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Texas Instruments ADS7868IDBVT
- Part No.:
- ADS7868IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-6
- Datasheet:
-
ADS7868IDBVT.pdf
- Description:
- IC ADC 8BIT SAR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:773
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Product details
Overview
ADS7868IDBVT from Texas Instruments is an 8-bit, 280-KSPS micro-power SAR analog-to-digital converter with SPI-compatible serial interface, single-supply operation (1.2 V to 3.6 V), and internal reference derived from VDD. It features 0 V to VDD unipolar input range, auto power-down (8 nA typ), and 6-pin SOT-23 packaging - designed for ultra-low-power portable data acquisition systems.
For engineers reviewing the ADS7868IDBVT datasheet, ADS7868IDBVT pinout, ADS7868IDBVT application, or ADS7868IDBVT equivalent, this page delivers verified electrical specs, timing-critical interface behavior, industrial temperature support (–40°C to 85°C), and real-world substitution guidance for battery-powered sensor front-ends and isolated measurement nodes.
Technical Context
The ADS7868IDBVT implements a charge redistribution SAR architecture with integrated sample-and-hold, eliminating external hold capacitors. Conversion is initiated on the falling edge of CS, and digital output is synchronized to SCLK - requiring exactly 9 SCLK cycles per conversion at 3.4 MHz for 280-KSPS throughput.
It uses internal supply-derived reference (REF/VDD pin), enabling true rail-to-rail unipolar input (0 V to VDD) without external components. Auto power-down activates immediately after SDO tri-states, reducing IDD to 8 nA typical between conversions - critical for duty-cycled sensing in energy-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes; sufficient for basic sensor digitization and control feedback loops. |
| Throughput Rate | 280 KSPS at VDD ≥ 1.6 V - supports high-speed sampling of fast transients in portable test equipment. |
| Supply Voltage Range | 1.2 V to 3.6 V - enables direct integration with single-cell Li-ion (3.0–3.6 V), NiMH (1.2 V), or regulated 1.8 V/2.5 V rails. |
| INL / DNL | ±0.5 LSB - ensures monotonicity and <0.2% full-scale linearity error across industrial temperature range. |
| Power Consumption | 0.42 mW at 280 KSPS, VDD = 1.6 V - extends battery life in multi-day wearable or remote sensor deployments. |
| Auto Power-Down Current | 8 nA typical - reduces quiescent draw to negligible levels during idle intervals in low-duty-cycle applications. |
| Input Range | 0 V to VDD - eliminates need for level-shifting or external reference, simplifying analog front-end design. |
Pinout & Package
ADS7868IDBVT is housed in a 6-pin SOT-23 package (DBV), measuring 2.9 mm × 1.6 mm × 1.0 mm, optimized for space-constrained PCB layouts in handheld instrumentation and medical patches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF/VDD | Power supply and internal reference source | Supplies core logic and sets full-scale ADC range (0 V to VDD); no external reference required. |
| GND | Analog and digital ground reference | Single ground connection for both analog input and digital interface; requires low-impedance layout. |
| VIN | Analog signal input | Single-ended unipolar input accepting 0 V to VDD; internally sampled via integrated S/H capacitor. |
| SCLK | Serial clock input | Controls conversion timing and data shift-out; minimum cycle time 6.7 µs at VDD ≥ 2.5 V. |
| SDO | Serial data output | 3-state MSB-first SPI output; tri-states automatically after 8 valid bits; includes 4 leading zeros. |
| CS | Active-low chip select | Initiates conversion on falling edge; frames output data; must remain low for entire 9-SCLK cycle. |
Key Features
| Feature | Design Value |
|---|---|
| SPI-compatible serial interface | Direct drop-in compatibility with standard microcontroller SPI peripherals - no custom firmware drivers needed. |
| No pipeline delays | Deterministic 9-clock-cycle latency enables precise timing-critical sampling in closed-loop control systems. |
| Internal supply-derived reference | Removes external reference IC and associated BOM cost, layout area, and calibration drift concerns. |
| 0 V to VDD unipolar input | Supports direct connection of sensors with ground-referenced outputs (e.g., thermistors, current shunts). |
| Industrial temperature range | Guaranteed 8-bit performance from –40°C to +85°C - suitable for outdoor environmental monitors and factory-floor sensors. |
Applications
| Battery-Powered Sensor Node | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Continuous voltage monitoring of lithium coin-cell battery in wireless IoT endpoint. IC Role / Device Role / Timing Role: ADC digitizes battery voltage every 500 ms using microcontroller-triggered CS pulses; SDO data read synchronously with SCLK. Use Value: 0.42 mW active power and 8 nA auto power-down extend 200-mAh cell life to >5 years in sleep-dominated operation. |
Use Scenario: Galvanically isolated analog input stage in industrial PLC module using optocoupled SPI lines. IC Role / Device Role / Timing Role: ADC samples field sensor signals on isolated side; CS/SCLK/SDO routed through high-speed optocouplers with minimal timing skew. Use Value: 9-SCLK deterministic conversion time and no pipeline delay simplify isolation timing budget and reduce jitter-induced quantization error. |
| Portable Medical Instrument | Automatic Test Equipment (ATE) |
|
Use Scenario: Pulse oximeter front-end digitizing photodiode current via transimpedance amplifier. IC Role / Device Role / Timing Role: ADC operates from 1.8 V rail; VIN accepts 0–1.8 V amplified photocurrent; CS triggered by MCU timer at 200 Hz. Use Value: ±0.5 LSB INL ensures accurate SpO₂ calculation across patient skin tones; 6-pin SOT-23 fits tight flex PCB space. |
