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Texas Instruments ADS8318IDRCTG4
- Part No.:
- ADS8318IDRCTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ADS8318IDRCTG4.pdf
- Description:
- IC ADC 16BIT SAR 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
ADS8318IDRCTG4 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. Used in precision battery-powered data acquisition systems requiring high SNR (95.2 dB typ) and low power.
For engineers reviewing the ADS8318IDRCTG4 datasheet, ADS8318IDRCTG4 pinout, ADS8318IDRCTG4 application, or ADS8318IDRCTG4 equivalent, key selection considerations include its 10-pin SON package, ±0.75 LSB max DNL, 1400 ns conversion time, daisy-chain capability, and power-down current of 0.25 µW - all critical for low-noise, space-constrained embedded measurement designs.
Technical Context
The ADS8318IDRCTG4 implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling true zero-latency conversion at 500 kSPS. Its differential input stage accepts common-mode voltage at VREF/2 and supports up to 15 MHz small-signal bandwidth.
Digital interface flexibility includes 3-wire/4-wire CS mode and daisy-chain mode, selectable via SDI logic level at CONVST rising edge. A dedicated busy indicator bit simplifies synchronization with host processors without external timing signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 15.3 ppm full-scale accuracy for high-fidelity sensor digitization |
| Sample Rate | 500 kSPS - enables real-time capture of signals up to 250 kHz Nyquist bandwidth |
| SNR | 95.2 dB typ at 10 kHz - supports >15.5 ENOB for precision instrumentation-grade measurements |
| INL / DNL | ±1.0 LSB max INL, ±0.75 LSB max DNL - ensures monotonicity and minimal code-dependent gain error |
| Power Dissipation | 18 mW typ at 500 kSPS - scales linearly to 3.6 mW/100 kSPS for adaptive power management |
| Power-Down Current | 0.25 µW typ - reduces system standby power in portable medical or IoT edge nodes |
| Reference Range | 2.048 V to 5.5 V - allows direct interfacing with standard voltage references (e.g., REF5025, REF3325) |
Pinout & Package
ADS8318IDRCTG4 is housed in a 10-pin 3 mm × 3 mm SON (Small Outline No-Lead) package with wettable flanks, rated MSL2 per JSTD-020. Thermal impedance θJA = 70 °C/W enables stable operation in compact PCB layouts without heatsinking.
| Pin/Terminal | 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 |
| 2 +VA | Analog supply | 4.5–5.5 V analog power; decoupled to GND for noise-sensitive SAR core operation |
| 3 +IN | Differential analog input (+) | Noninverting input; sampled during acquisition phase; 59 pF input capacitance |
| 4 –IN | Differential analog input (–) | Inverting input; forms differential pair with +IN; common-mode = VREF/2 |
| 5 GND | Common ground | Shared return for +VA and +VBD; critical for minimizing PSRR degradation and digital switching noise coupling |
| 6 CONVST | Conversion start / chip select | Rising edge initiates sampling; doubles as CS in 3-wire mode; controls busy indicator generation |
| 7 SDO | Serial data output | SPI-compatible output; MSB-first; 3-state controlled by CONVST/SCLK edges; supports daisy-chain readout |
| 8 SCLK | Serial clock input | Up to 50 MHz compatible; falling-edge synchronized data output; tclk min = 30 ns (16.7 MHz max) |
| 9 SDI | Serial data input | Mode-select input (CS vs. daisy-chain); also serves as CS in 4-wire mode; sampled at CONVST rising edge |
| 10 +VBD | Digital I/O supply | 2.375–5.5 V; powers digital interface; independent from +VA to isolate noise paths |
Key Features
| Feature | Design Value |
|---|---|
| Zero latency at full speed | Delivers first valid conversion result immediately after tcnv (1400 ns), eliminating pipeline delay in closed-loop control |
| SPI-compatible daisy-chain interface | Enables cascading of multiple ADS8318 devices on single SCLK/SDO/SDI lines - reduces PCB trace count and MCU GPIO usage |
| Unipolar differential input | Supports –VREF to +VREF swing with VCM = VREF/2 - rejects common-mode noise while maximizing dynamic range |
| Automatic power-down | Enters ultra-low-power state (<0.3 µA) between conversions - cuts average power in burst-sampling applications |
| Busy indicator bit | Precedes 16-bit data word when enabled - eliminates need for polling or external ready signals in interrupt-driven firmware |
| Low aperture jitter (6 ps RMS) | Preserves SNR at high input frequencies - critical for accurate spectral analysis in optical networking receivers |
Applications
| Battery-Powered Data Loggers | Medical Patient Monitoring |
|---|---|
|
Use Scenario: Continuous 16-bit recording of ECG, EEG, or temperature sensors in handheld diagnostic tools powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC capturing differential biopotential signals with <1 µV offset drift and 95+ dB SNR at 1–10 kHz. Use Value: 18 mW active power and 0.25 µW power-down current extend battery life beyond 12 months in intermittent-sampling mode. |
Use Scenario: High-fidelity analog front-end in portable ultrasound or infusion pump controllers requiring precise pressure/flow feedback. IC Role / Device Role / Timing Role: Precision digitizer for bridge-based transducers; zero-latency operation ensures real-time closed-loop response. Use Value: ±0.75 LSB DNL and 95.2 dB SNR enable sub-0.1% linearity over full scale - meeting IEC 60601-2-27 clinical accuracy requirements. |
| Industrial Process Control Sensors | Optical Network Transceivers |
|
