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Analog Devices Inc. LTC2461CDD#PBF
- Part No.:
- LTC2461CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2461CDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,997
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Product details
Overview
LTC2461CDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit single-ended delta-sigma ADC with integrated 1.25V precision reference, I²C interface, and ultra-low 200nA sleep current. It operates from 2.7V to 5.5V, delivers 60 conversions per second, and features ±2 LSB offset error and ±0.01% gain error - ideal for battery-powered environmental sensors and embedded system monitoring.
For engineers reviewing the LTC2461CDD#PBF datasheet, LTC2461CDD#PBF pinout, LTC2461CDD#PBF application, or LTC2461CDD#PBF equivalent, key selection criteria include its 12-lead 3mm × 3mm DFN package, guaranteed no-missing-codes performance, internal oscillator eliminating external timing components, and 2ppm/°C reference drift over 0°C to 70°C.
Technical Context
The LTC2461CDD#PBF implements a proprietary delta-sigma architecture with continuous internal offset and full-scale calibration, ensuring accuracy across temperature without user intervention. Its input sampling scheme draws only 50nA average input current, enabling direct RC filter interfacing with <1 LSB error using 1kΩ/0.1µF networks.
It uses an internal oscillator and supports two I²C slave addresses (0010100b or 1010100b via A0 pin), plus a global address (1110111b) for synchronized multi-device conversion starts. Conversion time is fixed at 16.6ms (typ), with no latency between completion and data availability on SDA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonicity and full dynamic range utilization in precision measurement. |
| Reference Voltage | 1.25V ±3mV (1.247V–1.253V) with ±2ppm/°C max drift - enables stable 0V–1.25V input scaling without external reference. |
| Conversion Rate | 60 conversions/second - supports real-time monitoring of slow-varying signals like temperature or pressure. |
| Supply Current | 1.5mA during conversion, 800µA in nap mode, 200nA in sleep mode - extends battery life in always-on sensor nodes. |
| Input Type | Single-ended (IN to GND) - simplifies signal conditioning for unipolar sensors such as RTDs or voltage outputs. |
| I²C Interface | Standard/Fast-mode (up to 400kHz), 2-wire, open-drain SDA/SCL - compatible with most microcontrollers without level-shifting. |
| Operating Temp | 0°C to 70°C - qualified for commercial and industrial control environments where ambient stability is assured. |
Pinout & Package
Package: 12-lead 3mm × 3mm plastic DFN (DD) with exposed pad (Pin 13 = GND). Compact footprint suits space-constrained PCBs in portable instrumentation and IoT edge nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V reference source; requires 0.1µF bypass to GND for noise suppression and stability. |
| COMP (2) | Reference compensation | Connects to same 0.1µF capacitor as REFOUT to stabilize internal reference loop dynamics. |
| A0 (3) | I²C address select | Configures slave address: GND → 0010100b, VCC → 1010100b - enables dual-device addressing on same bus. |
| GND (4,7,11,13) | Ground terminals | Multiple low-impedance GND connections reduce ground bounce and improve PSRR in mixed-signal layouts. |
| SCL (5) | I²C clock input | Slave-only clock input; accepts up to 400kHz; rising edge clocks data into device, falling edge clocks data out. |
| SDA (6) | I²C bidirectional data | Open-drain output requiring external pull-up; transmits 16-bit result MSB-first after ACK. |
| REF– (8) | Reference negative input | Tied directly to system ground or sensor return - defines zero-scale point for ADC transfer function. |
| IN (9) | Analog input (single-ended) | Accepts 0V to 1.25V input; clamped at 0 (underrange) or 65535 (overrange); 0.35pF sampling capacitance minimizes loading. |
| GND (10) | Input ground reference | Dedicated GND pin for analog input path - isolates digital switching noise from sensitive input node. |
| VCC (12) | Power supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF bypassing to suppress supply ripple and ensure reference integrity. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency data output | 16-bit result available immediately after conversion completes - eliminates filter settling delay in multiplexed sensor systems. |
| Continuous background calibration | Automatic offset and full-scale correction every cycle - maintains accuracy over time and temperature without firmware overhead. |
| Ultra-low input sampling current | 50nA average - allows direct connection of RC anti-alias filters (e.g., 1kΩ/0.1µF) with negligible error contribution. |
| Integrated oscillator | No external crystal or RC network required - reduces BOM count and layout complexity in cost-sensitive designs. |
| Two power-down modes | Nap (800µA) and Sleep (200nA) - enables adaptive power management based on measurement duty cycle. |
Applications
| Environmental Monitoring | System Health Monitoring |
|---|---|
Use Scenario: Measuring temperature, humidity, or air quality in smart building nodes with multi-year battery life. IC Role / Device Role / Timing Role: Single-ended ADC digitizing analog outputs from thermistors or capacitive humidity sensors. Use Value: 200nA sleep current and internal reference eliminate external components, reducing solution size and power budget by >40% vs discrete reference + ADC designs. | Use Scenario: Real-time voltage, current, and temperature supervision in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision front-end converter for rail monitoring and fault detection circuits. Use Value: ±2 LSB offset error and ±0.01% gain error ensure reliable threshold detection across 0°C–70°C without recalibration. |
