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Analog Devices Inc. LTC2447IUHF#TRPBF
- Part No.:
- LTC2447IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2447IUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
LTC2447IUHF#TRPBF 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, RTD/bridge-based temperature and pressure measurement systems.
For engineers reviewing the LTC2447IUHF#TRPBF datasheet, LTC2447IUHF#TRPBF pinout, LTC2447IUHF#TRPBF application, or LTC2447IUHF#TRPBF equivalent, key selection criteria 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.
Technical Context
The LTC2447IUHF#TRPBF implements a proprietary third-order delta-sigma modulator with decimating FIR filter and on-the-fly auto-calibration of offset and full-scale 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 sequencing.
It features a 19-input/4-output analog multiplexer supporting four differential or eight single-ended inputs, plus five differential reference inputs-including four channel-paired sets (VREF01–VREF67) and one global reference (VREFG±). The MUXOUTP/ADCINP/ADCINN/MUXOUTN pins enable external signal conditioning without degrading calibration integrity.
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 with 50/60Hz rejection-enables high-resolution DC measurements in noisy industrial environments. |
| INL | ±0.0005% (±15ppm of VREF)-ensures accurate end-point linearity critical for calibrated sensor systems. |
| Offset Error | <5µV over –40°C to 85°C-minimizes zero-point drift in long-term embedded instrumentation. |
| Output Rate | Up to 8kHz in 2× mode-supports high-speed scanning of multiple sensors without settling delay. |
| Reference Inputs | Five selectable differential reference pairs-enables true ratiometric digitization of up to four RTDs or bridges simultaneously. |
| Supply Current | 8mA typical in conversion mode; 20µA in autosleep at 6.9Hz-reduces power in battery-operated or thermally constrained designs. |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). Pin pitch: 0.5mm. 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) | Power and signal reference ground | Seven dedicated ground connections minimize ground bounce and improve PSRR in high-resolution ADC operation. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal asserts during conversion; transitions LOW when 32-bit result is ready-enables interrupt-driven host MCU readout. |
| MUXOUTP / MUXOUTN (Pins 24,27) | Positive/negative multiplexer output | Drives external buffer/amplifier for selected IN+/IN– channel-decouples multiplexer switching transients from ADC front-end. |
| ADCINP / ADCINN (Pins 25,26) | Buffered ADC input terminals | Accept conditioned signal from MUXOUT outputs-enables gain/level-shifting while preserving auto-calibration accuracy. |
| VREF01± to VREF67± (Pins 10–11,14–15,18–19,22–23) | Differential reference inputs | Four independent reference pairs tied to specific CHx groups-support simultaneous ratiometric measurement of multiple sensors with distinct excitation sources. |
| VREFG± (Pins 29–30) | Global reference input | Single differential reference usable by any input channel via software control-simplifies configuration for non-ratiometric signals like thermocouples. |
| 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 mixed topology sensor arrays. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Each output corresponds precisely to the most recent conversion-even after channel/reference/speed change-eliminates filter settling delays in multiplexed systems. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes drift due to temperature, supply variation, and aging-no user intervention required. |
| External buffering interface | MUXOUT/ADCIN pins allow insertion of single external op-amp stage for all 8 channels-reduces component count vs per-channel buffering. |
| Guaranteed modulator stability | Immune to lock-up under any valid input/reference condition-ensures robust operation with unregulated or noisy sensor excitation sources. |
| Flexible serial interface | Supports internal SCK (SCK as output) or external SCK (SCK as input) via EXT pin-simplifies integration with diverse host controllers and timing architectures. |
Applications
| Industrial Weighing Systems | RTD-Based Temperature Monitoring |
|---|---|
|
Use Scenario: High-accuracy load cell signal digitization in platform scales and hopper weighers with dual-range capability. IC Role / Device Role: Primary 24-bit sigma-delta ADC performing ratiometric measurement using bridge excitation voltage as reference. Use Value: 200nVRMS noise and <5µV offset enable 1:1,000,000 resolution with minimal calibration overhead across temperature. |
Use Scenario: Simultaneous monitoring of four 4-wire Pt100 RTDs in HVAC chillers or process reactors. IC Role / Device Role: Multiplexed ratiometric ADC using dedicated VREF01–VREF67 reference pairs per RTD group. Use Value: Eliminates need for four separate precision references; 0.0005% INL ensures traceable temperature accuracy per IEC 60751 Class A. |
| Pressure Transmitter Front-End | Gas Chromatography Detector Interface |
|
Use Scenario: Digitizing millivolt-level output from silicon piezoresistive pressure sensors with on-board excitation and cold-junction compensation. IC Role / Device Role: Dual-function ADC acquiring both sensor bridge (ratiometric) and thermistor (absolute) channels using VREFG±. Use Value: Single-chip solution reduces BOM count; 50/60Hz rejection suppresses AC mains interference in factory-floor installations. |
