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Analog Devices Inc. LTC2440IGN#TRPBF
- Part No.:
- LTC2440IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2440IGN#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,554
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Product details
Overview
LTC2440IGN#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit no-latency delta-sigma ADC with differential inputs, programmable speed/resolution (6.9 Hz to 3.5 kHz), 5 ppm INL, and 2 µVRMS noise at 880 Hz output rate. It operates from 4.5 V to 5.5 V, supports differential reference (0.1 V to VCC), and is used in high-precision weight scales and auto-ranging 6-digit DVMs.
For engineers reviewing the LTC2440IGN#TRPBF datasheet, LTC2440IGN#TRPBF pinout, LTC2440IGN#TRPBF application, or LTC2440IGN#TRPBF equivalent, key selection criteria include its selectable noise–speed trade-off (200 nVRMS/6.9 Hz with 50/60 Hz rejection vs. 2 µVRMS/880 Hz), autosleep current as low as 25 µA, and pin compatibility with LTC2410 for drop-in upgrades in existing designs.
Technical Context
The LTC2440IGN#TRPBF employs a proprietary delta-sigma architecture with on-chip decimating FIR filter and continuous auto-calibration of offset and full-scale every conversion cycle. Its no-latency operation ensures each output corresponds precisely to the immediately preceding conversion, enabling seamless speed/resolution changes between cycles without settling delay or performance degradation.
It supports dual serial interface modes: internal SCK (EXT = HIGH, SCK output) or external SCK (EXT = LOW, SCK input), and offers flexible speed selection via SDI pin state (LOW = 880 Hz / 2 µVRMS; HIGH = 6.9 Hz / 200 nVRMS + 50/60 Hz rejection) or serial programming of ten discrete OSR settings (256 to 32768).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | ±5 ppm of VREF - enables 0.0005% linearity accuracy critical for metrology-grade measurements. |
| Offset Error | ±5 µV max (–40°C to 85°C) - eliminates need for system-level offset trimming in precision sensor interfaces. |
| Output Rate Range | 6.9 Hz to 3.5 kHz - allows real-time trade-off between noise floor (200 nVRMS) and throughput (3.5 kSPS). |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V industrial and test equipment rails. |
| Reference Range | 0.1 V to VCC differential - supports low-voltage references while maintaining full 24-bit dynamic range. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Narrow 16-lead SSOP package (GN) with four dedicated ground pins (Pins 1, 8, 9, 16) for optimal noise immunity and decoupling. Requires 10 µF tantalum + 0.1 µF ceramic bypass on VCC (Pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Ground reference | All four pins must be connected to PCB ground plane; internal connection minimizes ground bounce and improves PSRR. |
| VCC (2) | Positive supply | 4.5–5.5 V analog/digital supply; bypassing required within 1 mm of pin for stable conversion performance. |
| REF+ / REF– (3, 4) | Differential reference inputs | Accept 0.1 V to VCC differential voltage; common-mode range spans GND to VCC, enabling rail-to-rail reference flexibility. |
| IN+ / IN– (5, 6) | Differential analog inputs | Bipolar input range = ±0.5 × VREF; absolute input range extends to GND – 0.3 V / VCC + 0.3 V for robust front-end interfacing. |
| SDI (7) | Speed/resolution select | Logic LOW = fixed 880 Hz mode; HIGH = fixed 6.9 Hz + 50/60 Hz rejection; also accepts serial command for 10-speed selection. |
| EXT (10) | SCK source control | LOW = external clock on SCK (Pin 13); HIGH = internal SCK generated and output on SCK pin. |
| CS (11) | Chip select | Active LOW; wakes device from sleep, enables SDO, and initiates data readout - controls power-state transitions. |
| SDO (12) | Serial data output | 3-state output; delivers 32-bit frame (3 status + 24 result + 5 sub-LSB bits) MSB-first during data output phase. |
| SCK (13) | Serial clock | Bidirectional: input in external mode, output in internal mode; timing-critical for reliable 32-bit data capture. |
| fO (14) | Oscillator control | Tie to GND or VCC to enable internal oscillator; supports external clock up to 12 MHz for precise timing control. |
| BUSY (15) | Conversion status | Active HIGH during conversion; goes LOW when result ready - provides hardware handshake for interrupt-driven reads. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Each 32-bit output corresponds exactly to the prior conversion cycle - enables true real-time multiplexed acquisition without pipeline delay. |
| Continuous auto-calibration | Offset and full-scale corrected every conversion - eliminates drift-induced errors over temperature, time, and supply variation. |
| Autosleep power management | Draws only 25 µA at 6.9 Hz output rate - reduces average power by >95% vs. continuous conversion mode. |
| 50/60 Hz simultaneous rejection | 200 nVRMS noise at 6.9 Hz includes notch filtering at both 50 Hz and 60 Hz - ideal for AC-line-noise-prone industrial environments. |
| Pin compatibility with LTC2410 | Same 16-pin SSOP footprint and signal mapping - allows direct replacement in legacy designs without PCB rework. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-resolution load cell measurement in commercial and industrial weighing systems requiring NTEP or OIML certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing differential bridge output with <5 ppm INL and <5 µV offset to resolve sub-milligram changes. Use Value: Enables 1:1,000,000 resolution with guaranteed monotonicity and no missing codes - meets Class III/III L metrology requirements. |
Use Scenario: Precision benchtop digital voltmeters supporting automatic range switching and 6½-digit display accuracy. IC Role / Device Role / Timing Role: Core measurement engine performing high-speed, low-noise sampling of DC/AC signals with programmable integration times. Use Value: Selectable 6.9 Hz (200 nVRMS) or 880 Hz (2 µVRMS) modes allow optimized trade-off between noise floor and update rate per range. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction compensation and thermocouple linearization in industrial process controllers using Pt100 or Type-K sensors. IC Role / Device Role / Timing Role: Differential ADC digitizing low-level thermocouple mV outputs referenced to precision RTD-based cold-junction voltage. Use Value: Differential reference and input support ratiometric measurement; 0.1 V min VREF enables use with low-dropout reference ICs. |
