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Analog Devices Inc. LTC2495CUHF#PBF
- Part No.:
- LTC2495CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2495CUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:934
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Product details
Overview
LTC2495CUHF#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 16-channel (8 differential) delta-sigma ADC with integrated PGA, Easy Drive input architecture, I²C interface, and on-chip temperature sensor. It delivers 2 ppm INL, 1 µV offset error, 600 nV RMS noise, and programmable gain up to 256 - enabling direct digitization of rail-to-rail, high-impedance sensor signals in industrial data acquisition systems.
For engineers reviewing the LTC2495CUHF#PBF datasheet, LTC2495CUHF#PBF pinout, LTC2495CUHF#PBF application, or LTC2495CUHF#PBF equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for precision multichannel sensing designs requiring simultaneous 50/60 Hz rejection and zero-latency conversion.
Technical Context
The LTC2495CUHF#PBF employs a 3rd-order delta-sigma modulator with decimating FIR filter and automatic per-conversion offset/full-scale calibration. Its Easy Drive architecture eliminates differential input current errors via dynamic cancellation, allowing direct connection of sensors with source impedances >1 MΩ without external buffering.
It supports dual-speed operation (1×/2×), programmable 50 Hz / 60 Hz / simultaneous 50+60 Hz rejection, and flexible input configuration (single-ended or differential across CH0–CH15 with COM). The internal oscillator runs at 307.2 kHz (fO = GND), and conversion time is 131–164 ms in normal mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage over full input range. |
| INL | 2 ppm of VREF - enables sub-μV-level linearity-critical measurements in precision instrumentation. |
| Offset Error | ±0.5 µV (typ) - eliminates need for system-level offset trimming in low-drift sensor interfaces. |
| RMS Noise | 600 nV (1× speed, GAIN=256) - supports 19.5 ENOB at DC with minimal averaging. |
| Input Common Mode Range | GND to VCC - allows direct digitization of rail-to-rail sensor outputs without level-shifting circuitry. |
| Programmable Gain | 1 to 256 in 8 steps - matches full-scale range to signal amplitude while preserving resolution and SNR. |
| Temperature Sensor Accuracy | ±2°C absolute, 0.5°C resolution - enables on-chip thermal compensation without external sensor. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN (UHF), exposed pad (Pin 39) tied to GND. Requires soldering of exposed pad for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 6, 31–34) | Ground reference | Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance PCB ground plane. |
| SCL (Pin 2) | I²C clock input | Slave-only interface; rising edge clocks data into device, falling edge clocks data out - requires external master clock ≤400 kHz. |
| SDA (Pin 3) | I²C bidirectional data | Open-drain output during read; high-impedance input during write - requires pull-up to VCC (typically 4.7 kΩ). |
| COM (Pin 7) | Common negative input | Reference node for all single-ended channels; supports rail-to-rail common-mode voltage (GND–0.3V to VCC+0.3V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; each pair (e.g., CH0/CH1) forms a differential channel. |
| MUXOUTP/N (Pins 24, 27) | Multiplexer outputs | Enable sharing of external amplifiers across all channels; supports auto-calibrated external gain stages. |
| ADCINP/N (Pins 25, 26) | ADC analog inputs | Direct connection point for buffered signals; bypasses internal multiplexer - used when external amplifier drives ADC directly. |
| REF+/REF– (Pins 29, 30) | Differential reference inputs | Set full-scale range (±0.5·VREF/Gain); VREF = REF+ – REF– must be ≥0.1 V and ≤VCC. |
| fO (Pin 35) | Frequency control | GND selects internal 307.2 kHz oscillator; external clock overrides for custom data rates and notch tuning. |
| CA0–CA2 (Pins 36–38) | I²C address bits | Three-state (LOW/HIGH/FLOAT) configuration enables up to 27 unique I²C addresses plus global sync command. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency ΔΣ Conversion | Digital filter settles in one cycle - first result after channel change is fully accurate, eliminating wait states in multiplexed systems. |
| Easy Drive Input Architecture | Zero net differential input current - removes bias current errors and enables direct connection to high-Z pH, thermocouple, or bridge sensors. |
| Integrated Temperature Sensor | On-die PTAT element with ±2°C absolute accuracy - supports real-time thermal drift compensation without external components. |
| Simultaneous 50 Hz / 60 Hz Rejection | Single-conversion rejection of both line frequencies - critical for global industrial equipment operating in mixed-grid environments. |
| Auto-Calibration per Conversion | Continuous offset and full-scale correction - maintains accuracy across temperature, supply, and time without user intervention. |
Applications
| Industrial Process Monitoring | Medical Sensor Interface |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, flow, and temperature in PLC-based factory automation systems with mixed 50/60 Hz AC power environments. IC Role / Device Role / Timing Role: Primary multichannel ADC digitizing 8 differential sensor outputs with simultaneous line-frequency rejection and on-chip thermal compensation. Use Value: Eliminates external anti-aliasing filters and calibration circuitry while delivering 16-bit accuracy across 0°C to 70°C operating range. |
Use Scenario: Low-power, high-accuracy front-end for portable patient monitors measuring ECG, SpO₂, and temperature. IC Role / Device Role / Timing Role: Precision analog capture engine with rail-to-rail input support and ultra-low 0.8 mW power consumption at 7.5 Hz output rate. Use Value: Enables battery life extension via sleep-mode current of 1 µA while maintaining diagnostic-grade linearity and noise performance. |
| Environmental Data Logger | Test & Measurement Equipment |
|
