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Analog Devices Inc. LTC2439-1CGN#TRPBF
- Part No.:
- LTC2439-1CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2439-1CGN#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
LTC2439-1CGN#TRPBF from Analog Devices (formerly Linear Technology) is a 16-channel (8-differential), 16-bit no-latency delta-sigma ADC with integrated oscillator, 0.12 LSB INL, 1 µV RMS noise, and single-cycle settling for multiplexed sensor digitization. It operates from 2.7 V to 5.5 V and supports flexible ratiometric measurements using external differential reference voltages as low as 100 mV.
For engineers reviewing the LTC2439-1CGN#TRPBF datasheet, LTC2439-1CGN#TRPBF pinout, LTC2439-1CGN#TRPBF application, or LTC2439-1CGN#TRPBF equivalent, key selection considerations include its 87 dB simultaneous 50/60 Hz notch rejection, rail-to-rail differential input/reference capability, 4-wire SPI/MICROWIRE interface, autosleep current of 4 µA, and guaranteed 16-bit no-missing-codes performance across temperature.
Technical Context
The LTC2439-1CGN#TRPBF implements a third-order delta-sigma modulator with decimating FIR filtering and on-chip autocalibration that corrects offset and full-scale errors in every conversion cycle. Its digital filter provides fixed 87 dB rejection at 50 Hz and 60 Hz ±2% when FO = GND, or user-defined notch frequencies via external oscillator input (2.56–2000 kHz) on the FO pin.
It uses a flexible 4-wire serial interface where SCK operates bidirectionally-outputting internal clock during data transfer (FO = GND) or accepting external clock (FO driven). Channel selection is updated via 8-bit SDI word with control bits (EN, SGL, ODD/SIGN) enabling 16 single-ended or 8 differential configurations, all referenced to COM or paired channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and unambiguous code mapping over full input range. |
| INL | 0.12 LSB typical - ensures high linearity for precision weight scales and strain gauge transducers. |
| Noise | 1 µV RMS - independent of VREF; 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 instrumentation and portable gas analyzers. |
| Common Mode Rejection | 140 dB DC - allows accurate measurement of small differential signals in noisy industrial environments. |
| Notch Rejection | 87 dB at 50/60 Hz simultaneously - eliminates mains interference without external filtering or software post-processing. |
| Reference Range | 0.1 V to VCC - supports ratiometric sensing with low-voltage bridges and remote RTD/thermocouple conditioning. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 0°C to 70°C operating temperature range, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH15 (Pins 1–8, 21–28) | Analog multiplexer inputs | Configurable as 16 single-ended (vs. COM) or 8 differential pairs; support bipolar input range of ±0.5·VREF. |
| COM (Pin 10) | Common negative input | Reference node for all single-ended channels; voltage range extends from GND – 0.3 V to VCC + 0.3 V. |
| REF+ / REF– (Pins 11/12) | Differential reference inputs | Accept 0.1 V to VCC differential voltage; common-mode range spans GND to VCC independently. |
| FO (Pin 19) | Frequency control input | Selects internal oscillator (50/60 Hz rejection) or external clock (2.56–2000 kHz) for programmable notch frequency. |
| CS (Pin 16) | Active-low chip select | Wakes device from sleep, enables SDO output, and controls state transitions between conversion/data I/O modes. |
| SCK (Pin 18) | Bidirectional serial clock | Outputs internal clock during data readout (FO = GND) or accepts external clock (FO driven); auto-configured at power-up. |
| SDI / SDO (Pins 20 / 17) | Serial data in/out | SDI accepts 8-bit channel address; SDO outputs 19-bit frame (EOC, sign, 16-bit result) synchronized to SCK falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| No latency delta-sigma architecture | Single-cycle settling enables true time-synchronized sampling across 16 channels without filter delay or data redundancy. |
| Integrated oscillator | Eliminates external crystal/capacitor components; guarantees stable 50/60 Hz rejection without calibration or layout sensitivity. |
| Autocalibration per conversion | Corrects offset and full-scale drift in real time - maintains accuracy over temperature, supply variation, and long-term aging. |
| Rail-to-rail differential I/O | Supports input and reference common-mode voltages from GND – 0.3 V to VCC + 0.3 V - simplifies interfacing with op-amp front-ends and isolated sensors. |
| Low transition noise | < 0.02 LSB - minimizes code flicker during static measurements critical for high-resolution weigh scales and precision instrumentation. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-precision load cell readout in commercial and industrial weighing systems with AC mains noise. IC Role / Device Role / Timing Role: Direct digitizer for millivolt-level bridge outputs; performs ratiometric conversion using bridge excitation as reference. Use Value: 87 dB 50/60 Hz rejection eliminates need for external notch filters; 1 µV RMS noise enables sub-gram resolution with 100 mV reference. |
Use Scenario: Cold-junction compensation and thermocouple voltage digitization in HVAC and process control. IC Role / Device Role / Timing Role: Simultaneous acquisition of thermocouple (differential) and RTD (single-ended vs. COM) channels. Use Value: Independent VINCM and VREFCM ranges allow separate biasing of thermocouple and RTD circuits; 140 dB CMRR rejects common-mode noise from heater elements. |
| Gas Analyzers | Industrial Process Control |
Use Scenario: Low-power, battery-operated electrochemical gas sensor signal conditioning with long-term stability requirements. IC Role / Device Role / Timing Role: Digitizer for microamp-level transducer currents converted to voltage via precision shunt resistor. Use Value: 4 µA autosleep current extends battery life; 0.12 LSB INL ensures calibrated gas concentration accuracy over full temperature range. |
