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Texas Instruments ADS8321E/2K5
- Part No.:
- ADS8321E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8321E/2K5.pdf
- Description:
- IC ADC 16BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,595
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Product details
Overview
The ADS8321E/2K5 from Texas Instruments is a 16-bit SAR analog-to-digital converter with differential bipolar input, 100kHz sampling rate, ±0.018% integral linearity error, and MSOP-8 package-designed for precision data acquisition in battery-powered remote sensors and isolated industrial monitoring systems.
For engineers reviewing the ADS8321E/2K5 datasheet, ADS8321E/2K5 pinout, ADS8321E/2K5 application, or ADS8321E/2K5 equivalent, key selection criteria include its 1mW average power at 10kHz, SPI/SSI-compatible serial interface, 500mV–2.5V reference voltage range, differential input architecture, and verified pin-compatibility with ADS7816 and ADS7822 for legacy design reuse.
Technical Context
The ADS8321E/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling full 16-bit conversion in 16 clock cycles with 4.5-cycle acquisition time. Its analog front-end supports true differential bipolar input spanning ±VREF, with common-mode range dependent on VREF and VCC.
Digital operation uses a synchronous 3-wire SPI/SSI interface: CS/SHDN initiates conversion and controls shutdown mode (3µA max), DCLOCK synchronizes serial output on falling edges, and DOUT delivers 16-bit two's complement data MSB-first with no pipeline delay-enabling real-time sampling control and short-cycling for partial-result readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 100kHz - supports real-time capture of signals up to ~40kHz Nyquist bandwidth |
| Integral Linearity | ±0.018% FSR - ensures <±1 LSB error across full code range for accurate DC and low-frequency measurements |
| Power Dissipation | 4.5mW at 100kHz - enables continuous high-speed operation in thermally constrained portable designs |
| Reference Range | 0.5V to 2.5V - sets full-scale input span as ±VREF; lower references reduce LSB size but increase noise sensitivity |
| Supply Voltage | 4.75V to 5.25V - specifies guaranteed performance window; extended range up to 5.25V supports stable rail operation |
| Power-Down Current | 3µA max - allows ultra-low quiescent state during idle intervals in duty-cycled sensor nodes |
Pinout & Package
ADS8321E/2K5 is housed in an MSOP-8 (DGK) package, 3.0mm × 3.0mm × 1.0mm body, with exposed pad not electrically connected. Pin assignments are validated per TI SBAS123B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Sets full-scale differential input range as ±VREF; accepts 0.5V–2.5V; draws ≤80µA at 10kHz |
| +In (Pin 2) | Non-Inverting Analog Input | Accepts differential input voltage; absolute range –0.1V to VCC+0.1V; 25pF input capacitance |
| –In (Pin 3) | Inverting Analog Input | Completes differential pair; absolute range –0.1V to +4.0V; matched impedance critical for linearity |
| GND (Pin 4) | Analog Ground | Primary return path for analog circuitry; must connect to clean analog ground plane, separate from digital ground |
| CS/SHDN (Pin 5) | Chip Select / Shutdown Control | Active-Low conversion trigger; HIGH forces full power-down (3µA); LOW enables conversion and serial output |
| DOUT (Pin 6) | Serial Data Output | CMOS-level output delivering 16-bit two's complement data MSB-first on DCLOCK falling edge |
| DCLOCK (Pin 7) | Data Clock Input | Synchronizes serial transfer; 24kHz–2.4MHz range; minimum 200ns high/low time at ≥4.75V |
| +VCC (Pin 8) | Power Supply | Single 4.75V–5.25V supply powering analog and digital sections; requires local 0.1µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| Differential Bipolar Input | Supports true ±VREF input range with common-mode rejection >80dB, enabling direct connection to instrumentation amplifiers and isolated signal chains |
| MicroPower Operation | Average dissipation <1mW at 10kHz via automatic power-down between conversions-critical for multi-year battery life in wireless sensors |
| SPI/SSI-Compatible Interface | 3-wire synchronous serial protocol eliminates need for parallel bus routing, reducing PCB layer count and EMI in compact modules |
| Short-Cycling Capability | CS/SHDN can terminate conversion after any bit-enables adaptive resolution (e.g., 4-bit wake-up check before full 16-bit read) to minimize system energy |
| Pin Compatibility | Direct drop-in replacement for ADS7816 and ADS7822 in existing MSOP-8 layouts, accelerating redesign and qualification |
Applications
| Portable Battery-Powered Sensors | Isolated Industrial Data Acquisition |
|---|---|
Use Scenario: Continuous voltage/current monitoring in handheld multimeters or wireless condition-monitoring nodes powered by coin cells or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs with 16-bit precision while maintaining sub-1mW average power draw at 1–10kHz sample rates. Use Value: Enables >5-year battery life without sacrificing resolution-leveraging power-down mode and short-cycling to minimize active time per measurement. | Use Scenario: High-voltage motor drive feedback in factory automation, where ADC must operate across galvanic isolation barriers with ±10V or ±5V input ranges. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing current shunt or resolver outputs; referenced to local isolated supply, interfacing to isolated SPI microcontroller. Use Value: Differential input rejects common-mode noise from switching inverters; 80dB CMRR ensures accuracy despite 100V/ns dv/dt transients across isolation barrier. |
| Remote Multi-Channel Sensor Nodes | Vibration Analysis Front-Ends |