Use Scenario: Low-noise acquisition of FID or TCD detector outputs in portable GC analyzers requiring sub-microvolt sensitivity. IC Role / Device Role: High-resolution, low-drift ADC operating in autosleep mode (20µA @ 6.9Hz) between sample pulses. Use Value: 2.8µVRMS noise at 880Hz enables detection of trace hydrocarbon peaks without external amplification. |
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, 8-channel, but uses internal reference only; no dedicated differential reference inputs; 125SPS max at 24-bit. | Lacks native ratiometric support for multiple bridges/RTDs-requires external reference muxing and increases system complexity. | Select when absolute accuracy suffices and reference flexibility is secondary to ultra-low power (1.2mW). |
| AD7195BRUZ | 24-bit, 8-channel with PGA, but only two differential reference inputs; 4.4kSPS max; higher noise (120nVRMS at 4.7Hz). | Supports fewer independent ratiometric sensor groups; lacks MUXOUT/ADCIN for external buffering. | Choose when programmable gain is needed for wide-dynamic-range sensors and board space permits larger TSSOP-32 package. |
Compared with ADS1258IRTCR and AD7195BRUZ, the LTC2447IUHF#TRPBF uniquely combines five independent differential reference inputs, MUXOUT/ADCIN signal conditioning interface, and guaranteed no-latency operation-making it optimal for multiplexed ratiometric systems where calibration integrity and timing determinism are critical.
Availability
LTC2447IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial weighing systems, RTD-based temperature monitoring, pressure transmitter front-ends, gas chromatography detector interfaces, and high-precision data acquisition requiring stable component supply across extended temperature ranges.
Supply support for LTC2447IUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and communications.
The LTC2447IUHF#TRPBF belongs to the LTC244x family of high-speed, multichannel delta-sigma ADCs designed specifically for demanding ratiometric sensor measurement applications-emphasizing modulator stability, per-conversion calibration, and flexible reference architecture.
FAQ
What is the operating temperature range of the LTC2447IUHF#TRPBF?
The LTC2447IUHF#TRPBF is rated for –40°C to +85°C ambient operation, matching the "I" grade specification. This extended range ensures reliable performance in industrial control cabinets, outdoor instrumentation enclosures, and automotive under-hood environments where thermal cycling is common. All key specifications-including offset error (<5µV), INL (±15ppm), and noise (200nVRMS)-are guaranteed across this full range.
Does the LTC2447IUHF#TRPBF require external components for basic operation?
No, the LTC2447IUHF#TRPBF operates autonomously with only a 10µF tantalum + 0.1µF ceramic bypass capacitor on VCC (Pin 28) and proper grounding of all seven GND pins and the exposed thermal pad (Pin 39). Its internal oscillator eliminates need for external crystal or clock source. Reference and input signals connect directly-no external filters, buffers, or references are mandatory unless system-level requirements demand them.
How does the MUXOUT/ADCIN feature of the LTC2447IUHF#TRPBF differ from the LTC2446?
The LTC2447IUHF#TRPBF includes dedicated MUXOUTP, MUXOUTN, ADCINP, and ADCINN pins-absent in the LTC2446-to route multiplexer outputs to an external op-amp and feed its output back into the ADC. This allows gain, filtering, or level-shifting before digitization while preserving auto-calibration accuracy. The LTC2446 internally connects these nodes, making external buffering impractical without sacrificing performance.
Can the LTC2447IUHF#TRPBF perform simultaneous conversions on multiple channels?
No-the LTC2447IUHF#TRPBF 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 settled and accurate, enabling effective scan rates up to 4kHz (multiplexing rate) and 8kHz (output rate in 2× mode) without traditional settling penalties.
What reference configurations does the LTC2447IUHF#TRPBF support for ratiometric measurements?
The LTC2447IUHF#TRPBF supports five independent differential reference inputs: four paired sets (VREF01±, VREF23±, VREF45±, VREF67±) assigned to specific CHx groups, plus one global pair (VREFG±) usable by any channel. Each reference pair accepts 0.1V to VCC differential voltage with GND-to-VCC common-mode range-enabling true ratiometric digitization of multiple bridges, RTDs, or strain gauges with independent excitation sources.
LTC2447IUHF#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2447IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2447IUHF#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 LTC2447IUHF#TRPBF reliable?
The price and inventory of LTC2447IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2447IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2447IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2447IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2447IUHF#TRPBF?
LTC2447IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2447IUHF#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 LTC2447IUHF#TRPBF?
For technical support, including LTC2447IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2447IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2447IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2447IUHF#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 LTC2447IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2447IUHF#TRPBF?
All LTC2447IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2447IUHF#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 LTC2447IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2447IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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