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Analog Devices Inc. LTC2422IMS#PBF
- Part No.:
- LTC2422IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2422IMS#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
LTC2422IMS#PBF 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-enabling precise, real-time digitization of low-frequency sensor signals such as strain gauge outputs or thermocouple voltages.
For engineers reviewing the LTC2422IMS#PBF datasheet, LTC2422IMS#PBF pinout, LTC2422IMS#PBF application, or LTC2422IMS#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 2-channel pseudo-differential bridge digitizer use cases, and two field-tested alternative parts with documented functional trade-offs.
Technical Context
The LTC2422IMS#PBF 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 sensor systems. Its internal oscillator supports automatic 50Hz or 60Hz ±2% notch rejection without external components.
It accepts user-defined reference voltage (0.1V to VCC) and features extended input range from –12.5% VREF to +112.5% VREF (VREF = FSSET – ZSSET), enabling seamless interfacing with offset-prone transducers and analog front-ends. Channel auto-selection (ping-pong) between CH0 and CH1 is built-in and requires no configuration registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes-guarantees monotonicity across full dynamic range for precision measurement integrity. |
| INL | 8 ppm of VREF max-ensures ≤±0.0008% full-scale linearity error in high-accuracy weight scale or instrumentation designs. |
| RMS Noise | 1.2 ppm of VREF-translates to ~6 µV RMS noise at 2.5V reference, supporting sub-microvolt signal resolution. |
| Supply Current | 200 µA typical in conversion mode-enables battery-powered portable data loggers with multi-week runtime. |
| Notch Rejection | ≥110 dB at 50Hz or 60Hz ±2%-rejects mains interference without external filtering in industrial environments. |
| Input Range | –0.125 × VREF to +1.125 × VREF-accommodates ±12.5% sensor overrange/underrange without clipping or recalibration. |
| Conversion Time | 130.9–136.2 ms (FO = GND); 157.0–163.4 ms (FO = VCC)-fixed deterministic timing simplifies synchronous system scheduling. |
Pinout & Package
Package: 10-lead plastic MSOP (MS10), 3 mm × 3 mm, 0.5 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass to GND for stable conversion performance. |
| FSSET (Pin 2) | Full-scale reference input | Defines upper bound of input range; when VIN = FSSET, output = FFFFFH (20-bit full scale). |
| CH1 (Pin 3) | Channel 1 analog input | Pseudo-differential input; used alternately with CH0 in automatic ping-pong mode for dual-sensor monitoring. |
| CH0 (Pin 4) | Channel 0 analog input | Pseudo-differential input; primary channel for first conversion; automatically selected before CH1 in LTC2422 sequence. |
| ZSSET (Pin 5) | Zero-scale reference input | Defines lower bound of input range; when VIN = ZSSET, output = 00000H (zero scale); VREF = FSSET – ZSSET. |
| GND (Pin 6) | Common ground reference | Single-point analog/digital/reference ground connection; must tie directly to low-impedance ground plane. |
| CS (Pin 7) | Active-low chip select | Wakes device from sleep (CS = LOW); enables SDO output; HIGH forces auto-shutdown (20 µA sleep current). |
| SDO (Pin 8) | 3-state serial data output | 24-bit output stream (4 status + 20 data bits); EOC bit (bit 23) available immediately on CS assertion for interrupt-driven MCU polling. |
| SCK (Pin 9) | Bidirectional serial clock | Auto-configured as output (internal clock mode) or input (external clock mode) based on power-up state and CS edge timing. |
| FO (Pin 10) | Frequency control input | Selects internal oscillator mode: GND = 60Hz notch, VCC = 50Hz notch, or external clock (2.56–307.2 kHz) for custom rejection frequency. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency ∆Σ architecture | Digital filter settles in one conversion cycle-enables true real-time sampling of rapidly changing sensor outputs without data delay or buffer management. |
| Automatic channel ping-pong | Hardware-managed alternating conversion between CH0 and CH1-eliminates software sequencing overhead in dual-transducer systems. |
| Live zero extended input range | –12.5% to +112.5% VREF range-absorbs gain/offset drift from upstream op-amps or sensor nonlinearity without firmware compensation. |
| On-chip auto-calibration | Offset and full-scale calibration performed every conversion-maintains <0.5 ppm offset drift and <4 ppm full-scale drift over temperature and time. |
| Flexible serial interface | 2- or 3-wire SPI/MICROWIRE-compatible protocol with optional 8-bit padding for drop-in replacement of LTC2402-reduces PCB redesign effort. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-precision platform scales measuring loads from 1g to 100kg using load cell bridges with mV/V output. IC Role / Device Role / Timing Role: Pseudo-differential bridge digitizer with live-zero input range, converting ratiometric bridge voltage while rejecting 50/60Hz mains noise. Use Value: 20-bit resolution and 8ppm INL enable 1:1,000,000 dynamic range-supporting Class III legal-for-trade accuracy without external amplification or filtering. | Use Scenario: RTD or thermistor-based temperature monitoring in HVAC controllers and environmental chambers. IC Role / Device Role / Timing Role: Low-drift, low-power ADC capturing slow-varying analog temperature signals with integrated 50Hz/60Hz rejection in noisy AC-powered enclosures. Use Value: 1.2ppm RMS noise and auto-calibration ensure <0.01°C repeatability over –40°C to +85°C industrial temperature range. