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Analog Devices Inc. LTC2449CUHF#PBF
- Part No.:
- LTC2449CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2449CUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,217
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Product details
Overview
LTC2449CUHF#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 output rate, simultaneous 50Hz/60Hz rejection, and integrated internal oscillator - used in high-precision weight scales, auto-ranging DVMs, and direct temperature measurement systems.
For engineers reviewing the LTC2449CUHF#PBF datasheet, LTC2449CUHF#PBF pinout, LTC2449CUHF#PBF application, or LTC2449CUHF#PBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, <5µV offset over –40°C to 85°C, 0.0005% INL, autosleep mode enabling 20µA operation at 6.9Hz, and differential input/reference with GND-to-VCC common-mode range.
Technical Context
The LTC2449CUHF#PBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and continuous on-the-fly offset/full-scale autocalibration - ensuring zero drift impact on DC accuracy across temperature, supply, and time. Its no-latency architecture guarantees first-conversion validity after any channel, speed, or resolution change.
It supports both internal oscillator (no external components) and external fO up to 12MHz, enabling output rates from 6.9Hz to 8kHz. The 4-wire SPI-compatible interface uses BUSY as conversion-ready framing signal and allows seamless 1X/2X speed mode switching without settling penalties or data redundancy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - ensures monotonic transfer function for precision metrology applications. |
| INL | ±0.0005% of full scale - enables 16-bit+ effective linearity in high-gain sensor interfaces without post-calibration. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - eliminates need for system-level offset trimming in low-drift designs. |
| RMS Noise | 200nV at 13.8Hz with simultaneous 50/60Hz rejection - supports direct thermocouple or RTD digitization without external notch filtering. |
| Output Rate Range | 6.9Hz to 8kHz (external fO) - provides scalable throughput from ultra-low-noise DC measurements to high-speed multiplexed acquisition. |
| Input Configuration | 16 single-ended or 8 differential channels with GND-to-VCC common-mode range - simplifies interfacing to unbuffered sensors and industrial transducers. |
| Supply Current | 8–11mA active, 20µA in autosleep at 6.9Hz - enables battery-powered portable instrumentation with multi-day runtime. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed pad (Pin 39 = GND). Requires soldering 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 improve PSRR during high-speed multiplexing. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal confirms ongoing conversion; transitions LOW when 32-bit result is ready for readout. |
| EXT (Pin 3) | SCK mode select | Logic HIGH enables internal SCK generation; LOW configures SCK as external clock input for synchronous host control. |
| COM (Pin 7) | Common negative input | Shared IN– node for all single-ended configurations; supports rail-to-rail common-mode voltage (GND to VCC). |
| CH0–CH15 (Pins 8–23) | Analog input channels | 16 fully programmable inputs supporting mixed single-ended/differential pairing without reconfiguration overhead. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Drive external buffer/amplifier stage; enable gain/conditioning before ADC input while preserving autocalibration integrity. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Accept buffered signal from MUXOUT; isolate ADC front-end from multiplexer charge injection and crosstalk. |
| VCC (Pin 28) | Positive supply | 4.5V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass for stable high-resolution conversion. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Accept 0.1V–VCC differential reference; common-mode range spans GND to VCC independent of VREF. |
| SDI (Pin 34) | Serial data input | Configures next conversion's channel, OSR, and 1X/2X mode during data output cycle - enables dynamic reconfiguration. |
| FO (Pin 35) | Frequency control | Tie to GND or VCC to select internal oscillator; connect external crystal/clock (0.1–12MHz) for precise timing control. |
| CS (Pin 36) | Chip select | Active-LOW wake-up signal; initiates data output and exits autosleep - controls power state without interrupt latency. |
| SDO (Pin 37) | Serial data output | 3-state output delivering 32-bit frame (status + 24-bit result + 5 sub-LSBs); Hi-Z when CS = HIGH for bus sharing. |
| SCK (Pin 38) | Serial clock | Bidirectional: output in internal mode, input in external mode - eliminates need for separate clock generator in compact systems. |
| Exposed Pad (Pin 39) | Thermal & electrical ground | Must be soldered to PCB ground plane; critical for thermal dissipation (θJA = 34°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | First result after channel/speed/resolution change is fully accurate - eliminates dead time and settling delays in multiplexed systems. |
| Continuous autocalibration | Per-conversion offset and full-scale correction - maintains ±5µV offset and ±10ppm FS error over temperature and supply variation. |
| Simultaneous 50Hz/60Hz rejection | Hardware-filtered at 6.9Hz output rate - removes mains interference without software averaging or external notch filters. |
| MUXOUT/ADCIN interface | Enables external gain/buffer between multiplexer and ADC core - preserves 24-bit integrity while supporting high-impedance or noisy sensors. |
