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Texas Instruments ADS8327IBRSAR
- Part No.:
- ADS8327IBRSAR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS8327IBRSAR.pdf
- Description:
- IC ADC 16BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,518
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Product details
Overview
ADS8327IBRSAR from Texas Instruments is a 16-bit, 500-kSPS unipolar-input SAR analog-to-digital converter with built-in conversion clock, SPI/DSP-compatible serial interface, and industrial-grade operation (–40°C to +85°C). It delivers ±1 LSB max DNL, ±2 LSB max INL, 91 dB SNR at 10 kHz, and 100 dB SFDR - enabling high-precision data acquisition in transducer interfaces and medical instrumentation.
For engineers reviewing the ADS8327IBRSAR datasheet, ADS8327IBRSAR pinout, ADS8327IBRSAR application, or ADS8327IBRSAR equivalent, key selection considerations include its 4×4 QFN-16 package, dual-supply operation (+VA = 2.7–5.5 V, +VBD = 1.65–5.5 V), programmable EOC/INT polarity, and daisy-chain capability for multi-channel systems.
Technical Context
The ADS8327IBRSAR implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold. Its conversion logic uses an internal 10.5–12.2 MHz CCLK derived from SCLK or operates with external clocking up to 21 MHz.
It supports manual and auto-triggered conversion modes, features global CONVST independent of CS, and provides status output via EOC/INT/CDI with programmable polarity and duration - all while maintaining 16-bit no-missing-codes performance across temperature and supply variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes - ensures full dynamic range utilization in precision measurement systems. |
| Sampling Rate | 500 kSPS maximum throughput - supports real-time acquisition of fast transients in industrial control loops. |
| INL / DNL | ±2 LSB max INL, ±1 LSB max DNL - enables accurate DC calibration and low-gain error in sensor front-ends. |
| SNR / SFDR | 91 dB SNR, 100 dB SFDR at 10 kHz - meets requirements for high-fidelity signal capture in medical and test equipment. |
| Supply Range | +VA = 2.7–5.5 V, +VBD = 1.65–5.5 V - allows flexible I/O voltage scaling and compatibility with 1.8 V, 3.3 V, and 5 V digital controllers. |
| Power Dissipation | 10.6 mW at 2.7 V / 1.8 V, 32 mW at 5 V / 1.8 V - enables battery-powered or thermally constrained embedded designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial process control, motor drives, and outdoor instrumentation environments. |
Pinout & Package
ADS8327IBRSAR is housed in a 4×4 mm, 16-pin QFN package (RSA) with exposed thermal pad. Pin 1 is REF+ (REFIN); pin 16 is +VBD. The thermal pad is internally connected to substrate and may be tied to AGND or left floating - but must remain isolated from digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (Pin 1) | External reference input | Accepts 0.3–4.2 V reference voltage; determines full-scale input range (0 V to VREF). |
| REF− (Pin 16) | Reference return | Must connect to AGND via dedicated via to minimize noise coupling into reference path. |
| +IN (Pin 13) | Noninverting analog input | Primary unipolar input node; accepts 0 V to VREF relative to –IN (typically AGND). |
| –IN (Pin 14) | Inverting analog input | Typically grounded; establishes common-mode point for pseudo-differential input configuration. |
| CONVST (Pin 3) | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge. |
| EOC/INT/CDI (Pin 4) | Status/data chain input | Configurable as end-of-conversion flag, interrupt output, or daisy-chain data input in multi-device systems. |
| FS/CS (Pin 5) | Frame sync / chip select | Active-low SPI slave select or TMS320 DSP frame sync; enables serial interface access and read timing control. |
| SCLK (Pin 9) | Serial clock input | Drives both interface timing and internal conversion clock (when configured as dual-purpose). |
| SDI (Pin 6) | Serial data input | Accepts configuration commands (e.g., reset, polarity setup) and supports software-initiated conversions. |
| SDO (Pin 7) | Serial data output | Provides 16-bit straight-binary result MSB-first; tri-state controlled by CS/FS deassertion. |
| +VA (Pin 11) | Analog supply | Powers core ADC, reference buffer, and sample-and-hold; requires local 100 nF + 10 µF decoupling. |
| +VBD (Pin 10) | Digital I/O supply | Supplies interface logic; supports 1.65–5.5 V to match host processor I/O voltage levels. |
| AGND (Pin 15) | Analog ground | Return for analog circuitry; must be separated from BDGND and connected at single point near power entry. |
| BDGND (Pin 8) | Digital interface ground | Return for SCLK, SDI, SDO, FS/CS; routed separately from AGND to prevent digital noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external clock source; internal 10.5–12.2 MHz oscillator simplifies system timing design. |
| Programmable EOC/INT polarity & duration | Allows synchronization with host controller interrupt latency or polling intervals without firmware modification. |
| Daisy-chain mode support | Enables cascaded readout of multiple ADS8327 devices using single SCLK/SDI/SDO lines - reduces PCB routing complexity. |
| Global CONVST independent of CS | Permits simultaneous sampling across multiple converters even when individual CS lines are asserted at different times. |
| Comprehensive power-down modes | Deep power-down (2–50 nA), Nap (0.2–0.5 mA), and Auto-Nap modes enable adaptive power management in portable systems. |
Applications
| Transducer Interface | Medical Instrumentation |
|---|---|
|
Use Scenario: High-resolution measurement of strain gauge, RTD, or pressure sensor outputs with low drift and wide dynamic range. IC Role / Device Role / Timing Role: Primary ADC in analog front-end; performs synchronized sampling with programmable trigger and low-latency status signaling. Use Value: ±1 LSB DNL and ±2 LSB INL ensure <10 ppm linearity error over temperature, critical for calibrated sensor output. |
