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Analog Devices Inc. LTC2470IDD#TRPBF
- Part No.:
- LTC2470IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2470IDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,956
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Product details
Overview
LTC2470IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma ADC with integrated 1.25V precision reference, single-ended input (0V to VREF), and user-selectable 208sps or 833sps output rate. It operates from 2.7V to 5.5V, features SPI interface, auto shutdown after conversion, and delivers ±1 mV offset error, 0.01% gain error, and 2 ppm/°C reference drift - ideal for low-power industrial sensor interfaces and embedded data acquisition.
For engineers reviewing the LTC2470IDD#TRPBF datasheet, LTC2470IDD#TRPBF pinout, LTC2470IDD#TRPBF application, or LTC2470IDD#TRPBF equivalent, key selection criteria include its guaranteed 2 µA max sleep current, 3.5 mA typical conversion supply current, 12-lead DFN (3mm × 3mm) package with exposed pad, and compatibility with multiplexed analog inputs without latency or settling delay.
Technical Context
The LTC2470IDD#TRPBF implements a proprietary delta-sigma architecture with internal oscillator and no external timing components required. Its oversampling ratio is 8,192 at 208sps and 2,048 at 833sps, enabling relaxed anti-aliasing filter design. The device supports single-cycle conversion with automatic power-down of ADC core post-conversion.
It uses a synchronous SPI interface with CPOL configurable (idle-high or idle-low), supports 4-bit programming during data transfer (SPD/SLP bits), and features an input sampling scheme that reduces average input current to 50 nA - minimizing loading on external RC filters and sensor sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit direct binary output - provides 65,536 discrete codes for high-fidelity analog measurement. |
| Output Rate | Selectable 208sps or 833sps - enables trade-off between noise performance (lower rate) and throughput (higher rate). |
| Reference Voltage | 1.25V ±3 mV (1.247–1.253 V) with ≤5 ppm/°C drift (I-grade) - ensures stable full-scale range across –40°C to +85°C. |
| Offset Error | ±1 mV (max) - limits zero-scale error to <0.08% of full scale (1.25V range), critical for precision DC measurements. |
| Gain Error | ±0.01% of FS - contributes <±1 LSB error at 16-bit resolution, supporting accurate end-point calibration. |
| Supply Current | 3.5 mA typ during conversion; 2 µA max in sleep mode - enables battery-powered or energy-constrained deployments. |
| Input Type | Single-ended (IN to GND, 0V–VREF) - simplifies connection to unipolar sensors (e.g., RTDs, voltage outputs) without differential amplification. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 13). RoHS-compliant, lead-free finish. Operating temperature range: –40°C to +85°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V reference source; must be decoupled with ≤0.1µF capacitor to GND; cannot be overdriven. |
| COMP (2) | Reference compensation | Connects to 0.1µF capacitor to GND; sets reference stability and startup time; value must match or exceed REFOUT capacitor. |
| CS (3) | Chip select (active low) | Enables SDO output and initiates DATA INPUT/OUTPUT state; rising edge aborts transfer and starts new conversion. |
| SDI (4) | Serial data input | Accepts 4-bit command (EN1/EN2/SPD/SLP) to configure output rate and sleep mode; can be tied to GND/VDD for fixed-rate operation. |
| SCK (5) | Serial clock input | Controls data timing; supports CPOL = 0 or 1; max frequency 2 MHz; falling edge clocks out SDO data. |
| SDO (6) | Serial data output | 3-state output delivering 16-bit MSB-first result; high-impedance when CS is high. |
| GND (7, 11, 13) | Ground terminals | Three dedicated ground pins + exposed pad - ensure low-impedance return path for analog/digital/reference sections. |
| REF– (8) | Negative reference input | Typically connected to system ground or remote sensor ground; defines zero-input level for ADC. |
| IN (9) | Analog input (single-ended) | Input node for LTC2470; accepts 0V to VREF; high-impedance with 50 nA average sampling current. |
| GND (10) | Input ground reference | Dedicated GND pin for IN node - separates signal return from power/substrate grounds to minimize noise coupling. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF bypassing to GND for stable reference and conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency data output | Each 16-bit result corresponds exactly to the most recently completed conversion - eliminates filter delay and enables true multiplexed sampling. |
| Ultra-low input sampling current | 50 nA average - allows direct interface to high-impedance sources (e.g., thermistors, pH electrodes) and simple RC anti-aliasing without buffer amplifiers. |
| Integrated reference with low drift | 1.25V ±3 mV, ≤5 ppm/°C (I-grade) - removes need for external reference and associated layout complexity while maintaining accuracy over temperature. |
| Configurable power management | Two sleep states: NAP (ADC off, ref on) and SLEEP (ADC + ref off); achieves 2 µA max supply current - extends battery life in portable instrumentation. |
| Self-contained timing | On-chip oscillator - no external crystal or clock required; simplifies BOM and PCB layout while ensuring consistent conversion timing. |
Applications
| Industrial Process Monitoring | Environmental Sensor Interface |
|---|---|
|
Use Scenario: Measuring temperature via 3-wire RTD in factory automation PLC modules with limited board space and thermal cycling. IC Role / Device Role / Timing Role: Single-ended ADC digitizing ratiometric RTD voltage with integrated reference; provides stable 16-bit resolution across –40°C to +85°C ambient. Use Value: Eliminates external reference and calibration overhead; 2 µA sleep current enables periodic wake-up sensing without compromising battery life. |
Use Scenario: Low-power air quality monitor using electrochemical gas sensors with microamp-level output currents. IC Role / Device Role / Timing Role: Precision front-end ADC capturing slow-varying sensor voltages; leverages 50 nA input current to avoid signal degradation from series resistance. Use Value: Enables direct RC filtering (e.g., 1kΩ/0.1µF) with <1 LSB error - reduces component count and improves long-term stability vs. op-amp-based solutions. |
