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Analog Devices Inc. LTC2451IDDB#TRPBF
- Part No.:
- LTC2451IDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2451IDDB#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,899
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Product details
Overview
LTC2451IDDB#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma analog-to-digital converter with I²C interface, single-ended input range from VREF– to VREF+, 30/60 Hz programmable conversion rate, and ultra-low 50 nA average input sampling current. It operates from a single 2.7V to 5.5V supply and targets precision sensor interfacing in space-constrained industrial monitoring systems.
For engineers reviewing the LTC2451IDDB#TRPBF datasheet, LTC2451IDDB#TRPBF pinout, LTC2451IDDB#TRPBF application, or LTC2451IDDB#TRPBF equivalent, key selection considerations include its 0.02 LSB RMS noise, 2 LSB INL, single-cycle settling for multiplexed inputs, internal oscillator eliminating external timing components, and DFN-8 (3 mm × 2 mm) package with exposed ground pad.
Technical Context
The LTC2451IDDB#TRPBF employs a proprietary delta-sigma modulator core with integrated oscillator and continuous internal offset calibration in 30 Hz mode. Its input sampling architecture reduces average input current to 50 nA, enabling direct RC filtering without significant error.
It uses a fixed 7-bit I²C slave address (0010100), supports standard/fast-mode I²C up to 400 kHz, and delivers 16-bit output data with no latency-MSB-first on falling SCL edges. Conversion completes in 13–46 ms depending on mode, and the device automatically enters sleep (<0.2 µA) after data read.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage across full scale. |
| INL | 2 LSB max-ensures linearity error remains below ±0.003% of full scale for high-accuracy measurements. |
| RMS Noise | 0.02 LSB-translates to ~1.4 µVRMS at 5 V reference, supporting sub-millivolt signal resolution. |
| Conversion Rate | Programmable 30 or 60 conversions/sec-enables trade-off between speed and noise performance. |
| Supply Current | 400 µA active / 0.2 µA sleep-enables battery-powered operation with <50 µW average power at 1 Hz read rate. |
| Input Range | GND to VCC single-ended-simplifies system design when REF+ = VCC and REF– = GND. |
| I²C Interface | 2-wire, 400 kHz max clock-compatible with standard microcontroller peripherals without custom timing logic. |
Pinout & Package
The LTC2451IDDB#TRPBF is housed in an 8-lead, 3 mm × 2 mm plastic DFN package (DDB) with exposed ground pad (Pin 9), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 5, 9) | Ground reference and thermal pad | Pins 1 and 5 are signal grounds; Pin 9 is exposed pad-must be soldered to PCB ground plane for thermal and electrical integrity. |
| REF– (Pin 2) | Negative reference input | Differential reference terminal; sets lower bound of input range (VREF– ≤ VIN ≤ VREF+). |
| REF+ (Pin 3) | Positive reference input | Differential reference terminal; requires VREF+ – VREF– ≥ 2.5 V for valid operation. |
| VCC (Pin 4) | Positive supply | 2.7 V to 5.5 V single supply; requires local 10 µF || 0.1 µF decoupling to GND. |
| IN (Pin 6) | Analog input | Single-ended input node with 0.35 pF sampling capacitance and 50 nA average input current. |
| SCL (Pin 7) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; no internal clock generation on this pin. |
| SDA (Pin 8) | I²C bidirectional data | Open-drain output during data transfer; requires external 1.7 kΩ pull-up to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary input sampling | Reduces average input current to 50 nA-enables direct connection of RC filters (e.g., 1 kΩ + 0.1 µF) with <1 LSB added error. |
| Single-cycle settling | Delivers valid conversion result after one complete cycle-eliminates multiplexing delay and simplifies firmware timing. |
| Internal oscillator | No external crystal or RC network required-reduces BOM count and board area in compact designs. |
| Auto sleep mode | Enters <0.2 µA sleep after data read-lowers average power to <50 µW at 1 Hz read rate from 2.7 V supply. |
| Continuous offset calibration | Active in 30 Hz mode only-maintains accuracy over temperature and time without user intervention or interrupt overhead. |
Applications
| System Monitoring | Environmental Monitoring |
|---|---|
Use Scenario: Real-time voltage, current, and temperature tracking in industrial PLC I/O modules and power supply supervisors. IC Role / Device Role / Timing Role: Precision ADC capturing analog sensor outputs with minimal microcontroller interaction via I²C. Use Value: 2 LSB INL and 0.02 LSB RMS noise enable detection of <1 mV drift in 5 V rails, supporting predictive maintenance alerts. | Use Scenario: Battery-powered air quality sensors measuring CO₂, humidity, and ambient temperature in smart buildings. IC Role / Device Role / Timing Role: Low-power analog front-end digitizing resistive or capacitive sensor outputs at 30 Hz for energy-efficient sampling. Use Value: 0.2 µA sleep current and auto-shutdown extend coin-cell life beyond 5 years while maintaining measurement fidelity. |
| Direct Temperature Measurements | Instrumentation |