Use Scenario: Acquisition of biopotential signals (ECG, EEG) requiring high SNR, low THD, and immunity to power supply ripple. IC Role / Device Role / Timing Role: Precision digitizer in patient monitoring system; leverages 91 dB SNR and 78 dB PSRR to reject mains-borne interference. Use Value: 100 dB SFDR prevents harmonic aliasing of physiological waveforms, preserving diagnostic fidelity. |
| Industrial Process Control | Data Acquisition Systems |
|
Use Scenario: Monitoring of motor current, voltage, and temperature in PLC I/O modules operating across extended temperature ranges. IC Role / Device Role / Timing Role: Isolated channel ADC in modular DAQ; uses global CONVST for phase-aligned sampling across multiple channels. Use Value: –40°C to +85°C qualification and 0.5 ppm/°C offset drift guarantee stable calibration in harsh factory environments. |
Use Scenario: Multi-channel benchtop data logger capturing vibration, acoustic, or environmental sensor data at 500 kSPS aggregate rate. IC Role / Device Role / Timing Role: Scalable ADC node in daisy-chained architecture; shares SCLK/SDI/SDO bus to minimize interconnect count. Use Value: 16-bit resolution with no missing codes ensures full utilization of 65,536-count range without interpolation artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8328IBRSAR | Dual-input MUX with programmable TAG bit; identical core ADC performance and pinout except +IN0/+IN1/COM pins replace +IN/–IN. | Required for multiplexed dual-channel sensing; not drop-in compatible due to input pin reassignment. | Select ADS8328IBRSAR only when 2:1 analog input switching or channel identification is needed. |
| ADS8329IPWR | 1-MSPS version in TSSOP-16; same architecture but higher speed, wider INL (±3 LSB max), and no deep power-down mode. | Used where throughput >500 kSPS is mandatory; consumes more power and lacks ultra-low-power sleep states. | Choose ADS8329IPWR if sampling rate is limiting, but verify thermal and power budget impact. |
Compared with ADS8327IBRSAR, ADS8328IBRSAR adds input multiplexing at the cost of pin compatibility, while ADS8329IPWR trades power efficiency and precision for speed - making ADS8327IBRSAR optimal for battery-powered or thermally sensitive 500-kSPS applications.
Availability
ADS8327IBRSAR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and transducer interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS8327IBRSAR 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 over 90 years of innovation in precision signal chain solutions.
The ADS8327IBRSAR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power data acquisition in industrial, medical, and test equipment where accuracy, reliability, and thermal stability are critical.
FAQ
What is the maximum external SCLK frequency supported by the ADS8327IBRSAR?
The ADS8327IBRSAR supports SCLK up to 50 MHz when used solely as an I/O clock, and up to 21 MHz when SCLK also serves as the conversion clock. At 21 MHz, the device achieves its rated 500-kSPS throughput with proper timing margins per the datasheet's tc(SCLK) and setup/hold requirements.
Does the ADS8327IBRSAR require an external reference voltage?
Yes, the ADS8327IBRSAR requires an external reference applied between REF+ and REF− pins. It accepts reference voltages from 0.3 V to 4.2 V (for +VA ≥ 2.7 V) or up to 4.2 V (for +VA ≥ 4.5 V), defining the full-scale input range as 0 V to VREF at the +IN input.
How does the power-down functionality work in the ADS8327IBRSAR?
The ADS8327IBRSAR offers three power-down modes: Deep Power-Down (2–50 nA), Nap (0.2–0.5 mA), and Auto-Nap (automatically entered after conversion completes). These are controlled via SPI commands and reduce power consumption without losing configuration state or requiring reinitialization.
Can the ADS8327IBRSAR be used in daisy-chain configurations?
Yes, the ADS8327IBRSAR supports daisy-chain operation using the EOC/INT/CDI pin as a chain data input. In this mode, multiple devices share SCLK, SDI, and FS/CS lines, with SDO of one device connected to CDI of the next - enabling compact multi-ADC systems with minimal GPIO usage.
What is the meaning of the 'IB' suffix in ADS8327IBRSAR?
The 'IB' suffix denotes the industrial-grade temperature range (–40°C to +85°C) and tighter performance specifications: ±1 LSB max DNL, ±2 LSB max INL, and ±1 mV max offset error at 5 V - distinguishing it from the standard 'I' grade (±2 LSB DNL, ±3 LSB INL).
ADS8327IBRSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN 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, Single Ended
- 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:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8327IBRSAR FAQ
1.How can I place an order for ADS8327IBRSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8327IBRSAR 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 ADS8327IBRSAR reliable?
The price and inventory of ADS8327IBRSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8327IBRSAR is usually 5 days.
3.What payment methods are accepted for ADS8327IBRSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8327IBRSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8327IBRSAR?
ADS8327IBRSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8327IBRSAR 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 ADS8327IBRSAR?
For technical support, including ADS8327IBRSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8327IBRSAR requirements.
6.How does Aetrix verify that ADS8327IBRSAR is sourced from the original manufacturer or authorized distributors?
All ADS8327IBRSAR 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 ADS8327IBRSAR meets industry standards.
7.What is the process for return or replacement of ADS8327IBRSAR?
All ADS8327IBRSAR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8327IBRSAR, 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 ADS8327IBRSAR part is unused and in its original packaging.
Return procedure for ADS8327IBRSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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