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Analog Devices Inc. LTC2422CMS#TRPBF
- Part No.:
- LTC2422CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2422CMS#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
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Product details
Overview
LTC2422CMS#TRPBF from Analog Devices (formerly Linear Technology) is a 2-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. Designed for high-precision bridge digitization, it supports pseudo-differential inputs, live-zero extended range (–12.5% to +112.5% VREF), and 50/60Hz notch rejection - ideal for strain gauge transducers and industrial process control.
For engineers reviewing the LTC2422CMS#TRPBF datasheet, LTC2422CMS#TRPBF pinout, LTC2422CMS#TRPBF application, or LTC2422CMS#TRPBF equivalent, key selection considerations include its auto-channel ping-pong operation, internal oscillator eliminating external timing components, 24-bit SPI/MICROWIRE-compatible output with status bits, and guaranteed no missing codes across temperature.
Technical Context
The LTC2422CMS#TRPBF implements a proprietary decimating FIR filter architecture that settles in one conversion cycle - eliminating latency typical of conventional ∆Σ ADCs. Its digital filter null is programmable via the FO pin to 50Hz (FO = GND), 60Hz (FO = VCC), or user-defined frequencies (1Hz–120Hz) using an external oscillator.
It performs continuous on-chip offset and full-scale calibration every conversion cycle, ensuring long-term stability against temperature drift, supply variation, and aging. Input range is defined by externally set FSSET and ZSSET pins, enabling seamless accommodation of sensor offset and overrange conditions without signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit no-missing-codes output with 24-bit serial frame (4 status + 20 data bits) |
| INL | 8 ppm of VREF max - enables ±0.0008% full-scale accuracy in precision weighing systems |
| RMS Noise | 1.2 ppm of VREF - supports 20-bit effective resolution at 133 ms conversion time |
| Supply Current | 200 µA active / 20 µA sleep - allows battery-powered portable instrumentation |
| Input Range | –12.5% to +112.5% VREF (VREF = FSSET – ZSSET) - accommodates sensor zero drift and gain error |
| Notch Rejection | ≥110 dB at 50Hz or 60Hz ±2% - eliminates mains interference without external filters |
| Reference Range | 0.1 V to VCC - supports low-voltage reference designs down to 100 mV |
Pinout & Package
Package: 10-lead plastic MSOP (MS10), 3 mm × 3 mm, 0.5 mm pitch, exposed pad (not electrically connected). Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Positive supply input | 2.7V–5.5V analog/digital supply; requires 10µF tantalum + 0.1µF ceramic bypass to GND |
| FSSET (2) | Full-scale reference input | Sets upper end of input range; VIN = FSSET → FFFFFH output |
| CH1 (3) | Channel 1 analog input | Pseudo-differential input for second sensor channel; used only in LTC2422 |
| CH0 (4) | Channel 0 analog input | Primary pseudo-differential input; NC on LTC2421 |
| ZSSET (5) | Zero-scale reference input | Sets lower end of input range; VIN = ZSSET → 00000H output |
| GND (6) | Common ground | Single-point analog/digital/reference/signal ground; must connect directly to ground plane |
| CS (7) | Active-low chip select | Wakes device from sleep; enables SDO; falling edge initiates data output |
| SDO (8) | 3-state serial data output | 24-bit frame (EOC, CH, SIG, EXR, 20-bit result); high-Z when CS = HIGH |
| SCK (9) | Bidirectional serial clock | Output in internal-clock mode (19.2 kHz); input in external-clock mode (≤2 MHz) |
| FO (10) | Frequency control input | Selects 50Hz (GND), 60Hz (VCC), or external oscillator (1–120 Hz notch frequency) |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Digital filter settles in single cycle - enables true multiplexed sampling without data delay or phase mismatch |
| Auto-ping-pong channel selection | LTC2422 automatically alternates between CH0 and CH1 - eliminates need for external MUX control logic |
| Live-zero extended input range | –0.125×VREF to +1.125×VREF - resolves sensor offset and overrange without pre-amplifier clipping |
| On-chip auto-calibration | Per-conversion offset and full-scale correction - maintains <0.5 ppm offset drift and <4 ppm full-scale drift over temperature |
| Internal oscillator | No external crystal or RC network required - reduces BOM count and layout sensitivity while guaranteeing 110 dB 50/60Hz rejection |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in platform scales and analytical balances requiring sub-gram resolution under 50/60Hz ambient noise. IC Role / Device Role / Timing Role: Pseudo-differential bridge digitizer with integrated 50/60Hz notch filtering and live-zero range to absorb thermal zero drift. Use Value: Eliminates external anti-aliasing filters and calibration firmware; achieves 20-bit linearity without post-processing. | Use Scenario: Direct RTD or thermistor interface in HVAC sensors and medical thermometers where self-heating and lead resistance must be minimized. IC Role / Device Role / Timing Role: Low-power, ratiometric ADC with programmable reference scaling and continuous offset calibration. Use Value: Enables 0.01°C resolution with <1 µA bias current, reducing self-heating error below 0.005°C in 100Ω Pt RTDs. |
| Strain Gauge Transducers | Industrial Process Control |
