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Texas Instruments ADS8318IBDGST
- Part No.:
- ADS8318IBDGST
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8318IBDGST.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,654
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Product details
Overview
ADS8318IBDGST from Texas Instruments is a 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with unipolar differential input (–VREF to +VREF), SPI-compatible serial interface, and zero-latency operation at full speed. It operates from 2.048 V to 5.5 V external reference and consumes 18 mW typical at 500 kSPS, supporting precision data acquisition in battery-powered instrumentation.
For engineers reviewing the ADS8318IBDGST datasheet, ADS8318IBDGST pinout, ADS8318IBDGST application, or ADS8318IBDGST equivalent, key selection considerations include its ±1.0 LSB max INL, ±0.75 LSB max DNL, 95.2 dB SNR at 10 kHz, 10-pin MSOP package, and daisy-chain-capable SPI interface for multi-channel systems.
Technical Context
The ADS8318IBDGST implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion without pipeline delay. Its internal charge redistribution circuitry samples the differential input during acquisition and performs conversion using a fixed internal clock - independent of SCLK timing.
It supports two primary interface modes: CS mode (3- or 4-wire) and daisy-chain mode, selectable via SDI logic level at CONVST rising edge. A busy indicator bit (optional) simplifies synchronization with host processors, and power scales linearly with throughput (3.6 mW per 100 kSPS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization. |
| Sample Rate | 500 kSPS - enables real-time capture of signals up to ~15 MHz small-signal bandwidth. |
| INL / DNL | ±1.0 LSB max / ±0.75 LSB max - ensures monotonicity and <0.0015% full-scale linearity error. |
| SNR @ 10 kHz | 95.2 dB typ - corresponds to ~15.5 effective bits (ENOB) for low-noise sensor or audio front-end use. |
| Power @ 500 kSPS | 18 mW typ (+VA = 5 V) - ultra-low active power suitable for portable or energy-constrained systems. |
| Reference Range | 2.048 V to 4.096 V - compatible with standard precision voltage references (e.g., REF5025, REF3025). |
| Package | 10-pin MSOP (DGS) - 3 mm × 3 mm footprint with exposed thermal pad for thermal management. |
Pinout & Package
ADS8318IBDGST is housed in a 10-pin MSOP (DGS) package with GND-centered thermal pad. Pin functions are validated per TI SLAS568A datasheet Figure 1 (MSOP top view) and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Analog reference input | Accepts external 2.048–4.096 V reference; requires 0.1 µF bypass + 10 µF storage capacitor to GND. |
| 2 +VA | Analog supply | 4.5–5.5 V analog rail; decoupled to GND; powers SAR core and input buffer. |
| 3 +IN | Differential analog input (+) | Noninverting input; common-mode voltage = VREF/2; input capacitance = 59 pF. |
| 4 –IN | Differential analog input (–) | Inverting input; forms differential pair with +IN; supports unipolar swing –VREF to +VREF. |
| 5 GND | Common ground | Shared return for +VA and +VBD; critical for noise isolation between analog/digital sections. |
| 6 CONVST | Conversion start / chip select | Rising edge initiates sampling; doubles as CS in 3-wire mode; controls busy indicator behavior. |
| 7 SDO | Serial data output | SPI-compatible output; tri-state controlled by CONVST/SCLK; outputs MSB first, LSB last. |
| 8 SCLK | Serial clock input | Host-provided clock (min 20 ns period); synchronizes data transfer; supports daisy-chain timing. |
| 9 SDI | Serial data input | Mode-select input (CS vs. daisy-chain); also serves as CS in 4-wire interface. |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V digital rail; powers interface logic; must be decoupled independently from +VA. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid result immediately after conversion completes - no pipeline delay affects real-time control loops. |
| Daisy-chain SPI interface | Enables cascading multiple ADS8318 devices on single SCLK/SDO/SDI lines - reduces PCB trace count and MCU GPIO usage. |
| Linear power scaling | Consumes 3.6 mW per 100 kSPS - allows dynamic throughput adjustment to match system power budget without firmware change. |
| Low-power shutdown | Draws only 0.25 µW typ in power-down state - ideal for intermittent sampling or sleep-mode operation in battery systems. |
| Robust AC performance | 95.2 dB SNR and –108 dB THD at 10 kHz enable accurate measurement of low-distortion sensor or medical waveforms. |
Applications
| Portable Data Logger | Industrial Process Monitor |
|---|---|
|
Use Scenario: Battery-powered field instrument acquiring thermocouple, strain gauge, or pressure sensor outputs over 24-hour deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog inputs; synchronized to microcontroller via CONVST-triggered SPI reads. Use Value: 18 mW active power and 0.25 µW shutdown current extend battery life; ±0.75 LSB DNL ensures repeatability across temperature. |
Use Scenario: DIN-rail PLC module monitoring analog 4–20 mA loop signals from flow meters and valve positioners. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing to isolated analog inputs; daisy-chained with other ADS8318 units for multi-channel expansion. Use Value: 95.2 dB SNR rejects industrial noise; 500-kSPS rate captures transient events; MSOP package fits dense I/O modules. |
| Medical Patient Monitor | Optical Network Diagnostics |
|
Use Scenario: Compact ECG or pulse oximeter unit digitizing low-amplitude biopotential signals with minimal added noise. IC Role / Device Role / Timing Role: Precision SAR ADC driving low-noise amplifiers; referenced to stable 2.5 V source; sampled at 500 Hz–10 kHz rates. Use Value: ±1.0 LSB INL preserves clinical waveform fidelity; 59 pF input capacitance minimizes loading on high-Z sensor circuits. |
