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Analog Devices Inc. LTC2439-1CGN#PBF
- Part No.:
- LTC2439-1CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2439-1CGN#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:185
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Product details
Overview
LTC2439-1CGN#PBF 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. It operates from 2.7V to 5.5V and supports flexible ratiometric sensing in industrial instrumentation and precision weight scales.
For engineers reviewing the LTC2439-1CGN#PBF datasheet, LTC2439-1CGN#PBF pinout, LTC2439-1CGN#PBF application, or LTC2439-1CGN#PBF equivalent, key selection criteria include 50/60 Hz simultaneous notch rejection, rail-to-rail differential input/reference support, 4-wire SPI/MICROWIRE interface compatibility, and autosleep mode consuming only 4 µA.
Technical Context
The LTC2439-1CGN#PBF implements a third-order delta-sigma modulator with decimating FIR filter, enabling true no-latency operation-each conversion yields one valid 16-bit output without settling delay. Its internal oscillator eliminates external timing components and guarantees ≥87 dB rejection at 50 Hz and 60 Hz ±2% simultaneously.
It supports dual operational modes via the FO pin: grounded for internal 50/60 Hz rejection, or driven externally (2.56–2000 kHz) to set custom notch frequencies. Input common-mode voltage (VINCM) and reference common-mode voltage (VREFCM) are independently configurable from GND to VCC, enabling remote sensing and wide-range ratiometric measurements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage across full-scale range. |
| INL | 0.12 LSB typical-ensures high linearity for precision sensor digitization without calibration overhead. |
| 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 in conversion mode; 4 µA in autosleep-supports battery-powered and energy-constrained data acquisition systems. |
| Input Range | ±0.5 × VREF bipolar differential-supports direct connection to strain gauges, thermocouples, and bridge sensors without signal conditioning. |
| Common-Mode Rejection | ≥140 dB DC and ≥140 dB at 49–61.2 Hz-rejects shared noise in noisy industrial environments. |
| Reference Range | 0.1 V to VCC differential-allows flexible ratiometric measurement with low-voltage sensors or remote references. |
Pinout & Package
Package: 28-lead plastic SSOP (GN), 0°C to 70°C operating temperature range, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH15 (Pins 1–8, 21–28) | Analog multiplexer inputs | Configurable as 16 single-ended or 8 differential channels; IN+ and IN– selected dynamically via SDI address bits. |
| COM (Pin 10) | Single-ended negative reference | Serves as common IN– for all single-ended conversions; 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 reference; VREFCM independently adjustable from GND to VCC. |
| CS (Pin 16) | Active-low chip select | Wakes device from sleep, enables SDO output, and controls state transitions between conversion, sleep, and data I/O. |
| SDO (Pin 17) | Three-state serial data output | Outputs 19-bit frame (EOC, DMY, SIG, 16-bit result); high-Z when CS = HIGH. |
| SCK (Pin 18) | Bidirectional serial clock | Functions as output (internal SCK mode) or input (external SCK mode); auto-detected at power-up or CS falling edge. |
| FO (Pin 19) | Frequency control input | Selects internal oscillator (50/60 Hz rejection) or external clock (custom notch frequency fEOSC/2560 ±4%). |
| SDI (Pin 20) | Serial data input | Accepts 8-bit channel address/control word on rising SCK edges; supports dynamic mux reconfiguration mid-operation. |
| GND (Pin 15) | Analog/digital ground | Low-impedance ground plane connection required; shared reference for analog and digital sections. |
| VCC (Pin 9) | Positive supply | 2.7 V to 5.5 V operation; requires local bypassing with 10 µF tantalum + 0.1 µF ceramic capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | Delivers one valid 16-bit result per conversion cycle-no filter settling delay, enabling true time-synchronized multiplexed sampling. |
| Autocalibration per conversion | Performs offset and full-scale correction every cycle-eliminates drift-induced errors without user intervention or system downtime. |
| Flexible 50/60 Hz rejection | 87 dB minimum simultaneous rejection at 50 Hz and 60 Hz ±2% with internal oscillator; FO pin allows external clock for custom notch tuning. |
| Rail-to-rail differential input/reference | Supports VINCM and VREFCM independently from GND to VCC-enables direct interfacing with sensors operating near supply rails. |
| Ultra-low transition noise | < 0.02 LSB-minimizes code flicker during stable input conditions, critical for high-resolution weigh scale and precision instrumentation. |
| Guaranteed modulator stability | Immune to lock-up under any valid input and reference condition-ensures robust operation in uncontrolled field environments. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
Use Scenario: High-precision load cell readout in platform scales and hopper weighing systems. IC Role / Device Role / Timing Role: Direct sensor digitizer converting mV-level bridge outputs with 16-bit resolution and <0.02 LSB transition noise. Use Value: Enables 1:30,000+ system resolution without external amplification or calibration, reducing BOM cost and board space. |
Use Scenario: Analog monitoring of pressure, flow, and level transmitters in PLC-based control loops. IC Role / Device Role / Timing Role: Multichannel front-end ADC acquiring 8 differential sensor inputs with simultaneous 50/60 Hz noise rejection. Use Value: Eliminates need for external notch filters or software averaging, simplifying firmware and improving real-time response. |
| Direct Temperature Measurement | Gas Analyzers |
