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Texas Instruments ADS8318IDGSTG4
- Part No.:
- ADS8318IDGSTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8318IDGSTG4.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
ADS8318IDGSTG4 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 18 mW typical at 500 kSPS, making it suitable for precision data acquisition in battery-powered instrumentation.
For engineers reviewing the ADS8318IDGSTG4 datasheet, ADS8318IDGSTG4 pinout, ADS8318IDGSTG4 application, or ADS8318IDGSTG4 equivalent, key selection criteria include its ±1.0 LSB max INL, 95.2 dB SNR at 10 kHz, daisy-chain-capable SPI interface, 10-pin MSOP package, and power-down current of 0.25 µW - all critical for low-noise, space-constrained embedded measurement systems.
Technical Context
The ADS8318IDGSTG4 employs a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion at 500 kSPS. Its internal clock drives fixed 1400 ns conversion time independent of external timing, while acquisition completes in 600 ns - ensuring deterministic throughput without pipeline delay.
It supports two primary interface modes: CS mode (3- or 4-wire) and daisy-chain mode, selected dynamically via SDI level at CONVST rising edge. The device outputs 16-bit data synchronously with SCLK falling edges and optionally precedes it with a busy indicator bit, simplifying host synchronization in multi-device systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 part-in-65,536 quantization granularity for high-fidelity sensor signal digitization. |
| Sample Rate | 500 kSPS - enables real-time capture of signals up to 250 kHz Nyquist bandwidth with no missing codes. |
| INL / DNL | ±1.0 LSB max / ±0.75 LSB max - ensures monotonicity and <0.0015% full-scale linearity error in closed-loop control feedback paths. |
| SNR @ 10 kHz | 95.2 dB typ - corresponds to ~15.8 effective bits, supporting sub-millivolt resolution in 4-V reference systems. |
| Power Dissipation | 18 mW typ at 500 kSPS - scales linearly to 3.6 mW/100 kSPS, enabling dynamic power adjustment in duty-cycled sensing nodes. |
| Power-Down Current | 0.25 µW typ - reduces standby consumption by >70,000× vs active mode, critical for multi-year battery life in IoT endpoints. |
| Reference Range | 2.048 V to 5.5 V - allows direct interfacing with standard voltage references (e.g., REF5025, REF3325) without scaling amplifiers. |
Pinout & Package
ADS8318IDGSTG4 is housed in a 10-pin MSOP (DGS) package with 0.5-mm pitch, optimized for compact PCB layouts and thermal performance (θJA = 180°C/W). Pin functions are validated per TI SLAS568A datasheet Figure 1 and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Reference input | Positive reference terminal; requires 0.1-μF bypass + 10-μF storage capacitor to maintain stability during conversion. |
| 2 +VA | Analog supply | 5-V analog power rail; must be decoupled to GND to minimize noise coupling into SAR capacitor array. |
| 3 +IN | Differential input (+) | Noninverting analog input; accepts common-mode voltage at VREF/2 for unipolar differential operation. |
| 4 –IN | Differential input (–) | Inverting analog input; forms differential pair with +IN, supporting full-scale swing of –VREF to +VREF. |
| 5 GND | Common ground | Shared return path for +VA and +VBD supplies; critical for minimizing PSRR degradation and offset drift. |
| 6 CONVST | Conversion start / CS | Rising edge initiates sampling; doubles as chip select in 3-wire mode, enabling galvanic isolation in multi-ADC systems. |
| 7 SDO | Serial data output | 3-state SPI output; drives MSB first on SCLK falling edges; asserts busy bit when CONVST remains low post-conversion. |
| 8 SCLK | Serial clock input | Host-provided clock (min 20 ns period); synchronizes all data transfers and determines maximum achievable throughput. |
| 9 SDI | Serial data input | Mode-select input; logic level at CONVST rising edge configures CS vs daisy-chain and busy/no-busy operation. |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V digital rail; powers interface logic independently from +VA, allowing mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers completed 16-bit result immediately after fixed 1400 ns conversion time - eliminates pipeline delay in real-time control loops. |
| SPI daisy-chain support | Enables cascading of multiple ADS8318 devices using single SCLK/SDI/SDO lines - reduces PCB trace count and FPGA pin usage by >60%. |
| Dynamic power scaling | Consumes 3.6 mW per 100 kSPS - allows firmware-controlled sample rate reduction to extend battery life without hardware changes. |
| Integrated busy indicator | Optional pre-data status bit signals conversion completion - eliminates polling or timer-based host synchronization overhead. |
| Unipolar differential input | Accepts –VREF to +VREF differential swing with VREF/2 common-mode - simplifies front-end design for bridge sensors and isolated amplifiers. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Digitizing ECG/EEG electrode signals in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC capturing 1–250 Hz biopotential waveforms with 16-bit fidelity and minimal self-heating. Use Value: 95.2 dB SNR and ±1.0 LSB INL preserve diagnostic waveform integrity; 0.25 µW power-down current extends runtime between charges. |
Use Scenario: High-accuracy temperature and pressure readings in distributed PLC I/O modules. IC Role / Device Role / Timing Role: Precision front-end ADC for 4–20 mA loop receivers and RTD/thermocouple signal conditioning. Use Value: ±0.75 LSB DNL guarantees monotonic response across 0–100°C industrial range; daisy-chain mode reduces backplane wiring complexity. |
| Optical Network Transceivers | Battery-Powered Test Equipment |
|
