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Analog Devices Inc. LTC2451CDDB#TRPBF
- Part No.:
- LTC2451CDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2451CDDB#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
LTC2451CDDB#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma analog-to-digital converter with single-ended input, I²C interface, and internal oscillator. It operates from 2.7V to 5.5V, delivers ≤2 LSB INL and 0.02 LSB RMS noise, and supports programmable 30/60 sps conversion rates - ideal for low-power system monitoring and embedded sensor interfaces.
For engineers reviewing the LTC2451CDDB#TRPBF datasheet, LTC2451CDDB#TRPBF pinout, LTC2451CDDB#TRPBF application, or LTC2451CDDB#TRPBF equivalent, key selection considerations include its ultra-low 50 nA average input sampling current, single-cycle settling for multiplexed inputs, integrated reference support (REF+/REF–), sleep-mode current <0.2 µA, and DFN-8 (3 mm × 2 mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2451CDDB#TRPBF implements a proprietary delta-sigma modulator core with on-chip oscillator and continuous internal offset calibration in 30 Hz mode. Its input sampling architecture draws only 50 nA average current, enabling direct RC filtering without buffer amplifiers.
It uses a hardwired I²C slave address (0010100b), supports standard/fast-mode I²C up to 400 kHz, and outputs 16-bit MSB-first data with no latency or filter delay. Conversion time is 33.2 ms (30 Hz mode) or 16.6 ms (60 Hz mode), and full-scale range is set by external differential reference voltage (VREF+ – VREF– ≥ 2.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, guaranteed no missing codes - ensures monotonicity and full code coverage across full input range. |
| INL | ±2 LSB max - limits end-point linearity error to <0.03% of full scale at 16-bit resolution. |
| Offset Error | ±0.5 mV (30 Hz mode) - contributes <0.1 LSB error at 3 V full scale with 2.5 V reference. |
| Supply Current | 400 µA during conversion, <0.2 µA in sleep - enables battery-powered operation with sub-50 µW average power at 1 Hz read rate. |
| Input Sampling Current | 50 nA average - allows direct connection of 1 kΩ/0.1 µF RC filter with <1 LSB added error. |
| I²C Interface | 2-wire, 400 kHz max clock - compatible with standard microcontroller peripherals without custom timing logic. |
| Reference Input | Differential REF+/REF–, 2.5 V to VCC range - supports ratiometric or precision external references, including LT6660. |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN (DDB), exposed pad (Pin 9) connected to GND. RoHS-compliant, 0°C to 70°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 5, 9) | Ground reference and thermal pad | Pins 1/5 are signal GND; Pin 9 is exposed thermal pad - must be soldered to PCB ground plane for thermal and electrical integrity. |
| REF– (Pin 2) | Negative reference input | Defines lower bound of input range; accepts 0 V to (VCC – 2.5 V); differential with REF+ sets full-scale span. |
| REF+ (Pin 3) | Positive reference input | Defines upper bound of input range; accepts (VCC – 2.5 V) to VCC; differential with REF– sets full-scale span. |
| VCC (Pin 4) | Positive supply | 2.7 V to 5.5 V single supply; requires local 0.1 µF + 10 µF decoupling to GND (Pin 1). |
| IN (Pin 6) | Analog input | Single-ended input referenced to REF–/REF+; accepts VREF– to VREF+; 0.35 pF sampling capacitance. |
| SCL (Pin 7) | I²C clock input | Slave-only interface; accepts 0–400 kHz external clock; rising edge samples SDA, falling edge outputs data. |
| SDA (Pin 8) | I²C bidirectional data | Open-drain output requiring external 1.7 kΩ pull-up to VCC; transmits 16-bit conversion result MSB-first. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input sampling current | 50 nA average - eliminates need for input buffering and enables high-impedance sensor interfacing with minimal loading. |
| Single-cycle settling time | One conversion per channel access - removes dead time between multiplexed inputs, simplifying firmware for multi-sensor systems. |
| Auto shutdown after conversion | Enters <0.2 µA sleep mode automatically - reduces average power to <50 µW at 1 Hz read rate from 2.7 V supply. |
| Integrated oscillator | No external crystal or RC network required - eliminates BOM cost, layout area, and frequency drift concerns. |
| Continuous offset calibration (30 Hz mode) | Transparent internal correction over temperature and time - maintains ±0.5 mV offset spec without user intervention. |
Applications
| System Monitoring | Environmental Monitoring |
|---|---|
Use Scenario: Real-time measurement of supply rail voltages, battery levels, and board temperature in industrial controllers. IC Role / Device Role / Timing Role: ADC front-end converting analog sensor outputs to digital values for host MCU via I²C. Use Value: 16-bit resolution and <2 LSB INL enable detection of <10 mV changes on 3.3 V rails; low sleep current extends uptime in battery-backed systems. |
Use Scenario: Low-power air quality or humidity sensing nodes deployed in remote locations. IC Role / Device Role / Timing Role: Precision digitizer for resistive or capacitive environmental sensors interfaced directly to REF+/REF–. Use Value: 50 nA input current allows direct RC filtering of noisy sensor signals; 30 Hz mode provides stable readings with automatic offset drift compensation. |
| Direct Temperature Measurements | Instrumentation |
Use Scenario: Cold-junction compensation and thermocouple voltage digitization in portable test equipment. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC capturing millivolt-level thermocouple outputs with ratiometric reference. Use Value: 0.02 LSB RMS noise (<1.5 µV at 2.5 V ref) resolves sub-0.1°C increments; differential REF+/REF– rejects common-mode noise from long sensor leads. |
