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Analog Devices Inc. LTC2451CDDB#TRMPBF
- Part No.:
- LTC2451CDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2451CDDB#TRMPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:13,878
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Product details
Overview
LTC2451CDDB#TRMPBF 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 sensor monitoring in space-constrained industrial and environmental systems.
For engineers reviewing the LTC2451CDDB#TRMPBF datasheet, LTC2451CDDB#TRMPBF pinout, LTC2451CDDB#TRMPBF application, or LTC2451CDDB#TRMPBF equivalent, key selection criteria include its ultra-low 50 nA average input sampling current, single-cycle settling for multiplexed inputs, integrated reference flexibility (REF±), sleep-mode power of <0.2 µA, and DFN-8 (3 mm × 2 mm) package compatibility with high-density PCB layouts.
Technical Context
The LTC2451CDDB#TRMPBF employs 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 fixed 7-bit I²C slave address (0010100), supports standard/fast-mode I²C up to 400 kHz, and provides 16-bit MSB-first data output with no latency or filter settling delay. Conversion result is held indefinitely in sleep mode until read via SDA/SCL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, guaranteed no missing codes-ensures monotonicity across full scale. |
| INL | 2 LSB max-limits end-point linearity error to ±0.003% of full scale at 16-bit resolution. |
| Offset Error | 1 LSB max (30 Hz mode)-equivalent to ≤0.5 mV at VREF = 2.5 V, stable over temperature. |
| Conversion Rate | Programmable 30 or 60 sps-selectable via I²C write byte; 33.2 ms (30 Hz) or 16.6 ms (60 Hz) typical conversion time. |
| Supply Current | 400 µA during conversion, <0.2 µA in sleep-enables battery operation with sub-50 µW average power at 1 Hz read rate. |
| Input Range | GND to VCC (single-ended), referenced to external REF+ and REF−-supports rail-to-rail sensing with user-defined full-scale voltage. |
| I²C Interface | 2-wire, open-drain SDA/SCL, 400 kHz max clock-compatible with standard microcontroller peripherals without level-shifting. |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN (DDB), exposed pad (Pin 9) connected to GND. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 5, 9) | Ground reference and thermal pad | Pins 1/5 are signal ground; Pin 9 (exposed 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; must be ≥0 V and ≤(VCC − 2.5 V); differential reference span ≥2.5 V required. |
| REF+ (Pin 3) | Positive reference input | Defines upper bound of input range; must be ≤VCC and ≥(REF– + 2.5 V); sets full-scale voltage (VREF+ − VREF–). |
| VCC (Pin 4) | Positive supply | 2.7 V to 5.5 V operation; requires local 10 µF + 0.1 µF ceramic decoupling to GND (Pins 1/5/9). |
| IN (Pin 6) | Analog input | Single-ended voltage input ranging from VREF– to VREF+; 0.35 pF sampling capacitance enables low-impedance RC filtering. |
| SCL (Pin 7) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; rising edge samples SDA, falling edge outputs data. |
| 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-permits direct connection of 1 kΩ/0.1 µF RC filter with <1 LSB error, eliminating op-amp buffers. |
| Single-cycle settling | Full 16-bit accuracy achieved in one conversion-enables true multiplexed multi-channel sampling without settling delays. |
| Auto-sleep after conversion | Power drops to <0.2 µA automatically-reduces average consumption to <50 µW at 1 Hz read rate from 2.7 V supply. |
| Internal oscillator | No external timing components required-simplifies BOM and layout; eliminates crystal load capacitance sensitivity. |
| Continuous offset calibration | Active in 30 Hz mode only-maintains 1 LSB offset accuracy over time and temperature without user intervention. |
Applications
| Environmental Monitoring | System Monitoring |
|---|---|
|
Use Scenario: Measuring temperature, humidity, or gas concentration using resistive or voltage-output sensors in remote IoT nodes. IC Role / Device Role / Timing Role: ADC front-end converting analog sensor outputs to digital for microcontroller processing and wireless transmission. Use Value: 50 nA input current and rail-to-rail input range allow direct sensor interfacing; 0.2 µA sleep current extends battery life to years in low-duty-cycle deployments. |
Use Scenario: Real-time voltage, current, and temperature supervision in power supplies, servers, or motor drives. IC Role / Device Role / Timing Role: Precision measurement node feeding health telemetry to system management controllers via I²C. Use Value: 2 LSB INL and 0.02 LSB RMS noise ensure accurate fault detection thresholds; single-cycle settling supports rapid response to overvoltage events. |
| Direct Temperature Measurements | Embedded ADC Upgrades |
|
Use Scenario: Cold-junction compensation or thermistor-based temperature sensing in industrial instrumentation. IC Role / Device Role / Timing Role: High-resolution digitization of millivolt-level thermocouple or ratiometric thermistor signals. Use Value: External REF± pins enable precise reference scaling; 30 Hz mode's continuous calibration maintains ±0.1°C stability over –40°C to 85°C operating range. |
