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Analog Devices Inc. LTC2495IUHF#PBF
- Part No.:
- LTC2495IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2495IUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,913
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Product details
Overview
LTC2495IUHF#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 high-accuracy direct digitization of rail-to-rail, high-impedance sensor signals in industrial data acquisition systems.
For engineers reviewing the LTC2495IUHF#PBF datasheet, LTC2495IUHF#PBF pinout, LTC2495IUHF#PBF application, or LTC2495IUHF#PBF equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios for temperature-compensated measurement, and confirmed alternative options for multi-channel precision ADC selection.
Technical Context
The LTC2495IUHF#PBF employs a 3rd-order delta-sigma modulator with decimating FIR filtering and automatic per-conversion offset/full-scale calibration. Its Easy Drive architecture eliminates differential input current errors via dynamic cancellation, enabling accurate measurements from sources up to 10 MΩ without external buffering.
It supports simultaneous 50 Hz/60 Hz rejection, configurable 1× or 2× speed modes (7.5 Hz / 15 Hz output rate), and operates from 2.7 V to 5.5 V with 160 µA typical supply current in normal mode. The integrated temperature sensor provides 0.5 °C resolution and ±2 °C absolute accuracy over –40 °C to +85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF - ensures linearity error ≤ ±0.0002% of full scale, critical for calibrated sensor systems. |
| Offset Error | ±0.5 µV (typical) - enables sub-microvolt DC measurement stability without manual nulling. |
| RMS Noise | 600 nV (1× speed, GAIN=256) - supports 19.5 ENOB at low data rates for ultra-low-noise applications. |
| Input Common Mode Range | GND to VCC - allows direct digitization of rail-to-rail single-ended or differential signals independent of reference voltage. |
| Programmable Gain | 1 to 256 in 8 discrete steps - matches full-scale range to sensor output amplitude without external amplification. |
| Temperature Sensor Accuracy | ±2 °C absolute, 0.5 °C resolution - enables on-chip thermal compensation without external thermistors. |
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 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 common low-impedance ground plane. |
| SCL (Pin 2) | I²C clock input | Slave-only interface; accepts external 0–400 kHz clock; rising edge latches SDA input, falling edge outputs data. |
| SDA (Pin 3) | I²C bidirectional data | Open-drain output during read; high-impedance input during write; requires external pull-up to VCC. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; supports rail-to-rail common-mode voltage (GND–0.3 V to VCC+0.3 V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; each pair selected via I²C register writes. |
| MUXOUTP/N (Pins 24, 27) | Multiplexer outputs | Access to internal mux output enables shared external instrumentation amplifier across all channels. |
| ADCINP/N (Pins 25, 26) | ADC analog inputs | Differential inputs to sigma-delta modulator; may be driven directly by MUXOUT or external signal conditioning. |
| VCC (Pin 28) | Supply voltage | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypass close to pin. |
| REF+/REF– (Pins 29, 30) | Differential reference | Reference voltage range: 0.1 V to VCC; sets full-scale range as ±0.5·VREF/Gain. |
| fO (Pin 35) | Frequency control | GND = internal 307.2 kHz oscillator; external clock overrides for custom data rate or 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 Delta-Sigma Architecture | First conversion after channel change is fully settled and meets spec - eliminates filter delay uncertainty in multiplexed systems. |
| Easy Drive Input Technology | Zero net differential input current - enables direct connection to high-impedance sensors (e.g., RTDs, thermocouples) without buffer-induced errors. |
| Integrated Temperature Sensor | On-die PTAT circuit with 93.5 µV/°C coefficient - provides real-time die temperature for system-level drift compensation. |
| Simultaneous 50 Hz/60 Hz Rejection | Single-cycle digital filter notch at both line frequencies - eliminates need for external notch filters in AC-coupled industrial environments. |
| Auto-Calibration per Conversion | Continuous offset and full-scale correction - maintains accuracy over time and temperature without user intervention or calibration cycles. |
| I²C Address Flexibility | 27 unique addresses + global sync - supports daisy-chained multi-ADC configurations with synchronized sampling across boards. |
Applications
| Industrial Process Monitoring | Multi-Sensor Data Logger |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in PLC-based control cabinets with ambient temperature swings. IC Role / Device Role / Timing Role: Precision front-end ADC digitizing 4–20 mA loop outputs and mV-level bridge sensors via programmable gain and rail-to-rail inputs. Use Value: Eliminates external op-amps and reference buffers while maintaining <2 ppm INL across –40 °C to +85 °C operating range. |
Use Scenario: Battery-powered environmental logger capturing temperature, humidity, and gas concentration from multiple analog sensors over weeks. IC Role / Device Role / Timing Role: Low-power 16-channel ADC with sleep mode (1 µA) and integrated temperature sensor for on-board thermal compensation. Use Value: Reduces BOM count by integrating PGA, reference, oscillator, and temp sensor - cutting board space and power vs. discrete solutions. |
| High-Accuracy Weigh Scale Interface | Medical Instrumentation Front-End |
