resolution suffices and 50/60Hz adaptability or faster throughput is required. |
| ADS124S08IPWR | 24-bit, 12-channel, SPI interface; integrated PGA (1–128×); no built-in 50/60Hz notch; requires external clock or GPIO timing control. | Preferred in multi-sensor systems needing channel multiplexing and programmable gain, but adds layout and firmware overhead. | Choose LTC2421IMS#TRPBF for minimal-footprint, single-channel, self-contained precision digitization with zero external timing components. |
Compared with LTC2401CMS8#PBF and ADS124S08IPWR, the LTC2421IMS#TRPBF uniquely combines no-latency filtering, integrated 50/60Hz rejection, and pseudo-differential bridge interface in a 10-pin MSOP-reducing system-level calibration effort and eliminating external oscillator components required by alternatives.
Availability
LTC2421IMS#TRPBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, gas analyzers, and strain gauge transducers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.
Supply support for LTC2421IMS#TRPBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2421IMS#TRPBF belongs to ADI's legacy Linear Technology precision ADC family, designed specifically for low-power, high-accuracy sensor digitization in space-constrained industrial instrumentation where noise, drift, and mains interference must be minimized without complex system-level mitigation.
FAQ
What is the operating temperature range for the LTC2421IMS#TRPBF?
The LTC2421IMS#TRPBF is specified for –40°C to +85°C (I-grade), making it suitable for industrial environments including factory automation, outdoor instrumentation, and embedded control systems. This rating is confirmed in the Absolute Maximum Ratings table and Operating Temperature Range section of the official datasheet (24212f), and applies to the IMS suffix variant.
Does the LTC2421IMS#TRPBF require external passive components for its internal oscillator?
No, the LTC2421IMS#TRPBF requires no external passive components for oscillator operation. Its integrated oscillator supports 50Hz (FO = GND) or 60Hz (FO = VCC) notch filtering autonomously. External clocking (2.56–307.2kHz) is optional and driven directly into the FO pin-no resistors, capacitors, or crystals are needed in either configuration.
How does the extended input range of the LTC2421IMS#TRPBF improve system robustness?
The LTC2421IMS#TRPBF supports –12.5% to +112.5% of VREF input range (i.e., ZSSET – 0.12VREF to FSSET + 0.12VREF). This accommodates sensor zero drift, amplifier offset errors, and transient overvoltages without clipping-allowing reliable measurements even when front-end circuitry deviates from ideal conditions, thereby reducing field failure rates.
Can the LTC2421IMS#TRPBF interface directly with a Wheatstone bridge without signal conditioning?
Yes-the LTC2421IMS#TRPBF supports pseudo-differential bridge digitization via dedicated ZSSET and FSSET pins. When connected to bridge outputs, it performs ratiometric conversion with live-zero capability, eliminating the need for external op-amps, level shifters, or discrete reference buffers in many strain-gauge and load-cell applications.
What is the significance of the 24-bit output format of the LTC2421IMS#TRPBF?
The LTC2421IMS#TRPBF outputs a 24-bit frame: 4 status bits (EOC, channel, sign, extended range) followed by 20 data bits. This structure enables interrupt-driven acquisition (via EOC), automatic channel identification, polarity detection, and overrange indication-all without additional GPIOs or post-processing, simplifying microcontroller firmware integration.
LTC2421IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- 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 ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2421IMS#TRPBF FAQ
1.How can I place an order for LTC2421IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2421IMS#TRPBF 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 LTC2421IMS#TRPBF reliable?
The price and inventory of LTC2421IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2421IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2421IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2421IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2421IMS#TRPBF?
LTC2421IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2421IMS#TRPBF 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 LTC2421IMS#TRPBF?
For technical support, including LTC2421IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2421IMS#TRPBF requirements.
6.How does Aetrix verify that LTC2421IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2421IMS#TRPBF 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 LTC2421IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2421IMS#TRPBF?
All LTC2421IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2421IMS#TRPBF, 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 LTC2421IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2421IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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