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

Analog Devices Inc. LTC2439-1IGN#PBF

Name: LTC2439-1IGN#PBF
Brand: Analog Devices Inc.
SKU: LTC2439-1IGN#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2439-1IGN#PBF

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 28-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC2439-1IGN#PBF.pdf

Description:: IC ADC 16BIT SIGMA-DELTA 28SSOP

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Product details

Overview

LTC2439-1IGN#PBF from Analog Devices (formerly Linear Technology) is a 16-channel (8-differential), micropower, 16-bit delta-sigma ADC with no latency, 1 µV RMS noise, 0.12 LSB INL, and single-cycle settling for multiplexed measurements. It operates from 2.7V to 5.5V, supports rail-to-rail differential input/reference, and is used in precision industrial sensor digitization where low power, high CMRR (>140 dB DC), and simultaneous 50/60 Hz rejection are critical.

For engineers reviewing the LTC2439-1IGN#PBF datasheet, LTC2439-1IGN#PBF pinout, LTC2439-1IGN#PBF application, or LTC2439-1IGN#PBF equivalent, key selection considerations include its 28-lead SSOP package, internal oscillator eliminating external timing components, flexible 4-wire SPI/MICROWIRE interface, and support for 0.1V–V_CC differential reference voltage - enabling ratiometric remote sensing and low-voltage transducer interfacing.

Technical Context

The LTC2439-1IGN#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filtering, delivering true 16-bit no-missing-codes performance and guaranteed modulator stability under all input/reference conditions. Its autocalibration engine performs offset and full-scale correction every conversion cycle, ensuring long-term drift immunity without user intervention.

It supports two clocking modes: internal oscillator (fixed 50/60 Hz notch at 87 dB min rejection) or external frequency control via FO pin (rejection tunable to f_EOSC/2560 ±4% at 110 dB min). Input common mode range (GND–0.3V to V_CC+0.3V) and reference common mode range (GND to V_CC) are independently configurable, enabling direct connection to strain gauges, thermocouples, and bridge sensors without level-shifting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit, no missing codes - guarantees monotonicity and unambiguous digital representation across full input range.
INL	0.12 LSB max - ensures <±0.0019% full-scale linearity error for high-accuracy calibration-critical systems.
Noise	1 µV RMS - independent of V_REF; enables effective resolution improvement when using low reference voltages (e.g., 100 mV → 1.5 µV/LSB).
Supply Current	200 µA active / 4 µA autosleep - supports battery-powered data loggers and energy-harvesting nodes with multi-year runtime.
CMRR (DC)	>140 dB - rejects common-mode interference from noisy industrial grounds or shared supply rails.
50/60 Hz Rejection	87 dB min simultaneous - eliminates mains-induced errors without external notch filters or software averaging.
Input Range	±0.5 × V_REF, V_REF = 0.1V to V_CC - supports direct digitization of microvolt-level signals from low-output sensors.

Pinout & Package

Package: 28-lead plastic SSOP (GN), –40°C to +85°C operating temperature range, lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
CH0–CH15 (Pins 1–8, 21–28)	Analog input channels	Configurable as 16 single-ended (vs. COM) or 8 differential pairs; support bipolar input up to ±0.5×V_REF.
COM (Pin 10)	Common negative input	Reference node for all single-ended measurements; voltage range extends beyond GND/V_CC (GND–0.3V to V_CC+0.3V).
REF+, REF– (Pins 11, 12)	Differential reference inputs	Accept 0.1V–V_CC differential voltage; common-mode range fully independent of input common-mode.
VCC (Pin 9), GND (Pin 15)	Power supply	2.7V–5.5V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass per datasheet layout guidelines.
CS (Pin 16)	Active-low chip select	Controls power state: LOW wakes ADC and enables SDO; HIGH forces autosleep (4 µA) and tri-states output.
SDO (Pin 17)	3-state serial data output	Outputs 19-bit frame (EOC, DMY, SIG, 16-bit result); high-impedance when CS = HIGH.
SCK (Pin 18)	Bidirectional serial clock	Functions as output (internal clock mode) or input (external clock mode); weak internal pull-up active in output mode.
FO (Pin 19)	Frequency control	GND = internal oscillator (50/60 Hz rejection); driven = external clock (f_EOSC = 2.56–2000 kHz) for custom notch tuning.
SDI (Pin 20)	Serial data input	Accepts 8-bit channel address (3 control + 5 address bits) on rising SCK edges to reconfigure MUX before next conversion.
NC (Pins 13, 14)	No connect	Not internally bonded; must remain unconnected or tied to GND per layout best practice.

