My Inquiry
My Account
Analog Devices Inc. LTC2447IUHF#PBF
- Part No.:
- LTC2447IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2447IUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2447IUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel delta-sigma ADC with selectable differential reference inputs and integrated multiplexer for ratiometric sensor digitization. It delivers 200nVRMS noise at 13.8Hz, 0.0005% INL, <5µV offset over –40°C to 85°C, and supports up to 8kHz output rate in 2× mode-used in high-precision industrial weighing, pressure transducers, and RTD-based temperature measurement systems.
For engineers reviewing the LTC2447IUHF#PBF datasheet, LTC2447IUHF#PBF pinout, LTC2447IUHF#PBF application, or LTC2447IUHF#PBF equivalent, key selection considerations include its 38-lead QFN package, MUXOUT/ADCIN interface for external buffering, no-latency conversion architecture, guaranteed modulator lock-up immunity, and five independent differential reference input sets enabling simultaneous multi-sensor ratiometric acquisition without recalibration overhead.
Technical Context
The LTC2447IUHF#PBF implements a proprietary third-order delta-sigma modulator with decimating FIR filter and on-the-fly auto-calibration of offset and full-scale error every conversion cycle. Its 4-wire serial interface supports both internal and external SCK modes, with BUSY pin indicating real-time conversion status and CS-controlled sleep/wake transitions.
It features a 19-input/4-output analog multiplexer supporting four differential or eight single-ended input configurations, plus five differential reference inputs-including four channel-paired sets (VREF01±, VREF23±, VREF45±, VREF67±) and one global reference (VREFG±). The MUXOUTP/ADCINP/MUXOUTN/ADCINN signal path enables external gain/buffering while preserving calibration integrity across all channels.
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 | 200nVRMS at 13.8Hz with 50/60Hz rejection-enables sub-µV-level signal resolution in low-speed precision sensing. |
| Integral Nonlinearity | ±15ppm of VREF-translates to ±0.0005% full-scale error, critical for metrology-grade accuracy in weight scales and lab instruments. |
| Offset Error | <5µV over –40°C to 85°C-eliminates need for system-level offset trimming in embedded industrial controllers. |
| Output Rate | Up to 8kHz in 2× mode-supports high-speed scanning of multiple bridge/RTD sensors without inter-channel settling delay. |
| Reference Inputs | Five selectable differential reference pairs-allows independent ratiometric scaling per sensor group (e.g., four RTDs + one thermocouple). |
| Supply Current | 8mA typical in conversion mode, 20µA in autosleep at 6.9Hz-enables battery-powered portable instrumentation with extended runtime. |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). All seven ground pins (1, 4, 5, 6, 31, 32, 33) must be soldered to PCB ground plane for optimal noise immunity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Power and signal ground reference | Multiple dedicated ground connections minimize ground bounce and improve PSRR in high-resolution ADC operation. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal confirms ongoing conversion; transitions LOW when 32-bit result is ready for readout-enables interrupt-driven firmware control. |
| MUXOUTP / MUXOUTN (Pins 24,27) | Positive/negative multiplexer output | Drives external buffer/amplifier for selected IN+/IN– channel-decouples multiplexer switching noise from ADC front-end. |
| ADCINP / ADCINN (Pins 25,26) | Buffered ADC input terminals | Accept conditioned signals from MUXOUT outputs; calibration automatically compensates for external amplifier offset and gain drift. |
| VREF01± to VREF67± (Pins 10–11,14–15,18–19,22–23) | Differential reference inputs | Four independent reference pairs enable simultaneous ratiometric digitization of up to four sensor types without shared reference crosstalk. |
| VREFG± (Pins 29–30) | Global reference input | Single reference pair usable across any input channel via software configuration-simplifies design for mixed-sensor systems. |
| CH0–CH7 (Pins 8,9,12,13,16,17,20,21) | Analog input channels | Configurable as differential pairs or single-ended inputs relative to COM (Pin 7)-supports flexible sensor interfacing including 4-wire RTDs and Wheatstone bridges. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion mode | Each output corresponds precisely to the immediately preceding conversion-even after channel, speed, or reference changes-enabling deterministic scan timing in closed-loop control. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction eliminates long-term drift and supply/temperature dependencies-no user intervention required for 15ppm absolute accuracy. |
| MUXOUT/ADCIN signal path | Enables insertion of external gain/buffer between multiplexer and ADC core while preserving factory calibration-reduces BOM count versus discrete op-amp solutions. |
| Guaranteed modulator stability | Immune to lock-up under any valid input/reference condition-including open-circuit sensors or mismatched reference common-mode voltages-ensures robust field operation. |
| Internal oscillator | Eliminates external crystal or clock source-reduces board area and component count while maintaining timing accuracy across temperature and voltage. |
Applications
| Industrial Weight Scales | Pressure Transducer Systems |
|---|---|
Use Scenario: High-accuracy load cell digitization in platform scales and hopper weighing systems requiring NTEP certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC with ratiometric reference switching across multiple bridge sensors and temperature compensation channels. Use Value: 200nVRMS noise and <5µV offset ensure resolution below 10ppm of full scale-meeting Class III/III L metrology requirements without post-processing. |
Use Scenario: Multi-point pressure monitoring in HVAC chillers and industrial process control panels with redundant sensor inputs. IC Role / Device Role / Timing Role: Centralized analog front-end digitizing four differential pressure bridges and one ambient temperature RTD using independent reference pairs. Use Value: Five selectable differential references eliminate reference crosstalk; 4kHz multiplexing rate enables sub-250µs per-sensor update intervals for fast-response control loops. |
