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Texas Instruments ADS8328IPWR
- Part No.:
- ADS8328IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8328IPWR.pdf
- Description:
- IC ADC 16BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
ADS8328IPWR 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 ±2 LSB max INL and 91 dB SNR at 10 kHz, and targets precision data acquisition in industrial process control systems.
For engineers reviewing the ADS8328IPWR datasheet, ADS8328IPWR pinout, ADS8328IPWR application, or ADS8328IPWR equivalent, key selection considerations include its dual-channel unipolar input architecture, built-in conversion clock (10.5–12.6 MHz), deep power-down mode (2–50 nA), 4×4 QFN-16 package, and daisy-chain capability for multi-converter systems.
Technical Context
The ADS8328IPWR implements a capacitor-based successive approximation register (SAR) core with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its 2:1 MUX enables channel selection between +IN0 and +IN1 against COM, with programmable TAG bit indicating active channel in chain mode.
Conversion timing is governed by an internal CCLK (10.5–12.6 MHz) derived from SCLK or external source; total conversion time is fixed at 18 CCLK cycles (≈1.7 µs), with 3-CCLK acquisition window. Serial interface supports SPI Mode 0/3 and TMS320 DSP frame sync, with EOC/INT/CDI pin configurable as end-of-conversion flag, interrupt, or daisy-chain data input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across temperature. |
| Sampling Rate | 500 kSPS maximum throughput - enables real-time capture of signals up to ~200 kHz Nyquist bandwidth. |
| INL (Max) | ±2 LSB over –40°C to +85°C - ensures <0.003% full-scale linearity error for high-fidelity measurements. |
| SNR @ 10 kHz | 91 dB (VREF = 4.096 V, +VA = 5 V) - supports >15-bit effective resolution in narrowband applications. |
| Power Dissipation | 10.6 mW at 500 kSPS, +VA = 2.7 V, +VBD = 1.8 V - enables battery-powered or thermally constrained designs. |
| Input Range | 0 V to VREF (unipolar) - simplifies signal conditioning when paired with rail-to-rail op-amps or transducer outputs. |
| SCLK Max | 50 MHz (I/O-only mode) - allows fast readout and minimizes bus occupancy in high-throughput systems. |
Pinout & Package
The ADS8328IPWR is housed in a 16-pin 4×4 mm QFN package (RSA) with exposed thermal pad internally connected to substrate. Pin 1 is REF+ (REFIN); pins 15 and 16 are SCLK and +VBD respectively; AGND (pin 15 in TSSOP, pin 15 in QFN) and BDGND (pin 8 in QFN) are separate analog/digital grounds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA (Pin 11) | Analog supply input | 2.7–5.5 V supply for SAR core and input buffer; decoupling required near pin. |
| +VBD (Pin 10) | Digital I/O supply | 1.65–5.5 V logic supply; independent of +VA, enabling mixed-voltage system interfacing. |
| REF+ / REFIN (Pin 1) | External reference positive | Accepts 0.3–4.2 V reference; sets full-scale range (0 V to VREF) for unipolar conversion. |
| REF– (Pin 16) | Reference negative | Must be connected to AGND via low-inductance path; critical for reference stability and PSRR. |
| +IN0 (Pin 13), +IN1 (Pin 12) | Differential input channels | Selectable inputs for pseudo-differential operation; COM (Pin 14) serves as common inverting node. |
| COM (Pin 14) | Common inverting input | Typically tied to AGND; defines common-mode level for both +IN0 and +IN1 channels. |
| CONVST (Pin 3) | Conversion start trigger | Edge-sensitive input that freezes S/H and initiates conversion on next internal clock edge. |
| EOC/INT/CDI (Pin 4) | Status/data I/O | Configurable as end-of-conversion flag, programmable-polarity interrupt, or daisy-chain data input. |
| FS/CS (Pin 5) | Frame sync / chip select | Active-low SPI slave select or TMS320 frame sync; enables multi-device synchronization. |
| SCLK (Pin 9) | Serial clock input | Drives SPI interface; also sources internal CCLK when configured for combined I/O/conversion clocking. |
| SDI (Pin 6) | Serial data input | Accepts configuration commands (e.g., channel select, TAG enable) and software reset instructions. |
| SDO (Pin 7) | Serial data output | 3-state output delivering 16-bit straight-binary result; supports daisy-chain readout. |
| AGND (Pin 15) | Analog ground | Primary return for analog circuitry; must be isolated from digital ground to minimize noise coupling. |
| BDGND (Pin 8) | Digital interface ground | Return path for +VBD-supplied I/O; separation from AGND improves noise immunity in mixed-signal layouts. |
| NC (Pin 2) | No connection | Internally unconnected; leave floating or tie to AGND per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2:1 input MUX | Enables dual-channel sampling without external multiplexers, reducing BOM count and board space in multi-sensor systems. |
| Programmable TAG bit output | Appends channel identifier (0/1) to each 16-bit conversion result, eliminating software polling overhead in automatic channel sequencing. |
| Built-in conversion clock (CCLK) | Removes need for external clock generator; internal 10.5–12.6 MHz oscillator ensures deterministic timing and reduces jitter sensitivity. |
| Daisy-chain mode support | Allows cascading multiple ADS8328IPWR devices on single SPI bus using CDI/SDO routing, simplifying multi-channel expansion. |
| Three power-down modes | Deep power-down (2–50 nA), Nap (0.2–0.5 mA), and Auto-Nap (automatic entry/exit) enable dynamic power scaling in intermittent-sampling applications. |
| Global CONVST with CS independence | Starts conversion regardless of CS state, permitting synchronized sampling across multiple converters even during serial communication. |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow sensors in PLC-based control cabinets with 4–20 mA loop interfaces. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned sensor outputs at 500 kSPS with 16-bit resolution and low offset drift (±0.4 mV). Use Value: Enables closed-loop control with <0.0015% full-scale accuracy across –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Digitizing ECG, EEG, and bioimpedance signals in portable diagnostic devices requiring low power and high SNR. IC Role / Device Role / Timing Role: Precision SAR ADC capturing low-amplitude physiological waveforms with 91 dB SNR and 100 dB SFDR at 10 kHz. Use Value: Supports 15.6 ENOB for clean waveform reconstruction, while deep power-down mode extends battery life between patient measurements. |