Key Features

Feature	Design Value
No-latency delta-sigma architecture	Single-cycle settling enables deterministic timing for real-time multiplexed sensor arrays without filter delay uncertainty.
Per-conversion auto-calibration	Eliminates need for external zero/gain calibration routines; maintains <±5 µV offset error and <±0.16 LSB full-scale error over temperature and supply variation.
Flexible reference interface	Supports 0.1V–V_CC differential reference with independent common-mode control - enables ratiometric bridge measurements and isolated sensor interfaces.
Ultra-low transition noise	<0.02 LSB - prevents code flicker during stable DC measurements, critical for weight scale and precision instrumentation applications.
Guaranteed modulator lock-up immunity	Operates reliably under any input/reference condition (including overrange, underrange, or floating inputs) without requiring system-level watchdog or reset logic.

Applications

Direct Sensor Digitization	Industrial Process Control
Use Scenario: Direct connection of low-output transducers (e.g., load cells, RTDs, thermocouples) to ADC without signal conditioning amplifiers. IC Role / Device Role / Timing Role: Precision analog front-end digitizer with integrated reference buffer, programmable gainless MUX, and 16-bit resolution. Use Value: Reduces BOM count by eliminating op-amps, PGA stages, and external reference ICs while maintaining 1 µV RMS noise floor and >140 dB CMRR.	Use Scenario: Monitoring multiple analog process variables (pressure, flow, temperature) in PLC I/O modules with strict EMC and long-term stability requirements. IC Role / Device Role / Timing Role: Multichannel, low-drift ADC with simultaneous 50/60 Hz rejection for factory-floor environments with heavy AC motor noise. Use Value: Enables single-chip acquisition of 8 differential or 16 single-ended channels with <±0.002% total unadjusted error and autosleep current <5 µA for standby monitoring.
Weight Scales & Load Cells	Gas Analyzers & Environmental Sensors
Use Scenario: High-resolution weighing systems requiring sub-gram resolution and thermal drift compensation over wide ambient ranges. IC Role / Device Role / Timing Role: Bridge sensor digitizer with rail-to-rail differential input, 0.12 LSB INL, and per-conversion offset calibration. Use Value: Achieves <1 ppm linearity error and <5 µV offset drift over –40°C to +85°C, eliminating need for periodic recalibration in commercial scales.	Use Scenario: Portable gas detection units measuring electrochemical or NDIR sensor outputs with ultra-low power budget and high noise immunity. IC Role / Device Role / Timing Role: Low-power, high-CMRR ADC for microamp-level sensor currents converted via precision shunt resistors. Use Value: Delivers 16-bit resolution at 4 µA sleep current and 1 µV RMS noise - enabling >12-hour battery life in handheld analyzers while rejecting EMI from display backlighting and RF modules.

Direct Sensor Digitization

Industrial Process Control

Use Scenario: Direct connection of low-output transducers (e.g., load cells, RTDs, thermocouples) to ADC without signal conditioning amplifiers.

IC Role / Device Role / Timing Role: Precision analog front-end digitizer with integrated reference buffer, programmable gainless MUX, and 16-bit resolution.

Use Value: Reduces BOM count by eliminating op-amps, PGA stages, and external reference ICs while maintaining 1 µV RMS noise floor and >140 dB CMRR.

Use Scenario: Monitoring multiple analog process variables (pressure, flow, temperature) in PLC I/O modules with strict EMC and long-term stability requirements.

IC Role / Device Role / Timing Role: Multichannel, low-drift ADC with simultaneous 50/60 Hz rejection for factory-floor environments with heavy AC motor noise.

Use Value: Enables single-chip acquisition of 8 differential or 16 single-ended channels with <±0.002% total unadjusted error and autosleep current <5 µA for standby monitoring.

Weight Scales & Load Cells

Gas Analyzers & Environmental Sensors

Use Scenario: High-resolution weighing systems requiring sub-gram resolution and thermal drift compensation over wide ambient ranges.

IC Role / Device Role / Timing Role: Bridge sensor digitizer with rail-to-rail differential input, 0.12 LSB INL, and per-conversion offset calibration.

Use Value: Achieves <1 ppm linearity error and <5 µV offset drift over –40°C to +85°C, eliminating need for periodic recalibration in commercial scales.

Use Scenario: Portable gas detection units measuring electrochemical or NDIR sensor outputs with ultra-low power budget and high noise immunity.

IC Role / Device Role / Timing Role: Low-power, high-CMRR ADC for microamp-level sensor currents converted via precision shunt resistors.

