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Texas Instruments ADS8318IBDGSTG4
- Part No.:
- ADS8318IBDGSTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8318IBDGSTG4.pdf
- Description:
- IC ADC 16BIT SAR 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
ADS8318IBDGSTG4 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, zero-latency operation, ±1.0 LSB max INL, and 95.2 dB SNR at 10 kHz - deployed in precision data acquisition systems requiring low power and high DC/AC accuracy.
For engineers reviewing the ADS8318IBDGSTG4 datasheet, ADS8318IBDGSTG4 pinout, ADS8318IBDGSTG4 application, or ADS8318IBDGSTG4 equivalent, key selection considerations include its 10-pin MSOP package, 2.048–5.5 V reference input range, 18 mW typical power dissipation at full speed, daisy-chain capability, and guaranteed no missing codes over 16 bits.
Technical Context
The ADS8318IBDGSTG4 implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion at 500 kSPS. Its internal conversion clock eliminates external timing dependencies, and acquisition time is fixed at 600 ns with 1400 ns conversion time.
Digital interface supports four SPI modes: 3-wire/4-wire CS mode with or without busy indicator, plus daisy-chain configuration. Input common-mode voltage is fixed at +Vref/2, and reference input current is 250 µA during conversion - requiring stable external reference decoupling per datasheet layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees 1:65,536 dynamic range for high-precision sensor or instrumentation digitization. |
| Sample Rate | 500 kSPS - enables real-time capture of signals up to 15 MHz small-signal bandwidth with 16-bit fidelity. |
| INL / DNL | ±1.0 LSB max / ±0.75 LSB max - ensures monotonicity and <0.0015% full-scale linearity error for calibration-critical applications. |
| SNR / THD | 95.2 dB typ / –108 dB typ at 10 kHz - delivers >15.5 ENOB for high-fidelity signal reconstruction in medical or optical systems. |
| Power Dissipation | 18 mW typ at 500 kSPS; scales linearly to 3.6 mW/100 kSPS - allows dynamic power management in battery-powered designs. |
| Reference Range | 2.048 V to 5.5 V - supports direct interfacing with standard voltage references (e.g., REF5025, REF5045) without scaling circuitry. |
| Power-Down Current | 0.25 µW typ - reduces standby consumption to sub-microwatt levels during idle intervals in intermittent-sampling systems. |
Pinout & Package
ADS8318IBDGSTG4 is housed in a 10-pin MSOP (DGS) package with exposed thermal pad, rated MSL2 260°C, and optimized for compact PCB layouts with minimal analog/digital coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REFIN | Reference input | Positive reference voltage input; requires 0.1 µF bypass + 10 µF storage capacitor to GND for noise immunity and transient stability. |
| 2 +VA | Analog supply | 4.5–5.5 V analog power rail; must be decoupled to GND with low-ESR ceramic capacitor to maintain SNR performance. |
| 3 +IN | Analog input (+) | Noninverting differential input; 59 pF input capacitance and 1 nA leakage require careful driver selection and layout isolation. |
| 4 –IN | Analog input (–) | Inverting differential input; common-mode voltage fixed at +Vref/2 - mandates matched source impedance for optimal CMRR (78 dB). |
| 5 GND | Common ground | Shared return for +VA and +VBD; critical star-point connection to minimize digital switching noise coupling into analog path. |
| 6 CONVST | Conversion start / CS | Rising edge initiates sampling; level at end of conversion selects interface mode (busy indicator enabled if low). |
| 7 SDO | Serial data output | SPI-compatible output; tri-state controlled by CONVST/SCLK edges - supports daisy-chaining without external logic. |
| 8 SCLK | Serial clock input | Up to 50 MHz clock; timing-critical for data validity windows (t2 = 5 ns, t3 = 16–24 ns) - requires controlled-impedance trace routing. |
| 9 SDI | Serial data input | Mode-select input sampled on CONVST rising edge; determines CS vs. daisy-chain operation - tied high for default CS mode. |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V digital rail; independent of +VA - enables mixed-voltage system interfacing (e.g., 3.3 V host with 5 V analog section). |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid result immediately after conversion completes - eliminates pipeline delay in closed-loop control systems. |
| SPI-compatible daisy-chain support | Enables cascading of multiple ADS8318 devices using single SCLK/SDO/SDI lines - reduces FPGA I/O count and PCB routing complexity. |
| Unipolar differential input | Accepts –Vref to +Vref swing with +Vref/2 common-mode - simplifies front-end design versus pseudo-differential or single-ended ADCs. |
| Automatic power-down | Enters ultra-low-power state (0.25 µW) between conversions - ideal for duty-cycled sensing in portable instrumentation. |
| No missing codes guarantee | Ensures monotonic 16-bit transfer function across full temperature range (–40°C to +85°C) - critical for position/safety-critical decoding. |
Applications
| Battery-Powered Data Loggers | Precision Process Monitoring |
|---|---|
Use Scenario: Continuous 16-bit voltage/current logging in remote environmental sensors powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC capturing transducer outputs at 100–500 kSPS with autonomous power cycling between samples. Use Value: 3.6 mW/100 kSPS scaling and 0.25 µW power-down enable multi-year operation on a single charge. | Use Scenario: Real-time monitoring of pressure, flow, and temperature in industrial PLC analog input modules. IC Role / Device Role / Timing Role: High-accuracy front-end digitizer with daisy-chain capability for multi-channel synchronized acquisition. Use Value: ±0.75 LSB DNL and 95.2 dB SNR ensure compliance with IEC 61000-4-30 Class A power quality standards. |
| Medical Patient Monitoring | Optical Network Diagnostics |