Use Scenario: Low-cost channel expansion in benchtop multimeter for auxiliary voltage measurement path. IC Role / Device Role / Timing Role: ADC provides 8-bit auxiliary reading alongside main 24-bit converter; shares same SCLK domain for synchronized capture. Use Value: SPI interface allows reuse of existing controller firmware; 280-KSPS rate supports 50/60 Hz harmonic analysis without aliasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7868IDBVR | Same die, tape-and-reel packaging (3000-unit reel vs. 250-unit small reel) | Identical electrical performance; selected for high-volume production runs | Choose ADS7868IDBVR for automated assembly; ADS7868IDBVT for prototyping or low-volume builds. |
| ADS7888IDBVT | 8-bit, 1-MSPS, 2.35–5.25 V supply - higher speed but incompatible low-voltage operation | Requires ≥2.35 V supply; unsuitable for 1.2–1.8 V battery systems | Select ADS7888IDBVT only when higher throughput and wider supply margin are available; not drop-in for 1.2 V designs. |
Compared with ADS7868IDBVT, ADS7868IDBVR offers identical functionality in volume-optimized packaging, while ADS7888IDBVT trades ultra-low-voltage capability for speed and noise performance - making ADS7868IDBVT uniquely suited for sub-1.6 V energy harvesting and primary-cell applications.
Availability
ADS7868IDBVT is available at Aetrix Electronics and suitable for battery-powered systems, isolated data acquisition, portable medical instruments, and automatic test equipment requiring stable component supply across long product lifecycles.
Supply support for ADS7868IDBVT 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 delivering analog and embedded processing solutions with over 50 years of innovation in precision data converters and low-power design.
The ADS786x family targets ultra-low-power, miniature SAR ADC applications - specifically engineered for portable, battery-operated, and space-constrained systems where supply voltage flexibility and minimal quiescent current are critical.
FAQ
What is the maximum sampling rate of the ADS7868IDBVT at 1.2 V supply?
The ADS7868IDBVT achieves a maximum throughput rate of 140 KSPS when operated at VDD = 1.2 V, using fSCLK = 1.7 MHz and requiring 9 SCLK cycles per conversion. This is specified across the full industrial temperature range (–40°C to +85°C) and ensures monotonic 8-bit operation with ±0.5 LSB INL.
Does the ADS7868IDBVT require an external reference voltage?
No, the ADS7868IDBVT does not require an external reference. Its REF/VDD pin serves as both power supply and internal reference source, establishing a 0 V to VDD unipolar input range. This eliminates external reference components and associated calibration drift, simplifying design for cost-sensitive portable applications.
How many clock cycles does the ADS7868IDBVT need to complete one conversion?
The ADS7868IDBVT requires exactly 9 SCLK cycles to complete one 8-bit conversion. This is fixed per device variant (ADS7866 = 13, ADS7867 = 11, ADS7868 = 9) and defines the minimum conversion time - e.g., 2.647 µs at fSCLK = 3.4 MHz - enabling precise timing predictability in real-time systems.
What is the power consumption of the ADS7868IDBVT during active conversion at 3.6 V?
At VDD = 3.6 V and fSAMPLE = 280 KSPS, the ADS7868IDBVT draws 439 µA typical supply current, resulting in 1.58 mW typical power dissipation. This value is measured under full-load conditions with SCLK active and includes all internal logic, SAR array, and output driver currents.
Can the ADS7868IDBVT interface directly with a 3.3 V microcontroller SPI port?
Yes, the ADS7868IDBVT supports VIH up to 3.6 V and VOL ≤ 0.2 V at ISINK = 200 µA, making it fully compatible with 3.3 V logic-level microcontrollers. Its CMOS inputs accept 0.7×VDD minimum high-level threshold, and SDO output drives VDD–0.2 V high - ensuring robust signal integrity without level shifters.
ADS7868IDBVT 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:
- 8
- Sampling Rate (Per Second):
- 280k
- 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:
- Supply
- 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:
- -
ADS7868IDBVT FAQ
1.How can I place an order for ADS7868IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7868IDBVT 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 ADS7868IDBVT reliable?
The price and inventory of ADS7868IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7868IDBVT is usually 5 days.
3.What payment methods are accepted for ADS7868IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7868IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7868IDBVT?
ADS7868IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7868IDBVT 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 ADS7868IDBVT?
For technical support, including ADS7868IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7868IDBVT requirements.
6.How does Aetrix verify that ADS7868IDBVT is sourced from the original manufacturer or authorized distributors?
All ADS7868IDBVT 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 ADS7868IDBVT meets industry standards.
7.What is the process for return or replacement of ADS7868IDBVT?
All ADS7868IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7868IDBVT, 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 ADS7868IDBVT part is unused and in its original packaging.
Return procedure for ADS7868IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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