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Analog Devices Inc. LTC2447CUHF#TRPBF
- Part No.:
- LTC2447CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2447CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
LTC2447CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel delta-sigma ADC with integrated multiplexer, selectable differential reference inputs, and MUXOUT/ADCIN pins for external buffering. It delivers 200nVRMS noise at 13.8Hz with simultaneous 50/60Hz rejection, 0.0005% INL, and no missing codes-designed for high-precision ratiometric sensor digitization in industrial weighing and pressure transducer systems.
For engineers reviewing the LTC2447CUHF#TRPBF datasheet, LTC2447CUHF#TRPBF pinout, LTC2447CUHF#TRPBF application, or LTC2447CUHF#TRPBF equivalent, key selection criteria include its 38-lead QFN package, five independent differential reference input sets, no-latency conversion architecture, 2× speed mode enabling up to 8kHz output rate, and guaranteed modulator stability across all input/reference conditions.
Technical Context
The LTC2447CUHF#TRPBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration-performing offset and full-scale correction every conversion cycle without interrupting operation. Its 4-wire serial interface supports both internal and external SCK modes via the EXT pin, and features real-time BUSY status signaling and EOC bit output on SDO during CS low.
It integrates an 19-input/4-output analog multiplexer supporting four differential or eight single-ended input configurations, plus five selectable differential reference inputs (four channel-paired + one global). The MUXOUTP/ADCINP/ADCINN/MUXOUTN pins enable external gain/buffering while preserving calibration integrity-distinct from the LTC2446 which lacks these terminals.
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 with simultaneous 50/60Hz rejection-enables direct thermocouple or low-level bridge measurements without external filtering. |
| Integral Nonlinearity | ±15ppm of VREF-translates to <0.0005% error over full scale, critical for metrology-grade weight scales and calibration equipment. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C)-eliminates need for system-level offset trimming in precision sensor front-ends. |
| Output Rate | Up to 8kHz in 2× mode with one-cycle latency-supports high-speed multiplexed scanning of multiple RTDs or strain gauges. |
| Reference Inputs | Five differential sets (VREF01±, VREF23±, VREF45±, VREF67±, VREFG±)-enables true ratiometric digitization of up to four independent bridges or RTDs with dedicated references. |
| Supply Current | 8mA typical in conversion mode; 20µA in autosleep at 6.9Hz-reduces thermal drift and enables battery-powered portable instrumentation. |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package with exposed pad (Pin 39 = GND), requiring soldering to PCB ground plane for thermal and electrical performance. Pin count and layout match LTC2446/LTC2447 family; temperature grade is commercial (0°C to 70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Power and signal ground | Seven dedicated ground connections minimize ground bounce and improve PSRR in high-resolution measurement paths. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal indicates ongoing conversion; transitions LOW when result is valid and ready for readout-usable as hardware interrupt. |
| EXT (Pin 3) | SCK mode select | Logic HIGH enables internal SCK generation on Pin 38; LOW configures SCK as external clock input-no register programming required. |
| COM (Pin 7) | Common negative input | Shared IN– node for all single-ended configurations; supports rail-to-rail common-mode voltage (GND–0.3V to VCC+0.3V). |
| CH0–CH7 (Pins 8,9,12,13,16,17,20,21) | Analog input channels | Configurable as differential pairs or single-ended inputs; each pair referenced to COM or selected differential reference set. |
| VREF01± to VREF67± (Pins 10–11,14–15,18–19,22–23) | Differential reference inputs | Four independent reference pairs tied to specific CHx groups; allow isolated ratiometric scaling per sensor channel. |
| VREFG± (Pins 29–30) | Global reference input | Single differential reference selectable for any input channel via control word-simplifies non-ratiometric measurements (e.g., thermocouples). |
| MUXOUTP/N (Pins 24,27) | Multiplexer output (pos/neg) | Drives external buffer/amplifier before ADC input-enables gain, isolation, or drive capability without degrading calibration accuracy. |
| ADCINP/N (Pins 25,26) | ADC input (pos/neg) | Accepts buffered signal from MUXOUTP/N; internal calibration automatically compensates for external amplifier offset and gain errors. |
| CS (Pin 36) | Chip select | Active-low enable: wakes device from sleep, activates SDO, and initiates data transfer-controls power state and interface timing. |
| SDO (Pin 37) | Serial data output | 3-state output delivering 32-bit frame: Bits 31–28 = status (EOC, DMY, SIG, MSB); Bits 27–4 = 24-bit result; Bits 4–0 = sub-LSBs. |
| SCK (Pin 38) | Serial clock | Bidirectional: output in internal mode (driven by device), input in external mode-data latched on rising edge, shifted on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Each conversion result corresponds precisely to the selected channel and reference-no settling delay after channel/speed/resolution change. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction eliminates drift due to temperature, supply variation, or time-no user intervention needed. |
| Flexible reference architecture | Five independent differential reference inputs support mixed ratiometric (RTD, bridge) and non-ratiometric (thermocouple, voltage) sensors on same device. |
| MUXOUT/ADCIN interface | Enables single external op-amp to condition all 8 channels while maintaining calibrated accuracy-reduces BOM cost and board area vs discrete solutions. |
| Internal oscillator | Eliminates external crystal or clock source; supports external fO (0.1–12MHz) for precise timing control in synchronized multi-device systems. |
Applications
| Industrial Weighing Systems | Pressure Transducer Interfaces |
|---|---|
|
Use Scenario: High-accuracy load cell digitization in platform scales and hopper weighers with automatic tare and span calibration. IC Role / Device Role / Timing Role: Primary ADC capturing mV-level bridge outputs; performs ratiometric conversion using dedicated VREF01± for each load cell group. Use Value: 200nVRMS noise and <5µV offset enable 1:1,000,000 resolution without external amplification or trimming-meeting OIML R76 Class III requirements. |