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical or NDIR gas sensors requiring stable, low-noise digitization of microamp-level current outputs via precision shunt resistors. IC Role / Device Role / Timing Role: Micropower 20-bit ADC with extended input range digitizing low-level sensor voltages while rejecting ambient EMI and power-line harmonics. Use Value: 200 µA supply current and 110 dB notch rejection allow continuous operation in battery-powered portable analyzers with >6-month runtime. | Use Scenario: Structural health monitoring systems using bonded foil strain gauges on bridges or aircraft components. IC Role / Device Role / Timing Role: Dual-channel pseudo-differential ADC acquiring synchronized strain readings from adjacent gauges to detect differential stress gradients. Use Value: Automatic ping-pong channel selection and no-latency output enable real-time differential strain computation without CPU intervention or timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit micropower ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2422CMS#PBF | Same functionality and pinout; rated for 0°C to 70°C (vs. –40°C to 85°C for IMS grade). | Suitable for commercial-grade instrumentation where extended temperature range is unnecessary. | Select when cost sensitivity outweighs industrial temperature requirements and board space allows same MSOP-10 footprint. |
| ADS124S08IPWR | 24-bit, 4-kSPS, integrated PGA and burnout current sources; requires external reference; no built-in 50/60Hz notch. | Better resolution and integrated signal conditioning, but lacks autonomous line-frequency rejection and consumes >300 µA. | Choose when higher resolution and programmable gain are critical, and system-level digital filtering can replace hardware notch rejection. |
Compared with LTC2422IMS#PBF, LTC2422CMS#PBF offers identical performance at lower cost in benign environments, while ADS124S08IPWR trades autonomous noise rejection and ultra-low power for higher resolution and on-chip analog front-end features-requiring additional design effort for line-frequency suppression.
Availability
LTC2422IMS#PBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, and strain gauge transducer applications requiring stable component supply, long-term production continuity, and guaranteed industrial temperature grade (-40°C to +85°C) performance.
Supply support for LTC2422IMS#PBF 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 LTC2422IMS#PBF belongs to ADI's legacy Linear Technology precision ADC product line, engineered specifically for ultra-stable, low-power, high-resolution sensor digitization in harsh industrial and instrumentation environments.
FAQ
What is the operating temperature range of the LTC2422IMS#PBF?
The LTC2422IMS#PBF is specified for operation from –40°C to +85°C, making it suitable for industrial environments including factory automation, outdoor instrumentation, and automotive under-hood sensing applications. This rating is confirmed in the Absolute Maximum Ratings table and applies across all electrical specifications unless otherwise noted.
Does the LTC2422IMS#PBF require external passive components for its internal oscillator?
No, the LTC2422IMS#PBF requires no external components for its internal oscillator. The FO pin selects between 50Hz (FO = VCC) or 60Hz (FO = GND) notch modes, and the oscillator operates autonomously-eliminating crystals, capacitors, or resistors typically needed for timing stability in competing ADCs.
How does the LTC2422IMS#PBF handle input signals outside the normal 0–VREF range?
The LTC2422IMS#PBF supports an extended input range from –12.5% VREF to +112.5% VREF. Inputs beyond this range are clamped-not damaged-and produce corresponding saturated codes (e.g., FFFFFH for overrange). This accommodates sensor offset drift or amplifier saturation without corrupting downstream data integrity.
Can the LTC2422IMS#PBF be used as a drop-in replacement for the LTC2402?
Yes, the LTC2422IMS#PBF is pin compatible with the LTC2402 and maintains identical timing for the first 24 bits. Though its native output is 24-bit (vs. 32-bit for LTC2402), adding 8 dummy clock pulses yields 32-bit output with last 8 bits always HIGH-enabling hardware-level drop-in replacement without PCB changes.
What is the reference voltage range supported by the LTC2422IMS#PBF?
The LTC2422IMS#PBF accepts a reference voltage (VREF = FSSET – ZSSET) from 0.1V up to VCC. The recommended minimum is 100mV to ensure adequate SNR; performance degrades below this due to fixed input-referred noise, though INL improves slightly at lower references.
LTC2422IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2422IMS#PBF FAQ
1.How can I place an order for LTC2422IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2422IMS#PBF 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 LTC2422IMS#PBF reliable?
The price and inventory of LTC2422IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2422IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2422IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2422IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2422IMS#PBF?
LTC2422IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2422IMS#PBF 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 LTC2422IMS#PBF?
For technical support, including LTC2422IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2422IMS#PBF requirements.
6.How does Aetrix verify that LTC2422IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2422IMS#PBF 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 LTC2422IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2422IMS#PBF?
All LTC2422IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2422IMS#PBF, 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 LTC2422IMS#PBF part is unused and in its original packaging.
Return procedure for LTC2422IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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