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Texas Instruments ADS8328IBPWR
- Part No.:
- ADS8328IBPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8328IBPWR.pdf
- Description:
- IC ADC 16BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
ADS8328IBPWR from Texas Instruments is a 16-bit, 500-kSPS pseudo-differential SAR analog-to-digital converter with integrated 2:1 input multiplexer, programmable TAG bit output, and SPI/DSP-compatible serial interface. It operates from 2.7 V to 5.5 V analog supply, delivers ±1 LSB max DNL and ±2 LSB max INL over temperature, and supports daisy-chain mode for multi-converter systems in industrial data acquisition.
For engineers reviewing the ADS8328IBPWR datasheet, ADS8328IBPWR pinout, ADS8328IBPWR application, or ADS8328IBPWR equivalent, key selection considerations include unipolar input range (0 V to VREF), built-in conversion clock (10.5–12.6 MHz), deep power-down mode (≤50 nA), 4×4 QFN-16 package, and dual-channel auto/manual channel select capability.
Technical Context
The ADS8328IBPWR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its 2:1 MUX enables sequential sampling of +IN0 and +IN1 against COM, with programmable TAG bit indicating active channel in chain mode.
Conversion timing is governed by an internal CCLK derived from SCLK (fCCLK = fSCLK/2), requiring 18 CCLK cycles for full conversion and 3 CCLK cycles for acquisition. The EOC/INT/CDI pin serves triple function: end-of-conversion flag, interrupt output, or chain-data input-configurable via serial command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes; guarantees monotonic transfer function across full operating range. |
| Sampling Rate | 500 kSPS maximum throughput; enables real-time capture of signals up to 250 kHz Nyquist bandwidth. |
| INL / DNL | ±2 LSB max integral linearity and ±1 LSB max differential linearity; ensures accurate amplitude fidelity in precision measurement. |
| SNR / THD | 91 dB SNR and –96 dB THD at 10 kHz input (VREF = 4.096 V); supports high-fidelity signal reconstruction in sensor interfaces. |
| Power Dissipation | 10.6 mW at 2.7 V analog supply; enables battery-powered or thermally constrained embedded designs. |
| Reference Input | External REF+ and REF− pins accept 2.5 V or 4.096 V reference; allows flexible scaling for transducer output ranges. |
| Serial Interface | SPI/DSP-compatible with SCLK up to 50 MHz; supports daisy-chain operation without external logic. |
Pinout & Package
ADS8328IBPWR is housed in a 4×4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate. Pin 1 is REF+ (REFIN); pin 2 is NC; pin 3 is CONVST; pin 4 is EOC/INT/CDI; pin 5 is FS/CS; pin 6 is SDI; pin 7 is SDO; pin 8 is BDGND; pin 9 is SCLK; pin 10 is +VBD; pin 11 is +VA; pin 12 is +IN1; pin 13 is +IN0; pin 14 is COM; pin 15 is AGND; pin 16 is REF−.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN0 / +IN1 | Dual noninverting analog inputs | Selectable via internal MUX; supports differential or single-ended unipolar measurements relative to COM. |
| COM | Common inverting input | Typically tied to AGND; defines common-mode reference for pseudo-differential input stage. |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge. |
| EOC/INT/CDI | Multi-function status/data pin | Configurable as end-of-conversion flag, programmable-polarity interrupt, or chain-data input in daisy-chain mode. |
| FS/CS | Frame sync / chip select | Enables SPI slave operation or TMS320 DSP frame synchronization; asserts device for serial communication. |
| SDI / SDO | Serial data in/out | Full-duplex SPI interface; SDI accepts configuration commands and reset bits; SDO outputs 16-bit result plus optional TAG bit. |
| REF+ / REF− | External reference inputs | Accept precision voltage reference; REF− must be connected to AGND via low-inductance path to minimize noise coupling. |
| +VA / +VBD | Analog / digital I/O supplies | +VA powers analog core (2.7–5.5 V); +VBD powers digital interface (1.65–1.5×+VA), enabling mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable TAG bit output | Appends 1-bit channel identifier to 16-bit data word in daisy-chain mode, eliminating external demux logic for multi-channel systems. |
| Auto/Manual channel select | Hardware-selectable MUX control allows deterministic sequencing (auto) or host-driven selection (manual) of +IN0/+IN1 inputs. |
| Built-in conversion clock | Internal CCLK generator eliminates need for external clock source when SCLK drives both interface and conversion timing. |
| Comprehensive power-down modes | Deep power-down (≤50 nA), Nap (≤500 nA), and Auto-Nap modes enable dynamic power scaling based on sampling duty cycle. |
| Global CONVST with independent CS | Allows synchronized sampling across multiple ADS8328 devices using shared CONVST while maintaining individual CS control for readout. |
Applications
| Industrial Process Monitoring | Medical Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in PLC-controlled factory lines. IC Role / Device Role / Timing Role: ADC front-end converting conditioned transducer outputs into digital data for real-time control loop execution. Use Value: ±1 LSB DNL and 91 dB SNR ensure sub-0.0015% amplitude accuracy required for closed-loop PID stability. | Use Scenario: High-resolution acquisition of ECG, EEG, and impedance plethysmography signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision digitizer capturing low-amplitude bio-signals with minimal added noise or distortion. Use Value: –96 dB THD and 100 dB SFDR preserve subtle waveform harmonics critical for arrhythmia detection algorithms. |
| Magnetometer Signal Conditioning | Automated Test Equipment (ATE) |