Use Scenario: Modular I/O module for PLC analog input cards requiring high channel density and immunity to factory EMI. IC Role / Device Role / Timing Role: 16-channel front-end ADC with configurable single-ended/differential mode per channel pair. Use Value: Pin compatibility with LTC2418 allows migration path to 24-bit resolution; SSOP package supports compact PCB layout in space-constrained DIN-rail enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, integrated PGA and burnout current sources; requires external reference; 2.5 V min supply. | Better suited for low-level thermistor/RTD arrays requiring gain; less optimal for direct ratiometric bridge sensing without external reference scaling. | Choose ADS124S08IPWR when higher resolution and on-chip excitation are needed; LTC2439-1CGN#TRPBF remains preferred for low-power, reference-flexible, no-PGA applications. |
| LTC2418CGN#TRPBF | 24-bit version, identical pinout and interface; higher INL (±2 ppm FS), 350 µA active current, same 50/60 Hz rejection. | Targeted at metrology-grade applications where 24-bit resolution justifies higher cost and power; shares same layout and firmware compatibility. | LTC2418CGN#TRPBF is a drop-in upgrade path for resolution-critical designs; LTC2439-1CGN#TRPBF offers optimal balance of 16-bit precision, ultra-low sleep current, and cost. |
Compared with ADS124S08IPWR and LTC2418CGN#TRPBF, the LTC2439-1CGN#TRPBF delivers superior power efficiency in autosleep mode (4 µA vs. ≥10 µA), broader reference voltage range (0.1 V–VCC vs. fixed 2.048 V or external ≥2.5 V), and simpler BOM due to integrated oscillator - making it ideal for cost-sensitive, battery-powered, or reference-flexible sensor nodes.
Availability
LTC2439-1CGN#TRPBF is available at Aetrix Electronics and suitable for weight scales, gas analyzers, direct temperature measurement, and industrial process control requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC2439-1CGN#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 acquired Linear Technology in 2017 and maintains its precision analog product lines with emphasis on high-performance signal chain solutions.
The LTC2439-1CGN#TRPBF belongs to Linear's No Latency ΔΣ™ ADC family, designed specifically for high-accuracy, low-power, multiplexed sensor digitization in industrial, medical, and test equipment where simultaneous rejection of 50/60 Hz interference and minimal system-level component count are critical.
FAQ
What is the minimum reference voltage supported by the LTC2439-1CGN#TRPBF?
The LTC2439-1CGN#TRPBF supports an external differential reference voltage as low as 0.1 V (100 mV) while maintaining 1 µV RMS noise and 1.5 µV LSB step size. This enables high effective resolution for low-level sensor outputs such as microvolt-range thermocouples or millivolt-output strain gauges, without requiring gain stages or external amplification before digitization.
How does the LTC2439-1CGN#TRPBF achieve 50 Hz and 60 Hz simultaneous rejection?
The LTC2439-1CGN#TRPBF achieves simultaneous 50 Hz and 60 Hz rejection through its on-chip digital FIR filter, which is synchronized to its internal oscillator when the FO pin is grounded. The filter provides ≥87 dB attenuation across 49 Hz to 61.2 Hz, eliminating mains-induced noise without external hardware or software compensation - a key advantage in industrial and laboratory environments.
Can the LTC2439-1CGN#TRPBF operate in single-ended mode?
Yes, the LTC2439-1CGN#TRPBF can be configured for 16 single-ended input channels using the COM pin as the common negative reference. This is selected via the SGL bit in the 8-bit SDI address word. Each single-ended channel supports rail-to-rail common-mode input (GND – 0.3 V to VCC + 0.3 V) and full-scale range of ±0.5·VREF, matching the differential mode's dynamic range.
What is the conversion time of the LTC2439-1CGN#TRPBF with internal oscillator?
With the FO pin grounded and internal oscillator enabled, the LTC2439-1CGN#TRPBF has a typical conversion time of 145 ms. This value is fixed and deterministic, enabling precise timing control in synchronous data acquisition systems. Conversion time remains stable across temperature and supply voltage variations due to the integrated oscillator's accuracy.
Is the LTC2439-1CGN#TRPBF pin-compatible with any other ADCs?
Yes, the LTC2439-1CGN#TRPBF is pin-compatible with the 24-bit LTC2418, sharing identical 28-lead SSOP footprint, pin functions, and 4-wire SPI/MICROWIRE interface. This allows direct hardware replacement or scalable design migration - for example, using LTC2439-1CGN#TRPBF in prototyping or cost-sensitive production, then upgrading to LTC2418 for higher resolution without PCB redesign.
LTC2439-1CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2439-1CGN#TRPBF FAQ
1.How can I place an order for LTC2439-1CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2439-1CGN#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 LTC2439-1CGN#TRPBF reliable?
The price and inventory of LTC2439-1CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2439-1CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2439-1CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2439-1CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2439-1CGN#TRPBF?
LTC2439-1CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2439-1CGN#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 LTC2439-1CGN#TRPBF?
For technical support, including LTC2439-1CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2439-1CGN#TRPBF requirements.
6.How does Aetrix verify that LTC2439-1CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2439-1CGN#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 LTC2439-1CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2439-1CGN#TRPBF?
All LTC2439-1CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2439-1CGN#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 LTC2439-1CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC2439-1CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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