Use Scenario: Strain-gauge-based weighing platform requiring <0.001% linearity and immunity to 50/60 Hz mains interference. IC Role / Device Role / Timing Role: Delta-sigma ADC with simultaneous line-frequency rejection and 600 nV RMS noise for 24-bit effective resolution. Use Value: Achieves NTEP Class III compliance without external notch filters or complex digital post-processing. |
Use Scenario: Portable patient monitor measuring ECG, respiration, and skin temperature with minimal size and power budget. IC Role / Device Role / Timing Role: Single-chip analog front-end handling differential biopotential inputs, reference generation, and on-chip thermal reference. Use Value: Enables medical-grade accuracy (±2 °C temp, 2 ppm INL) in compact form factor with I²C simplifying host MCU integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBS | 24-bit resolution, SPI interface, 4-channel (2 diff), no integrated temp sensor, higher power (350 µA) | Requires external reference and PGA; better for ultra-high-resolution single-point measurement, not multi-sensor thermal compensation | Select when 24-bit resolution outweighs I²C simplicity and on-chip temperature sensing. |
| MAX11206ETN+ | 24-bit resolution, SPI interface, 8-channel (4 diff), no Easy Drive, 1.2 µV offset (vs. 0.5 µV), no integrated temp sensor | Lacks rail-to-rail input support and simultaneous 50/60 Hz rejection; suited for lab-grade bench instruments over field-deployed systems | Choose for highest raw resolution where external buffering and line filtering are acceptable. |
Compared with ADS124S08IPBS and MAX11206ETN+, the LTC2495IUHF#PBF uniquely combines I²C simplicity, zero-differential-input-current architecture, integrated temperature sensing, and simultaneous dual-line-frequency rejection - making it optimal for compact, thermally compensated, multi-sensor industrial nodes.
Availability
LTC2495IUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, battery-powered data loggers, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2495IUHF#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 LTC2495IUHF#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, multi-channel, high-accuracy sensor digitization in thermally demanding environments - emphasizing ease-of-use, integrated functionality, and robustness against EMI and supply noise.
FAQ
What is the operating temperature range of the LTC2495IUHF#PBF?
The LTC2495IUHF#PBF is rated for –40 °C to +85 °C (industrial grade), matching its "I" suffix designation. All key specifications - including 2 ppm INL, 0.5 µV offset, and ±2 °C temperature sensor accuracy - are guaranteed across this full range. The device uses internal auto-calibration to maintain performance without external trimming.
Does the LTC2495IUHF#PBF require external components for basic operation?
Yes - the LTC2495IUHF#PBF requires a 10 µF tantalum + 0.1 µF ceramic capacitor on VCC, pull-up resistors on SDA/SCL, and proper grounding of all seven GND pins and the exposed pad. No external reference, oscillator, or PGA is needed: the LTC2495IUHF#PBF integrates a precision reference path, internal 307.2 kHz oscillator, and programmable gain amplifier (1–256×).
How does the Easy Drive technology in the LTC2495IUHF#PBF improve measurement accuracy?
Easy Drive eliminates dynamic differential input current by automatically canceling input bias currents at the sampling node. This allows the LTC2495IUHF#PBF to accurately digitize signals from high-impedance sources (e.g., 10 MΩ pH electrodes or unbuffered thermocouples) without gain/offset errors caused by external series resistance - a limitation of conventional delta-sigma ADCs.
Can the LTC2495IUHF#PBF perform simultaneous 50 Hz and 60 Hz rejection in a single conversion cycle?
Yes - the LTC2495IUHF#PBF's digital filter is configurable for simultaneous 50 Hz/60 Hz rejection mode, achieving >87 dB normal-mode rejection at both frequencies in one conversion. This is implemented in hardware and requires no firmware overhead, making it ideal for global deployments where mains frequency varies by region.
What is the function of the MUXOUTP and MUXOUTN pins on the LTC2495IUHF#PBF?
MUXOUTP and MUXOUTN provide access to the internal analog multiplexer output before the ADC core. This allows a single external instrumentation amplifier to condition signals from all 16 channels - reducing component count, matching errors, and PCB area versus per-channel amplifiers. The LTC2495IUHF#PBF continues to apply auto-calibration to the amplified path.
LTC2495IUHF#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2495IUHF#PBF FAQ
1.How can I place an order for LTC2495IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2495IUHF#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 LTC2495IUHF#PBF reliable?
The price and inventory of LTC2495IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2495IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2495IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2495IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2495IUHF#PBF?
LTC2495IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2495IUHF#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 LTC2495IUHF#PBF?
For technical support, including LTC2495IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2495IUHF#PBF requirements.
6.How does Aetrix verify that LTC2495IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2495IUHF#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 LTC2495IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2495IUHF#PBF?
All LTC2495IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2495IUHF#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 LTC2495IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2495IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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