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Texas Instruments ADS8318IDRCT
- Part No.:
- ADS8318IDRCT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ADS8318IDRCT.pdf
- Description:
- IC ADC 16BIT SAR 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
ADS8318IDRCT 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, targeting precision data acquisition in battery-powered instrumentation.
For engineers reviewing the ADS8318IDRCT datasheet, ADS8318IDRCT pinout, ADS8318IDRCT application, or ADS8318IDRCT equivalent, key selection considerations include its 10-pin SON package, ±0.75 LSB max DNL, 95.2 dB SNR at 10 kHz, daisy-chain capability, and power-down current of 0.25 µW - critical for low-power embedded sensing and portable medical devices.
Technical Context
The ADS8318IDRCT implements 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 SCLK timing, and acquisition completes in 600 ns.
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 precedes 16-bit output in selected modes, simplifying host synchronization without external handshaking signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = Vref/65536 quantization step for high-precision sensor digitization |
| Sample Rate | 500 kSPS - supports real-time capture of signals up to 15 MHz small-signal bandwidth |
| SNR @ 10 kHz | 95.2 dB typical - enables >15.5 ENOB for clean dynamic signal measurement |
| INL / DNL | ±1.0 / ±0.75 LSB max - ensures monotonicity and minimal code-width variation across full scale |
| Power Dissipation | 18 mW typical at 500 kSPS - scales linearly to 3.6 mW/100 kSPS for adaptive power management |
| Power-Down Current | 0.25 µW typical - reduces system standby power in intermittent-sampling applications |
| Reference Range | 2.048 V to 5.5 V - accommodates standard voltage references including 2.5 V, 4.096 V, and 5 V rails |
Pinout & Package
ADS8318IDRCT is housed in a 10-pin 3 mm × 3 mm SON (Small Outline No-Lead) package with wettable flanks, rated MSL2 per JSTD-020 and optimized for automated optical inspection and thermal performance (θJA = 70°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REFIN | Analog reference input | Accepts external 2.048–5.5 V reference; requires 0.1 µF bypass + 10 µF storage capacitor to GND |
| 2 - +VA | Analog power supply | 4.5–5.5 V supply for SAR core; decoupled to GND to minimize noise coupling into conversion |
| 3 - +IN | Differential analog input (+) | High-impedance input (59 pF); accepts –Vref to +Vref swing with common-mode = Vref/2 |
| 4 - –IN | Differential analog input (–) | Paired with +IN; matched input capacitance and leakage (<1 nA) ensures common-mode rejection ≥78 dB |
| 5 - GND | Common ground | Single ground for +VA and +VBD; mandatory star-point connection to minimize digital switching noise injection |
| 6 - CONVST | Conversion start / chip select | Rising edge initiates sampling; level at edge selects interface mode (CS vs. daisy-chain) |
| 7 - SDO | Serial data output | SPI-compatible output; tri-state controlled by CONVST/SCLK; outputs MSB first with optional busy bit |
| 8 - SCLK | Serial clock input | Accepts 33 MHz max clock (30 ns period); falling edge clocks out data; timing-critical for read stability |
| 9 - SDI | Serial data input | Mode-select control: logic level at CONVST rising edge determines CS/daisy-chain and busy enable |
| 10 - +VBD | Digital I/O supply | 2.375–5.5 V supply for interface logic; independent of +VA to isolate digital noise from analog section |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid 16-bit result immediately after tcnv = 1400 ns - eliminates pipeline delay in closed-loop control |
| Daisy-chain interface | Enables cascading multiple ADS8318IDRCT devices on single SCLK/SDO/SDI lines - reduces PCB trace count and controller GPIO usage |
| Unipolar differential input | Supports true differential measurement with common-mode rejection ≥78 dB - rejects noise in noisy industrial environments |
| Auto power-down | Enters 0.25 µW power-down state automatically after conversion completion - cuts idle power by >99.9% versus active mode |
| SPI compatibility | Interoperates with standard microcontroller SPI peripherals without protocol translation - accelerates firmware integration |
Applications
| Battery-Powered Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Portable handheld multimeter acquiring DC voltage, temperature, and resistance with 16-bit resolution and <1 µA quiescent current between samples. IC Role / Device Role: Primary ADC digitizing conditioned analog sensor outputs with minimal power overhead. Use Value: 0.25 µW power-down current extends battery life to >1 year on two AA cells; 500-kSPS throughput captures transient events during manual probe contact. | Use Scenario: Modular rack-mounted DAQ unit aggregating 8-channel analog inputs using synchronized ADS8318IDRCT converters. IC Role / Device Role: Channel-isolated SAR ADC providing simultaneous sampling-ready outputs via daisy-chained SDO. Use Value: Daisy-chain mode reduces host SPI bus loading and eliminates need for individual CS lines - simplifies backplane routing and FPGA resource usage. |
| Medical Electronics | Optical Networking Monitoring |
