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Analog Devices Inc. LTC2444IUHF#TRPBF
- Part No.:
- LTC2444IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2444IUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,388
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Product details
Overview
LTC2444IUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel (4-differential) no-latency delta-sigma ADC with selectable speed/resolution, 2 µVRMS noise at 1.76 kHz output rate, 0.0005% INL, and differential input/reference support from GND to VCC. It enables high-precision, high-speed data acquisition in weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2444IUHF#TRPBF datasheet, LTC2444IUHF#TRPBF pinout, LTC2444IUHF#TRPBF application, or LTC2444IUHF#TRPBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, autosleep mode for 20 µA operation at 6.9 Hz, simultaneous 50/60 Hz rejection, and internal oscillator eliminating external timing components.
Technical Context
The LTC2444IUHF#TRPBF employs a proprietary third-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration-performing offset and full-scale correction every conversion cycle. Its no-latency architecture ensures the first result after channel/speed change is valid, with no settling delay or DC accuracy shift.
It supports both internal and external SCK modes via the EXT pin, and uses a 4-wire SPI-compatible interface (CS, SDI, SDO, SCK) with 32-bit output format including sign, EOC, and 24-bit result + 5 sub-LSBs. Conversion timing is governed by OSR (256–32768) and 1X/2X speed mode, enabling output rates from 6.9 Hz to 7 kHz.
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. |
| INL | ±0.0005% of VREF (±12 ppm)-ensures high linearity for precision measurement without calibration lookup tables. |
| RMS Noise | 2 µV at 1.76 kHz output rate; 200 nV at 13.8 Hz with simultaneous 50/60 Hz rejection-enables direct thermocouple or low-level sensor digitization. |
| Offset Error | <5 µV (4.5 V ≤ VCC ≤ 5.5 V, –40°C to 85°C)-minimizes zero-point drift in weigh scale or strain gauge front ends. |
| Input Range | Differential ±0.5 × VREF; common-mode from GND to VCC-supports single-ended, pseudo-differential, and fully differential configurations without level-shifting. |
| Supply Current | 8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz-enables battery-powered portable DVMs and IoT sensing nodes. |
| Reference Range | 0.1 V to VCC differential; REF+ and REF– each tolerate GND to VCC-allows flexible reference sourcing (e.g., bandgap, resistor divider, or external precision ref). |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN (UHF), exposed pad (Pin 39) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 5, 6, 31, 32, 33) | Power and signal ground reference | Seven dedicated ground pins minimize ground bounce and improve PSRR in multi-channel scanning. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready-enables interrupt-driven host firmware without polling. |
| EXT (Pin 3) | SCK direction control | LOW = external clock input on SCK; HIGH = internal SCK generation-eliminates need for external clock source or master controller timing coordination. |
| COM (Pin 7) | Common negative input for single-ended channels | Accepts voltage from GND – 0.3 V to VCC + 0.3 V-enables ratiometric measurements with grounded or biased references. |
| CH0–CH7 (Pins 9, 10, 13, 14, 17, 18, 21, 22) | Analog input channels | Configurable as single-ended or differential pairs (e.g., CH0+/CH1–); support up to 500 Hz full 8-channel scan rate in 1X mode. |
| REF+, REF– (Pins 29, 30) | Differential reference inputs | Enable true ratiometric operation; REF+ must exceed REF– by ≥0.1 V-rejects common-mode noise and supply ripple in bridge sensor interfaces. |
| SDI, SDO, SCK, CS (Pins 34, 37, 38, 36) | 4-wire serial interface | Compatible with standard SPI timing; CS-controlled sleep/wake allows deterministic power management per conversion cycle. |
Key Features
| Feature | Design Value |
|---|---|
| No latency delta-sigma architecture | First conversion after channel/speed change is accurate-enables real-time multiplexed monitoring without dead time or settling artifacts. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction-maintains ±5 µV offset and <0.0005% INL over temperature and supply variation without user intervention. |
| Selectable speed/resolution (10 combinations) | Output rates from 6.9 Hz (280 nV RMS noise) to 3.5 kHz (25 µV RMS noise)-matches resolution/noise trade-off to sensor bandwidth and system requirements. |
| Simultaneous 50/60 Hz rejection at 6.9 Hz | Integrated notch filtering eliminates mains interference in industrial environments-no external digital filtering or firmware compensation needed. |
| Internal oscillator | No external crystal or clock required-reduces BOM count, PCB area, and startup timing complexity in cost-sensitive instrumentation. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-precision load cell readout in commercial bench scales with 100,000-count resolution and <1 µV sensitivity. IC Role / Device Role / Timing Role: 24-bit delta-sigma ADC performing ratiometric conversion of mV-level bridge outputs with integrated 50/60 Hz rejection. Use Value: Eliminates external anti-aliasing filters and digital post-processing, achieving NIST-traceable accuracy with single-chip solution. | Use Scenario: Portable handheld multimeter supporting auto-ranging across 100 mV to 1000 V ranges with 6½-digit display resolution. IC Role / Device Role / Timing Role: Primary ADC with programmable OSR and 2X speed mode enabling fast range switching and stable readings within 100 ms. Use Value: Delivers 200 nV RMS noise at 13.8 Hz and <5 µV offset-enables sub-µV resolution on low ranges without chopper-stabilized op-amps. