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Analog Devices Inc. LTC2451IDDB#TRMPBF
- Part No.:
- LTC2451IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2451IDDB#TRMPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
LTC2451IDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma analog-to-digital converter with single-ended input, I²C interface, and integrated oscillator. It operates from 2.7V to 5.5V, delivers ≤2 LSB INL and 0.02 LSB RMS noise, and supports programmable 30/60 conversions per second - ideal for low-power system monitoring and embedded sensor interfacing.
For engineers reviewing the LTC2451IDDB#TRMPBF datasheet, LTC2451IDDB#TRMPBF pinout, LTC2451IDDB#TRMPBF application, or LTC2451IDDB#TRMPBF equivalent, key selection considerations include its ultra-low 50 nA average input sampling current, single-cycle settling for multiplexed inputs, sleep current <0.2 µA, 3 mm × 2 mm DFN package, and built-in offset calibration in 30 Hz mode.
Technical Context
The LTC2451IDDB#TRMPBF employs a proprietary delta-sigma modulator core with internal oscillator and no external timing components required. Its input sampling architecture reduces average input current to 50 nA, enabling direct RC filtering without significant code error.
It uses a 2-wire I²C interface with fixed slave address 0010100 (0x24), supports standard/fast-mode up to 400 kHz, and provides 16-bit output with no latency or filter settling delay. Conversion results are held in a static shift register during sleep mode, and new conversions auto-initiate after STOP or full 16-bit read.
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 LSB max - ensures linearity error remains below 0.003% of full scale for precision measurement. |
| RMS Noise | 0.02 LSB - corresponds to ~1.4 µVRMS at 5 V reference, enabling sub-millivolt resolution. |
| Conversion Rate | Programmable 30 or 60 sps - selectable via I²C write; 30 Hz mode includes continuous internal offset calibration. |
| Supply Current | 400 µA active, <0.2 µA sleep - enables battery-powered operation with average power <50 µW at 1 sps from 2.7 V. |
| Input Range | GND to VCC (single-ended) - supports rail-to-rail input when REF+ = VCC, REF– = GND. |
| I²C Address | 0x24 (7-bit, hardwired) - eliminates address configuration overhead and simplifies multi-device bus design. |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN (DDB), exposed pad (Pin 9) connected to GND and required to be soldered to PCB ground plane.
| 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 thermal pad - must be soldered to PCB ground for thermal performance and EMI control. |
| REF– (Pin 2) | Negative reference input | Differential reference terminal; sets lower bound of input range (VIN ≥ VREF–); requires VREF+ – VREF– ≥ 2.5 V. |
| REF+ (Pin 3) | Positive reference input | Differential reference terminal; sets upper bound of input range (VIN ≤ VREF+); supports up to VCC. |
| VCC (Pin 4) | Positive supply | Single 2.7–5.5 V supply; requires local 10 µF + 0.1 µF ceramic decoupling to GND (Pins 1/5). |
| IN (Pin 6) | Analog input | Single-ended input node; accepts voltage between REF– and REF+; average sampling current = 50 nA. |
| 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 read; requires external 1.7 kΩ pull-up to VCC; high-impedance when not driving. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input sampling current | 50 nA average - allows use of simple RC filters (e.g., 1 kΩ + 0.1 µF) with <1 LSB added error. |
| Single-cycle settling time | One conversion per channel - eliminates settling delay in multiplexed sensor systems; no wait states needed. |
| Auto-sleep after conversion | <0.2 µA quiescent current - enables microamp-level system power budgeting between measurements. |
| Internal oscillator | No external crystal or RC network required - reduces BOM count and board area in space-constrained designs. |
| Continuous offset calibration | Active only in 30 Hz mode - maintains accuracy over temperature (±0.02 LSB/°C drift) without user intervention. |
Applications
| System Monitoring | Environmental Monitoring |
|---|---|
|
Use Scenario: Real-time voltage, current, and temperature tracking in industrial PLCs and power supplies. IC Role / Device Role / Timing Role: Precision ADC capturing slow-varying analog signals with minimal MCU intervention. Use Value: 16-bit resolution and <2 LSB INL enable detection of <1 mV changes at 5 V full scale, supporting predictive maintenance alerts. |
Use Scenario: Battery-powered air quality sensors measuring CO₂, humidity, and ambient temperature. IC Role / Device Role / Timing Role: Low-power analog front-end digitizing resistive/capacitive sensor outputs. Use Value: 50 nA input current and <0.2 µA sleep draw extend coin-cell life beyond 5 years at 1 sample/minute. |
| Direct Temperature Measurements | Embedded ADC Upgrades |
|
Use Scenario: Cold-junction compensation and thermocouple linearization in portable test equipment. IC Role / Device Role / Timing Role: High-accuracy ratiometric ADC referenced to stable LT6660 voltage reference. Use Value: 0.02 LSB RMS noise and internal offset calibration ensure ±0.1°C repeatability over –40°C to +85°C operating range. |