| Direct Temperature Measurement | Gas Chromatography Detectors |
Use Scenario: Precision RTD-based temperature monitoring in semiconductor fabrication tools and medical diagnostic equipment. IC Role / Device Role / Timing Role: Ratiometric ADC interfaced to 4-wire Pt100/1000 sensors with automatic lead resistance cancellation and cold-junction compensation. Use Value: 0.0005% INL and 15ppm absolute accuracy maintain traceable calibration over –40°C to 85°C-supporting ISO 17025-compliant measurement uncertainty budgets. |
Use Scenario: Low-noise signal conditioning for thermal conductivity detectors (TCDs) and flame ionization detectors (FIDs) in portable GC analyzers. IC Role / Device Role / Timing Role: High-dynamic-range digitizer capturing microvolt-level detector outputs with simultaneous 50/60Hz line rejection. Use Value: 200nVRMS noise at 13.8Hz and built-in notch filtering enable detection of ppm-level gas concentrations without external analog filters or DSP overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCR | 24-bit, 16-channel, but only one differential reference input; higher 1.5µVRMS noise at 10kSPS; SPI-only interface. | Lacks independent ratiometric reference sets-requires external mux or reference switching for multi-sensor ratiometric use. | Select when channel count >8 is needed and ratiometric flexibility is secondary to integration density. |
| LTC2449CUHF#PBF | Same architecture and pinout, but commercial-grade (0°C to 70°C); identical noise, INL, and reference structure. | Not rated for extended industrial temperature range; unsuitable for outdoor or high-ambient environments. | Select only for cost-sensitive consumer or lab-bench applications where –40°C to 85°C operation is unnecessary. |
Compared with ADS1258IRTCR and LTC2449CUHF#PBF, the LTC2447IUHF#PBF uniquely combines industrial temperature rating, five independent differential reference inputs, and MUXOUT/ADCIN buffering-making it the only option that preserves ratiometric accuracy across heterogeneous sensor arrays without added components or firmware complexity.
Availability
LTC2447IUHF#PBF is available at Aetrix Electronics and suitable for industrial weight scales, pressure transducer systems, and direct temperature measurement applications requiring stable component supply, long-term calibration integrity, and guaranteed lifecycle support.
Supply support for LTC2447IUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2447IUHF#PBF belongs to the LTC244x family of high-speed delta-sigma ADCs designed specifically for precision ratiometric sensor measurement in harsh industrial environments-emphasizing modulator stability, zero-latency conversion, and seamless reference/input multiplexing.
FAQ
What is the operating temperature range of the LTC2447IUHF#PBF?
The LTC2447IUHF#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 applications. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted.
Does the LTC2447IUHF#PBF require an external crystal or clock source?
No, the LTC2447IUHF#PBF includes an internal oscillator and operates without external timing components. The FO pin can be tied to GND or VCC to select internal clock mode. External oscillators (0.1–12MHz) are optional for applications requiring precise synchronization or higher output rates beyond internal oscillator limits.
How does the MUXOUT/ADCIN feature of the LTC2447IUHF#PBF improve system accuracy?
The MUXOUT/ADCIN pins allow insertion of an external buffer or gain stage between the analog multiplexer and ADC core. Because the LTC2447IUHF#PBF performs per-conversion auto-calibration, it inherently corrects for offset and gain errors introduced by the external circuit-preserving 24-bit linearity and eliminating manual calibration steps in production.
Can the LTC2447IUHF#PBF perform simultaneous conversions on multiple channels?
No, the LTC2447IUHF#PBF is a successive-approximation-multiplexed delta-sigma ADC-it sequentially converts one channel per cycle. However, its no-latency architecture ensures the first result after any channel change is fully accurate, enabling effective 4kHz multiplexing rates with deterministic timing and no settling delay between channels.
What is the significance of the five differential reference inputs on the LTC2447IUHF#PBF?
The five differential reference inputs (four channel-paired + one global) allow independent ratiometric scaling per sensor group-for example, assigning unique references to RTD, thermocouple, bridge, and current-sense channels. This eliminates reference crosstalk and enables true multi-sensor ratiometric measurement without external switches or additional ICs.
LTC2447IUHF#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:
- 4, 8
- 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:
- -
LTC2447IUHF#PBF FAQ
1.How can I place an order for LTC2447IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2447IUHF#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 LTC2447IUHF#PBF reliable?
The price and inventory of LTC2447IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2447IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2447IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2447IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2447IUHF#PBF?
LTC2447IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2447IUHF#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 LTC2447IUHF#PBF?
For technical support, including LTC2447IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2447IUHF#PBF requirements.
6.How does Aetrix verify that LTC2447IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2447IUHF#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 LTC2447IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2447IUHF#PBF?
All LTC2447IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2447IUHF#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 LTC2447IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2447IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2447IUHF#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