Use Scenario: Digitizing fluxgate or AMR magnetometer outputs for navigation-grade heading estimation. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC interfacing directly to low-output-impedance magnetic sensor bridges. Use Value: ±0.4 mV offset error at 5 V and 0.5 ppm/°C drift maintain calibration integrity across environmental temperature swings. | Use Scenario: Multi-channel voltage/current measurement in benchtop ATE systems performing parametric testing of ICs and passive components. IC Role / Device Role / Timing Role: High-speed, synchronized sampling node in modular ATE backplane with daisy-chained configuration. Use Value: Daisy-chain mode with TAG bit enables 16-bit per channel readout from 8+ converters using single SPI bus, reducing interconnect complexity. |
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 |
|---|---|---|---|
| ADS8327IBPWR | Single-input (no MUX), no TAG bit, identical performance specs and pinout except +IN1/COM pins replaced by +IN/–IN. | Best for single-channel unipolar applications where dual-input flexibility is unnecessary. | Select ADS8327IBPWR when only one analog input channel is required and board layout must remain compatible. |
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, no internal MUX, different SPI framing (no TAG), higher 12.5 mW typical power at 5 V. | Suitable for lower-speed, ultra-low-noise applications where 500 kSPS is not required. | Choose AD7682BCPZ-RL7 if system prioritizes lower THD (–105 dB) over speed and can accommodate separate channel sequencing logic. |
Compared with ADS8328IBPWR, ADS8327IBPWR removes channel selection overhead but sacrifices dual-input capability, while AD7682BCPZ-RL7 trades 2× lower throughput for improved harmonic distortion-making ADS8328IBPWR optimal for cost-sensitive, multi-channel, medium-speed industrial sensing.
Availability
ADS8328IBPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, magnetometer interfaces, and automated test equipment requiring stable component supply and guaranteed long-term manufacturability.
Supply support for ADS8328IBPWR 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 for industrial, automotive, and communications markets.
The ADS8328 belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power data acquisition in space- and energy-constrained systems where accuracy, speed, and integration are critical.
FAQ
What is the maximum sampling rate supported by the ADS8328IBPWR?
The ADS8328IBPWR supports a maximum throughput rate of 500 kSPS under specified conditions (TA = –40°C to +85°C, +VA = 2.7 V to 5.5 V, VREF = 2.5 V or 4.096 V). This rate is achieved using the internal conversion clock derived from SCLK, with fixed 18-cycle conversion time and 3-cycle acquisition window. External clocking above 21 MHz does not increase sampling rate due to internal timing constraints.
Does the ADS8328IBPWR require an external reference voltage?
Yes, the ADS8328IBPWR requires an external reference applied between REF+ and REF− pins. It accepts reference voltages of 2.5 V or 4.096 V, with REF− connected directly to AGND via a low-inductance path. The device does not include an internal reference; accuracy and stability depend entirely on the external reference source's performance and PCB layout.
How does the TAG bit function in daisy-chain mode for the ADS8328IBPWR?
In daisy-chain mode, the ADS8328IBPWR appends a 1-bit TAG to its 16-bit conversion result, indicating whether +IN0 (TAG = 0) or +IN1 (TAG = 1) was sampled. This bit is output on SDO during the 17th SCLK cycle and enables unambiguous channel identification across multiple chained devices without additional GPIO or address decoding logic.
What power-down modes are available on the ADS8328IBPWR and their typical current draw?
The ADS8328IBPWR offers three power-down modes: Deep Power-Down (≤50 nA), Nap Mode (≤500 nA), and Auto-Nap Mode (≤500 nA). Deep Power-Down disables all circuitry except wake-up logic; Nap retains register state and reference buffer bias; Auto-Nap automatically enters Nap after conversion completion. All modes retain configuration registers and require no reinitialization on wake-up.
Can the ADS8328IBPWR operate with mismatched analog and I/O supply voltages?
Yes, the ADS8328IBPWR supports independent analog (+VA = 2.7 V to 5.5 V) and digital I/O (+VBD = 1.65 V to 1.5×+VA) supplies. This allows interfacing with 1.8 V, 2.5 V, or 3.3 V microcontrollers while powering the analog core from a higher, cleaner rail-reducing digital switching noise coupling into sensitive analog sections.
ADS8328IBPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 2
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8328IBPWR FAQ
1.How can I place an order for ADS8328IBPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8328IBPWR 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 ADS8328IBPWR reliable?
The price and inventory of ADS8328IBPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8328IBPWR is usually 5 days.
3.What payment methods are accepted for ADS8328IBPWR?
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4.How is shipping managed for ADS8328IBPWR?
ADS8328IBPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8328IBPWR 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 ADS8328IBPWR?
For technical support, including ADS8328IBPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8328IBPWR requirements.
6.How does Aetrix verify that ADS8328IBPWR is sourced from the original manufacturer or authorized distributors?
All ADS8328IBPWR 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 ADS8328IBPWR meets industry standards.
7.What is the process for return or replacement of ADS8328IBPWR?
All ADS8328IBPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8328IBPWR, 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 ADS8328IBPWR part is unused and in its original packaging.
Return procedure for ADS8328IBPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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