Use Scenario: Analog monitoring of 4–20 mA loop-powered field instruments (e.g., RTD, strain gauge) in PLC I/O modules. IC Role / Device Role / Timing Role: Isolated ADC interface with differential input rejecting 50/60 Hz mains noise and long-cable pickup. Use Value: 78 dB CMRR and 80 dB PSRR maintain accuracy despite noisy industrial supply rails and shared ground returns. |
Use Scenario: Real-time bias current and temperature monitoring in SFP+/QSFP optical transceivers for laser diode control. IC Role / Device Role / Timing Role: Fast 500-kSPS digitizer feeding DSP-based thermal compensation algorithms with deterministic timing. Use Value: 1400 ns fixed conversion time and busy indicator enable jitter-free synchronization with 125 MHz SerDes clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320IDRCT | 16-bit, 1-MSPS, no daisy-chain support, higher power (30 mW), same 10-pin SON package | Requires faster throughput but lacks flexible interface modes; unsuitable for multi-ADC daisy-chain topologies | Select when sampling rate >500 kSPS is mandatory and board layout cannot accommodate extra CS lines |
| AD7682BRMZ | 16-bit, 250 kSPS, pseudo-differential input (single-ended IN+ with IN– as reference), 10-pin MSOP | Limited to single-ended or pseudo-differential inputs; lower SNR (92.5 dB) and no busy indicator | Choose for cost-sensitive, lower-speed applications where true differential input and zero latency are not required |
Compared with ADS8320IDRCT and AD7682BRMZ, the ADS8318IDRCTG4 uniquely balances 500-kSPS throughput, true differential input, daisy-chain capability, and sub-µW power-down - making it optimal for compact, multi-channel, battery-aware measurement systems.
Availability
ADS8318IDRCTG4 is available at Aetrix Electronics and suitable for battery-powered equipment, medical electronics, industrial process control, and optical networking applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADS8318IDRCTG4 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 expertise in precision data converters and industrial-grade IC design.
The ADS8318IDRCTG4 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and interface-flexible digitization in portable and noise-sensitive measurement systems.
FAQ
What is the maximum external reference voltage supported by the ADS8318IDRCTG4?
The ADS8318IDRCTG4 accepts an external reference voltage from 2.048 V to 5.5 V. Operation above 5.5 V violates absolute maximum ratings and may damage the REFIN pin. At VREF = 5.5 V, full-scale differential input span is ±5.5 V with common-mode at 2.75 V - enabling direct interfacing with industrial ±5 V signal chains.
Does the ADS8318IDRCTG4 require an external clock source for conversion?
No, the ADS8318IDRCTG4 uses an internal oscillator for conversion timing and requires no external clock. The only external clock needed is SCLK for serial data transfer. Conversion time is fixed at 1400 ns (typ) regardless of SCLK frequency, ensuring deterministic latency critical for real-time control loops.
How does the daisy-chain mode function on the ADS8318IDRCTG4?
Daisy-chain mode is selected when SDI is low at the CONVST rising edge. In this mode, multiple ADS8318IDRCTG4 devices share SCLK and SDI lines; SDO of each device connects to SDI of the next. A single 16×N-bit frame reads out N devices sequentially - reducing MCU pin count and PCB routing complexity in multi-channel systems.
What is the purpose of the busy indicator bit in the ADS8318IDRCTG4 serial output?
The busy indicator is a leading logic-low bit preceding the 16-bit conversion result when enabled (via CONVST low at end of conversion). It signals host readiness without polling or timer delays - allowing immediate SCLK initiation upon detection. This eliminates timing uncertainty in interrupt-driven firmware and improves CPU efficiency in resource-constrained microcontrollers.
Can the ADS8318IDRCTG4 operate with separate analog and digital supplies at different voltages?
Yes. ADS8318IDRCTG4 has independent +VA (4.5–5.5 V, analog) and +VBD (2.375–5.5 V, digital I/O) supplies. This allows +VA to be set at 5.0 V for optimal analog performance while +VBD runs at 3.3 V to interface directly with 3.3 V logic families - preventing level-shifter components and simplifying mixed-voltage system design.
ADS8318IDRCTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 10-VFDFN Exposed Pad
- 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-VSON (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8318IDRCTG4 FAQ
1.How can I place an order for ADS8318IDRCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IDRCTG4 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 ADS8318IDRCTG4 reliable?
The price and inventory of ADS8318IDRCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IDRCTG4 is usually 5 days.
3.What payment methods are accepted for ADS8318IDRCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IDRCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IDRCTG4?
ADS8318IDRCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IDRCTG4 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 ADS8318IDRCTG4?
For technical support, including ADS8318IDRCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IDRCTG4 requirements.
6.How does Aetrix verify that ADS8318IDRCTG4 is sourced from the original manufacturer or authorized distributors?
All ADS8318IDRCTG4 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 ADS8318IDRCTG4 meets industry standards.
7.What is the process for return or replacement of ADS8318IDRCTG4?
All ADS8318IDRCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IDRCTG4, 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 ADS8318IDRCTG4 part is unused and in its original packaging.
Return procedure for ADS8318IDRCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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