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Analog Devices Inc. LTC2449IUHF#PBF
- Part No.:
- LTC2449IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2449IUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
LTC2449IUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) no-latency delta-sigma ADC with selectable speed/resolution, 200nVRMS noise at 13.8Hz, simultaneous 50Hz/60Hz rejection, and internal oscillator - used in high-precision industrial data acquisition systems requiring channel-scanned DC measurements with guaranteed modulator stability.
For engineers reviewing the LTC2449IUHF#PBF datasheet, LTC2449IUHF#PBF pinout, LTC2449IUHF#PBF application, or LTC2449IUHF#PBF equivalent, key selection criteria include RMS noise vs. output rate trade-offs (6.9Hz to 8kHz), differential input/reference common-mode range (GND to VCC), autosleep current (20µA), and MUXOUT/ADCIN interface capability for external buffering.
Technical Context
The LTC2449IUHF#PBF implements a proprietary third-order delta-sigma modulator with decimating FIR filter and per-conversion auto-calibration of offset and full-scale. It supports both internal and external oscillator modes (FO pin), enabling output rates up to 8kHz with external fO and 7kHz in 2X speed mode.
Its 4-wire SPI-compatible interface uses SDI for dynamic channel/speed/resolution selection and SDO for 32-bit output (24-bit result + status bits). The MUXOUTP/ADCINP/MUXOUTN/ADCINN pins enable insertion of an external gain/buffer stage between multiplexer and ADC core - a feature distinguishing LTC2449 from LTC2448.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| RMS Noise | 200nV at 13.8Hz output rate - enables sub-µV-level DC measurement resolution in low-speed precision applications. |
| INL Error | ±0.0005% of VREF - ensures accurate absolute voltage measurement without calibration-dependent linearity correction. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - minimizes zero-point drift in weigh scales and sensor front-ends. |
| Input Channels | 16 single-ended or 8 differential - supports flexible signal routing with GND-to-VCC common-mode range independent of reference. |
| Reference Range | 0.1V to VCC differential - allows use of low-voltage references to improve INL while maintaining full 24-bit dynamic range. |
| Supply Current | 8–11mA active, 20µA autosleep - enables battery-operated portable DVMs and low-power sensor nodes. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Ground reference | Seven dedicated ground pins minimize ground bounce and support low-noise analog layout; all must connect to common ground plane. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready for readout - enables precise timing control without polling. |
| EXT (Pin 3) | SCK mode select | LOW = external clock mode (SCK input); HIGH = internal clock mode (SCK output) - configures serial interface without register writes. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; supports bipolar input range (–0.5×VREF to +0.5×VREF) when paired with CH0–CH15. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Programmable as single-ended or differential pairs; each accepts GND–0.3V to VCC+0.3V absolute voltage - enables direct thermocouple or bridge sensor connection. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Drive external buffer/amplifier; isolated from ADC core to prevent loading - enables gain/conditioning before digitization without degrading noise or linearity. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Accept conditioned signal from external buffer; referenced to same COM/REF system - preserves calibrated accuracy even with external circuitry. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Support 0.1V to VCC differential span with GND-to-VCC common-mode - allows ratiometric sensing and eliminates need for precision reference ICs. |
| SDI/SDO/SCK/CS (Pins 34,37,38,36) | 4-wire serial interface | Compatible with standard SPI timing; SDI selects next channel/speed before conversion; SDO outputs 32-bit frame with EOC/SIG/MSB/status bits. |
Key Features
| Feature | Design Value |
|---|---|
| No latency delta-sigma architecture | First conversion after channel/speed change is fully accurate - eliminates settling delays in multiplexed sensor arrays. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction - maintains ±5µV offset and ±0.0005% INL over temperature and supply variation without user intervention. |
| MUXOUT/ADCIN interface | External buffer insertion point with transparent calibration - enables programmable gain without sacrificing DC accuracy or noise performance. |
| Simultaneous 50Hz/60Hz rejection | Guaranteed at 6.9Hz output rate - eliminates mains interference in laboratory instruments and industrial controllers without external notch filters. |
| Autosleep mode | 20µA quiescent current at 6.9Hz - extends battery life in portable 6½-digit DVMs and handheld test equipment. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-resolution load cell measurement in commercial bench scales with automatic range switching based on weight magnitude. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing mV-level bridge outputs; uses MUXOUT/ADCIN to insert programmable gain amplifier for auto-ranging. Use Value: 200nVRMS noise enables 0.1mg resolution at 13.8Hz; per-conversion calibration maintains ±0.0005% INL across temperature drift and supply variation. | Use Scenario: Portable handheld multimeter performing DC voltage, resistance, and current measurements with automatic range selection and autoranging. IC Role / Device Role / Timing Role: Core ADC providing 24-bit digitization with simultaneous 50/60Hz rejection at 6.9Hz - critical for stable readings in noisy lab environments. Use Value: No-latency operation ensures immediate valid reading after range change; autosleep reduces average current to <20µA during standby intervals. