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Texas Instruments ADS8318IDGST
- Part No.:
- ADS8318IDGST
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8318IDGST.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:837
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Product details
Overview
ADS8318IDGST 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, making it suitable for high-precision, low-power data acquisition in portable instrumentation.
For engineers reviewing the ADS8318IDGST datasheet, ADS8318IDGST pinout, ADS8318IDGST application, or ADS8318IDGST equivalent, key selection considerations include its 10-pin MSOP package, ±1.0 LSB max INL, 95.2 dB SNR at 10 kHz, daisy-chain-capable SPI interface, and power-down current of 0.25 µW - critical for battery-powered and space-constrained embedded systems.
Technical Context
The ADS8318IDGST implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion at 500 kSPS. Its differential input stage supports common-mode voltage at VREF/2 and rejects up to 78 dB of common-mode noise at 500 kHz.
Digital interface flexibility includes 3-wire or 4-wire CS mode and daisy-chain mode, selectable via SDI logic level at CONVST rising edge. A programmable busy indicator bit (prepending 16-bit data) simplifies synchronization with host processors without requiring external timing signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high-fidelity signal digitization in precision measurement. |
| Sample Rate | 500 kSPS - enables real-time capture of bandwidths up to 15 MHz small-signal (-3 dB) without undersampling. |
| INL / DNL | ±1.0 LSB max / ±0.75 LSB max - ensures monotonicity and <0.0015% full-scale linearity error for calibrated sensor interfaces. |
| SNR / THD | 95.2 dB typ / –108 dB typ at 10 kHz - supports >15.5 ENOB for clean spectral analysis in medical and optical applications. |
| Power Dissipation | 18 mW typ at 500 kSPS; scales linearly to 3.6 mW/100 kSPS - allows dynamic power budgeting in variable-rate systems. |
| Power-Down Current | 0.25 µW typ - reduces standby consumption by >70× vs active mode, extending battery life in intermittent-sampling devices. |
| Reference Range | 2.048 V to 5.5 V - accommodates standard precision references (e.g., 2.048 V, 4.096 V) without external scaling. |
Pinout & Package
ADS8318IDGST is housed in a 10-pin MSOP (DGS) package with exposed thermal pad, rated MSL2 per JSTD-020 and optimized for compact PCB layouts in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Reference input | Positive reference voltage terminal; requires 0.1 µF bypass + 10 µF storage capacitor to GND for stable conversion accuracy. |
| 2 +VA | Analog supply | 5 V analog power rail; decoupled to GND to minimize noise coupling into SAR capacitor array. |
| 3 +IN | Differential input (+) | Noninverting analog input; accepts differential swing from –VREF to +VREF with VREF/2 common-mode. |
| 4 –IN | Differential input (–) | Inverting analog input; paired with +IN for rejection of common-mode interference and EMI. |
| 5 GND | Common ground | Shared return path for +VA and +VBD; must be low-impedance to prevent digital switching noise from corrupting analog sampling. |
| 6 CONVST | Conversion start / CS | Rising edge initiates sampling; doubles as chip select in 3-wire mode - enables multi-device sharing of SCLK/SDO lines. |
| 7 SDO | Serial data output | Tri-state SPI output; transmits 16-bit result (or 17-bit with busy indicator) synchronized to SCLK falling edge. |
| 8 SCLK | Serial clock input | Host-provided clock (min 33 MHz) controlling data shift-out timing; independent of internal conversion clock. |
| 9 SDI | Serial data input | Mode-select input: logic level at CONVST rising edge determines CS vs daisy-chain interface configuration. |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V digital rail; powers interface logic and isolates digital switching noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid 16-bit result immediately after tCONV (1400 ns), eliminating pipeline delay in closed-loop control. |
| SPI daisy-chain support | Enables cascading of multiple ADS8318IDGST devices on shared SCLK/SDO/CONVST lines - reduces PCB trace count and controller GPIO usage. |
| Integrated busy indicator | Prepends conversion result with a dedicated status bit, allowing host to poll completion without interrupt or timer overhead. |
| Input leakage & capacitance | 1000 pA max input leakage and 59 pF input capacitance minimize loading on high-impedance sensor sources (e.g., piezoelectric, strain gauge). |
| Power scaling | Consumes 3.6 mW per 100 kSPS - enables adaptive sampling rate control to extend battery life in portable data loggers. |
Applications
| Battery-Powered Instrumentation | Medical Sensor Front-End |
|---|---|
|
Use Scenario: Handheld multimeter acquiring DC voltage, resistance, and temperature with 16-bit resolution and 500 kSPS burst mode. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; zero-latency operation enables real-time display update without buffering delay. Use Value: 18 mW active power and 0.25 µW power-down current extend AA-battery life to >12 months in sleep-wake cycling mode. |
Use Scenario: Portable ECG monitor capturing lead-II differential signals with high CMRR and low THD. IC Role / Device Role / Timing Role: Precision SAR ADC providing 95.2 dB SNR and –108 dB THD at 10 kHz for clean cardiac waveform reconstruction. Use Value: ±1.0 LSB INL ensures accurate amplitude calibration across patient populations; 10-pin MSOP minimizes board area in wearable form factor. |
| Optical Network Monitoring | Industrial Process Control Loop |
|