Use Value: Delivers 16-bit resolution at 4 µA sleep current and 1 µV RMS noise - enabling >12-hour battery life in handheld analyzers while rejecting EMI from display backlighting and RF modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel precision ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS124S08IPWR	24-bit resolution, integrated PGA (1–128×), lower noise (0.15 µV RMS), but higher supply current (350 µA active) and no internal oscillator.	Requires external crystal or clock source; better suited for ultra-high-resolution applications where PGA gain flexibility outweighs power penalty.	Select ADS124S08IPWR when 24-bit resolution and programmable gain are mandatory, and system can accommodate higher active current and external timing.
LTC2418CGN#PBF	24-bit resolution, pin-compatible 28-SSOP package, identical interface and timing, but higher supply current (350 µA) and no autosleep mode.	Lacks 4 µA autosleep; not suitable for battery-powered intermittent-read applications requiring ultra-low quiescent power.	Select LTC2418CGN#PBF only when 24-bit resolution is required and continuous conversion duty cycle justifies higher average current.

Compared with ADS124S08IPWR and LTC2418CGN#PBF, the LTC2439-1IGN#PBF uniquely balances 16-bit precision, 4 µA autosleep, internal oscillator, and simultaneous 50/60 Hz rejection - making it optimal for cost-sensitive, battery-operated, or space-constrained industrial sensor nodes where 16-bit resolution suffices and lowest possible active/sleep current is critical.

Availability

LTC2439-1IGN#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and battery-powered sensor networks requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term lifecycle continuity.

Supply support for LTC2439-1IGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2439-1IGN#PBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC family, designed specifically for low-power, high-accuracy multichannel sensor digitization in harsh industrial and portable environments.

FAQ

What is the operating temperature range of the LTC2439-1IGN#PBF?

The LTC2439-1IGN#PBF is rated for –40°C to +85°C operation (industrial grade), as confirmed by its "I" suffix and Absolute Maximum Ratings table. This range supports deployment in demanding environments such as factory automation, outdoor environmental monitors, and vehicle-mounted test equipment where ambient temperatures exceed commercial limits.

Does the LTC2439-1IGN#PBF require external passive components for its internal oscillator?

No, the LTC2439-1IGN#PBF integrates a precision internal oscillator that requires no external capacitors, crystals, or resistors. When the FO pin is tied to GND, the device automatically uses this oscillator to achieve simultaneous 50 Hz and 60 Hz notch filtering at ≥87 dB rejection - simplifying PCB layout and reducing BOM cost versus discrete timing solutions.

Can the LTC2439-1IGN#PBF operate with a 0.1V reference voltage?

Yes, the LTC2439-1IGN#PBF accepts differential reference voltages from 0.1V to V_CC. At 0.1V reference, the LSB step size is 1.5 µV, and the 1 µV RMS noise remains unchanged - yielding improved effective resolution for low-level sensor signals. This capability is explicitly guaranteed in the Electrical Characteristics table and Applications Information section.

How does the LTC2439-1IGN#PBF handle input overrange and underrange conditions?

The LTC2439-1IGN#PBF generates unique overrange and underrange output codes when the differential input exceeds ±0.5 × V_REF. These conditions are flagged in the 19-bit output stream: Bits 16 and 15 both HIGH indicate overrange; both LOW indicate underrange. This allows firmware to detect sensor faults, open circuits, or out-of-range excitation without additional comparator circuitry.

Is the LTC2439-1IGN#PBF pin-compatible with other devices in the same family?

Yes, the LTC2439-1IGN#PBF is pin-compatible with the 24-bit LTC2418 in the same 28-lead SSOP package, as stated in the Features list. This allows hardware reuse across resolution tiers - for example, using LTC2439-1IGN#PBF for cost-sensitive 16-bit designs and LTC2418 for higher-accuracy variants - without PCB redesign.

LTC2439-1IGN#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: microPOWER™

Package/Case:: 28-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Number of Bits:: 16

Sampling Rate (Per Second):: 6.8

Number of Inputs:: 8, 16

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:: 2.7V ~ 5.5V

Voltage - Supply, Digital:: 2.7V ~ 5.5V

Features:: -

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 28-SSOP

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

LTC2439-1IGN#PBF FAQ

1.How can I place an order for LTC2439-1IGN#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2439-1IGN#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 LTC2439-1IGN#PBF reliable?

The price and inventory of LTC2439-1IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2439-1IGN#PBF is usually 5 days.

3.What payment methods are accepted for LTC2439-1IGN#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2439-1IGN#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2439-1IGN#PBF?

LTC2439-1IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2439-1IGN#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 LTC2439-1IGN#PBF?

For technical support, including LTC2439-1IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2439-1IGN#PBF requirements.

6.How does Aetrix verify that LTC2439-1IGN#PBF is sourced from the original manufacturer or authorized distributors?

All LTC2439-1IGN#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 LTC2439-1IGN#PBF meets industry standards.

7.What is the process for return or replacement of LTC2439-1IGN#PBF?

All LTC2439-1IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2439-1IGN#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 LTC2439-1IGN#PBF part is unused and in its original packaging.

Return procedure for LTC2439-1IGN#PBF:

1.Submit a request within 90 days.

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

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