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction compensation and thermocouple voltage digitization in industrial process controllers with ±0.1°C accuracy requirement. IC Role / Device Role / Timing Role: ADC interfacing directly to thermocouple via cold-junction sensor; uses differential inputs and COM pin for pseudo-differential configuration. Use Value: GND-to-VCC common-mode range accommodates thermocouple offsets; 2µV offset error ensures sub-degree C accuracy without software correction. | Use Scenario: Multi-channel vibration monitoring system sampling accelerometer outputs at up to 8kHz for FFT-based fault detection in rotating machinery. IC Role / Device Role / Timing Role: 16-channel scan-capable ADC operating in 2X speed mode with external 10MHz oscillator on FO pin. Use Value: 8kHz output rate supports Nyquist sampling of 4kHz signals; 8-channel differential scan at 500Hz enables real-time multi-point analysis without FPGA preprocessing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2448IUHF#PBF | No MUXOUT/ADCIN pins; 280nVRMS noise at 6.9Hz (vs. 200nV for LTC2449) | Same 16-channel architecture but lacks external buffering interface - suitable where gain is applied post-ADC or integrated into sensor module. | Select LTC2448 when external signal conditioning is unnecessary and cost optimization is prioritized over lowest noise. |
| ADS1258IPWR | 24-bit, 16-channel, but fixed 30kSPS max rate; no simultaneous 50/60Hz rejection; requires external reference and clock. | Higher throughput but less flexible resolution/speed trade-off; no built-in auto-calibration - demands more system-level calibration effort. | Choose ADS1258 only when fixed high-speed sampling dominates over ultra-low-noise DC precision and mains rejection. |
Compared with LTC2448IUHF#PBF and ADS1258IPWR, the LTC2449IUHF#PBF uniquely combines MUXOUT/ADCIN flexibility, 200nVRMS noise at low speeds, and guaranteed simultaneous 50/60Hz rejection - making it optimal for battery-powered precision instruments requiring field-replaceable sensor interfaces and minimal firmware calibration overhead.
Availability
LTC2449IUHF#PBF 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, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for LTC2449IUHF#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2449IUHF#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for industrial and instrumentation applications demanding ultra-low noise, guaranteed stability, and seamless multiplexed channel scanning without latency penalties.
FAQ
What is the maximum output data rate achievable with the LTC2449IUHF#PBF?
The LTC2449IUHF#PBF achieves up to 8kHz output rate when using an external oscillator (fEOSC = 10MHz) in 2X speed mode. With internal oscillator only, maximum rate is 7kHz. This is confirmed in the Electrical Characteristics table and Timing Characteristics section of the official datasheet, where tCONV and fISCK values define the upper limit under specified conditions.
Does the LTC2449IUHF#PBF require external components for basic operation?
No, the LTC2449IUHF#PBF operates with no external components for core functionality: it includes an internal oscillator, per-conversion auto-calibration, and integrated reference buffer. Only VCC bypassing (10µF tantalum + 0.1µF ceramic) and proper grounding of all GND pins are mandatory. External components like buffers or gain stages are optional and enabled only via MUXOUT/ADCIN pins.
How does the MUXOUT/ADCIN interface on the LTC2449IUHF#PBF improve system accuracy?
The MUXOUT/ADCIN interface on the LTC2449IUHF#PBF allows insertion of an external op-amp or instrumentation amplifier between multiplexer and ADC core. Because the LTC2449IUHF#PBF performs per-conversion offset and full-scale calibration, it automatically nulls the offset and gain errors of the external buffer - preserving the ±5µV offset and ±0.0005% INL specifications without additional system-level calibration.
Can the LTC2449IUHF#PBF reject 50Hz and 60Hz interference simultaneously?
Yes, the LTC2449IUHF#PBF guarantees simultaneous 50Hz and 60Hz rejection at its 6.9Hz output rate, as explicitly stated in the Features and Applications sections of the datasheet. This is achieved through inherent delta-sigma filter notch placement and does not require external filtering or firmware configuration.
What is the meaning of "No Latency" in the LTC2449IUHF#PBF product description?
"No Latency" means that the first conversion result after any channel, speed, or resolution change is fully accurate - there is no filter settling delay or invalid data cycles. Unlike conventional delta-sigma ADCs requiring multiple dummy conversions after reconfiguration, the LTC2449IUHF#PBF delivers a valid 24-bit result immediately, enabling true real-time multiplexed measurement in dynamic sensor arrays.
LTC2449IUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 8k
- Number of Inputs:
- 8, 16
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2449IUHF#PBF FAQ
1.How can I place an order for LTC2449IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2449IUHF#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 LTC2449IUHF#PBF reliable?
The price and inventory of LTC2449IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2449IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2449IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2449IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2449IUHF#PBF?
LTC2449IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2449IUHF#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 LTC2449IUHF#PBF?
For technical support, including LTC2449IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2449IUHF#PBF requirements.
6.How does Aetrix verify that LTC2449IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2449IUHF#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 LTC2449IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2449IUHF#PBF?
All LTC2449IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2449IUHF#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 LTC2449IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2449IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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