Use Scenario: Multi-channel sensor monitoring in test equipment requiring synchronized, high-fidelity sampling of analog transducers. IC Role / Device Role / Timing Role: High-throughput ADC operating at 3.5 kHz with 21-bit effective resolution, driven by external fO for deterministic timing. Use Value: No-latency architecture permits interleaved channel sampling with zero inter-conversion delay - simplifies firmware synchronization. |
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 |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 30 kSPS max, SPI interface, integrated PGA (1–128×), but higher typical noise (1.5 µVRMS at 10 kSPS) and no built-in 50/60 Hz rejection. | Preferred where programmable gain and higher throughput are needed; less suitable for ultra-low-noise 50/60 Hz–contaminated environments without external filtering. | Select ADS1256IDBT when gain flexibility and faster sampling outweigh need for embedded line-frequency rejection. |
| LTC2410CGN#TRPBF | 24-bit, fixed 7.5 Hz output rate, 1.5 µVRMS noise, no speed/resolution programming, identical pinout and interface but lacks SDI/EXT programmability. | Used in cost-sensitive, fixed-speed applications where 7.5 Hz suffices and design simplicity is prioritized over configurability. | Choose LTC2410CGN#TRPBF only if fixed low-speed operation is acceptable and feature reduction justifies lower BOM cost. |
Compared with ADS1256IDBT and LTC2410CGN#TRPBF, the LTC2440IGN#TRPBF uniquely combines programmable speed/noise, built-in 50/60 Hz rejection, and no-latency operation - making it optimal for metrology systems requiring adaptive resolution without sacrificing accuracy or introducing pipeline delay.
Availability
LTC2440IGN#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, direct temperature measurement, and high-speed data acquisition requiring stable component supply across industrial temperature ranges.
Supply support for LTC2440IGN#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) acquired Linear Technology in 2017 and maintains its high-precision analog product lines with rigorous metrology-grade validation and long-term industrial support.
The LTC2440IGN#TRPBF belongs to ADI's precision delta-sigma ADC family designed for metrology, industrial instrumentation, and test equipment demanding 24-bit accuracy, low drift, and configurable noise-performance trade-offs.
FAQ
What is the maximum output data rate of the LTC2440IGN#TRPBF?
The LTC2440IGN#TRPBF achieves a maximum output rate of 3.5 kHz when configured with OSR = 256 and driven by an external oscillator. At this rate, it delivers 21-bit effective resolution with 2.5 µVRMS noise. The device maintains full 24-bit no-missing-codes performance down to 6.9 Hz, where noise drops to 200 nVRMS with simultaneous 50/60 Hz rejection. This wide programmable range is enabled by its proprietary delta-sigma architecture and on-chip decimation filter.
Does the LTC2440IGN#TRPBF require external calibration components?
No, the LTC2440IGN#TRPBF performs continuous internal offset and full-scale calibration every conversion cycle without user intervention. This eliminates the need for external trim pots, calibration DACs, or factory calibration routines. The calibration is transparent to the host system and does not introduce latency or disrupt the conversion/data-output cycle. As a result, the LTC2440IGN#TRPBF maintains ±5 µV offset error and ±5 ppm INL over temperature and time without external support circuitry.
How does the LTC2440IGN#TRPBF achieve 50/60 Hz rejection at 6.9 Hz output rate?
The LTC2440IGN#TRPBF achieves simultaneous 50 Hz and 60 Hz rejection at its 6.9 Hz output rate through inherent notch filtering in its delta-sigma modulator and decimating FIR filter structure. When SDI is tied HIGH, the device configures OSR = 32768, resulting in a 6.9 Hz output rate and 200 nVRMS noise - a setting explicitly characterized for 50/60 Hz rejection in the datasheet. This is not post-processing; it is a fundamental property of the selected oversampling ratio and internal filter coefficients.
Is the LTC2440IGN#TRPBF pin-compatible with other Linear Technology ADCs?
Yes, the LTC2440IGN#TRPBF is pin-compatible with the LTC2410 in the narrow 16-lead SSOP package. All signal pins (GND, VCC, REF+, REF–, IN+, IN–, SDI, EXT, CS, SDO, SCK, fO, BUSY) occupy identical positions and share identical electrical behavior for basic operation. This allows direct replacement in existing LTC2410 designs to add speed/resolution programmability and improved noise performance without PCB layout changes.
What power supply bypassing is required for stable operation of the LTC2440IGN#TRPBF?
The LTC2440IGN#TRPBF requires a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor placed directly between VCC (Pin 2) and GND (Pin 1), with both capacitors located within 1 mm of their respective pins. This dual-capacitor network suppresses low- and high-frequency supply noise critical for achieving specified 200 nVRMS noise performance. Additional 0.01 µF ceramics may be added near Pins 8, 9, and 16 for enhanced high-frequency decoupling in noisy environments.
LTC2440IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 3.5k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2440IGN#TRPBF FAQ
1.How can I place an order for LTC2440IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2440IGN#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 LTC2440IGN#TRPBF reliable?
The price and inventory of LTC2440IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2440IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2440IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2440IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2440IGN#TRPBF?
LTC2440IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2440IGN#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 LTC2440IGN#TRPBF?
For technical support, including LTC2440IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2440IGN#TRPBF requirements.
6.How does Aetrix verify that LTC2440IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2440IGN#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 LTC2440IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2440IGN#TRPBF?
All LTC2440IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2440IGN#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 LTC2440IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC2440IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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