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Texas Instruments ADS7866IDBVR
- Part No.:
- ADS7866IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
ADS7866IDBVR.pdf
- Description:
- IC ADC 12BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,740
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Product details
Overview
ADS7866IDBVR from Texas Instruments is a 12-bit, 200-KSPS micro-power SAR analog-to-digital converter with SPI-compatible serial interface, single-supply operation (1.2 V to 3.6 V), ±1.5 LSB INL, and 71 dB SNR at 30 kHz - used for precision low-voltage sensor digitization in portable medical and battery-powered instrumentation.
For engineers reviewing the ADS7866IDBVR datasheet, ADS7866IDBVR pinout, ADS7866IDBVR application, or ADS7866IDBVR equivalent, this page delivers verified electrical specifications, SOT-23-6 terminal mapping, real-world use cases in isolated data acquisition and portable diagnostics, and two validated alternative parts with documented functional trade-offs.
Technical Context
The ADS7866IDBVR implements a charge redistribution SAR architecture with integrated sample-and-hold, deriving its reference internally from VDD to enable 0 V to VDD unipolar input range. Conversion is initiated on the falling edge of CS, and data is clocked out MSB-first on SDO using SCLK as both conversion clock and serial timing source.
No pipeline delays occur; minimum conversion time is fixed at 13 SCLK cycles (3.82 µs at 3.4 MHz), and auto power-down reduces supply current to 8 nA between conversions. The device supports synchronized sampling via SCLK edge control and operates across –40°C to +85°C without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - provides 4096 discrete digital codes for high-fidelity sensor signal capture |
| Throughput Rate | 200 KSPS at VDD ≥ 1.6 V - enables real-time monitoring of fast-changing physiological or industrial signals |
| INL Error | ±1.5 LSB - ensures monotonicity and <1 LSB linearity deviation over full scale for accurate calibration |
| SNR | 71 dB at fIN = 30 kHz, VDD ≥ 1.6 V - supports >11.5 effective bits for low-noise measurement systems |
| Supply Voltage | 1.2 V to 3.6 V - allows direct integration with single-cell Li-ion, coin-cell, or low-dropout regulator rails |
| Power Dissipation | 1.39 mW typical at 200 KSPS, VDD = 3.6 V - enables continuous operation in thermally constrained handheld devices |
| Auto Power-Down | 8 nA typical - eliminates standby current overhead in duty-cycled sensing applications |
Pinout & Package
ADS7866IDBVR is housed in a 6-pin SOT-23 package (DBV), with pin 1 designated REF/VDD, pin 2 GND, pin 3 VIN, pin 4 SCLK, pin 5 SDO, and pin 6 CS - all pins are CMOS-compatible and support 1.2-V logic thresholds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF/VDD (Pin 1) | Reference input and power supply | Internal reference derived from VDD; sets full-scale analog input range to 0 V–VDD |
| GND (Pin 2) | Analog and digital ground | Common return path for all analog and digital currents; must be low-impedance |
| VIN (Pin 3) | Analog input | Single-ended unipolar input accepting 0 V to VDD; internal sample/hold enabled automatically |
| SCLK (Pin 4) | Serial clock input | Controls conversion timing and data shift-out; also serves as master clock for internal SAR logic |
| SDO (Pin 5) | Serial data output | Three-state CMOS output delivering 12-bit result MSB-first; goes Hi-Z after final bit |
| CS (Pin 6) | Chip select | Active-low initiation signal; falling edge triggers sampling and conversion sequence |
Key Features
| Feature | Design Value |
|---|---|
| SPI-compatible serial interface | Direct connection to microcontroller SPI peripherals without level-shifting or protocol translation |
| No missing codes (12-bit NMC) | Guarantees monotonic transfer function across full temperature range - critical for closed-loop control |
| Internal VDD-referenced conversion | Eliminates need for external reference IC or precision resistor divider, reducing BOM count and layout area |
| 13-cycle deterministic conversion | Fixed latency of 3.82 µs at 3.4 MHz enables precise timing synchronization in time-sensitive systems |
| Ultra-low shutdown current | 8 nA typical auto power-down current extends battery life in intermittent-sampling applications |
Applications
| Battery-Powered ECG Monitor | Isolated Industrial Sensor Node |
|---|---|
|
Use Scenario: Digitizing low-amplitude biopotential signals (0.5–5 mV) from dry electrodes in a wearable cardiac monitor powered by a 3.0-V coin cell. IC Role / Device Role / Timing Role: Primary ADC capturing filtered ECG waveform at 200 KSPS with 12-bit resolution and 71 dB SNR to preserve QRS complex fidelity. Use Value: 1.2-V minimum supply and 8-nA shutdown current extend operational life beyond 72 hours per battery charge. |
Use Scenario: Measuring 4–20 mA loop current in hazardous-area field transmitters using galvanically isolated power and signal paths. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned analog sensor output into digital data for SPI transmission across capacitive isolation barrier. Use Value: Single-supply 1.2–3.6 V operation simplifies isolated DC/DC design; no external reference reduces component count in compact modules. |
| Portable Glucose Meter | Low-Power Environmental Data Logger |
|
Use Scenario: Reading electrochemical current from test-strip biosensors under variable ambient temperature (–10°C to +50°C) and limited battery capacity. IC Role / Device Role / Timing Role: Precision front-end ADC acquiring analog output from transimpedance amplifier with ±1.5 LSB INL for calibrated glucose concentration calculation. Use Value: Guaranteed monotonicity and 12-bit NMC ensure repeatable calibration across batches and temperature extremes. |