Use Scenario: Transceiver module monitoring laser bias current and photodiode feedback in DWDM systems. IC Role / Device Role / Timing Role: High-speed ADC sampling analog monitor channels at 500 kSPS to detect rapid fault conditions (e.g., TEC failure, fiber disconnect). Use Value: Daisy-chain capability allows single FPGA SPI port to monitor 4+ transceivers, reducing FPGA pin count and interconnect complexity. |
Use Scenario: PLC analog input module digitizing 4–20 mA loop signals with galvanic isolation and cold-junction compensation. IC Role / Device Role / Timing Role: Isolated-side ADC interfacing to isolated Σ-Δ modulator outputs via 3-wire CS mode - eliminates need for isolated SPI clock domain crossing. Use Value: 78 dB CMRR rejects common-mode noise from motor drives and VFDs; 2.048–5.5 V reference range matches industrial reference ICs (e.g., REF5025). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDRCT | 16-bit, 1-MSPS, 10-pin SON package; higher speed but 22 mW active power and no daisy-chain mode. | Requires faster host interface and lacks busy indicator - increases firmware complexity for synchronization. | Choose when throughput >500 kSPS is mandatory and power budget allows +22% increase; not drop-in due to different timing and interface features. |
| AD7682BRMZ | 16-bit, 250 kSPS, 10-pin MSOP; lower speed but ±0.5 LSB INL and integrated reference buffer. | Cannot support 500 kSPS sampling; better linearity but lacks daisy-chain and busy indicator functionality. | Choose for ultra-high linearity-critical applications (e.g., metrology) where 250 kSPS suffices and reference buffering simplifies design. |
Compared with ADS8318IDGST, ADS8320IDRCT trades power efficiency and interface flexibility for raw speed, while AD7682BRMZ prioritizes static accuracy over dynamic features - making ADS8318IDGST optimal for balanced performance in portable, multi-channel, and battery-sensitive systems.
Availability
ADS8318IDGST is available at Aetrix Electronics and suitable for battery-powered equipment, medical electronics, optical networking, and industrial process control requiring stable component supply and long-term manufacturability.
Supply support for ADS8318IDGST 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 ADS8318IDGST belongs to TI's precision SAR ADC product line, designed specifically for high-resolution, low-power, and space-constrained applications including portable instrumentation, medical sensors, and industrial monitoring.
FAQ
What is the maximum sampling rate supported by the ADS8318IDGST?
The ADS8318IDGST supports a maximum throughput rate of 500 kSPS with zero latency at full speed. Its fixed internal conversion time is 1400 ns, and minimum cycle time between conversions is 2000 ns - enabling deterministic timing for real-time control loops and burst-mode acquisition without pipeline stalls.
Does the ADS8318IDGST require an external reference, and what voltage range is supported?
Yes, the ADS8318IDGST requires an external reference applied to the REFIN pin. It supports reference voltages from 2.048 V to 5.5 V, accommodating standard precision references such as 2.048 V (for 16-bit integer scaling) and 4.096 V (for 12-bit compatibility). Reference input current is 250 µA typical during conversion.
How does the daisy-chain interface mode work on the ADS8318IDGST?
The ADS8318IDGST enters daisy-chain mode when SDI is low at the rising edge of CONVST. In this mode, multiple devices share SCLK and CONVST lines, with SDO of one device connected to SDI of the next. Each device shifts out its 16-bit result sequentially on a single SDO line, reducing host interface complexity and PCB routing.
What is the significance of the busy indicator feature in the ADS8318IDGST?
The busy indicator is a prepended status bit (low = busy, high = ready) transmitted before the 16-bit conversion result. It allows the host processor to determine conversion completion without polling CONVST state or using interrupts - simplifying firmware design and improving timing predictability in multi-tasking environments.
Can the ADS8318IDGST operate from a single 3.3-V supply?
Yes, the ADS8318IDGST supports dual supplies: +VA (analog) from 4.5 V to 5.5 V and +VBD (digital I/O) from 2.375 V to 5.5 V. While +VA requires ≥4.5 V, +VBD can be independently set to 3.3 V - enabling direct interfacing with 3.3-V microcontrollers and FPGAs without level-shifting circuitry.
ADS8318IDGST 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:
- -
ADS8318IDGST FAQ
1.How can I place an order for ADS8318IDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IDGST 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 ADS8318IDGST reliable?
The price and inventory of ADS8318IDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IDGST is usually 5 days.
3.What payment methods are accepted for ADS8318IDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IDGST?
ADS8318IDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IDGST 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 ADS8318IDGST?
For technical support, including ADS8318IDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IDGST requirements.
6.How does Aetrix verify that ADS8318IDGST is sourced from the original manufacturer or authorized distributors?
All ADS8318IDGST 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 ADS8318IDGST meets industry standards.
7.What is the process for return or replacement of ADS8318IDGST?
All ADS8318IDGST units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IDGST, 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 ADS8318IDGST part is unused and in its original packaging.
Return procedure for ADS8318IDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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