Use Scenario: Monitoring mechanical stress in structural health monitoring systems deployed in factory floors with high EMI. IC Role / Device Role / Timing Role: Dual-channel, low-drift ADC with automatic channel switching and 110 dB common-mode rejection at line frequency. Use Value: Supports simultaneous measurement of tension/compression pairs without timing skew or external synchronization. | Use Scenario: Analog input module in PLC I/O cards measuring 4–20 mA loop signals, pressure transmitters, and flow meters. IC Role / Device Role / Timing Role: Precision front-end with extended input range to handle transmitter zero-span errors and overpressure events. Use Value: Accepts –12.5% to +112.5% of reference voltage - avoids saturation during field calibration or fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2422IMS#TRPBF | Same silicon, –40°C to +85°C industrial temp grade vs. 0°C to +70°C for CMS | Required for outdoor or uncontrolled-ambient deployments; identical pinout and timing | Select IMS for extended temperature range; CMS suffices for lab or climate-controlled environments |
| ADS124S08IPWR | 24-bit, 4-kSPS, integrated PGA and burn-out current sources; SPI-only interface; no internal oscillator | Better suited for multi-sensor systems needing programmable gain; requires external clock and more complex configuration | Choose ADS124S08 for higher resolution and integrated analog front-end; LTC2422CMS#TRPBF for simplicity, lower power, and built-in notch filtering |
Compared with LTC2422IMS#TRPBF, the LTC2422CMS#TRPBF trades extended temperature range for lower cost and same performance in benign environments; versus ADS124S08IPWR, it offers simpler integration and superior 50/60Hz rejection but lacks PGA and burn-out current - making it optimal for fixed-gain, noise-sensitive bridge applications.
Availability
LTC2422CMS#TRPBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, and strain gauge transducers requiring stable component supply, long-term calibration integrity, and immunity to mains-frequency interference.
Supply support for LTC2422CMS#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC242x family was designed specifically for high-accuracy, low-power, no-latency digitization of low-bandwidth industrial sensors - emphasizing ease of use, minimal external components, and robustness in electrically noisy environments.
FAQ
What is the conversion time of the LTC2422CMS#TRPBF?
The LTC2422CMS#TRPBF has a nominal conversion time of 133.53 ms with internal oscillator configured for 60Hz rejection (FO = GND) and 160.23 ms for 50Hz rejection (FO = VCC). When driven by an external oscillator, conversion time equals 20510/fEOSC (kHz) ms - allowing user-defined update rates from ~8.2 Hz to 100 Hz.
Does the LTC2422CMS#TRPBF require external passive components for its oscillator?
No, the LTC2422CMS#TRPBF integrates a precision internal oscillator and requires no external crystals, capacitors, or resistors for 50Hz or 60Hz notch filtering. The FO pin selects the rejection frequency (GND = 60Hz, VCC = 50Hz), and all timing is generated on-chip - simplifying layout and improving long-term stability.
How does the LTC2422CMS#TRPBF handle input overrange and underrange conditions?
The LTC2422CMS#TRPBF supports an extended input range of –12.5% to +112.5% of VREF (where VREF = FSSET – ZSSET). Inputs beyond this range are clamped, not saturated - preserving monotonicity and enabling graceful recovery from sensor faults or calibration offsets without data corruption.
Can the LTC2422CMS#TRPBF interface directly with a microcontroller SPI port?
Yes, the LTC2422CMS#TRPBF uses a 3-wire SPI/MICROWIRE-compatible interface (CS, SCK, SDO) with no MISO/MOSI direction control needed. It operates in either internal-clock mode (SCK output) or external-clock mode (SCK input), and its 24-bit frame includes 4 status bits - enabling direct connection to standard MCU SPI peripherals with minimal GPIO overhead.
Is the LTC2422CMS#TRPBF pin-compatible with earlier Linear Technology ADCs?
Yes, the LTC2422CMS#TRPBF is pin-compatible with the LTC2402, allowing drop-in replacement in existing designs. While the LTC2402 outputs 32 bits, the LTC2422CMS#TRPBF outputs 24 bits (4 status + 20 data); compatibility is maintained by clocking 32 SCK edges and ignoring the final 8 always-high bits - preserving PCB and firmware reuse.
LTC2422CMS#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:
- 2
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2422CMS#TRPBF FAQ
1.How can I place an order for LTC2422CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2422CMS#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 LTC2422CMS#TRPBF reliable?
The price and inventory of LTC2422CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2422CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2422CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2422CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2422CMS#TRPBF?
LTC2422CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2422CMS#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 LTC2422CMS#TRPBF?
For technical support, including LTC2422CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2422CMS#TRPBF requirements.
6.How does Aetrix verify that LTC2422CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2422CMS#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 LTC2422CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2422CMS#TRPBF?
All LTC2422CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2422CMS#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 LTC2422CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2422CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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