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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. LTC2444CUHF#PBF

Name: LTC2444CUHF#PBF
Brand: Analog Devices Inc.
SKU: LTC2444CUHF#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2444CUHF#PBF

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 38-WFQFN Exposed Pad

Datasheet:: LTC2444CUHF#PBF.pdf

Description:: IC ADC 24BIT SIGMA-DELTA 38QFN

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Product details

Overview

LTC2444CUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel (4-differential) no-latency delta-sigma ADC with selectable speed/resolution, 2 µV_RMS noise at 1.76 kHz output rate, 0.0005% INL, and internal oscillator - used in high-precision industrial data acquisition systems requiring simultaneous 50/60 Hz rejection and channel-scanning without settling delay.

For engineers reviewing the LTC2444CUHF#PBF datasheet, LTC2444CUHF#PBF pinout, LTC2444CUHF#PBF application, or LTC2444CUHF#PBF equivalent, key selection criteria include guaranteed modulator lock-up immunity across all input/reference conditions, autosleep mode enabling 20 µA operation at 6.9 Hz, differential input/reference with GND-to-V_CC common-mode range, and true no-latency mode ensuring first-conversion accuracy after channel/speed change.

Technical Context

The LTC2444CUHF#PBF implements a proprietary third-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration of offset and full-scale every conversion cycle. It supports 10 discrete speed/resolution combinations (6.9 Hz to 3.5 kHz output rate, extendable to 8 kHz with external oscillator), all with zero latency between conversions and no DC accuracy shift.

Its 4-wire SPI-compatible interface operates in either internal SCK (SCK pin outputs clock) or external SCK (SCK pin accepts clock) mode, selected via the EXT pin. The device uses a 32-bit serial output format including sign, end-of-conversion, over/underrange flags, and 24-bit result plus 5 sub-LSBs - all valid immediately post-conversion in 1X mode.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	24-bit with no missing codes - guarantees monotonicity and unambiguous digital representation of analog input across full scale.
INL	±0.0005% of full scale - ensures linearity error ≤ ±3 ppm of V_REF, critical for metrology-grade measurements.
RMS Noise	2 µV at 1.76 kHz output rate - enables high-speed precision measurement without oversampling penalty.
Offset Error	<5 µV (4.5V ≤ V_CC ≤ 5.5V, –40°C to 85°C) - eliminates need for system-level offset trimming in stable supply environments.
Input Range	Differential ±0.5 × V_REF with GND-to-V_CC common-mode on inputs and reference - supports direct connection to sensors without level-shifting circuitry.
Supply Current	8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz - enables battery-powered or low-power industrial monitoring.
Reference Range	0.1 V to V_CC differential - allows flexible scaling from low-voltage sensor outputs up to full rail.

Pinout & Package

Package: 38-lead (5 mm × 7 mm) plastic QFN with exposed pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1,4,5,6,31,32,33)	Ground reference	Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane.
BUSY (Pin 2)	Conversion status indicator	Active-HIGH during conversion; transitions LOW when 32-bit result is ready for readout - enables precise timing of data capture.
EXT (Pin 3)	SCK mode select	Logic HIGH selects internal SCK generation (SCK pin outputs clock); LOW selects external SCK (SCK pin accepts clock).
COM (Pin 7)	Common negative input	Shared IN– for all single-ended configurations; supports bipolar input range when paired with CH0–CH7.
CH0–CH7 (Pins 9,10,13,14,17,18,21,22)	Analog input channels	Configurable as 8 single-ended or 4 differential inputs; support mixed configuration per scan sequence.
VCC (Pin 28)	Positive supply	4.5 V to 5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass to GND.
REF+, REF– (Pins 29,30)	Differential reference inputs	Accept 0.1 V to V_CC differential voltage; common-mode range spans GND to V_CC - enables ratiometric or floating reference designs.
SDI (Pin 34)	Serial data input	Configures next conversion's channel, OSR, and 1X/2X mode; applied during prior data output cycle - enables seamless real-time reconfiguration.
FO (Pin 35)	Frequency control	Tie to GND or V_CC to enable internal oscillator; connect to external 0.1–12 MHz clock for higher output rates.
CS (Pin 36)	Chip select	Active-LOW enables SDO and wakes ADC from sleep; HIGH forces autosleep - primary power management control.
SDO (Pin 37)	Serial data output	3-state output; presents 32-bit result (sign, EOC, 24-bit data, sub-LSBs) on falling edge of SCK - compatible with standard SPI masters.
SCK (Pin 38)	Serial clock	Bidirectional: outputs internal clock (EXT = HIGH) or accepts external clock (EXT = LOW) - eliminates need for external clock generator.