Use Scenario: Patient vital sign monitor measuring ECG amplitude and respiration rate with high common-mode noise immunity. IC Role / Device Role: Front-end ADC converting differential biopotential signals referenced to mid-supply common-mode. Use Value: 78 dB CMRR and ±0.75 LSB DNL ensure accurate waveform morphology preservation - meets IEC 60601-2-27 clinical accuracy requirements. | Use Scenario: Optical transceiver module monitoring laser bias current and photodiode feedback in real time. IC Role / Device Role: Precision current-sense ADC digitizing shunt voltage with fast 500-kSPS update for closed-loop power control. Use Value: 95.2 dB SNR at 10 kHz enables detection of sub-µA current variations - critical for maintaining stable optical output power under thermal drift. |
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 28-mW active power | Lacks daisy-chain and busy indicator - requires dedicated CS per channel in multi-ADC systems | Choose when maximum throughput >500 kSPS is required and board space allows separate CS routing |
| ADS8323IDRCT | 16-bit, 500-kSPS, integrated reference (2.5 V), 0.5-µA power-down current | Fixed internal reference limits input range flexibility; no REFIN pin - incompatible with external precision references | Choose when system-level BOM reduction outweighs need for adjustable reference voltage and ultra-low standby power |
Compared with ADS8318IDRCT, ADS8320IDRCT trades daisy-chain capability and lower power for higher speed, while ADS8323IDRCT sacrifices reference flexibility and lowest power-down current for simplified supply design - all three share identical 10-pin SON footprint but differ in interface control and reference architecture.
Availability
ADS8318IDRCT is available at Aetrix Electronics and suitable for battery-powered equipment, instrumentation and process control, medical electronics, and optical networking requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADS8318IDRCT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The ADS8318 product line delivers micropower, high-resolution SAR ADCs optimized for portable instrumentation, medical sensors, and industrial data loggers where zero-latency, low standby power, and flexible serial interfacing are essential.
FAQ
What is the maximum sampling frequency supported by the ADS8318IDRCT?
The ADS8318IDRCT supports a maximum throughput rate of 500 kSPS, with fixed 1400 ns conversion time and 600 ns acquisition time. This yields a minimum conversion cycle of 2000 ns, enabling deterministic timing for real-time control loops and synchronized multi-channel sampling when used in daisy-chain configuration.
Does the ADS8318IDRCT require an external reference voltage?
Yes, the ADS8318IDRCT requires an external reference voltage applied to the REFIN pin, supporting a range of 2.048 V to 5.5 V. The device does not include an internal reference; therefore, a stable, low-noise external reference (e.g., REF5025 or REF6025) must be used to achieve specified INL, DNL, and SNR performance.
How does the daisy-chain interface mode work on the ADS8318IDRCT?
The ADS8318IDRCT enters daisy-chain mode when SDI is low at the rising edge of CONVST. In this mode, multiple devices are connected serially: SDO of one feeds SDI of the next, sharing SCLK and CONVST. Each device shifts out its 16-bit result sequentially on a single SDO line, reducing interconnect complexity in multi-channel systems.
What is the power consumption of the ADS8318IDRCT during power-down mode?
The ADS8318IDRCT draws 0.25 µW typical power during power-down mode, corresponding to ~50 nA supply current at +VA = 5 V. The device automatically enters this state after conversion completion and remains there during acquisition, making it ideal for duty-cycled sensing applications where average power must be minimized.
Is the ADS8318IDRCT pin-compatible with other devices in the ADS83xx family?
No, the ADS8318IDRCT is not pin-compatible with most other ADS83xx-family members. While it shares the same 10-pin SON package outline with ADS8320IDRCT and ADS8323IDRCT, pin functions differ - notably, ADS8323 lacks REFIN and uses VREFOUT instead, and ADS8320 reassigns CONVST functionality. PCB layout must be verified per device-specific pinout diagrams.
ADS8318IDRCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 10-VFDFN Exposed Pad
- 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-VSON (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8318IDRCT FAQ
1.How can I place an order for ADS8318IDRCT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8318IDRCT 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 ADS8318IDRCT reliable?
The price and inventory of ADS8318IDRCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8318IDRCT is usually 5 days.
3.What payment methods are accepted for ADS8318IDRCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8318IDRCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8318IDRCT?
ADS8318IDRCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8318IDRCT 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 ADS8318IDRCT?
For technical support, including ADS8318IDRCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8318IDRCT requirements.
6.How does Aetrix verify that ADS8318IDRCT is sourced from the original manufacturer or authorized distributors?
All ADS8318IDRCT 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 ADS8318IDRCT meets industry standards.
7.What is the process for return or replacement of ADS8318IDRCT?
All ADS8318IDRCT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8318IDRCT, 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 ADS8318IDRCT part is unused and in its original packaging.
Return procedure for ADS8318IDRCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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