| Magnetometer Data Acquisition | Automated Test Equipment (ATE) |
Use Scenario: Reading fluxgate or AMR magnetometer outputs in navigation systems where magnetic interference demands high CMRR. IC Role / Device Role / Timing Role: Dual-input ADC measuring differential magnetometer bridge outputs with 70 dB CMRR and 109 dB channel isolation. Use Value: Rejects common-mode noise from motor drivers or switching supplies, preserving nanotesla-level field resolution in harsh EMI environments. | Use Scenario: High-speed parametric testing of semiconductor devices using synchronized multi-channel voltage/current sampling. IC Role / Device Role / Timing Role: Multi-unit daisy-chained ADC providing time-aligned 16-bit samples across DUT power rails, sense lines, and thermal sensors. Use Value: Eliminates inter-device skew with global CONVST triggering and deterministic 18-CCLK conversion, enabling sub-microsecond timestamp correlation. |
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 |
|---|---|---|---|
| ADS8327IPWR | Single-input (no MUX), no TAG bit, identical speed/resolution/power specs and pinout compatibility in same package. | Lacks dual-channel capability; suitable only for single-sensor or externally multiplexed systems. | Select when channel count is fixed and board space allows external MUX or cost sensitivity favors simpler variant. |
| AD7682BCPZ-RL7 | 16-bit, 250 kSPS, pseudo-differential, SPI interface; higher INL (±3.5 LSB), lower SNR (86 dB), but includes internal reference and wider supply range (2.3–5.5 V). | Lower throughput limits dynamic signal capture; internal reference reduces external component count but sacrifices flexibility. | Prefer when system requires integrated reference and 250 kSPS suffices, especially in space-constrained medical or portable instrumentation. |
Compared with ADS8327IPWR, the ADS8328IPWR adds hardware channel selection and TAG bit at identical power and accuracy-ideal for dual-sensor monitoring. Versus AD7682BCPZ-RL7, it trades internal reference for higher speed and better AC performance, favoring systems with external precision references and demanding real-time response.
Availability
ADS8328IPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, magnetometer data acquisition, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS8328IPWR 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 ADS8328IPWR belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power data acquisition in industrial, medical, and test equipment where DC accuracy, AC performance, and flexible interface options are critical.
FAQ
What is the maximum external SCLK frequency supported by the ADS8328IPWR?
The ADS8328IPWR supports up to 50 MHz SCLK when used solely for I/O operations. When SCLK also serves as the conversion clock source, the maximum is 21 MHz. This dual-mode clocking allows system designers to optimize between serial throughput and conversion timing determinism, with all timing parameters fully specified in the SLAS415E datasheet for both configurations.
Does the ADS8328IPWR require an external reference voltage?
Yes, the ADS8328IPWR requires an external reference applied between REF+ and REF– pins. It accepts reference voltages from 0.3 V to 4.2 V (with +VA ≥ VREF), supporting common standards like 2.5 V and 4.096 V. The device does not include an internal reference; reference accuracy and stability directly determine overall measurement precision, making low-drift external references essential for high-accuracy applications.
How does the programmable TAG bit function in the ADS8328IPWR?
The TAG bit in ADS8328IPWR is appended to the MSB side of the 16-bit conversion result when enabled via SDI command. It indicates which input channel (+IN0 or +IN1) was sampled-'0' for +IN0, '1' for +IN1-eliminating software polling or external channel tracking. This feature is active only in auto-channel-select mode and requires proper configuration of the EOC/INT/CDI pin and serial interface timing.
Can the ADS8328IPWR operate with separate analog and digital supply voltages?
Yes, the ADS8328IPWR features independent +VA (2.7–5.5 V, analog core) and +VBD (1.65–5.5 V, digital I/O) supplies. This separation allows interfacing with 1.8 V, 3.3 V, or 5 V controllers while maintaining optimal analog performance. AGND and BDGND must be kept separate on PCB with single-point connection to minimize digital noise coupling into the analog section.
What are the power consumption characteristics of the ADS8328IPWR in different operating modes?
The ADS8328IPWR draws 3.8–5 mA at 500 kSPS with +VA = 2.7 V, dropping to 0.2–0.4 mA in Nap mode and just 2–50 nA in deep power-down. These states are controlled via SDI commands or hardware pins, enabling aggressive power management in battery-powered or thermally sensitive applications without sacrificing wake-up speed or measurement fidelity.
ADS8328IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
ADS8328IPWR FAQ
1.How can I place an order for ADS8328IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8328IPWR 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 ADS8328IPWR reliable?
The price and inventory of ADS8328IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8328IPWR is usually 5 days.
3.What payment methods are accepted for ADS8328IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8328IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8328IPWR?
ADS8328IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8328IPWR 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 ADS8328IPWR?
For technical support, including ADS8328IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8328IPWR requirements.
6.How does Aetrix verify that ADS8328IPWR is sourced from the original manufacturer or authorized distributors?
All ADS8328IPWR 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 ADS8328IPWR meets industry standards.
7.What is the process for return or replacement of ADS8328IPWR?
All ADS8328IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS8328IPWR, 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 ADS8328IPWR part is unused and in its original packaging.
Return procedure for ADS8328IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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