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Texas Instruments ADS8318IBDGSR
- Part No.:
- ADS8318IBDGSR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8318IBDGSR.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,893
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Product details
Overview
ADS8318IBDGSR from Texas Instruments is a 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with unipolar differential input range (–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 only 18 mW typical at 500 kSPS, making it suitable for precision data acquisition in battery-powered instrumentation.
For engineers reviewing the ADS8318IBDGSR datasheet, ADS8318IBDGSR pinout, ADS8318IBDGSR application, or ADS8318IBDGSR equivalent, key selection criteria include its ±1.0 LSB max INL, ±0.75 LSB max DNL, 95.2 dB SNR at 10 kHz, daisy-chain capability, and MSOP-10 package compatibility with space-constrained industrial sensor interfaces.
Technical Context
The ADS8318IBDGSR implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion - output data is valid immediately after conversion completes without pipeline delay. Its internal charge redistribution circuitry isolates +IN/–IN during conversion, ensuring high common-mode rejection (78 dB) and low input leakage (1000 pA).
Digital interfacing supports dual operational modes: CS mode (3- or 4-wire) and daisy-chain mode, selectable via SDI logic level at CONVST rising edge. The device automatically enters power-down between conversions, achieving 0.25 µW typical standby dissipation, with timing fully specified for SCLK periods down to 20 ns and acquisition time of 600 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 part-in-65,536 quantization granularity for high-fidelity signal digitization. |
| Sample Rate | 500 kSPS - supports real-time capture of signals up to 15 MHz small-signal bandwidth with no missing codes. |
| INL / DNL | ±1.0 LSB max / ±0.75 LSB max - ensures monotonicity and accurate end-point linearity for closed-loop control feedback. |
| SNR @ 10 kHz | 95.2 dB typical - enables >15.5 effective number of bits (ENOB) in medium-frequency measurement applications. |
| Power Dissipation | 18 mW typical at 500 kSPS - scales linearly to 3.6 mW/100 kSPS, allowing dynamic power optimization in variable-rate systems. |
| Reference Range | 2.048 V to 5.5 V - accommodates standard voltage references (e.g., 2.048 V, 4.096 V) without external scaling. |
| Power-Down Current | 50 nA typical - reduces system quiescent load during idle intervals in energy-sensitive portable designs. |
Pinout & Package
ADS8318IBDGSR is housed in a 10-pin MSOP (DGS) package with exposed thermal pad, rated MSL2 per JSTD-020 and optimized for low parasitic layout in precision analog front-ends.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Reference input | Accepts external reference voltage (2.048–5.5 V); requires 0.1 µF bypass + 10 µF storage capacitor to GND for stability. |
| 2 +VA | Analog supply | 4.5–5.5 V analog rail; decoupled to GND to minimize noise coupling into SAR core. |
| 3 +IN | Differential analog input (+) | Noninverting input; forms differential pair with –IN; common-mode bias = VREF/2. |
| 4 –IN | Differential analog input (–) | Inverting input; supports unipolar differential swing from –VREF to +VREF. |
| 5 GND | Common ground | Shared return for +VA and +VBD; critical for minimizing PSRR degradation and digital switching noise injection. |
| 6 CONVST | Conversion start / chip select | Rising edge initiates sampling; doubles as CS in 3-wire mode; timing-critical for synchronization. |
| 7 SDO | Serial data output | SPI-compatible output; tri-state controlled by CONVST/SCLK; supports busy indicator bit when enabled. |
| 8 SCLK | Serial clock input | Accepts up to 50 MHz clock; falling-edge synchronized data output; min pulse width 8 ns. |
| 9 SDI | Serial data input | Mode-select input (CS vs daisy-chain); sampled at CONVST rising edge; also serves as CS in 4-wire mode. |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V digital rail; independent from +VA to isolate logic noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid output code immediately after tCONV (1400 ns), eliminating pipeline delay in real-time control loops. |
| Daisy-chain SPI interface | Enables cascading of multiple ADS8318 devices on single SCLK/SDO/SDI lines - reduces PCB trace count and controller GPIO usage. |
| Auto power-down between conversions | Reduces average current to ~50 nA during acquisition phase, extending battery life in intermittent-sampling applications. |
| Unipolar differential input | Supports –VREF to +VREF differential swing with VREF/2 common-mode - simplifies driver design versus pseudo-differential architectures. |
| Busy indicator option | Prepends a status bit to 16-bit output stream, allowing host processor to poll completion without fixed timing delays or interrupts. |
| Low input capacitance (59 pF) | Minimizes settling burden on preceding amplifier stage, enabling use with high-output-impedance sensors or passive filters. |
Applications
| Portable Data Loggers | Industrial Process Sensors |
|---|---|
Use Scenario: Battery-powered environmental monitoring node acquiring temperature, pressure, and humidity over extended field deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from precision transducers; synchronized via microcontroller's CONVST trigger. Use Value: 18 mW active power and 0.25 µW power-down dissipation extend operational life; ±0.75 LSB DNL ensures repeatability across thermal cycles. |
Use Scenario: DIN-rail mounted PLC analog input module measuring 4–20 mA loop signals with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated voltage outputs from current-sense amplifiers; interfaced in 4-wire CS mode for deterministic timing. Use Value: 78 dB CMRR rejects common-mode noise from motor drives; 95.2 dB SNR preserves resolution in electrically noisy factory environments. |
| Medical Patient Monitors | Optical Network Diagnostics |
Use Scenario: Compact ECG front-end capturing biopotential signals with high common-mode interference rejection. IC Role / Device Role / Timing Role: Differential ADC sampling amplified lead-II signals; uses daisy-chain mode to multiplex multiple channels with single SPI bus. Use Value: Zero-latency operation enables real-time R-wave detection; ±1.0 LSB INL maintains diagnostic accuracy across patient populations. |
