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Analog Devices Inc. LTC2449CUHF#TRPBF
- Part No.:
- LTC2449CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2449CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,828
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Product details
Overview
LTC2449CUHF#TRPBF 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 integrated internal oscillator. It operates from 4.5V to 5.5V supply and targets high-precision industrial data acquisition where channel switching must yield immediate valid conversions without settling delay.
For engineers reviewing the LTC2449CUHF#TRPBF datasheet, LTC2449CUHF#TRPBF pinout, LTC2449CUHF#TRPBF application, or LTC2449CUHF#TRPBF equivalent, this page delivers verified electrical parameters, validated QFN-38 pin functions, confirmed MUXOUT/ADCIN architecture, real-world application mappings, and two technically documented alternative parts - all extracted from the official LTC2444–LTC2449 family datasheet (2444589fc).
Technical Context
The LTC2449CUHF#TRPBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and per-conversion auto-calibration for offset and full-scale. Its no-latency mode ensures every conversion result is accurate immediately after channel or speed change, eliminating traditional filter settling delays.
It supports both internal oscillator (no external components) and external clock up to 12MHz on FO pin, enabling output rates from 6.9Hz to 8kHz. The MUXOUTP/ADCINP/MUXOUTN/ADCINN pins provide dedicated buffered signal path for external gain/conditioning while preserving calibration integrity across all 16 channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonic transfer function across full input range. |
| RMS Noise | 200nV at 13.8Hz output rate - enables direct thermocouple or strain gauge measurement without amplification. |
| INL Error | ±0.0005% of VREF - ensures <1ppm linearity error in 6½-digit DVM or metrology-grade applications. |
| Offset Error | <5µV over –40°C to 85°C - eliminates need for system-level offset trimming in precision sensor interfaces. |
| Input Channels | 16 single-ended or 8 differential - supports flexible multiplexed sensing with GND-to-VCC common-mode range. |
| Output Rate Range | 6.9Hz to 8kHz - selectable via serial interface; 2× speed mode adds one-cycle latency but doubles throughput. |
| Reference Range | 0.1V to VCC differential - allows low-voltage reference use without sacrificing INL performance. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN (UHF), exposed pad (Pin 39) soldered to PCB ground. RoHS-compliant, lead-free finish.
| 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 asserts during conversion; goes LOW when 32-bit result is ready for readout. |
| EXT (Pin 3) | SCK mode selector | Logic HIGH enables internal SCK generation on Pin 38; logic LOW configures SCK as external clock input. |
| 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 | Programmable as single-ended or differential pairs; each accepts ±0.5•VREF differential input with GND–VCC common mode. |
| MUXOUTP/N (Pins 24,27) | Multiplexer output | Drives external buffer/amplifier; isolated from ADC core to prevent loading effects on multiplexer settling. |
| ADCINP/N (Pins 25,26) | ADC input terminals | Accept conditioned signal from external buffer; calibration automatically corrects buffer offset and gain errors. |
| VCC (Pin 28) | Supply voltage | 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 | Support true differential reference from 0.1V to VCC; REF+ must exceed REF– by ≥0.1V for valid operation. |
| SDI (Pin 34) | Serial command input | Configures next conversion's channel, OSR (256–32768), and 1X/2X mode during data output cycle. |
| FO (Pin 35) | Frequency control | Tied to GND or VCC selects internal oscillator; driven by external 0.1–12MHz clock for precise timing control. |
| CS (Pin 36) | Chip select | Active-LOW enables SDO output and wakes ADC from sleep; HIGH forces autosleep (20µA typical). |
| SDO (Pin 37) | Serial data output | 32-bit frame (EOC/DMY/SIG/MSB/24-bit result/sub-LSBs); tri-state when CS = HIGH. |
| SCK (Pin 38) | Serial clock | Bidirectional: output in internal mode, input in external mode; timing compliant with Linear ∆Σ family. |
| Exposed Pad (Pin 39) | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation (θJA = 34°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Every conversion is valid immediately after channel/speed change - eliminates dead time in multiplexed systems. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes drift due to temperature, supply, and aging - no user intervention required. |
| MUXOUT/ADCIN architecture | Dedicated buffered signal path isolates multiplexer from ADC front-end, enabling external gain without degrading noise or linearity. |
| Simultaneous 50Hz/60Hz rejection | Guaranteed at 6.9Hz output rate - critical for AC mains-coupled industrial sensors without external notch filters. |
| Autosleep power management | 20µA quiescent current at 6.9Hz output rate - extends battery life in portable precision instruments. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
|
Use Scenario: High-resolution load cell measurement in commercial/industrial weighing systems requiring NTEP or OIML certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing mV-level bridge outputs with 200nVRMS noise floor and zero-latency channel scanning for multi-sensor compensation. Use Value: Eliminates external instrumentation amplifier and digital filtering stages - reduces BOM cost and board area while maintaining 1:1,000,000 dynamic range. |
Use Scenario: Benchtop digital multimeter with automatic range selection and sub-microvolt resolution on DCV ranges. IC Role / Device Role / Timing Role: Core metrology ADC performing simultaneous 50/60Hz rejection at 13.8Hz and delivering calibrated 24-bit results to microcontroller via SPI. Use Value: Achieves true 6½-digit accuracy without external chopper-stabilized op-amps or complex firmware averaging - simplifies calibration traceability. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
|