Use Scenario: Cold-junction compensation and thermocouple voltage digitization in HVAC and furnace controllers. IC Role / Device Role / Timing Role: Differential ADC accepting thermocouple signals referenced to COM, with programmable gain-independent full-scale range. Use Value: Supports direct thermocouple connection without cold-junction ICs or op-amp signal conditioning, lowering system complexity. |
Use Scenario: Low-noise detection of electrochemical sensor outputs in portable gas detection instruments. IC Role / Device Role / Timing Role: Precision digitizer for nA-level current-to-voltage converted signals, leveraging 1 µV RMS noise floor. Use Value: Achieves sub-ppm gas concentration resolution using low-reference configurations (e.g., 100 mV → 1.5 µV/LSB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit multichannel delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBSR | 24-bit resolution, integrated PGA (1–128×), lower noise (0.15 µV RMS), but higher supply current (350 µA active) and no internal 50/60 Hz notch. | Preferred for ultra-high-resolution RTD or thermistor measurement; less suitable for line-noise-heavy AC environments without external filtering. | Select when resolution >16-bit and programmable gain are required; avoid if 50/60 Hz rejection must be hardware-embedded and low-power autosleep is critical. |
| LTC2418CGN#PBF | 24-bit resolution, pin-compatible 28-SSOP package, identical 50/60 Hz notch and interface, but higher supply current (250 µA) and no autosleep mode. | Drop-in upgrade path for higher resolution where power budget allows; shares same layout and firmware interface. | Choose for resolution-critical upgrades without PCB revision; not suitable for battery-powered or <10 µA sleep-current designs. |
Compared with ADS124S08IPBSR and LTC2418CGN#PBF, the LTC2439-1CGN#PBF uniquely balances 16-bit precision, 4 µA autosleep, and hardware-embedded 50/60 Hz rejection-making it optimal for cost-sensitive, line-powered industrial sensors where 16-bit fidelity suffices and layout simplicity is prioritized.
Availability
LTC2439-1CGN#PBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and battery-assisted weigh scale applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2439-1CGN#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 LTC2439-1CGN#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in industrial, medical, and test equipment where noise immunity and ease of use are critical.
FAQ
What is the operating temperature range for the LTC2439-1CGN#PBF?
The LTC2439-1CGN#PBF is specified for commercial-grade operation from 0°C to 70°C. This is confirmed by the "C" suffix in the part number and the "LTC2439-1C" designation in the Absolute Maximum Ratings table. The "I" grade variant (LTC2439-1IGN#PBF) supports –40°C to 85°C, but the LTC2439-1CGN#PBF itself is strictly 0°C to 70°C.
Does the LTC2439-1CGN#PBF require external passive components for its internal oscillator?
No, the LTC2439-1CGN#PBF does not require external passive components for its internal oscillator. As stated in the DESCRIPTION section: "The internal oscillator requires no external frequency setting components." When FO is grounded, the device uses this fully integrated oscillator to achieve simultaneous 50 Hz and 60 Hz rejection-no crystals, capacitors, or resistors are needed.
Can the LTC2439-1CGN#PBF operate with a 100 mV reference voltage while maintaining 16-bit effective resolution?
Yes-the LTC2439-1CGN#PBF accepts VREF as low as 0.1 V and achieves a 1.5 µV LSB step size at that level. With 1 µV RMS noise independent of VREF, the effective resolution improves: at 100 mV reference, quantization noise (1.5 µV) dominates thermal noise (1 µV), yielding >16-bit ENOB in practice. This is explicitly validated in the "Operates with a Reference as Low as 100mV" feature and Figure TA02.
How does the LTC2439-1CGN#PBF handle overrange and underrange conditions?
The LTC2439-1CGN#PBF uses dedicated status bits in its 19-bit output frame to indicate overrange and underrange. Specifically, Bits 16 and 15 (SIG and MSB) together encode these states: both LOW indicates VIN < –0.5 × VREF (underrange); both HIGH indicates VIN > +0.5 × VREF (overrange). These are distinct, non-overlapping codes-not clamped values-allowing unambiguous fault detection in real time.
Is the LTC2439-1CGN#PBF pin-compatible with the 24-bit LTC2418?
Yes-the LTC2439-1CGN#PBF is explicitly stated to be "Pin Compatible with the 24-Bit LTC2418" in the FEATURES list. Both devices use the identical 28-lead SSOP (GN) package and share identical pin functions, power sequencing, and 4-wire SPI/MICROWIRE interface timing-enabling direct layout reuse and firmware compatibility for resolution-flexible design migration.
LTC2439-1CGN#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2439-1CGN#PBF FAQ
1.How can I place an order for LTC2439-1CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2439-1CGN#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 LTC2439-1CGN#PBF reliable?
The price and inventory of LTC2439-1CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2439-1CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2439-1CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2439-1CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2439-1CGN#PBF?
LTC2439-1CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2439-1CGN#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 LTC2439-1CGN#PBF?
For technical support, including LTC2439-1CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2439-1CGN#PBF requirements.
6.How does Aetrix verify that LTC2439-1CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2439-1CGN#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 LTC2439-1CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2439-1CGN#PBF?
All LTC2439-1CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2439-1CGN#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 LTC2439-1CGN#PBF part is unused and in its original packaging.
Return procedure for LTC2439-1CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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