| Direct Temperature Measurements | Embedded ADC Upgrades |
Use Scenario: Cold-junction compensation in thermocouple interfaces using RTD or diode-based sensors. IC Role / Device Role / Timing Role: High-accuracy, low-drift analog front-end converting sensor voltage to digital for cold-junction calculation. Use Value: 2ppm/°C reference drift ensures <±0.1°C error contribution over full operating range - critical for Class I thermocouple accuracy. | Use Scenario: Replacing legacy 12-bit ADCs in existing microcontroller-based designs to improve resolution without changing firmware logic. IC Role / Device Role / Timing Role: Drop-in I²C-compatible upgrade delivering 16-bit resolution and built-in calibration. Use Value: Pin-compatible with LTC2461CMS#PBF (MSOP-12) and software-compatible with existing I²C drivers - enables hardware revision with minimal validation effort. |
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), 128SPS max, 4.096V reference option | Supports multi-sensor inputs and variable signal ranges; lacks integrated 1.25V reference with 2ppm/°C drift | Select when multi-channel acquisition or PGA flexibility is required; accept higher reference drift (±15ppm/°C) and larger 10-lead VSSOP package. |
| LTC2463CDD#PBF | Differential input (±1.25V range), identical pinout, same reference specs and power modes | Used for bridge sensors, current shunts, or bipolar signal conditioning where common-mode rejection is essential | Choose for differential measurements; shares same PCB layout and firmware I²C interface - only IN+/IN– routing differs. |
Compared with ADS1115IDGSR, LTC2461CDD#PBF offers superior reference stability and lower sleep current but lacks PGA and multi-channel capability; compared with LTC2463CDD#PBF, it provides simpler single-ended interfacing at identical size and power, making it optimal for unipolar sensor systems.
Availability
LTC2461CDD#PBF is available at Aetrix Electronics and suitable for environmental monitoring, system health monitoring, and embedded ADC upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2461CDD#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2461CDD#PBF belongs to ADI's ultra-low-power precision ADC product line, designed specifically for space- and energy-constrained applications demanding high resolution, integrated references, and simplified I²C-based system integration.
FAQ
What is the maximum sampling rate of the LTC2461CDD#PBF?
The LTC2461CDD#PBF performs 60 conversions per second, with a nominal conversion time of 16.6ms. This fixed-rate operation is enabled by its internal oscillator and supports deterministic timing for synchronized sensor polling without external clock dependencies.
Does the LTC2461CDD#PBF require external components for basic operation?
No - the LTC2461CDD#PBF integrates a precision 1.25V reference, oscillator, and input sampling circuitry. Only three external capacitors are required: 0.1µF on REFOUT, 0.1µF on COMP, and 10µF + 0.1µF on VCC. No external crystal, reference, or timing resistors are needed.
How does the LTC2461CDD#PBF handle overrange and underrange input conditions?
The LTC2461CDD#PBF clamps output codes at 0 for inputs below 0V (underrange) and at 65535 for inputs above 1.25V (overrange). This behavior is defined in the datasheet and ensures predictable digital output even under transient or fault conditions.
Can the LTC2461CDD#PBF be used with a 3.3V microcontroller I²C bus?
Yes - the LTC2461CDD#PBF supports I²C standard/fast-mode up to 400kHz and has VIH(MIN) = 0.7×VCC and VIL(MAX) = 0.3×VCC. With VCC = 3.3V, it interfaces directly with 3.3V logic; SDA requires only a 1.7kΩ pull-up to VCC, and no level translation is necessary.
What is the purpose of the A0 pin on the LTC2461CDD#PBF?
The A0 pin selects one of two I²C slave addresses: tied to GND yields 0010100b (0x24), tied to VCC yields 1010100b (0x54). This allows two LTC2461CDD#PBF devices to share the same I²C bus without address conflict, supporting dual-sensor configurations in compact systems.
LTC2461CDD#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2461CDD#PBF FAQ
1.How can I place an order for LTC2461CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2461CDD#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 LTC2461CDD#PBF reliable?
The price and inventory of LTC2461CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2461CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2461CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2461CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2461CDD#PBF?
LTC2461CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2461CDD#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 LTC2461CDD#PBF?
For technical support, including LTC2461CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2461CDD#PBF requirements.
6.How does Aetrix verify that LTC2461CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2461CDD#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 LTC2461CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2461CDD#PBF?
All LTC2461CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2461CDD#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 LTC2461CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2461CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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