Use Scenario: Upgrading legacy 12-bit ADCs in handheld multimeters or data loggers requiring higher resolution. IC Role / Device Role / Timing Role: Drop-in replacement ADC with I²C interface, eliminating need for parallel bus logic or external clock sources. Use Value: Pin-compatible DFN-8 footprint and identical I²C protocol simplify redesign; 16-bit output improves dynamic range by 16× vs 12-bit predecessors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel input mux, PGA (1–16×), 860 sps max, 150 nA input bias current | Supports differential/muxed inputs and programmable gain; higher power (150 µA active) | Choose ADS1115IDGSR when multi-channel scanning or signal amplification is required; LTC2451CDDB#TRPBF preferred for lowest input current and smallest footprint. |
| MCP3424-E/SL | 4-channel, 18-bit resolution, 3.75–15 sps, 2.5 µA typical supply current | Slower conversion, higher power, no auto-shutdown, requires external oscillator | Choose MCP3424-E/SL for higher resolution at low speed; LTC2451CDDB#TRPBF offers better power efficiency and simpler integration for 16-bit, 30–60 sps use cases. |
Compared with ADS1115IDGSR and MCP3424-E/SL, the LTC2451CDDB#TRPBF delivers the lowest input sampling current (50 nA), smallest DFN-8 package (3 mm × 2 mm), and fully autonomous operation - making it optimal for ultra-low-power, space-constrained, single-input precision sensing where minimal external components are critical.
Availability
LTC2451CDDB#TRPBF is available at Aetrix Electronics and suitable for system monitoring, environmental sensing, and instrumentation applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LTC2451CDDB#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC2451CDDB#TRPBF belongs to Linear Technology's ultra-low-power delta-sigma ADC product line, designed specifically for precision, low-cost, and minimal-footprint sensor digitization in battery-operated and space-constrained embedded systems.
FAQ
What is the operating temperature range of the LTC2451CDDB#TRPBF?
The LTC2451CDDB#TRPBF is specified for commercial-grade operation from 0°C to 70°C. This is confirmed by the "C" grade suffix in the part number and the ordering information table in the datasheet, which lists LTC2451CDDB#TRPBF under the 0°C to 70°C temperature range. The device uses the DDB (3 mm × 2 mm DFN) package with exposed pad grounded for thermal performance.
Does the LTC2451CDDB#TRPBF require external components for basic operation?
No - the LTC2451CDDB#TRPBF includes an integrated oscillator and requires no external clock components. For stable operation, only two decoupling capacitors are mandatory: a 0.1 µF ceramic capacitor and a 10 µF ceramic capacitor between VCC and GND, placed as close as possible to Pins 4 and 1/5. No external reference, filter, or pull-up resistors are strictly required, though a 1.7 kΩ pull-up on SDA is needed for I²C communication.
How does the LTC2451CDDB#TRPBF handle input overrange and underrange conditions?
The LTC2451CDDB#TRPBF clamps output codes at the extremes: for input voltages below VREF–, it outputs code 0x0000; for inputs above VREF+, it outputs code 0xFFFF. This behavior is explicitly defined in the Applications Information section, where it states that "in an underrange condition… the converter will generate the output code 0" and "in an overrange condition… the converter will generate the output code 65535."
What I²C address does the LTC2451CDDB#TRPBF use, and is it configurable?
The LTC2451CDDB#TRPBF uses a fixed 7-bit I²C slave address of 0010100b (0x24). This address is factory-hardwired and not configurable. The device responds only to this address followed by a read (R=1) or write (W=0) bit. It does not support address pins or alternative addressing schemes - a detail confirmed in the "I2C INTERFACE" and "APPLICATIONS INFORMATION" sections of the datasheet.
Can the LTC2451CDDB#TRPBF operate with a single-ended reference configuration?
Yes - the LTC2451CDDB#TRPBF supports single-ended reference configuration by connecting REF+ to VCC and REF– to GND. The datasheet explicitly states: "If VREF+ = VCC and VREF– = GND, the input voltage can range from GND to VCC." This setup enables rail-to-rail input operation without external reference components, simplifying design for non-ratiometric applications.
LTC2451CDDB#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-DFN (3x2)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2451CDDB#TRPBF FAQ
1.How can I place an order for LTC2451CDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2451CDDB#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 LTC2451CDDB#TRPBF reliable?
The price and inventory of LTC2451CDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2451CDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2451CDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2451CDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2451CDDB#TRPBF?
LTC2451CDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2451CDDB#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 LTC2451CDDB#TRPBF?
For technical support, including LTC2451CDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2451CDDB#TRPBF requirements.
6.How does Aetrix verify that LTC2451CDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2451CDDB#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 LTC2451CDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2451CDDB#TRPBF?
All LTC2451CDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2451CDDB#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 LTC2451CDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2451CDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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