Use Scenario: Replacing legacy 12-bit or SAR ADCs in existing designs requiring higher resolution without board rework. IC Role / Device Role / Timing Role: Drop-in compatible ADC upgrade leveraging same I²C bus and footprint (DFN-8). Use Value: Pin-compatible with common 8-lead DFN layouts; identical I²C protocol simplifies firmware migration; 16-bit resolution improves dynamic range by 16×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel, programmable gain amplifier (PGA), 16-bit, 860 sps max; requires external reference; larger 10-lead VSSOP package. | Better suited for multi-channel, variable-gain sensor arrays; less optimal for ultra-low-power single-input use cases. | Select ADS1115IDGSR when multiplexing >1 sensor or needing PGA flexibility; LTC2451CDDB#TRMPBF preferred for minimal footprint and lowest quiescent current. |
| MCP3421A0T-E/CH | 18-bit, 15 sps (default), internal reference only; I²C address selectable; 8-lead SOT-23 package; no REF± pins. | Higher resolution but slower; fixed internal reference limits input range flexibility and accuracy vs. external references. | Choose MCP3421A0T-E/CH for static high-precision measurements where speed and external reference control are secondary; LTC2451CDDB#TRMPBF offers superior speed/resolution/power trade-off with design flexibility. |
Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the LTC2451CDDB#TRMPBF uniquely combines single-cycle settling, 50 nA input current, external REF± support, and sub-0.2 µA sleep in an ultra-compact DFN-making it optimal for battery-powered, space-constrained, single-input precision sensing.
Availability
LTC2451CDDB#TRMPBF is available at Aetrix Electronics and suitable for environmental monitoring, system health telemetry, and embedded sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2451CDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2451CDDB#TRMPBF belongs to Linear Technology's ultra-low-power delta-sigma ADC family, designed specifically for precision, low-cost, space-constrained sensor digitization in industrial, environmental, and portable electronics.
FAQ
What is the operating temperature range of the LTC2451CDDB#TRMPBF?
The LTC2451CDDB#TRMPBF is rated for 0°C to 70°C (Commercial grade). This is confirmed by the "C" suffix in the part number and the order information table specifying "0°C to 70°C" for the LTC2451CDDB#TRMPBF variant. The device features internal offset calibration in 30 Hz mode that maintains accuracy across this full range.
Does the LTC2451CDDB#TRMPBF require external components for basic operation?
No, the LTC2451CDDB#TRMPBF requires no external timing components-the internal oscillator eliminates need for crystals or RC networks. Basic operation only needs two decoupling capacitors (0.1 µF and 10 µF) between VCC and GND, plus a 1.7 kΩ pull-up resistor on SDA. REF+ and REF– can be tied directly to VCC and GND for simplest configuration.
How does the LTC2451CDDB#TRMPBF achieve single-cycle settling time?
The LTC2451CDDB#TRMPBF achieves single-cycle settling through its proprietary delta-sigma modulator architecture and input sampling scheme. Unlike conventional delta-sigma converters requiring multiple cycles to settle after input changes, the LTC2451CDDB#TRMPBF completes full 16-bit conversion accuracy in one cycle-enabling true multiplexed sampling without guard-band delays.
Can the LTC2451CDDB#TRMPBF operate with a 1.8 V supply?
No, the LTC2451CDDB#TRMPBF has a minimum supply voltage of 2.7 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7 V is outside datasheet specifications and may result in undefined behavior, including failure to complete conversion or incorrect I²C communication.
What is the I²C address of the LTC2451CDDB#TRMPBF?
The LTC2451CDDB#TRMPBF has a fixed 7-bit I²C slave address of 0010100 (0x24 in hexadecimal). This is factory-programmed and non-configurable. The device responds to this address followed by a read (R=1) or write (W=0) bit, and supports repeated START conditions for continuous read/write sequences.
LTC2451CDDB#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-DFN (3x2)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2451CDDB#TRMPBF FAQ
1.How can I place an order for LTC2451CDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2451CDDB#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 LTC2451CDDB#TRMPBF reliable?
The price and inventory of LTC2451CDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2451CDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2451CDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2451CDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2451CDDB#TRMPBF?
LTC2451CDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2451CDDB#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 LTC2451CDDB#TRMPBF?
For technical support, including LTC2451CDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2451CDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC2451CDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2451CDDB#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 LTC2451CDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2451CDDB#TRMPBF?
All LTC2451CDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2451CDDB#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 LTC2451CDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2451CDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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