Use Scenario: Distributed structural health monitoring using synchronized analog inputs from accelerometers, strain gauges, and temperature sensors across long cable runs. IC Role / Device Role / Timing Role: Channel-specific ADC in star-topology node; external clock synchronization enables simultaneous sampling across multiple ADS8321E/2K5 units. Use Value: 100kHz throughput and deterministic 16-cycle conversion allow precise phase alignment of vibration harmonics across channels without FPGA buffering. | Use Scenario: Edge-based predictive maintenance unit capturing high-fidelity acceleration waveforms from rotating machinery for FFT-based fault detection. IC Role / Device Role / Timing Role: High-SNR ADC digitizing low-noise IEPE accelerometer outputs; reference set to 2.5V to maximize ENOB at 10kHz input frequency. Use Value: 84dB SFDR and 85dB SNR at 10kHz enable reliable detection of sub-60dB harmonic sidebands indicative of bearing defects. |
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 |
|---|---|---|---|
| ADS7816IDGKR | 12-bit resolution, 200kHz sampling, same MSOP-8 pinout and SPI interface | Limited to medium-precision applications (e.g., basic temperature sensing); lacks bipolar differential input | Select when cost and speed outweigh resolution needs; verify reference and input drive compatibility |
| ADS8322E/2K5 | Same 16-bit SAR core but with internal reference (2.5V), eliminating external VREF dependency | Reduces BOM count and layout complexity; fixed reference limits input range flexibility | Choose for simplified design where ±2.5V full-scale is sufficient and external reference regulation is undesirable |
Compared with ADS7816IDGKR and ADS8322E/2K5, the ADS8321E/2K5 uniquely balances 16-bit precision, external reference flexibility (0.5V–2.5V), and verified pin-compatibility-making it optimal for upgrading legacy 12-bit systems or implementing variable-gain signal chains without PCB revision.
Availability
ADS8321E/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, isolated industrial monitoring, and remote multi-channel sensor systems requiring stable component supply and long-term production continuity.
Supply support for ADS8321E/2K5 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 ICs.
The ADS8321E/2K5 belongs to TI's precision SAR ADC product line, engineered specifically for low-power, high-accuracy data acquisition in space- and energy-constrained environments such as portable test equipment and distributed sensor networks.
FAQ
What is the maximum sampling rate supported by the ADS8321E/2K5?
The ADS8321E/2K5 supports a maximum sampling rate of 100kHz, achieved with a 2.4MHz DCLOCK signal and 24 clock cycles per conversion. At this rate, the device consumes 4.5mW typical power and maintains ±0.018% integral linearity. Lower sample rates reduce average power consumption linearly-e.g., 1mW at 10kHz-by extending time spent in power-down mode between conversions.
Does the ADS8321E/2K5 require an external reference voltage?
Yes, the ADS8321E/2K5 requires an external reference voltage applied to the VREF pin. It operates with VREF between 0.5V and 2.5V (VCC/2), directly setting the full-scale differential input range as ±VREF. Reference current varies with sample rate-up to 80µA at 10kHz-and the input exhibits 5GΩ resistance when CS is grounded, ensuring minimal loading on precision reference sources.
How does the power-down mode function on the ADS8321E/2K5?
The ADS8321E/2K5 enters power-down mode when CS/SHDN is driven HIGH, reducing supply current to ≤3µA. It also automatically powers down after each conversion completes while CS remains LOW. Full shutdown (analog + digital) occurs only when CS = HIGH; leaving CS LOW during idle periods keeps the digital section active, increasing current draw. This dual-mode control enables flexible energy management in burst-mode sensing applications.
Is the ADS8321E/2K5 compatible with standard SPI interfaces?
Yes, the ADS8321E/2K5 features a synchronous 3-wire serial interface fully compatible with SPI and SSI protocols. It uses CS/SHDN as chip select, DCLOCK as serial clock, and DOUT as data output-transferring 16-bit two's complement data MSB-first on DCLOCK falling edges. No additional control lines (e.g., MOSI/MISO) are needed, simplifying host MCU integration and reducing GPIO usage.
What are the absolute voltage limits for the +In and –In pins of the ADS8321E/2K5?
The +In pin of the ADS8321E/2K5 must remain within –0.1V to VCC+0.1V, and the –In pin within –0.1V to +4.0V under all operating conditions. Exceeding these ranges risks degraded linearity or permanent damage. These limits are independent of VREF and apply even during power-down. For robust operation with ±10V industrial signals, external level-shifting or attenuation circuitry is required prior to the ADC inputs.
ADS8321E/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Differential, Pseudo-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:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8321E/2K5 FAQ
1.How can I place an order for ADS8321E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8321E/2K5 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 ADS8321E/2K5 reliable?
The price and inventory of ADS8321E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8321E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS8321E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8321E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8321E/2K5?
ADS8321E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8321E/2K5 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 ADS8321E/2K5?
For technical support, including ADS8321E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8321E/2K5 requirements.
6.How does Aetrix verify that ADS8321E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS8321E/2K5 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 ADS8321E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS8321E/2K5?
All ADS8321E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8321E/2K5, 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 ADS8321E/2K5 part is unused and in its original packaging.
Return procedure for ADS8321E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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