Key Features

Feature	Design Value
No-latency delta-sigma architecture	First conversion after channel/speed change is fully accurate - eliminates multiplexing dead time and enables 500 Hz full 8-channel scan rate.
Continuous auto-calibration	Offset and full-scale corrected every conversion cycle - ensures stability over temperature, supply variation, and time without user intervention.
Simultaneous 50 Hz/60 Hz rejection	Guaranteed at 6.9 Hz output rate - removes mains interference without notch filters or software post-processing.
Autosleep mode	Reduces current to 20 µA at 6.9 Hz output rate - extends battery life in portable instrumentation and remote sensors.
True differential input and reference	GND-to-V_CC common-mode range on both inputs and reference - simplifies front-end design for thermocouples, strain gauges, and bridge sensors.

Applications

Weight Scales	Auto-Ranging 6-Digit DVMs
Use Scenario: High-resolution load cell measurement in commercial and industrial weighing systems requiring NTEP/EC type approval. IC Role / Device Role / Timing Role: Primary ADC capturing differential bridge output with 24-bit resolution, simultaneous 50/60 Hz rejection, and no-latency channel switching for multi-sensor calibration. Use Value: Eliminates external anti-aliasing filters and digital post-processing, achieving <0.001% linearity and <1 µV offset drift over temperature - directly meeting OIML R76 Class III requirements.	Use Scenario: Benchtop and handheld digital multimeters performing auto-ranging AC/DC voltage, current, and resistance measurements. IC Role / Device Role / Timing Role: Core 24-bit ADC providing programmable speed/resolution (6.9 Hz to 3.5 kHz) to match range changes while maintaining 0.0005% INL and 2 µV RMS noise. Use Value: Enables true 6½-digit resolution at low speeds and fast 1000 readings/sec at reduced resolution - all with same hardware and no firmware recalibration.
Direct Temperature Measurement	High-Speed Data Acquisition
Use Scenario: Thermocouple-based temperature monitoring in HVAC, industrial ovens, and process control with cold-junction compensation. IC Role / Device Role / Timing Role: Direct thermocouple digitization using differential inputs and internal reference, with COM pin serving as cold-junction reference node. Use Value: Supports Type K/J/E thermocouples with <0.1°C accuracy over –40°C to +85°C ambient - no external amplifiers or cold-junction ICs required.	Use Scenario: Multi-channel sensor logging in test equipment, environmental monitors, and predictive maintenance edge nodes. IC Role / Device Role / Timing Role: 8-channel scanning ADC acquiring synchronized samples at up to 500 Hz per channel (4 kHz total mux rate with external oscillator). Use Value: Delivers deterministic timing and zero inter-channel latency - enabling phase-coherent analysis of vibration, acoustic, or power quality signals.

Weight Scales

Auto-Ranging 6-Digit DVMs

Use Scenario: High-resolution load cell measurement in commercial and industrial weighing systems requiring NTEP/EC type approval.

IC Role / Device Role / Timing Role: Primary ADC capturing differential bridge output with 24-bit resolution, simultaneous 50/60 Hz rejection, and no-latency channel switching for multi-sensor calibration.

Use Value: Eliminates external anti-aliasing filters and digital post-processing, achieving <0.001% linearity and <1 µV offset drift over temperature - directly meeting OIML R76 Class III requirements.

Use Scenario: Benchtop and handheld digital multimeters performing auto-ranging AC/DC voltage, current, and resistance measurements.

IC Role / Device Role / Timing Role: Core 24-bit ADC providing programmable speed/resolution (6.9 Hz to 3.5 kHz) to match range changes while maintaining 0.0005% INL and 2 µV RMS noise.

Use Value: Enables true 6½-digit resolution at low speeds and fast 1000 readings/sec at reduced resolution - all with same hardware and no firmware recalibration.

Direct Temperature Measurement

High-Speed Data Acquisition

Use Scenario: Thermocouple-based temperature monitoring in HVAC, industrial ovens, and process control with cold-junction compensation.

IC Role / Device Role / Timing Role: Direct thermocouple digitization using differential inputs and internal reference, with COM pin serving as cold-junction reference node.

Use Value: Supports Type K/J/E thermocouples with <0.1°C accuracy over –40°C to +85°C ambient - no external amplifiers or cold-junction ICs required.

Use Scenario: Multi-channel sensor logging in test equipment, environmental monitors, and predictive maintenance edge nodes.

IC Role / Device Role / Timing Role: 8-channel scanning ADC acquiring synchronized samples at up to 500 Hz per channel (4 kHz total mux rate with external oscillator).