| Embedded System Health Monitoring | Portable Test Equipment |
|
Use Scenario: Voltage/current monitoring in medical infusion pump power supply for fault detection and compliance logging. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC measuring rail voltages and shunt-based current sense; operates from same 3.3V supply as host MCU. Use Value: 0.01% gain error and ±1 mV offset allow single-point calibration at production; SPI interface enables seamless integration with existing firmware stack. |
Use Scenario: Handheld multimeter requiring 16-bit resolution, battery operation, and fast response to user-triggered measurements. IC Role / Device Role / Timing Role: Core ADC with selectable 833sps mode for responsive readings and 208sps for low-noise averaging; auto-shutdown minimizes quiescent draw between samples. Use Value: 3.5 mA conversion current and 2 µA sleep current support >100-hour battery life on two AA cells while maintaining metrology-grade linearity. |
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 |
|---|---|---|---|
| ADS1115IRUGT | 4-channel, I²C interface, no integrated reference (requires external 2.048V ref), 880nA typical sleep current. | Better suited for multi-channel, low-pin-count I²C systems; lacks internal reference and single-cycle deterministic timing. | Choose ADS1115IRUGT when channel count >1 and I²C bus availability outweighs need for reference integration and SPI determinism. |
| MCP3424-E/ST | 4-channel, I²C, 2.048V internal reference (15 ppm/°C), 1 µA typical standby current, no programmable output rate. | Higher reference drift and fixed 15/60/240 sps rates limit flexibility in noise-throughput trade-offs. | Choose MCP3424-E/ST for cost-sensitive, multi-sensor applications where 15 ppm/°C drift is acceptable and I²C simplifies host interface. |
Compared with ADS1115IRUGT and MCP3424-E/ST, the LTC2470IDD#TRPBF offers superior reference stability (≤5 ppm/°C), deterministic SPI timing with no latency, and lower sleep current (2 µA max), making it optimal for single-channel, high-accuracy, low-power industrial sensing where timing predictability and reference autonomy are critical.
Availability
LTC2470IDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and embedded health diagnostics requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term parametric consistency.
Supply support for LTC2470IDD#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 semiconductors.
The LTC2470IDD#TRPBF belongs to Linear's precision delta-sigma ADC family, designed specifically for low-power, high-accuracy sensor signal conditioning in space-constrained industrial and instrumentation applications.
FAQ
What is the operating temperature range for the LTC2470IDD#TRPBF?
The LTC2470IDD#TRPBF is rated for –40°C to +85°C (I-grade), verified across all electrical specifications including reference drift (≤5 ppm/°C), offset error (±1 mV), and supply current. This makes LTC2470IDD#TRPBF suitable for deployment in harsh industrial environments without derating.
Does the LTC2470IDD#TRPBF require an external clock source?
No, the LTC2470IDD#TRPBF includes a fully integrated oscillator and requires no external clock components. All timing - including conversion, oversampling, and SPI synchronization - is derived internally, simplifying design and improving reliability. The LTC2470IDD#TRPBF operates with only VCC, GND, REFOUT/COMP decoupling, and SPI signals.
How does the LTC2470IDD#TRPBF achieve no-latency data output?
The LTC2470IDD#TRPBF holds the result of each completed conversion in a static register and outputs it immediately upon CS assertion - with no filter settling delay or redundant samples. This one-to-one mapping between conversion completion and serial data output enables true multiplexed sampling without software compensation, a feature confirmed in the LTC2470IDD#TRPBF functional block diagram and timing diagrams.
Can the LTC2470IDD#TRPBF drive a 0.1µF capacitor on REFOUT directly?
Yes - the LTC2470IDD#TRPBF reference output is specified to drive up to 0.1µF (and larger, per Figure 3) when paired with an equal or larger capacitor on COMP. The datasheet explicitly recommends a 0.1µF capacitor from REFOUT to GND for noise and stability, and confirms 35 mA short-circuit current capability - well above the transient demand of such capacitors during startup.
What is the maximum SCK frequency supported by the LTC2470IDD#TRPBF?
The LTC2470IDD#TRPBF supports SCK frequencies up to 2 MHz across its full operating temperature range (–40°C to +85°C), as specified in the Timing Characteristics table. Both setup/hold times (100 ns) and clock period (≥500 ns) are guaranteed under worst-case conditions, ensuring robust SPI communication with standard microcontrollers.
LTC2470IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 833
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- 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:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2470IDD#TRPBF FAQ
1.How can I place an order for LTC2470IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2470IDD#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 LTC2470IDD#TRPBF reliable?
The price and inventory of LTC2470IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2470IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2470IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2470IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2470IDD#TRPBF?
LTC2470IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2470IDD#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 LTC2470IDD#TRPBF?
For technical support, including LTC2470IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2470IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2470IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2470IDD#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 LTC2470IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2470IDD#TRPBF?
All LTC2470IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2470IDD#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 LTC2470IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2470IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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