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Analog Devices Inc. LTC2461IDD#PBF
- Part No.:
- LTC2461IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2461IDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,486
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Product details
Overview
LTC2461IDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma ADC with integrated 1.25V precision reference, single-ended input (0V to 1.25V), I²C interface, and ultra-low 200nA sleep current. It operates from 2.7V to 5.5V, delivers 60 conversions per second, and targets high-accuracy sensor digitization in space-constrained industrial monitoring systems.
For engineers reviewing the LTC2461IDD#PBF datasheet, LTC2461IDD#PBF pinout, LTC2461IDD#PBF application, or LTC2461IDD#PBF equivalent, key selection criteria include guaranteed no-missing-codes resolution, ±2 LSB typical offset error, 10 ppm/°C max reference drift over –40°C to +85°C, and DFN-12 (3mm × 3mm) package compatibility with multiplexed low-power sensing nodes.
Technical Context
The LTC2461IDD#PBF implements a proprietary delta-sigma architecture with continuous internal offset and full-scale calibration, eliminating user intervention while maintaining accuracy across temperature. Its integrated oscillator enables self-timed conversion without external timing components.
It supports two I²C slave addresses (0x24 or 0x54) via A0 pin configuration, uses open-drain SDA with external pull-up, and transitions automatically between CONVERT (16.6 ms), NAP (ADC off, reference on), and SLEEP (ADC + reference off) states-enabling deterministic power management for battery-operated systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonicity and full dynamic range utilization |
| Reference Voltage | 1.25 V ±3 mV (–40°C to +85°C) - sets absolute input full-scale at 0V–1.25V for single-ended mode |
| Conversion Rate | 60 sps - supports real-time sampling of slow-varying physical signals (e.g., temperature, pressure) |
| Supply Current | 1.5 mA active, 200 nA sleep - enables >10-year battery life in wake-on-event sensor nodes |
| Offset Error | ±2 LSB typical - contributes ≤0.003% FS error at 1.25V range, critical for zero-point stability |
| Gain Error | ±0.01% FS typical - ensures end-to-end linearity without system-level gain trimming |
| Reference Drift | ±5 ppm/°C max (I-grade) - limits reference-induced error to <±62.5 µV over full temp range |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V reference source; must be decoupled with ≤0.1µF capacitor to GND; cannot be overdriven |
| COMP (2) | Reference compensation | Connects to same 0.1µF capacitor as REFOUT to stabilize internal reference loop |
| A0 (3) | I²C address select | Logic level sets slave address: GND → 0x24, VCC → 0x54; enables dual-device bus sharing |
| GND (4,7,11,13) | Ground return | Multiple low-impedance ground connections required; exposed pad (13) must be soldered to PCB ground plane |
| SCL (5) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; rising edge latches data into device |
| SDA (6) | I²C bidirectional data | Open-drain output requiring external pull-up; transmits 16-bit result MSB-first on falling SCL edges |
| REF– (8) | Reference negative input | Connected to system ground or sensor ground sense point; defines ADC zero-input reference |
| IN (9) | Single-ended analog input | Accepts 0V to 1.25V input relative to REF–; clamps at 0 (underrange) or 65535 (overrange) |
| GND (10) | Input ground reference | Dedicated ground tie for IN pin; isolates analog input path from digital noise |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF bypassing directly at pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25V reference | 2 ppm/°C typical drift and 0.1% initial accuracy eliminate need for external precision reference |
| Proprietary input sampling | 50 nA average input current enables direct RC filtering (e.g., 1kΩ + 0.1µF) with <1 LSB error |
| Automatic calibration | Continuous offset and full-scale correction per conversion ensures long-term accuracy without host intervention |
| Zero-latency data output | One-to-one correspondence between conversion completion and 16-bit output eliminates FIFO or buffer management |
| Configurable sleep mode | SLP bit powers down reference independently, reducing total sleep current to 200 nA for extended quiescent periods |
Applications
| Environmental Monitoring | Industrial Sensor Nodes |
|---|---|
Use Scenario: Measuring temperature, humidity, or gas concentration in unattended field deployments. IC Role / Device Role / Timing Role: Single-ended ADC digitizing conditioned sensor outputs (e.g., RTD bridge, thermistor voltage) with stable 1.25V reference. Use Value: 200nA sleep current extends battery life beyond 10 years; no-missing-codes resolution ensures detection of subtle environmental shifts. | Use Scenario: Retrofitting legacy analog sensors with digital I²C output in PLC I/O modules or predictive maintenance gateways. IC Role / Device Role / Timing Role: High-accuracy front-end ADC replacing discrete op-amp + external reference + SAR converter solutions. Use Value: Integrated reference and calibration reduce BOM count by 3–4 components; DFN-12 footprint saves >50% PCB area vs. MSOP alternatives. |
| Direct Temperature Measurements | Embedded ADC Upgrades |