Use Scenario: Replacing legacy 12-bit ADCs in existing embedded designs without layout changes. IC Role / Device Role / Timing Role: Pin-compatible upgrade path offering 4× resolution improvement and I²C simplicity. Use Value: Same 3 mm × 2 mm DFN footprint and identical I²C protocol reduce firmware porting effort and qualification time. |
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 input, programmable gain amplifier (PGA), 860 µA active current, no internal oscillator - requires external clock or crystal. | Supports differential and PGA-configured inputs; better suited for multi-sensor arrays with varying signal amplitudes. | Choose ADS1115IDGSR when multi-channel acquisition or programmable gain is required; LTC2451IDDB#TRMPBF preferred for lowest power and smallest footprint. |
| MCP3421A0T-E/CH | 18-bit resolution, 15 ppm/°C gain drift, 250 µA active current, fixed 3.75 sps rate - no 30/60 sps option or internal calibration. | Higher resolution but slower update rate; lacks continuous offset correction - less stable over temperature without external calibration. | Choose MCP3421A0T-E/CH for ultra-high-resolution DC measurements where speed is secondary; LTC2451IDDB#TRMPBF offers superior speed/stability trade-off. |
Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the LTC2451IDDB#TRMPBF uniquely combines single-cycle settling, 50 nA input current, and auto-calibrating 30 Hz mode - making it optimal for compact, battery-sensitive, multiplexed sensor nodes requiring consistent accuracy across temperature without firmware overhead.
Availability
LTC2451IDDB#TRMPBF is available at Aetrix Electronics and suitable for system monitoring, environmental sensing, and embedded instrumentation requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for LTC2451IDDB#TRMPBF 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 acquired Linear Technology in 2017 and maintains its high-precision analog product lines with emphasis on signal chain integrity and low-power innovation.
The LTC2451IDDB#TRMPBF belongs to Linear's ultra-low-power delta-sigma ADC family, designed specifically for space- and energy-constrained applications such as portable instrumentation, IoT edge nodes, and industrial diagnostics.
FAQ
What is the operating temperature range of the LTC2451IDDB#TRMPBF?
The LTC2451IDDB#TRMPBF is rated for –40°C to +85°C (Industrial grade). This is confirmed by the "I" suffix in the part number and the order information table specifying "–40°C to 85°C" for all IDDB variants. The device maintains guaranteed INL, offset, and gain error performance across this full range in both 30 Hz and 60 Hz modes.
Does the LTC2451IDDB#TRMPBF require external passive components for basic operation?
No - the LTC2451IDDB#TRMPBF includes an integrated oscillator and requires no external crystal, RC network, or timing components. Only two decoupling capacitors (0.1 µF and 10 µF) between VCC and GND are mandatory for stable operation. Reference and input filtering are optional and simplified by the device's 50 nA input current.
How does the LTC2451IDDB#TRMPBF handle I²C communication during conversion?
The LTC2451IDDB#TRMPBF does not acknowledge I²C requests during active conversion. It only responds with ACK after conversion completion. If addressed mid-conversion, it issues NACK. This behavior is explicitly documented in the Applications Information section and ensures data integrity by preventing read of incomplete results.
Can the LTC2451IDDB#TRMPBF operate with a 2.5 V reference voltage?
No - the LTC2451IDDB#TRMPBF requires VREF+ – VREF– ≥ 2.5 V, but the reference pins themselves must be biased within GND to VCC. A 2.5 V reference is acceptable only if VCC ≥ 2.5 V and the differential span meets the 2.5 V minimum (e.g., REF+ = 2.5 V, REF– = 0 V). The datasheet confirms VREF+ range is VCC – 2.5 V to VCC, and VREF– is 0 to VCC – 2.5 V.
What is the purpose of the exposed pad (Pin 9) on the LTC2451IDDB#TRMPBF?
The exposed pad (Pin 9) is electrically connected to GND and serves as the primary thermal path. Per the Absolute Maximum Ratings and Pin Configuration sections, it "MUST BE SOLDERED TO PCB" to ensure proper thermal dissipation and maintain θJA = 76°C/W. Leaving it unconnected degrades thermal performance and may cause reliability issues under sustained load.
LTC2451IDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC2451IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2451IDDB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC2451IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2451IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2451IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2451IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2451IDDB#TRMPBF?
LTC2451IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2451IDDB#TRMPBF 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#TRMPBF?
For technical support, including LTC2451IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2451IDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC2451IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2451IDDB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2451IDDB#TRMPBF?
All LTC2451IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2451IDDB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2451IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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