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Analog Devices Inc. LTC2446CUHF#TRPBF
- Part No.:
- LTC2446CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2446CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,410
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Product details
Overview
LTC2446CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel delta-sigma ADC with integrated 4-terminal multiplexer for ratiometric sensor digitization. It delivers 15ppm absolute accuracy, 200nVRMS noise at 13.8Hz, and supports up to 8kHz output rate in 2× mode. It is used in high-precision industrial weighing systems requiring simultaneous RTD and bridge measurements with no latency between channel changes.
For engineers reviewing the LTC2446CUHF#TRPBF datasheet, LTC2446CUHF#TRPBF pinout, LTC2446CUHF#TRPBF application, or LTC2446CUHF#TRPBF equivalent, key selection criteria include guaranteed no-latency multiplexing, five selectable differential reference inputs, internal oscillator operation, 38-lead QFN package compatibility, and ratiometric measurement stability across temperature and supply variation.
Technical Context
The LTC2446CUHF#TRPBF implements a proprietary third-order delta-sigma modulator with decimating FIR filter and per-conversion auto-calibration for offset and full-scale. Its 4-way analog input MUX supports both differential and single-ended configurations, while four dedicated differential reference pairs (VREF01–VREF67) plus one global reference (VREFG) enable true ratiometric digitization of multiple sensors without external switching.
It operates via a 4-wire serial interface (CS/SDI/SDO/SCK) with dual clock modes: internal oscillator (no external components) or external fO up to 12MHz. All ten speed/resolution combinations-including 2µVRMS noise at 1.76kHz and 50/60Hz rejection at 13.8Hz-are selected dynamically via SDI without settling delay, enabling deterministic scan rates up to 4kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and full dynamic range utilization in precision metrology. |
| INL | ±0.0005% (±15ppm of VREF)-enables direct replacement of 16-bit ADCs with calibration overhead in high-end instrumentation. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C)-eliminates need for system-level offset trimming in load cell interfaces. |
| RMS Noise | 200nV at 13.8Hz with simultaneous 50/60Hz rejection-supports high-resolution thermocouple and strain gauge readings in noisy AC environments. |
| Conversion Rate | Up to 8kHz in 2× mode (external fO)-allows real-time closed-loop control in fast-response pressure or flow sensing. |
| Reference Inputs | Five differential reference inputs (four channel-paired + one global)-enables independent ratiometric scaling per sensor group without external mux ICs. |
| Supply Current | 8mA typical in conversion mode; 20µA in autosleep at 6.9Hz-reduces thermal drift and power supply noise in battery-backed data loggers. |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity. Pin count and layout match LTC2446IUHF#TRPBF and LTC2447 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Power and signal reference ground | Seven dedicated ground pins minimize ground bounce and improve PSRR in multi-channel acquisition. |
| CH0–CH7 (Pins 8,9,12,13,16,17,20,21) | Analog input channels | Configurable as differential pairs or single-ended inputs referenced to COM (Pin 7); support ±0.5·VREF bipolar range. |
| VREF01+ / VREF01– (Pins 11/10), VREF23+/– (15/14), VREF45+/– (19/18), VREF67+/– (23/22) | Differential reference inputs | Four independent reference pairs allow simultaneous ratiometric digitization of four sensor groups (e.g., four RTDs). |
| VREFG+ / VREFG– (Pins 29/30) | Global reference input | Single reference pair usable with any channel via software bit-simplifies non-ratiometric measurements (e.g., thermocouples). |
| CS (Pin 36) | Active-low chip select | Wakes device from sleep, enables SDO output, and triggers new conversion on rising edge-enables precise timing control in synchronous systems. |
| SDI / SDO / SCK / BUSY (Pins 34,37,38,2) | Serial interface and status | 4-wire SPI-compatible interface with BUSY flag for interrupt-driven host polling; no configuration registers required. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency multiplexing | First conversion after channel/reference/speed change is valid-enables deterministic 4kHz scan rates without guard-band delays. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction eliminates drift-induced errors over time, temperature, and supply voltage variation. |
| True differential reference support | Each reference pair accepts common-mode voltages from GND to VCC, enabling direct connection to unbuffered bridge outputs. |
| Internal oscillator | No external crystal or RC network required-reduces BOM count and layout sensitivity in space-constrained industrial modules. |
| 50/60Hz simultaneous rejection | Guaranteed at 13.8Hz output rate without notch filters-preserves signal integrity in mains-powered factory equipment. |
Applications
| Industrial Weighing Systems | Multi-Sensor Process Monitoring |
|---|---|
Use Scenario: High-accuracy weight measurement in platform scales using four 350Ω strain gauge bridges. IC Role / Device Role / Timing Role: Simultaneous ratiometric digitization of all four bridges using VREF01–VREF67 reference pairs and CH0–CH7 inputs. Use Value: Eliminates need for external analog switches and reference buffers, reducing component count and thermal EMF errors. |
Use Scenario: Real-time monitoring of temperature, pressure, and flow in HVAC control panels. IC Role / Device Role / Timing Role: Cyclic acquisition of PT100 RTDs (ratiometric), thermocouples (global reference), and 4–20mA loop sensors (single-ended). Use Value: Single-chip solution replaces three discrete ADCs, ensuring synchronized sampling and consistent calibration across sensor types. |
