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Analog Devices Inc. LTC2470CDD#PBF
- Part No.:
- LTC2470CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2470CDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:165
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Product details
Overview
LTC2470CDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma analog-to-digital converter with integrated 1.25V precision reference, single-ended input (0V to VREF), and selectable 208sps/833sps output rate. It operates from 2.7V–5.5V, consumes 3.5mA typical during conversion and 200nA in sleep mode, and targets high-accuracy sensor digitization in space-constrained industrial monitoring systems.
For engineers reviewing the LTC2470CDD#PBF datasheet, LTC2470CDD#PBF pinout, LTC2470CDD#PBF application, or LTC2470CDD#PBF equivalent, key selection criteria include its 2ppm/°C reference drift, ±1mV offset error, SPI interface timing compliance (2MHz SCK), 12-lead 3mm × 3mm DFN package, and single-cycle settling for multiplexed inputs without latency.
Technical Context
The LTC2470CDD#PBF implements a proprietary delta-sigma architecture with internal oscillator and oversampling ratios of 8,192 (208sps) or 2,048 (833sps), enabling relaxed anti-aliasing filter requirements. Its input sampling scheme draws only 50nA average input current, minimizing external RC filter error.
Conversion state transitions are fully autonomous: after completion, it enters NAP (ADC off, reference on) or SLEEP (both off) based on user-programmed SLP bit via SPI. Reference startup time is 12ms with 0.1µF COMP/REFOUT capacitors, and power-on reset ensures register integrity below 2.1V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct digital codes across full-scale range |
| Reference Output Voltage | 1.25V ±3mV (1.247V–1.253V) - sets ADC full-scale input range with 0.1% initial accuracy |
| Reference Drift | ±2ppm/°C (C-grade) - ensures <±0.25mV total drift over 0°C–70°C operating range |
| Offset Error | ±1mV (max) - contributes ≤0.8 LSB error at 1.25V full scale, critical for zero-point accuracy |
| Gain Error | ±0.01% FS - limits full-scale linearity deviation to <±6.6 LSB at 16-bit resolution |
| Supply Current | 3.5mA typ (conversion), 200nA max (sleep) - enables battery-powered operation with rapid wake-up |
| SPI Clock Rate | 2MHz max - supports fast data readout with standard microcontroller peripherals |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 13), rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V precision voltage source; must be decoupled with ≤0.1µF capacitor to GND |
| COMP (2) | Reference compensation | Stabilizes internal reference; requires 0.1µF capacitor to GND, value must ≥ 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 programming word (EN1, EN2, SPD, SLP) to set output rate and sleep mode |
| SCK (5) | Serial clock input | Drives SPI timing; supports CPOL = 0 or 1; falling edge clocks out data on SDO |
| 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 connections including exposed thermal pad; require low-impedance PCB plane tie |
| REF– (8) | Negative reference input | Sets ADC zero-input point; must connect directly to system ground or sensor ground sense |
| IN (9) | Single-ended analog input | Input range 0V to VREF; outputs 0x0000 for 0V, 0xFFFF for ≥VREF |
| GND (10) | Input return | Fixed ground reference for single-ended input path; not user-accessible signal node |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires parallel 10µF + 0.1µF bypass capacitors placed near pin |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Single-cycle settling enables true multiplexed input sampling without filter delay or redundant readings |
| Ultra-low input sampling current | 50nA average draw allows direct interface with simple RC filters (e.g., 1kΩ + 0.1µF adds <1 LSB error) |
| User-selectable output rate | 208sps (8,192× oversampling) or 833sps (2,048× oversampling) programmed via SPI or hardwired SDI |
| Auto shutdown architecture | Automatic NAP (ADC off) after conversion; optional SLEEP (ADC + reference off) reduces current to 200nA max |
| Integrated oscillator | Eliminates external crystal/clock components while maintaining timing accuracy across temperature |
Applications
| Industrial Process Sensor Interface | Environmental Data Logger |
|---|---|
Use Scenario: Digitizing 4–20mA loop transmitters or RTD bridge outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Single-ended ADC with integrated reference provides ratiometric measurement against stable 1.25V reference, eliminating external reference cost and layout area. Use Value: ±1mV offset and ±0.01% gain error ensure <0.1% total unadjusted error over 0°C–70°C, meeting Class A industrial sensor accuracy requirements. |
Use Scenario: Battery-powered remote air quality monitors measuring thermistor, humidity, and CO₂ sensor outputs. IC Role / Device Role / Timing Role: Low-power ADC with 200nA sleep current and automatic shutdown extends 10-year coin-cell life; SPI interface enables MCU-controlled burst sampling. Use Value: 50nA input current allows direct RC filtering without op-amp buffering, reducing BOM count and board space in compact enclosures. |
| Embedded System Health Monitoring | Calibration-Grade Test Equipment |
Use Scenario: On-board voltage/current/temperature monitoring in telecom power supplies and server VRMs. IC Role / Device Role / Timing Role: High-accuracy ADC with no-latency conversion captures transient events (e.g., rail droop, thermal spikes) without missing samples in multiplexed configurations. Use Value: 2ppm/°C reference drift ensures calibration stability over equipment lifetime, reducing field recalibration frequency and service costs. |