Use Scenario: Thermistor or RTD-based temperature sensing in medical devices and lab equipment requiring ±0.1°C accuracy. IC Role / Device Role / Timing Role: High-resolution ADC with differential reference support for ratiometric measurements against stable voltage references. Use Value: Programmable 30/60 Hz conversion and internal offset calibration ensure stability across –40°C to +85°C operating range. | Use Scenario: Portable multimeters and handheld data loggers digitizing DC signals up to ±5 V full scale. IC Role / Device Role / Timing Role: Standalone 16-bit converter interfaced directly to MCU I²C bus-no external timing or control logic needed. Use Value: Single 2.7–5.5 V supply, GND-to-VCC input range, and no missing codes simplify calibration and reduce firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel input, programmable gain amplifier (PGA), 860 µA active current, no internal oscillator-requires external clock or MCU timing. | Supports differential and PGA-configured inputs; better suited for multi-sensor systems with varying signal amplitudes. | Choose ADS1115IDGSR when channel count or programmable gain is required; LTC2451IDDB#TRPBF offers lower power and simpler layout for single-input, fixed-range use cases. |
| MCP3424-E/ST | 4-channel, 18-bit resolution, 2.7–5.5 V supply, 150 µA active current, no auto sleep-requires explicit power-down command. | Higher resolution but slower max rate (15 sps at 18-bit); lacks automatic low-power transition and single-cycle settling. | Choose MCP3424-E/ST when 18-bit resolution outweighs power and latency constraints; LTC2451IDDB#TRPBF delivers superior speed/power trade-off at 16-bit. |
Compared with ADS1115IDGSR and MCP3424-E/ST, the LTC2451IDDB#TRPBF provides the lowest active-to-sleep current ratio (2000:1), smallest footprint (3 mm × 2 mm), and simplest integration-requiring no external timing components or configuration registers for basic operation.
Availability
LTC2451IDDB#TRPBF is available at Aetrix Electronics and suitable for system monitoring, environmental sensing, and instrumentation applications requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term production continuity.
Supply support for LTC2451IDDB#TRPBF 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 LTC2451IDDB#TRPBF belongs to ADI's ultra-low-power precision ADC product line, designed specifically for space-constrained, battery-operated, and high-accuracy sensor interface applications where simplicity, low quiescent current, and guaranteed monotonicity are critical.
FAQ
What is the operating temperature range of the LTC2451IDDB#TRPBF?
The LTC2451IDDB#TRPBF is specified for operation from –40°C to +85°C (Industrial grade). This range is validated across all key parameters including INL, offset error, and conversion time, making it suitable for deployment in harsh industrial environments where thermal stability is essential. The device maintains 2 LSB INL and 0.02 LSB RMS noise across this full range in 30 Hz mode.
Does the LTC2451IDDB#TRPBF require external components for timing or reference?
No, the LTC2451IDDB#TRPBF integrates an internal oscillator and requires no external timing components. For reference, it supports fully differential external references (REF+ and REF–), but can operate with VREF+ = VCC and VREF– = GND-eliminating need for dedicated reference ICs in many applications. Only decoupling capacitors (0.1 µF and 10 µF) are mandatory at VCC and REF pins.
How does the LTC2451IDDB#TRPBF achieve single-cycle settling time?
The LTC2451IDDB#TRPBF achieves true single-cycle settling through its proprietary delta-sigma architecture and input sampling scheme. Unlike conventional delta-sigma converters that require multiple cycles to settle after input changes, the LTC2451IDDB#TRPBF delivers a fully settled 16-bit result after exactly one conversion period-enabling reliable multiplexed sampling without guard-band delays or firmware wait states.
What I²C address does the LTC2451IDDB#TRPBF use, and is it configurable?
The LTC2451IDDB#TRPBF uses a fixed 7-bit I²C slave address of 0010100 (0x24). This address is factory-programmed and not configurable. The device responds only to this address and supports standard/fast-mode I²C up to 400 kHz. It acts exclusively as a slave and does not support multi-master arbitration or address remapping.
Can the LTC2451IDDB#TRPBF operate with a 3.3 V supply and measure signals from 0 V to 3.3 V?
Yes, the LTC2451IDDB#TRPBF supports 2.7 V to 5.5 V supply operation and accepts a GND-to-VCC single-ended input range when REF+ = VCC and REF– = GND. At VCC = 3.3 V, the input range is 0 V to 3.3 V, with full-scale resolution of 3.3 V / 65536 ≈ 50.4 µV per LSB. All specifications-including 2 LSB INL and 0.02 LSB RMS noise-are guaranteed across this condition.
LTC2451IDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-DFN (3x2)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2451IDDB#TRPBF FAQ
1.How can I place an order for LTC2451IDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2451IDDB#TRPBF 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 LTC2451IDDB#TRPBF reliable?
The price and inventory of LTC2451IDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2451IDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2451IDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2451IDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2451IDDB#TRPBF?
LTC2451IDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2451IDDB#TRPBF 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 LTC2451IDDB#TRPBF?
For technical support, including LTC2451IDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2451IDDB#TRPBF requirements.
6.How does Aetrix verify that LTC2451IDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2451IDDB#TRPBF 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 LTC2451IDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2451IDDB#TRPBF?
All LTC2451IDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2451IDDB#TRPBF, 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 LTC2451IDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2451IDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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