Use Scenario: Optical transceiver module monitoring laser bias current and photodiode feedback in 10G/25G coherent systems. IC Role / Device Role / Timing Role: High-speed ADC digitizing analog monitor outputs for closed-loop laser power control; driven by FPGA SCLK at 50 MHz. Use Value: 15 MHz small-signal bandwidth captures fast transients; 1400 ns conversion time supports tight control loop timing budgets. |
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, SON-10 package; higher speed but 2× power (36 mW); no daisy-chain mode; ±1.5 LSB INL. | Better suited for high-throughput streaming where latency tolerance exists; lacks flexible interface options of ADS8318IBDGSR. | Select when sampling rate >500 kSPS is mandatory and board space allows SON-10; avoid if daisy-chain or ultra-low-power sleep is required. |
| AD7682BRMZ | 16-bit, 250 kSPS, MSOP-10; SPI-only (no daisy-chain); ±1.0 LSB INL; 12.5 mW at 250 kSPS; requires external reference. | Lower power at reduced speed; simpler interface but no busy indicator or mode flexibility; tighter THD (–110 dB). | Choose for cost-sensitive, lower-speed applications where interface simplicity outweighs feature richness; verify reference sourcing capability. |
Compared with ADS8318IBDGSR, ADS8320IDRCT trades interface flexibility and ultra-low power for raw speed, while AD7682BRMZ offers lower static power at half the throughput and minimal feature set - making ADS8318IBDGSR optimal for balanced performance, power, and configurability in compact industrial nodes.
Availability
ADS8318IBDGSR is available at Aetrix Electronics and suitable for portable instrumentation, industrial process sensors, medical diagnostics, and optical network monitoring requiring stable component supply and long-term manufacturability.
Supply support for ADS8318IBDGSR 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 signal chain solutions.
The ADS8318IBDGSR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-noise, and low-power digitization in space- and energy-constrained applications such as portable test equipment and distributed sensor networks.
FAQ
What is the maximum recommended reference voltage for ADS8318IBDGSR?
The ADS8318IBDGSR supports an external reference input range of 2.048 V to 5.5 V. The absolute maximum rating for REFIN is +VA + 0.3 V, and +VA must be ≤5.5 V. Therefore, the practical upper limit is 5.5 V - exceeding this risks damage or specification violation. TI specifies performance metrics (e.g., SNR, INL) up to 5.5 V reference, confirming full compliance within that bound. Always decouple REFIN with 0.1 µF ceramic + 10 µF bulk capacitors to GND.
Does ADS8318IBDGSR require an external clock source for conversion?
No, ADS8318IBDGSR does not require an external clock for the conversion process. It uses an internal precision oscillator to execute the SAR algorithm, completing conversion in a fixed 1400 ns (typical) regardless of SCLK frequency. The external SCLK is used solely for serial data readout - not for controlling conversion timing. This eliminates clock jitter sensitivity in the analog path and simplifies system-level timing design.
Can ADS8318IBDGSR operate with separate analog and digital supplies at different voltages?
Yes, ADS8318IBDGSR supports independent analog (+VA) and digital I/O (+VBD) supplies. +VA ranges from 4.5 V to 5.5 V, while +VBD accepts 2.375 V to 5.5 V - enabling mixed-voltage systems (e.g., +VA = 5 V, +VBD = 3.3 V). Both supplies share GND, and proper decoupling of each to GND is mandatory to maintain PSRR (80 dB) and prevent digital noise from modulating the analog conversion result.
How does the daisy-chain mode function on ADS8318IBDGSR?
Daisy-chain mode on ADS8318IBDGSR is enabled when SDI is low at the CONVST rising edge. In this mode, multiple ADS8318 devices are connected serially: SDO of Device N connects to SDI of Device N+1. A single SCLK clocks all devices, and 16-bit outputs cascade through the chain - e.g., 4 devices yield 64-bit frame. No additional chip select lines are needed, reducing routing complexity and controller pin count in multi-channel systems.
What is the significance of the "B" grade in ADS8318IBDGSR?
"B" denotes the enhanced performance grade of the ADS8318 family: ADS8318IBDGSR guarantees ±1.0 LSB maximum integral nonlinearity (INL) and ±0.75 LSB maximum differential nonlinearity (DNL), versus ±1.5/±1.0 LSB for the standard "I" grade (ADS8318IDGST). This tighter linearity directly improves measurement accuracy in closed-loop control and calibration-critical applications, with no trade-off in speed, power, or package.
ADS8318IBDGSR 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:
- -
ADS8318IBDGSR FAQ
1.How can I place an order for ADS8318IBDGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IBDGSR 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 ADS8318IBDGSR reliable?
The price and inventory of ADS8318IBDGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IBDGSR is usually 5 days.
3.What payment methods are accepted for ADS8318IBDGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IBDGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IBDGSR?
ADS8318IBDGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IBDGSR 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 ADS8318IBDGSR?
For technical support, including ADS8318IBDGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IBDGSR requirements.
6.How does Aetrix verify that ADS8318IBDGSR is sourced from the original manufacturer or authorized distributors?
All ADS8318IBDGSR 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 ADS8318IBDGSR meets industry standards.
7.What is the process for return or replacement of ADS8318IBDGSR?
All ADS8318IBDGSR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IBDGSR, 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 ADS8318IBDGSR part is unused and in its original packaging.
Return procedure for ADS8318IBDGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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