Use Scenario: Multi-point pressure monitoring in HVAC chillers with redundant sensor inputs and fault detection. IC Role / Device Role / Timing Role: Simultaneous digitization of four differential pressure sensors using VREF23±, VREF45±, VREF67±, and VREFG± for reference flexibility. Use Value: Five independent reference inputs allow individual scaling per sensor, while 0.0005% INL ensures consistent accuracy across 0–100% pressure range. |
| Direct Temperature Measurement | Gas Chromatography Detectors |
|
Use Scenario: Cold-junction compensation and thermocouple linearization in industrial process controllers. IC Role / Device Role / Timing Role: Digitizes Type K/J thermocouples using VREFG± as universal reference; leverages 50/60Hz rejection for noisy plant-floor environments. Use Value: Simultaneous 50/60Hz rejection at 13.8Hz output rate eliminates need for external notch filters-reducing component count and board space. |
Use Scenario: Low-noise signal acquisition from FID or TCD detectors in portable GC analyzers requiring battery operation. IC Role / Device Role / Timing Role: ADC front-end with autosleep mode (20µA at 6.9Hz) and internal oscillator-enables long runtime without external timing components. Use Value: 20µA sleep current extends battery life; 24-bit resolution captures trace-level compound peaks without signal averaging or oversampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCR | 24-bit, 8-channel, but uses internal PGA and fixed reference architecture-no independent differential reference inputs. | Lacks per-channel ratiometric capability; requires external reference switching for multi-sensor systems. | Select when PGA gain control is prioritized over reference flexibility and MUXOUT buffering. |
| LTC2446CUHF#TRPBF | Same pinout and core architecture, but omits MUXOUT/ADCIN pins and has higher RMS noise (280nV vs 200nV at 6.9Hz). | Not suitable for applications requiring external buffering of all 8 channels with calibrated gain. | Choose for cost-sensitive designs where external buffering is unnecessary and lower noise is not required. |
Compared with ADS1258IRTCR and LTC2446CUHF#TRPBF, the LTC2447CUHF#TRPBF uniquely combines five independent differential reference inputs, MUXOUT/ADCIN for calibrated external gain, and lowest noise in its class-making it optimal for metrology-grade multiplexed sensor systems demanding both flexibility and precision.
Availability
LTC2447CUHF#TRPBF is available at Aetrix Electronics and suitable for industrial weighing systems, pressure transducer interfaces, direct temperature measurement, gas chromatography detectors, and high-precision sensor data acquisition requiring stable component supply and long-term manufacturability.
Supply support for LTC2447CUHF#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.
The LTC2447CUHF#TRPBF belongs to the LTC244x family of high-speed delta-sigma ADCs designed specifically for precision industrial sensor interfacing-emphasizing ratiometric accuracy, multiplexer flexibility, and seamless integration into automated test and measurement equipment.
FAQ
What is the maximum output data rate of the LTC2447CUHF#TRPBF?
The LTC2447CUHF#TRPBF achieves up to 8kHz output rate in 2× speed mode with external oscillator (fO), and up to 4kHz multiplexing rate across all eight channels. In standard 1× mode, maximum rate is 4kHz with no latency-ensuring each conversion result corresponds exactly to the selected input and reference configuration without settling delay.
How does the LTC2447CUHF#TRPBF handle reference input flexibility for different sensor types?
The LTC2447CUHF#TRPBF provides five independent differential reference inputs: four paired sets (VREF01±, VREF23±, VREF45±, VREF67±) for ratiometric sensors like RTDs and bridges, plus one global reference (VREFG±) for non-ratiometric sources such as thermocouples or voltage signals. This allows simultaneous digitization of mixed sensor types without external switching or calibration overhead.
What is the function of the MUXOUT and ADCIN pins on the LTC2447CUHF#TRPBF?
The LTC2447CUHF#TRPBF includes MUXOUTP/N and ADCINP/N pins to insert an external op-amp between the multiplexer output and ADC input. This enables gain, isolation, or drive capability for all eight channels using a single amplifier-while the device's continuous auto-calibration removes the amplifier's offset and gain errors, preserving system accuracy without manual trimming.
Does the LTC2447CUHF#TRPBF require external components for basic operation?
No. The LTC2447CUHF#TRPBF includes an internal oscillator and requires only decoupling capacitors (10µF tantalum + 0.1µF ceramic on VCC) for stable operation. External components are optional: an external oscillator (0.1–12MHz) on FO pin for precise timing, or external buffers on MUXOUT/ADCIN for signal conditioning-neither is mandatory for functional operation.
What is the operating temperature range of the LTC2447CUHF#TRPBF?
The LTC2447CUHF#TRPBF is specified for the commercial temperature range of 0°C to 70°C, as indicated by the "C" grade in the part number. It is packaged in a 38-lead 5mm × 7mm plastic QFN with exposed pad (Pin 39 = GND), and features guaranteed performance-including <5µV offset and ±15ppm INL-across this full range.
LTC2447CUHF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2447CUHF#TRPBF FAQ
1.How can I place an order for LTC2447CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2447CUHF#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 LTC2447CUHF#TRPBF reliable?
The price and inventory of LTC2447CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2447CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2447CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2447CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2447CUHF#TRPBF?
LTC2447CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2447CUHF#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 LTC2447CUHF#TRPBF?
For technical support, including LTC2447CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2447CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2447CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2447CUHF#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 LTC2447CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2447CUHF#TRPBF?
All LTC2447CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2447CUHF#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 LTC2447CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2447CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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