Use Value: Delivers deterministic timing and zero inter-channel latency - enabling phase-coherent analysis of vibration, acoustic, or power quality signals.

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
ADS1258IRHBT	16-channel, 24-bit, 125 kSPS max, but requires external reference and has 1-cycle latency; no simultaneous 50/60 Hz rejection built-in.	Higher throughput but less integrated filtering; suited for systems with FPGA-based digital filtering and tight timing budgets.	Select ADS1258IRHBT when maximum sample rate >4 kHz is required and external clock/data processing resources are available.
LTC2448CUHF#PBF	16-channel (8-differential) variant of same family; identical noise, INL, and no-latency architecture; shares same pinout and interface.	Supports double the input count without layout change - ideal for upgrading channel density in existing designs.	Select LTC2448CUHF#PBF when expanding from 8 to 16 inputs is needed while retaining identical performance and firmware compatibility.

Compared with ADS1258IRHBT, LTC2444CUHF#PBF delivers guaranteed 50/60 Hz rejection and true no-latency operation at lower power, while LTC2448CUHF#PBF offers direct pin-compatible channel expansion - making LTC2444CUHF#PBF optimal for compact, self-contained precision measurement where integration and deterministic timing are critical.

Availability

LTC2444CUHF#PBF 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 traceable sourcing for industrial OEM programs.

Supply support for LTC2444CUHF#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.

The LTC2444CUHF#PBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for high-accuracy, multi-channel industrial data acquisition where channel-switching speed, AC-line rejection, and long-term stability are non-negotiable.

FAQ

What is the maximum output data rate achievable with LTC2444CUHF#PBF?

The LTC2444CUHF#PBF achieves up to 3.5 kHz output rate using its internal oscillator, and up to 8 kHz when an external oscillator (0.1–12 MHz) is connected to the FO pin. In 2X speed mode, the maximum rate increases to 7 kHz (internal) or 8 kHz (external), with one-cycle latency - all while maintaining 24-bit resolution and no missing codes.

Does LTC2444CUHF#PBF require external components for basic operation?

No, the LTC2444CUHF#PBF operates with only a 10 µF tantalum + 0.1 µF ceramic capacitor on VCC and no external clock or reference components. Its internal oscillator, differential reference acceptance, and integrated auto-calibration eliminate the need for external crystal oscillators, precision references, or trim resistors - reducing BOM count and board area.

How does LTC2444CUHF#PBF handle input channel switching without latency?

The LTC2444CUHF#PBF uses a proprietary no-latency delta-sigma architecture where the first conversion after any channel, speed, or resolution change is fully accurate - no settling time or dummy conversions required. This enables deterministic 500 Hz scanning across all 8 channels (4 differential) with guaranteed DC accuracy on every sample.

What is the meaning of "SoftSpan" in relation to LTC2444CUHF#PBF?

"SoftSpan" is a trademarked feature of the LTC2444CUHF#PBF that enables seamless, glitch-free transitions between speed/resolution settings without disrupting the conversion cycle or introducing latency. It allows dynamic adjustment of OSR (oversampling ratio) and 1X/2X mode via SDI during data output - ensuring continuous, uninterrupted data flow even during reconfiguration.

Can LTC2444CUHF#PBF operate with a 3.3 V supply?

No, the LTC2444CUHF#PBF requires a 4.5 V to 5.5 V supply (V_CC). Its absolute maximum rating is 6 V, and operation below 4.5 V is not characterized or guaranteed. For 3.3 V systems, consider level-shifting the digital interface or selecting a different ADC family such as the AD717x series, but note that LTC2444CUHF#PBF itself is not 3.3 V compatible.

LTC2444CUHF#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:: 0°C ~ 70°C

Supplier Device Package:: 38-QFN (5x7)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

LTC2444CUHF#PBF FAQ

1.How can I place an order for LTC2444CUHF#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2444CUHF#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 LTC2444CUHF#PBF reliable?

The price and inventory of LTC2444CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2444CUHF#PBF is usually 5 days.

3.What payment methods are accepted for LTC2444CUHF#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2444CUHF#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2444CUHF#PBF?

LTC2444CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2444CUHF#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 LTC2444CUHF#PBF?

For technical support, including LTC2444CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2444CUHF#PBF requirements.

6.How does Aetrix verify that LTC2444CUHF#PBF is sourced from the original manufacturer or authorized distributors?

All LTC2444CUHF#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 LTC2444CUHF#PBF meets industry standards.

7.What is the process for return or replacement of LTC2444CUHF#PBF?

All LTC2444CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2444CUHF#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 LTC2444CUHF#PBF part is unused and in its original packaging.

Return procedure for LTC2444CUHF#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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