Use Scenario: Cold-junction compensation in thermocouple interfaces or direct thermistor readout in medical devices. IC Role / Device Role / Timing Role: Precision single-ended ADC referenced to its own 1.25V output, rejecting supply ripple via 80 dB PSRR. Use Value: ±2 LSB offset error and ±0.01% gain error enable <0.1°C measurement repeatability without factory calibration. | Use Scenario: Replacing aging 12-bit ADCs in existing designs to improve resolution without layout changes. IC Role / Device Role / Timing Role: Pin-compatible upgrade path (DFN-12) offering 4× resolution increase and integrated reference. Use Value: Same footprint and I²C protocol simplify firmware migration; 16-bit output improves dynamic range by 24 dB for low-amplitude signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel differential input, programmable gain amplifier (PGA), 860 µA active current, no integrated reference | Requires external 2.048V reference; better suited for multi-sensor, variable-range systems | Select when channel count or PGA flexibility outweighs lowest sleep current and reference integration |
| MCP3424-E/ST | 4-channel, 18-bit resolution, 2.7V–5.5V supply, 150 nA sleep current, but 15 ppm/°C reference drift (max) | Higher resolution but looser reference stability; lacks automatic calibration | Select when ultimate resolution is prioritized over guaranteed monotonicity and long-term drift performance |
Compared with ADS1115IDGSR and MCP3424-E/ST, the LTC2461IDD#PBF uniquely combines guaranteed no-missing-codes 16-bit resolution, integrated 1.25V reference with ±5 ppm/°C max drift, and 200nA sleep current in a 3mm × 3mm DFN-making it optimal for ultra-low-power, single-channel precision sensing where reference stability and minimal BOM are critical.
Availability
LTC2461IDD#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, environmental monitoring systems, and embedded ADC upgrades requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2461IDD#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 LTC2461IDD#PBF belongs to ADI's ultra-low-power precision delta-sigma ADC product line, designed specifically for space-constrained, battery-powered sensing applications demanding high DC accuracy and minimal quiescent current.
FAQ
What is the operating temperature range of the LTC2461IDD#PBF?
The LTC2461IDD#PBF is rated for –40°C to +85°C (I-grade), validated across this full range for all key specifications including reference voltage (1.25 V ±3 mV), offset error (±5 LSB max), and supply current (1.5 mA max active). This makes the LTC2461IDD#PBF suitable for deployment in harsh industrial environments without derating.
Does the LTC2461IDD#PBF require an external crystal or clock source?
No, the LTC2461IDD#PBF includes a fully integrated oscillator and requires no external timing components. Its internal clock drives the delta-sigma modulator and I²C interface timing, enabling true "single-component" ADC implementation with only passive decoupling capacitors needed on REFOUT, COMP, and VCC pins.
How does the LTC2461IDD#PBF handle input overrange and underrange conditions?
The LTC2461IDD#PBF clamps output codes at digital extremes: input voltages below 0 V produce code 0 (all zeros), and inputs above 1.25 V produce code 65535 (all ones). This behavior is deterministic and documented in the output data format table, ensuring predictable saturation handling in closed-loop control or alarm-triggered systems using the LTC2461IDD#PBF.
Can the LTC2461IDD#PBF operate from a 3.3V supply?
Yes, the LTC2461IDD#PBF operates across 2.7V to 5.5V, including standard 3.3V rails. At 3.3V, its supply current remains within spec (1.5 mA typical active, 200 nA sleep), and reference output holds 1.25 V ±3 mV. The I²C interface maintains full compatibility with 3.3V logic levels, as VIH and VIL thresholds scale with VCC per datasheet specs.
What is the purpose of the COMP pin on the LTC2461IDD#PBF?
COMP (Pin 2) is the internal reference compensation node. It must be connected to the same 0.1 µF capacitor as REFOUT (Pin 1) to stabilize the reference feedback loop. Using mismatched or oversized capacitors risks reference instability or increased noise-so the LTC2461IDD#PBF's COMP pin enforces a precise, low-noise reference design without external op-amps or compensation networks.
LTC2461IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 60
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- I2C
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2461IDD#PBF FAQ
1.How can I place an order for LTC2461IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2461IDD#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 LTC2461IDD#PBF reliable?
The price and inventory of LTC2461IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2461IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2461IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2461IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2461IDD#PBF?
LTC2461IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2461IDD#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 LTC2461IDD#PBF?
For technical support, including LTC2461IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2461IDD#PBF requirements.
6.How does Aetrix verify that LTC2461IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2461IDD#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 LTC2461IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2461IDD#PBF?
All LTC2461IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2461IDD#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 LTC2461IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2461IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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