Use Scenario: ECG/EEG signal conditioning in portable diagnostic devices requiring low-noise, low-power, and high-linearity digitization. IC Role / Device Role / Timing Role: Differential input ADC rejecting common-mode interference from body-coupled noise sources. Use Value: 78 dB CMRR and 15 MHz small-signal bandwidth preserve waveform fidelity for clinical-grade interpretation. | Use Scenario: Laser bias current and photodiode feedback monitoring in DWDM transceivers with tight thermal constraints. IC Role / Device Role / Timing Role: Precision current/voltage measurement ADC operating in thermally isolated zones with minimal self-heating. Use Value: ±1.0 LSB INL and 0.003% gain error stability over temperature reduce calibration frequency in field-deployed optics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IBDGST | 16-bit, 1-MSPS, wider 2.7–5.5 V supply range, higher 25 mW power at full speed, same 10-pin MSOP package. | Higher throughput suitable for faster control loops but trades off power efficiency and thermal footprint. | Select when sampling rate >500 kSPS is required and board-level power budget permits 39% higher dissipation. |
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, ±0.5 LSB INL, SPI interface, 10-lead LFCSP package, requires external reference, lower 12 mW power at 250 kSPS. | Lower speed and tighter INL ideal for static or slow-varying measurements where ultimate linearity outweighs speed. | Select for ultra-high DC accuracy applications (e.g., weigh scales) where 250 kSPS suffices and 0.5 LSB INL is mandatory. |
Compared with ADS8320IBDGST and AD7682BCPZ-RL7, the ADS8318IBDGSTG4 uniquely balances 500-kSPS throughput, 18-mW efficiency, and ±1.0-LSB INL in a thermally robust MSOP package - making it optimal for portable, battery-constrained, medium-speed precision systems.
Availability
ADS8318IBDGSTG4 is available at Aetrix Electronics and suitable for battery-powered equipment, instrumentation and process control, medical electronics, and optical networking requiring stable component supply and long-term production continuity.
Supply support for ADS8318IBDGSTG4 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, embedded processing, and connectivity technologies with decades of precision data converter innovation.
The ADS8318IBDGSTG4 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and low-latency digitization in portable and industrial measurement systems.
FAQ
What is the maximum reference voltage supported by the ADS8318IBDGSTG4?
The ADS8318IBDGSTG4 supports an external reference voltage range of 2.048 V to 5.5 V, with typical performance characterized at 4 V and 5 V. Operation above 5.5 V violates absolute maximum ratings and may cause permanent damage. The device's reference input current is 250 µA during conversion, so the reference source must sustain this load without droop or noise degradation - verified in the SLAS568A datasheet Section 6.5.
Does the ADS8318IBDGSTG4 require an external clock source for conversion?
No, the ADS8318IBDGSTG4 uses an internal clock for SAR conversion and does not require an external clock input. Conversion time is fixed at 1400 ns regardless of SCLK frequency, enabling deterministic timing for real-time systems. The SCLK is used only for serial data readout after conversion completion - confirmed in the "Detailed Descriptions" section of the SLAS568A datasheet.
Can the ADS8318IBDGSTG4 operate with separate analog and digital supply voltages?
Yes, the ADS8318IBDGSTG4 features independent analog (+VA) and digital I/O (+VBD) supplies: +VA accepts 4.5–5.5 V for the analog core, while +VBD supports 2.375–5.5 V for the SPI interface. This separation allows interfacing with 3.3 V microcontrollers while maintaining 5 V analog performance - detailed in Section 6.3 (Power Supply Requirements) of the SLAS568A datasheet.
How does the busy indicator function on the ADS8318IBDGSTG4 work?
The busy indicator on the ADS8318IBDGSTG4 is a leading low-level bit output on SDO immediately after conversion completes - activated only when CONVST remains low at conversion end. It signals host readiness to read data without polling or fixed delays. In 3-wire CS mode with busy indicator, 17 SCLK edges are required to shift out the busy bit plus 16 data bits - as shown in Figure 48 of the SLAS568A datasheet.
Is the ADS8318IBDGSTG4 pin-compatible with other devices in the ADS8318 family?
Yes, all ADS8318 variants - including ADS8318IDGST, ADS8318IBDGST, ADS8318IDRCT, and ADS8318IBDRCT - share identical 10-pin MSOP (DGS) and SON (DRC) footprints and pinouts. The suffix 'IB' denotes improved linearity (±1.0 LSB INL vs. ±1.5 LSB for 'I' grade), but mechanical and electrical interface compatibility is maintained across the family per the Ordering Information table in SLAS568A.
ADS8318IBDGSTG4 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:
- -
ADS8318IBDGSTG4 FAQ
1.How can I place an order for ADS8318IBDGSTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IBDGSTG4 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 ADS8318IBDGSTG4 reliable?
The price and inventory of ADS8318IBDGSTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IBDGSTG4 is usually 5 days.
3.What payment methods are accepted for ADS8318IBDGSTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IBDGSTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IBDGSTG4?
ADS8318IBDGSTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IBDGSTG4 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 ADS8318IBDGSTG4?
For technical support, including ADS8318IBDGSTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IBDGSTG4 requirements.
6.How does Aetrix verify that ADS8318IBDGSTG4 is sourced from the original manufacturer or authorized distributors?
All ADS8318IBDGSTG4 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 ADS8318IBDGSTG4 meets industry standards.
7.What is the process for return or replacement of ADS8318IBDGSTG4?
All ADS8318IBDGSTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IBDGSTG4, 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 ADS8318IBDGSTG4 part is unused and in its original packaging.
Return procedure for ADS8318IBDGSTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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