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction-compensated thermocouple interface in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Simultaneous digitization of thermocouple voltage and RTD reference using CH0/CH1 differential pair and COM-referenced RTD bias. Use Value: 2 µV RMS noise at 1.76 kHz and guaranteed modulator stability ensure reliable µV-level thermocouple signals are captured without lock-up or missing codes. | Use Scenario: Multi-sensor condition monitoring in predictive maintenance edge node (vibration, current, temperature). IC Role / Device Role / Timing Role: 8-channel scan ADC operating at 500 Hz per channel in 1X mode, delivering synchronized samples to MCU DMA engine. Use Value: No-latency conversion and autosleep reduce average current to <100 µA/channel-extending battery life in wireless sensor nodes. |
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 |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 8-channel, but requires external crystal; no simultaneous 50/60 Hz rejection; higher typical offset (±10 µV). | Best suited for DC-coupled, low-noise lab equipment where external timing is acceptable. | Choose ADS1256IDBT if external clock synchronization is required or if lower-cost QFN-28 package is preferred. |
| MAX11206ETN+ | 24-bit, 4-channel, integrated PGA; lower max output rate (2 kSPS); no internal oscillator-requires external clock. | Ideal for low-channel-count sensor nodes needing programmable gain before digitization. | Choose MAX11206ETN+ when front-end amplification is needed and 4-channel count suffices. |
Compared with ADS1256IDBT and MAX11206ETN+, the LTC2444IUHF#TRPBF uniquely combines internal oscillator, simultaneous 50/60 Hz rejection, and guaranteed modulator lock-up immunity-making it optimal for robust, self-contained industrial measurement systems where reliability and minimal external components are critical.
Availability
LTC2444IUHF#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, and direct temperature measurement systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 85°C.
Supply support for LTC2444IUHF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2444IUHF#TRPBF belongs to ADI's legacy Linear Technology high-precision delta-sigma ADC product line, designed specifically for demanding instrumentation applications requiring no-latency, high linearity, and inherent noise rejection without firmware overhead.
FAQ
What is the maximum output data rate of the LTC2444IUHF#TRPBF?
The LTC2444IUHF#TRPBF achieves up to 7 kHz output rate in 2X speed mode with internal oscillator, or up to 8 kHz when driven by an external oscillator (fEOSC ≤ 12 MHz). At 1X mode, the maximum is 3.5 kHz with internal clock or 4 kHz with external clock-enabling high-throughput scanning of all 8 channels at 500 Hz per channel.
Does the LTC2444IUHF#TRPBF require an external crystal or clock source?
No, the LTC2444IUHF#TRPBF includes a fully integrated internal oscillator and operates without any external timing components. The FO pin can be tied to GND or VCC to enable internal clocking; an external oscillator is optional and only used when higher output rates (up to 8 kHz) or precise synchronization is required.
How does the LTC2444IUHF#TRPBF handle input overrange and underrange conditions?
The LTC2444IUHF#TRPBF generates unique 32-bit output codes for overrange (+FS) and underrange (–FS) conditions. Bits 29 and 28 together indicate status: both HIGH = overrange; both LOW = underrange. This allows firmware to detect saturation without additional analog comparators or threshold monitoring circuits.
What is the purpose of the COM pin on the LTC2444IUHF#TRPBF?
The COM pin serves as the common negative input for all single-ended channel configurations on the LTC2444IUHF#TRPBF. It accepts voltages from GND – 0.3 V to VCC + 0.3 V and enables ratiometric measurements-for example, connecting a strain gauge bridge's low-side to COM while referencing the ADC's REF– to the same point.
Can the LTC2444IUHF#TRPBF operate with a 3.3 V supply?
No, the LTC2444IUHF#TRPBF specifies a minimum VCC of 4.5 V and maximum of 5.5 V. Operation below 4.5 V violates absolute maximum ratings and may cause modulator instability or invalid conversions. For 3.3 V systems, a regulated 5 V supply rail or alternative ADC (e.g., LTC2440) must be used.
LTC2444IUHF#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:
- -
LTC2444IUHF#TRPBF FAQ
1.How can I place an order for LTC2444IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2444IUHF#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 LTC2444IUHF#TRPBF reliable?
The price and inventory of LTC2444IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2444IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2444IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2444IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2444IUHF#TRPBF?
LTC2444IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2444IUHF#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 LTC2444IUHF#TRPBF?
For technical support, including LTC2444IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2444IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2444IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2444IUHF#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 LTC2444IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2444IUHF#TRPBF?
All LTC2444IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2444IUHF#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 LTC2444IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2444IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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