| Autosleep mode | Reduces current to 20µA at 6.9Hz output rate - extends battery life in portable DVMs and handheld test equipment. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-accuracy load cell readout in commercial bench scales with 1:1,000,000 resolution requirement and AC mains noise environment. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing differential bridge output; performs simultaneous 50/60Hz rejection at 13.8Hz rate to suppress ambient EMI. Use Value: Eliminates need for external digital filtering or dual-supply op-amps - achieves 200nVRMS noise floor and <5µV offset without calibration firmware. | Use Scenario: Portable handheld multimeter requiring automatic range switching, 6½-digit display, and battery operation >24 hours. IC Role / Device Role / Timing Role: Core metrology ADC acquiring voltage/current/resistance with programmable OSR from 6.9Hz (ultra-low noise) to 4kHz (fast response). Use Value: Autosleep mode cuts active current to 20µA at lowest speed - enables multi-day runtime on AA cells while maintaining 24-bit linearity. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Industrial thermocouple monitoring system with cold-junction compensation and ±0.1°C accuracy over –40°C to +125°C. IC Role / Device Role / Timing Role: Direct digitization of µV-level thermocouple EMF using differential input and internal reference; rejects thermal EMF drift via autocalibration. Use Value: 0.0005% INL and <5µV offset ensure absolute accuracy without per-sensor lookup tables - reduces BOM cost and firmware complexity. | Use Scenario: Multi-channel vibration analysis in predictive maintenance hardware sampling 8 sensor inputs at ≥500Hz per channel. IC Role / Device Role / Timing Role: 16-channel scan engine performing 8 differential conversions at 500Hz total - enabled by no-latency architecture and internal reset between conversions. Use Value: Guarantees valid first sample after channel switch - avoids data loss or interpolation artifacts in real-time FFT processing pipelines. |
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 |
|---|---|---|---|
| ADS1258IRHBT | 24-bit, 8-channel, 125kSPS max, no internal oscillator, requires external clock and reference buffering | Lacks simultaneous 50/60Hz rejection and autosleep; higher active current (12mA) | Preferred when maximum throughput >10kHz is required and external clocking infrastructure exists. |
| LTC2418CGN#PBF | 24-bit, 8-channel, 15SPS max, no MUXOUT/ADCIN, smaller 20-pin SSOP package | Lower noise (150nVRMS) only at sub-10Hz rates; no 2X speed mode or external fO support | Selected for space-constrained, ultra-low-power DC measurement where 8kHz capability is unnecessary. |
Compared with ADS1258IRHBT and LTC2418CGN#PBF, the LTC2449CUHF#PBF uniquely combines 8kHz multiplexing, built-in 50/60Hz rejection, and autosleep - making it optimal for portable, mains-immune, battery-operated precision instruments without external timing or filtering components.
Availability
LTC2449CUHF#PBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, direct temperature measurement systems, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2449CUHF#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, serving industrial, automotive, communications, and healthcare markets.
The LTC2449CUHF#PBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC family, engineered for metrology-grade accuracy, zero-latency multiplexing, and robust operation in electrically noisy environments - targeting test & measurement, industrial process control, and scientific instrumentation.
FAQ
What is the maximum output data rate of the LTC2449CUHF#PBF?
The LTC2449CUHF#PBF supports up to 8kHz output rate when using an external oscillator (fO ≤ 12MHz) in 2X speed mode. With internal oscillator only, maximum rate is 7kHz. At 8kHz, the device exhibits one-cycle latency but retains full DC accuracy - verified across temperature and supply variations per datasheet Table 5.
Does the LTC2449CUHF#PBF require external components for basic operation?
No, the LTC2449CUHF#PBF operates with no external timing components thanks to its integrated oscillator. Only mandatory external parts are VCC bypass capacitors (10µF tantalum + 0.1µF ceramic) and proper grounding of the exposed pad (Pin 39). Reference and input filtering are application-dependent but not required for functional operation.
How does the MUXOUT/ADCIN feature improve system accuracy in the LTC2449CUHF#PBF?
The MUXOUT/ADCIN pins in the LTC2449CUHF#PBF allow insertion of an external buffer or gain amplifier between the multiplexer and ADC core. Because the LTC2449CUHF#PBF performs continuous autocalibration, it automatically corrects for offset and gain errors introduced by that external stage - preserving end-to-end 24-bit linearity without manual calibration or trimming.
What is the guaranteed integral nonlinearity (INL) specification for the LTC2449CUHF#PBF?
The LTC2449CUHF#PBF guarantees ±0.0005% INL over the full operating temperature range (0°C to 70°C for the 'C' grade), equivalent to ±3.3 ppm of full scale. This is measured per JEDEC JESD22-A108 with a straight-line fit through actual endpoints and applies to all 24-bit codes with no missing codes.
Can the LTC2449CUHF#PBF reject both 50Hz and 60Hz interference simultaneously?
Yes, the LTC2449CUHF#PBF provides simultaneous 50Hz and 60Hz rejection at its 6.9Hz output rate - implemented in hardware via its delta-sigma modulator and decimation filter. This rejection is guaranteed across temperature and supply voltage, eliminating the need for software-based notch filtering or dual-frequency adaptive algorithms.
LTC2449CUHF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2449CUHF#PBF FAQ
1.How can I place an order for LTC2449CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2449CUHF#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 LTC2449CUHF#PBF reliable?
The price and inventory of LTC2449CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2449CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2449CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2449CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2449CUHF#PBF?
LTC2449CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2449CUHF#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 LTC2449CUHF#PBF?
For technical support, including LTC2449CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2449CUHF#PBF requirements.
6.How does Aetrix verify that LTC2449CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2449CUHF#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 LTC2449CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2449CUHF#PBF?
All LTC2449CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2449CUHF#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 LTC2449CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2449CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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