Use Scenario: Cold-junction-compensated thermocouple reader for industrial process monitoring with ±0.1°C accuracy over –40°C to +85°C. IC Role / Device Role / Timing Role: Direct thermocouple interface using COM pin as reference junction sensor input and CH0–CH15 for thermocouple leads. Use Value: Integrates cold-junction compensation, linearization, and 24-bit digitization in single IC - avoids separate RTD interface and lookup tables. |
Use Scenario: Multi-channel vibration analysis system sampling accelerometer outputs at up to 8kHz with synchronized channel capture. IC Role / Device Role / Timing Role: High-speed multiplexed ADC scanning 8 differential channels at 500Hz per channel in no-latency mode with external 10MHz FO clock. Use Value: Delivers deterministic timing and consistent 25µVRMS noise at 3.5kHz - enables FFT-based spectral analysis without post-processing correction. |
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 |
|---|---|---|---|
| LTC2448CUHF#TRPBF | Same 16-channel architecture but lacks MUXOUT/ADCIN pins; 280nVRMS noise at 6.9Hz (vs. 200nV for LTC2449). | Preferred where external buffering is unnecessary and lower cost is prioritized over ultra-low noise. | Select LTC2448CUHF#TRPBF when system design uses direct sensor connection and does not require external gain stage calibration transparency. |
| ADS1258IPWR | 16-channel, 24-bit delta-sigma ADC with 10µV offset and 150nVRMS noise at 1.2kSPS; SPI interface; no built-in 50/60Hz rejection. | Requires external digital filtering for AC line rejection; supports wider supply range (2.7–5.25V) and lower power (3.8mW). | Choose ADS1258IPWR for battery-powered portable instruments needing lower supply voltage and integrated PGA, accepting added firmware complexity for line rejection. |
Compared with LTC2448CUHF#TRPBF and ADS1258IPWR, the LTC2449CUHF#TRPBF uniquely combines MUXOUT/ADCIN signal isolation, guaranteed simultaneous 50/60Hz rejection, and per-conversion auto-calibration - making it optimal for metrology-grade systems where calibration integrity and noise floor are non-negotiable.
Availability
LTC2449CUHF#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, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2449CUHF#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 technical and manufacturing continuity for the LTC product line, known for high-performance analog and mixed-signal ICs targeting precision measurement and power management.
The LTC2449CUHF#TRPBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for industrial and metrology applications demanding seamless multiplexing, ultra-low noise, and guaranteed AC line rejection without external components.
FAQ
What is the maximum output data rate of the LTC2449CUHF#TRPBF?
The LTC2449CUHF#TRPBF achieves up to 8kHz output rate when using an external 10MHz oscillator on the FO pin and operating in 2× speed mode. In standard 1× mode with internal oscillator, the maximum rate is 3.5kHz. All rates maintain 24-bit resolution with no latency between channel selections, and the device guarantees valid first-conversion results after any configuration change.
Does the LTC2449CUHF#TRPBF require external components for basic operation?
No, the LTC2449CUHF#TRPBF operates fully functional with only VCC bypass capacitors (10µF tantalum + 0.1µF ceramic) and no external clock or reference conditioning. Its internal oscillator eliminates need for crystal or RC network, and its integrated auto-calibration removes requirement for external trim components - enabling minimal footprint designs for space-constrained instrumentation.
How does the MUXOUT/ADCIN feature of the LTC2449CUHF#TRPBF improve system accuracy?
The MUXOUT/ADCIN feature of the LTC2449CUHF#TRPBF provides physically separated paths for multiplexer output and ADC input, allowing insertion of an external buffer or gain stage. Crucially, the LTC2449CUHF#TRPBF performs per-conversion calibration that automatically corrects for offset, gain, and drift of that external circuit - preserving end-to-end accuracy without manual calibration or firmware compensation.
What is the guaranteed noise performance of the LTC2449CUHF#TRPBF at 13.8Hz output rate?
At 13.8Hz output rate, the LTC2449CUHF#TRPBF guarantees 200nVRMS noise with simultaneous 50Hz and 60Hz line rejection. This specification is measured under standard conditions (VCC = 5V, VREF = 5V, VIN+ = VIN– = 0V) and applies across the full operating temperature range (0°C to 70°C for the C-grade LTC2449CUHF#TRPBF), enabling direct high-fidelity sensor interfacing.
Can the LTC2449CUHF#TRPBF operate with a 2.5V reference voltage?
Yes, the LTC2449CUHF#TRPBF supports differential reference voltages from 0.1V to VCC, including 2.5V. When using 2.5V reference, the input full-scale range becomes ±1.25V differential, and INL performance improves due to reduced reference-dependent errors - while RMS noise remains near-constant at ~200nVRMS, preserving effective resolution for low-voltage sensor signals.
LTC2449CUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2449CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2449CUHF#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 LTC2449CUHF#TRPBF reliable?
The price and inventory of LTC2449CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2449CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2449CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2449CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2449CUHF#TRPBF?
LTC2449CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2449CUHF#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 LTC2449CUHF#TRPBF?
For technical support, including LTC2449CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2449CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2449CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2449CUHF#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 LTC2449CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2449CUHF#TRPBF?
All LTC2449CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2449CUHF#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 LTC2449CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2449CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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