Use Scenario: Optical transceiver module measuring laser bias current and photodiode feedback for closed-loop power control. IC Role / Device Role / Timing Role: Fast, low-drift ADC capturing real-time optical power telemetry; interfaced to FPGA via SPI with busy indicator for deterministic timing. Use Value: Zero-latency operation enables sub-microsecond response to power fluctuations; 10 kHz SNR supports high-resolution calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDRCT | 16-bit, 1-MSPS, 2.7–5.5 V supply, no daisy-chain mode, 10-pin SON package | Higher speed but lacks daisy-chain and busy indicator - less suitable for multi-device synchronization | Choose when maximum throughput >500 kSPS is required and board layout favors SON over MSOP. |
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, 2.3–5.5 V, pseudo-differential input, SPI with busy, 10-pin LFCSP | Lower speed, smaller package, but higher INL (±2.5 LSB) and lower SNR (92.5 dB) | Choose for space-constrained designs where 250 kSPS suffices and cost sensitivity outweighs SNR/linearity needs. |
Compared with ADS8318IBDGST, ADS8320IDRCT offers higher sample rate but sacrifices interface flexibility and package compatibility, while AD7682BCPZ-RL7 trades speed and precision for compactness and lower cost - making ADS8318IBDGST optimal for balanced performance, power, and multi-device scalability.
Availability
ADS8318IBDGST is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and medical diagnostics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8318IBDGST 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 design.
The ADS8318IBDGST belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and interface-flexible data acquisition in portable, industrial, and medical systems.
FAQ
What is the maximum recommended reference voltage for ADS8318IBDGST?
The ADS8318IBDGST supports an external reference input range of 2.048 V to 4.096 V, with typical characterization at 4.0 V and 5.0 V. Operation above 4.096 V is not specified and may degrade INL/DNL performance or violate absolute maximum ratings. For best accuracy, use a low-noise, low-drift reference such as the REF5025 (2.5 V) or REF3040 (4.096 V) with proper decoupling per the ADS8318IBDGST datasheet.
Does ADS8318IBDGST require an external clock for conversion?
No - the ADS8318IBDGST uses an internal clock for the SAR conversion process, making it fully autonomous once CONVST is asserted. The external SCLK is used only for serial data readout and does not affect conversion timing. This eliminates clock jitter sensitivity in the analog path and simplifies system timing design compared to externally clocked ADCs.
Can ADS8318IBDGST operate with separate analog and digital ground planes?
Yes, but with strict layout discipline: ADS8318IBDGST uses a single GND pin (Pin 5) for both +VA and +VBD returns. To maintain performance, connect analog and digital ground planes at this pin only - avoid splitting GND or routing noisy digital traces near analog inputs. Use separate +VA/+VBD decoupling capacitors tied directly to Pin 5, and route REFIN/+IN/–IN away from digital signal paths.
How does the daisy-chain mode function on ADS8318IBDGST?
Daisy-chain mode is enabled when SDI is low at the CONVST rising edge. In this mode, multiple ADS8318IBDGST devices share SCLK, SDI, and SDO lines - the SDO of one device connects to the SDI of the next. Each device shifts out its 16-bit result sequentially on a single SDO line, allowing full readout of N devices with only 16×N SCLK cycles and no additional chip selects.
What is the significance of the "IB" suffix in ADS8318IBDGST?
The "IB" suffix denotes the enhanced-grade version of the ADS8318, specifying tighter DC accuracy: ±1.0 LSB maximum integral nonlinearity (INL) and ±0.75 LSB maximum differential nonlinearity (DNL), versus ±1.5 LSB / ±1.0 LSB for the standard "I" grade. This makes ADS8318IBDGST suitable for applications demanding highest static accuracy, such as calibrated test equipment or medical diagnostics.
ADS8318IBDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- 5V
- Voltage - Supply, Digital:
- 2.375V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8318IBDGST FAQ
1.How can I place an order for ADS8318IBDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IBDGST 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 ADS8318IBDGST reliable?
The price and inventory of ADS8318IBDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IBDGST is usually 5 days.
3.What payment methods are accepted for ADS8318IBDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IBDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IBDGST?
ADS8318IBDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IBDGST 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 ADS8318IBDGST?
For technical support, including ADS8318IBDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IBDGST requirements.
6.How does Aetrix verify that ADS8318IBDGST is sourced from the original manufacturer or authorized distributors?
All ADS8318IBDGST 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 ADS8318IBDGST meets industry standards.
7.What is the process for return or replacement of ADS8318IBDGST?
All ADS8318IBDGST units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IBDGST, 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 ADS8318IBDGST part is unused and in its original packaging.
Return procedure for ADS8318IBDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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