Use Scenario: Logging temperature, humidity, and CO₂ levels in remote agricultural sensors powered by energy-harvesting circuits (<100 µW average available). IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated every 10 seconds to digitize sensor outputs before returning to 8-nA shutdown state. Use Value: Sub-µA quiescent current during idle periods maximizes energy harvesting efficiency and extends deployment interval to >1 year. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7866IDBVT | Same silicon die and specs; differs only in packaging - small tape-and-reel (250-unit) vs. standard reel (3000-unit) | Identical performance and PCB footprint; selected for prototyping or low-volume production | Choose ADS7866IDBVT for evaluation or pilot builds where smaller reels reduce inventory overhead |
| ADS7886IDBVR | 12-bit, 1-MSPS SAR ADC with wider supply range (2.35 V–5.25 V); requires external reference; higher power (3.5 mW at 1 MSPS) | Higher speed and accuracy but incompatible with sub-1.6-V operation; not suitable for coin-cell or single-LiFePO₄ systems | Choose ADS7886IDBVR only when throughput >200 KSPS and supply ≥2.35 V are required - not a drop-in replacement |
Compared with ADS7866IDBVR, ADS7866IDBVT offers identical electrical behavior in a smaller reel format ideal for development, while ADS7886IDBVR trades ultra-low-voltage capability for higher speed and external reference flexibility - making it unsuitable for battery-constrained designs but viable in higher-voltage industrial controllers.
Availability
ADS7866IDBVR is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and isolated sensor interfaces requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ADS7866IDBVR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power system solutions.
The ADS7866IDBVR belongs to TI's micro-power SAR ADC family designed specifically for energy-constrained, space-limited applications such as portable diagnostics, wearables, and distributed industrial sensors - emphasizing supply voltage scalability and minimal external component count.
FAQ
What is the maximum sampling rate of the ADS7866IDBVR at 1.2 V supply?
The ADS7866IDBVR achieves a maximum throughput rate of 100 KSPS when operated at VDD = 1.2 V, as specified in the SLAS465 datasheet. This reduced rate maintains 12-bit accuracy and ±1.5 LSB INL while enabling compatibility with ultra-low-voltage energy sources like primary lithium cells. At 1.6 V or higher, the ADS7866IDBVR delivers its full 200-KSPS capability.
Does the ADS7866IDBVR require an external voltage reference?
No, the ADS7866IDBVR does not require an external voltage reference. It uses an internal reference derived directly from the VDD supply, establishing a 0 V to VDD unipolar input range. This eliminates the need for external reference ICs or resistor networks, simplifying design and reducing bill-of-materials cost - a key advantage confirmed in the device's "DESCRIPTION" and "FEATURES" sections.
What is the pin configuration and package type of the ADS7866IDBVR?
The ADS7866IDBVR uses a 6-pin SOT-23 package (DBV designation) with the following top-view pinout: Pin 1 = REF/VDD, Pin 2 = GND, Pin 3 = VIN, Pin 4 = SCLK, Pin 5 = SDO, Pin 6 = CS. This mapping is explicitly defined in the "PIN CONFIGURATION" and "TERMINAL FUNCTIONS" sections of the SLAS465 datasheet and is consistent across all ADS7866 variants.
How does the auto power-down feature work in the ADS7866IDBVR?
The ADS7866IDBVR automatically enters power-down mode after each conversion completes and SDO transitions to high-impedance. In this state, supply current drops to 8 nA typical (300 nA max), as verified in the "POWER DISSIPATION" table. Power-down is fully automatic - no software command or external control signal is needed - making it ideal for duty-cycled sensing applications where the ADC is active only briefly per measurement cycle.
Is the ADS7866IDBVR compatible with standard SPI interfaces?
Yes, the ADS7866IDBVR features a SPI-compatible serial interface: CS acts as frame sync (active low), SCLK provides clocking, and SDO outputs MSB-first data with no dummy cycles. It supports standard SPI modes (CPOL = 0, CPHA = 0) and requires no special initialization - confirmed by the "SPI Compatible Serial Interface" feature bullet and timing diagram in the SLAS465 datasheet. Microcontroller SPI peripherals can drive it directly.
ADS7866IDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 1.2V ~ 3.6V
- Voltage - Supply, Digital:
- 1.2V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7866IDBVR FAQ
1.How can I place an order for ADS7866IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7866IDBVR 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 ADS7866IDBVR reliable?
The price and inventory of ADS7866IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7866IDBVR is usually 5 days.
3.What payment methods are accepted for ADS7866IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7866IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7866IDBVR?
ADS7866IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7866IDBVR 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 ADS7866IDBVR?
For technical support, including ADS7866IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7866IDBVR requirements.
6.How does Aetrix verify that ADS7866IDBVR is sourced from the original manufacturer or authorized distributors?
All ADS7866IDBVR 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 ADS7866IDBVR meets industry standards.
7.What is the process for return or replacement of ADS7866IDBVR?
All ADS7866IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7866IDBVR, 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 ADS7866IDBVR part is unused and in its original packaging.
Return procedure for ADS7866IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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