Use Scenario: Long-term field deployment of wireless environmental sensors logging air quality, humidity, and ambient temperature. IC Role / Device Role / Timing Role: Direct sensor digitizer interfacing to thermistors, RTDs, and gas sensors with integrated temperature reference and programmable gain. Use Value: Reduces BOM count by integrating PGA, reference buffer, oscillator, and temperature sensor - simplifying layout and qualification. |
Use Scenario: Modular benchtop instruments requiring flexible input scaling and high DC accuracy for calibration traceability. IC Role / Device Role / Timing Role: High-stability measurement core supporting 2 ppm INL and 15 ppm full-scale error - compliant with ISO/IEC 17025 requirements. Use Value: Delivers metrology-grade performance without oven-controlled references or manual recalibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS114S08BIPBSR | 16-bit, 12-channel, SPI interface; no integrated temperature sensor; 125 nV RMS noise (lower than LTC2495); requires external reference. | Preferred where SPI bus is standard and lower noise dominates over I²C simplicity; lacks on-chip thermal sensing for self-compensation. | Select when system already uses SPI infrastructure and demands lowest possible noise floor - but accept added reference and thermal design complexity. |
| MAX11206ETX+T | 18-bit, 8-channel, I²C interface; 2.5 µV offset; no programmable gain; 500 nV RMS noise; operates down to 2.7V. | Better resolution and lower noise, but fixed gain limits dynamic range adaptation; no simultaneous 50/60 Hz rejection mode. | Choose for higher-resolution DC measurements where gain flexibility and dual-line rejection are secondary to raw ENOB and offset stability. |
Compared with ADS114S08BIPBSR and MAX11206ETX+T, the LTC2495CUHF#PBF uniquely combines I²C simplicity, integrated temperature sensing, simultaneous 50/60 Hz rejection, and Easy Drive input architecture - making it optimal for cost-sensitive, space-constrained industrial sensor nodes requiring self-calibrating, maintenance-free operation.
Availability
LTC2495CUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, portable medical devices, environmental data loggers, and test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC2495CUHF#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 LTC2495CUHF#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for low-power, multichannel sensor digitization in harsh industrial and portable environments where accuracy, ease of use, and robustness are critical.
FAQ
What is the operating temperature range of the LTC2495CUHF#PBF?
The LTC2495CUHF#PBF is specified for operation from 0°C to 70°C (Commercial grade). This range is confirmed in the "Order Information" table and "Absolute Maximum Ratings" section of the datasheet. It is distinct from the industrial-grade LTC2495IUHF#PBF (–40°C to 85°C) and should be selected only for ambient-controlled environments.
Does the LTC2495CUHF#PBF support true differential input measurements?
Yes, the LTC2495CUHF#PBF supports eight true differential input pairs (e.g., CH0/CH1, CH2/CH3, ..., CH14/CH15) with independent programmable gain per channel. Each differential pair accepts inputs from GND–0.3V to VCC+0.3V, and the device maintains 2 ppm INL and 600 nV RMS noise in differential mode - verified in Electrical Characteristics tables under "Integral Nonlinearity" and "Output Noise" conditions.
How does the Easy Drive technology in the LTC2495CUHF#PBF improve sensor interface design?
Easy Drive eliminates dynamic differential input current by automatically canceling input bias currents at sampling time. This allows the LTC2495CUHF#PBF to interface directly with high-impedance sensors (e.g., pH electrodes, thermocouples, unbuffered bridges) without external op-amps or RC filtering - preserving DC accuracy and reducing board area, cost, and calibration overhead.
Can the LTC2495CUHF#PBF perform simultaneous 50 Hz and 60 Hz line-frequency rejection in a single conversion?
Yes, the LTC2495CUHF#PBF includes a dedicated "Simultaneous 50Hz/60Hz Rejection Mode" activated via configuration register. In this mode, the digital filter places nulls at both 50 Hz and 60 Hz in one conversion cycle (tCONV ≈ 144–149 ms), enabling reliable operation in globally deployed equipment without firmware switching or external notch filters.
What is the function of the fO pin on the LTC2495CUHF#PBF?
The fO pin controls the conversion clock source: tying fO to GND selects the internal 307.2 kHz oscillator for standard operation; driving fO with an external clock (10–1000 kHz) overrides the internal oscillator to adjust output data rate and tune digital filter notches - enabling custom rejection frequencies beyond 50/60 Hz, as documented in the "External Oscillator Frequency Range" specification.
LTC2495CUHF#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:
- 16
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 8, 16
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- 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:
- PGA, Selectable Address, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2495CUHF#PBF FAQ
1.How can I place an order for LTC2495CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2495CUHF#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 LTC2495CUHF#PBF reliable?
The price and inventory of LTC2495CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2495CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2495CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2495CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2495CUHF#PBF?
LTC2495CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2495CUHF#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 LTC2495CUHF#PBF?
For technical support, including LTC2495CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2495CUHF#PBF requirements.
6.How does Aetrix verify that LTC2495CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2495CUHF#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 LTC2495CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2495CUHF#PBF?
All LTC2495CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2495CUHF#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 LTC2495CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2495CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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