Use Scenario: Real-time monitoring of laser bias current and TEC voltage in SFP+ optical modules. IC Role / Device Role / Timing Role: Fast-sampling ADC for closed-loop power control with sub-µs latency requirements. Use Value: Zero-latency 500 kSPS operation enables immediate correction of laser drift; 10-pin MSOP fits tight 25G transceiver form factors. |
Use Scenario: Portable multimeters and oscilloscope probes requiring calibrated DC/AC measurements. IC Role / Device Role / Timing Role: Core metrology ADC providing traceable 16-bit readings with low THD (–108 dB at 10 kHz). Use Value: 95.2 dB SNR and –108 dB THD meet Class I handheld instrument accuracy standards; 2.048–5.5 V reference flexibility supports dual-range designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit, 1-MSPS, 28-pin TSSOP; higher speed but larger footprint and 35 mW active power. | Requires more PCB area and thermal management; suited for benchtop instruments over portable units. | Select when >500 kSPS throughput is mandatory and board space permits larger package. |
| AD7682BCPZ | 16-bit, 250 kSPS, 20-pin LFCSP; lower power (12 mW) but slower and no daisy-chain mode. | Lacks SPI daisy-chain capability; requires individual CS lines for multi-ADC systems. | Choose for ultra-low-power, single-channel applications where interface simplicity outweighs throughput needs. |
Compared with ADS8318IDGSTG4, ADS8325IPW trades packaging efficiency and power for raw speed, while AD7682BCPZ sacrifices interface flexibility and sample rate for lower quiescent consumption - making ADS8318IDGSTG4 optimal for space-constrained, multi-node, battery-operated precision acquisition.
Availability
ADS8318IDGSTG4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, optical network transceivers, and battery-powered test equipment requiring stable component supply and long-term manufacturability.
Supply support for ADS8318IDGSTG4 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 ADS8318 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-latency digitization in resource-constrained environments such as portable instrumentation and distributed sensing nodes.
FAQ
What is the maximum sampling frequency supported by the ADS8318IDGSTG4?
The ADS8318IDGSTG4 supports a maximum throughput rate of 500 kSPS with zero latency at full speed. Its fixed 1400 ns conversion time and 600 ns acquisition time enable deterministic operation at this rate, and timing parameters are guaranteed across the full –40°C to +85°C operating temperature range per the SLAS568A datasheet.
Does the ADS8318IDGSTG4 require an external clock source for conversion?
No, the ADS8318IDGSTG4 uses an internal clock for the SAR conversion process, eliminating the need for an external conversion clock. The external SCLK is used only for serial data transfer - not for controlling conversion timing - which simplifies system timing design and improves jitter immunity in noisy environments.
Can the ADS8318IDGSTG4 interface with a 3.3-V microcontroller while powered from a 5-V analog supply?
Yes, the ADS8318IDGSTG4 supports independent analog (+VA) and digital I/O (+VBD) supplies. It can operate with +VA = 5 V for optimal analog performance while +VBD = 3.3 V interfaces directly with 3.3-V logic families, meeting VIH/VIL thresholds per the datasheet's CMOS logic level specifications.
How does the daisy-chain mode function on the ADS8318IDGSTG4?
Daisy-chain mode is enabled when SDI is low at the CONVST rising edge. In this mode, multiple ADS8318IDGSTG4 devices share SCLK, SDI, and SDO lines; each device shifts its 16-bit result into the next, allowing full readout of N devices with 16×N SCLK cycles - reducing GPIO count and PCB routing complexity in multi-channel systems.
What is the significance of the busy indicator feature in ADS8318IDGSTG4 applications?
The busy indicator is a configurable pre-data bit output on SDO that signals conversion completion. When enabled (via low CONVST at end of conversion), it eliminates the need for host-side polling or precise timing calculations - enabling simpler, more robust firmware for real-time systems like motor controllers or medical alarms where deterministic latency is critical.
ADS8318IDGSTG4 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:
- Discontinued at Digi-Key
- 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:
- -
ADS8318IDGSTG4 FAQ
1.How can I place an order for ADS8318IDGSTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IDGSTG4 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 ADS8318IDGSTG4 reliable?
The price and inventory of ADS8318IDGSTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IDGSTG4 is usually 5 days.
3.What payment methods are accepted for ADS8318IDGSTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IDGSTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IDGSTG4?
ADS8318IDGSTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IDGSTG4 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 ADS8318IDGSTG4?
For technical support, including ADS8318IDGSTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IDGSTG4 requirements.
6.How does Aetrix verify that ADS8318IDGSTG4 is sourced from the original manufacturer or authorized distributors?
All ADS8318IDGSTG4 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 ADS8318IDGSTG4 meets industry standards.
7.What is the process for return or replacement of ADS8318IDGSTG4?
All ADS8318IDGSTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IDGSTG4, 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 ADS8318IDGSTG4 part is unused and in its original packaging.
Return procedure for ADS8318IDGSTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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