| Gas Chromatography Detectors | High-Precision Weight Scales |
Use Scenario: Digitizing low-level current outputs from flame ionization detectors (FID) with sub-nanoamp resolution. IC Role / Device Role / Timing Role: Low-noise, high-resolution ADC operating at 13.8Hz with 50/60Hz rejection in lab-grade analyzers. Use Value: 200nVRMS noise floor enables detection of trace hydrocarbon peaks without post-acquisition averaging. |
Use Scenario: Legal-for-trade counting scales requiring NTEP certification and <±2ppm linearity. IC Role / Device Role / Timing Role: Primary ADC in Class III/IIII scale electronics, performing auto-zero and span calibration during idle cycles. Use Value: 15ppm INL and guaranteed no-missing-codes meet OIML R76 requirements without firmware linearization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7177-2BRUZ | 32-bit, 10-channel, 10kSPS max, integrated PGA and reference; no built-in ratiometric MUX architecture. | Requires external analog switches for multi-reference ratiometric measurements; better suited for single-reference high-channel-count systems. | Select when higher resolution (32-bit) and integrated PGA outweigh need for native ratiometric MUX flexibility. |
| LTC2449CUHF#TRPBF | Pin-compatible upgrade with √2 lower RMS noise (140nV vs 200nV at 13.8Hz) and enhanced 50/60Hz rejection; identical pinout and register map. | Drop-in replacement where improved noise floor and stronger AC line rejection are critical-e.g., portable gas analyzers. | Choose for performance-critical upgrades where board rework is prohibited and same-footprint improvement is needed. |
Compared with AD7177-2BRUZ, LTC2446CUHF#TRPBF provides native hardware support for ratiometric multiplexing without external components, while LTC2449CUHF#TRPBF offers measurable noise reduction in the same footprint-making LTC2446CUHF#TRPBF optimal for cost-sensitive, ratiometric-dominant designs where 200nVRMS noise is sufficient.
Availability
LTC2446CUHF#TRPBF is available at Aetrix Electronics and suitable for industrial weighing systems, process instrumentation, gas chromatography analyzers, and high-precision weight scales requiring stable component supply across extended production lifecycles.
Supply support for LTC2446CUHF#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 LTC2446CUHF#TRPBF belongs to the LTC244x family of high-speed delta-sigma ADCs designed specifically for precision ratiometric sensor interfacing in industrial and test equipment-emphasizing zero-latency multiplexing, per-cycle calibration, and robust noise immunity.
FAQ
What is the maximum sample rate of the LTC2446CUHF#TRPBF?
The LTC2446CUHF#TRPBF achieves up to 8kHz output rate in 2× mode when driven by an external oscillator (fO up to 12MHz). In standard 1× mode with internal oscillator, the maximum rate is 4kHz. The first conversion after any speed or channel change is valid-no settling delay is required, enabling deterministic high-speed scanning across all eight channels.
Does the LTC2446CUHF#TRPBF require external components for basic operation?
No, the LTC2446CUHF#TRPBF operates fully functional with only bypass capacitors: a 10µF tantalum and 0.1µF ceramic capacitor on VCC to GND. Its internal oscillator eliminates need for crystals or RC networks, and its integrated 4-way MUX removes requirement for external analog switches-making it a true single-chip ratiometric ADC solution.
How does the LTC2446CUHF#TRPBF handle ratiometric measurements across multiple sensors?
The LTC2446CUHF#TRPBF supports ratiometric measurements via four dedicated differential reference input pairs (VREF01–VREF67) and one global reference (VREFG). Each sensor group (e.g., RTD, bridge) connects to its own reference pair, allowing independent scaling and eliminating ratio errors from shared reference drift-critical for multi-sensor industrial transmitters.
What is the operating temperature range of the LTC2446CUHF#TRPBF?
The LTC2446CUHF#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is indicated by the "C" suffix in the part number and confirmed in the ordering information table. For extended industrial use (–40°C to 85°C), the LTC2446IUHF#TRPBF variant is specified and pin-compatible.
Can the LTC2446CUHF#TRPBF perform simultaneous 50Hz and 60Hz line frequency rejection?
Yes-the LTC2446CUHF#TRPBF guarantees simultaneous 50Hz and 60Hz rejection at its 13.8Hz output rate. This is achieved through inherent delta-sigma filter architecture and does not require external notch filters or firmware-based digital cancellation, preserving signal integrity in globally deployed industrial equipment.
LTC2446CUHF#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:
- -
LTC2446CUHF#TRPBF FAQ
1.How can I place an order for LTC2446CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2446CUHF#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 LTC2446CUHF#TRPBF reliable?
The price and inventory of LTC2446CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2446CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2446CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2446CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2446CUHF#TRPBF?
LTC2446CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2446CUHF#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 LTC2446CUHF#TRPBF?
For technical support, including LTC2446CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2446CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2446CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2446CUHF#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 LTC2446CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2446CUHF#TRPBF?
All LTC2446CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2446CUHF#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 LTC2446CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2446CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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