Use Scenario: Front-end digitization in handheld multimeters and portable calibrators requiring traceable DC voltage measurement. IC Role / Device Role / Timing Role: Precision ADC with 16-bit resolution and integrated 1.25V reference replaces discrete reference + ADC combinations, improving channel-to-channel matching. Use Value: 833sps mode with 2,048× oversampling achieves effective resolution >16.5 bits at reduced noise floor, supporting 4½-digit display accuracy. |
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 differential input, I²C interface, no integrated reference (requires external 2.048V ref), 880nA sleep current | Better suited for multi-sensor I²C bus systems; lacks single-cycle settling and ultra-low input current | Select for I²C-based designs needing channel multiplexing; avoid where SPI latency or reference integration is critical |
| MCP3424-E/ST | 4-channel delta-sigma ADC, I²C interface, integrated 2.048V reference (±15ppm/°C), 1µA sleep current | Higher reference drift limits accuracy over wide temperature ranges; no programmable output rate | Choose for cost-sensitive consumer applications; not recommended for industrial 0°C–70°C accuracy-critical use |
Compared with ADS1115IRUGT and MCP3424-E/ST, the LTC2470CDD#PBF uniquely combines single-ended input, integrated 1.25V reference with 2ppm/°C drift, 50nA input current, and no-latency conversion-making it optimal for space-constrained, high-accuracy industrial sensor nodes where SPI interface and minimal external components are prioritized.
Availability
LTC2470CDD#PBF is available at Aetrix Electronics and suitable for industrial process control, environmental data logging, and embedded system health monitoring requiring stable component supply and guaranteed long-term availability.
Supply support for LTC2470CDD#PBF 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 for precision instrumentation and industrial applications.
The LTC2470CDD#PBF belongs to Linear's precision delta-sigma ADC family, designed specifically for low-power, high-accuracy sensor digitization in space-constrained industrial and environmental monitoring systems.
FAQ
What is the operating temperature range for the LTC2470CDD#PBF?
The LTC2470CDD#PBF is specified for 0°C to 70°C operation (C-grade). This is confirmed by the "C" suffix in the part number and explicitly stated in the Absolute Maximum Ratings table under Operating Temperature Range. The DFN package's θJA of 43°C/W supports reliable thermal performance within this range when properly mounted with the exposed pad grounded.
Does the LTC2470CDD#PBF require an external clock source?
No, the LTC2470CDD#PBF does not require an external clock source. It integrates a precision internal oscillator, eliminating the need for crystals, resonators, or external clock generators. This is confirmed in the Features list ("Internal Oscillator-No External Components Required") and Block Diagram, where the "INTERNAL OSCILLATOR" block feeds the ΔΣ converter and SPI interface.
How is the output data format structured for the LTC2470CDD#PBF?
The LTC2470CDD#PBF outputs a 16-bit direct binary code via SPI, MSB-first (D15 to D0), with D15 as the most significant bit. For single-ended input, 0x0000 corresponds to 0V and 0xFFFF to ≥VREF. This format is defined in Table 1 (Output Data Format) and verified by the timing diagram in Figure 5, where SDO delivers D15 on CS fall and subsequent bits on each SCK falling edge.
Can the LTC2470CDD#PBF operate with a 2.5V supply voltage?
No, the LTC2470CDD#PBF cannot operate with a 2.5V supply. Its absolute minimum supply voltage is 2.7V, as specified in the Power Requirements table (VCC MIN = 2.7V) and Absolute Maximum Ratings. Operation below 2.7V risks improper reference startup, invalid conversions, or activation of the internal power-on reset circuit below 2.1V.
What is the maximum allowed capacitance on the REFOUT and COMP pins?
The REFOUT pin requires a capacitor ≤0.1µF to GND, and the COMP pin requires a 0.1µF capacitor to GND, with the COMP capacitor value mandated to be ≥ the REFOUT capacitor value. This is explicitly stated in the Pin Functions description for REFOUT and COMP, and reinforced in Figure 3 and Figure 4, which show startup time and noise dependence on these values.
LTC2470CDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2470CDD#PBF FAQ
1.How can I place an order for LTC2470CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2470CDD#PBF 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 LTC2470CDD#PBF reliable?
The price and inventory of LTC2470CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2470CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2470CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2470CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2470CDD#PBF?
LTC2470CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2470CDD#PBF 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 LTC2470CDD#PBF?
For technical support, including LTC2470CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2470CDD#PBF requirements.
6.How does Aetrix verify that LTC2470CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2470CDD#PBF 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 LTC2470CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2470CDD#PBF?
All LTC2470CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2470CDD#PBF, 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 LTC2470CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2470CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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