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Texas Instruments ADS8321EB/250
- Part No.:
- ADS8321EB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8321EB/250.pdf
- Description:
- IC ADC 16BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:209
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Product details
Overview
The ADS8321EB/250 from Texas Instruments is a 16-bit SAR analog-to-digital converter with differential bipolar input, 100kHz sampling rate, ±0.012% 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 ADS8321EB/250 datasheet, ADS8321EB/250 pinout, ADS8321EB/250 application, or ADS8321EB/250 equivalent, key selection considerations include its 1mW average power at 10kHz, SPI/SSI-compatible serial interface, 500mV–2.5V programmable reference range, and verified pin-compatibility with ADS7816 and ADS7822 for legacy design reuse.
Technical Context
The ADS8321EB/250 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 voltage range dependent on VREF (e.g., 0–2.75V at VREF = 2.5V).
Digital operation uses a synchronous 3-wire SPI/SSI interface: CS/SHDN initiates conversion and controls shutdown mode (3µA max), DCLOCK synchronizes bit transfer on falling edge, and DOUT outputs 16-bit two's complement data MSB-first with no pipeline delay-enabling real-time sampling control and short-cycling for partial-result termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR - delivers 65,536 discrete output codes with no missing codes guaranteed. |
| Sampling Rate | 100kHz maximum - supports real-time acquisition of signals up to ~40kHz Nyquist bandwidth. |
| Integral Linearity | ±0.012% FSR (ADS8321EB) - ensures ≤1 LSB error across full scale, critical for precision sensor digitization. |
| Power Dissipation | 4.5mW at 100kHz / 1mW at 10kHz - enables multi-year battery life in portable telemetry nodes. |
| Reference Range | 0.5V to VCC/2 - allows flexible scaling (e.g., 2.5V ref → ±2.5V input range) while maintaining 16-bit resolution. |
| Interface | SPI/SSI-compatible 3-wire serial - interoperates with standard microcontroller SPI peripherals without protocol translation. |
| Supply Range | 4.75V to 5.25V - tightly regulated operation ensures stable LSB size and low gain drift (±0.024% typ). |
Pinout & Package
The ADS8321EB/250 is housed in an MSOP-8 (DGK) package with exposed pad for thermal enhancement and 0.65mm lead pitch. Pin functions are validated per TI SBAS123B datasheet Rev. September 2004.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Sets full-scale span (±VREF); accepts 0.5V–2.5V; draws ≤80µA at 10kHz sample rate. |
| +In (Pin 2) | Differential Non-Inverting Input | Accepts analog signal; absolute range –0.1V to VCC+0.1V; 25pF input capacitance. |
| –In (Pin 3) | Differential Inverting Input | Completes differential pair; absolute range –0.1V to +4.0V; matched impedance critical for linearity. |
| GND (Pin 4) | Analog Ground | Reference for analog circuitry; must connect to clean analog ground plane, separate from digital return paths. |
| 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 (0V to VCC); transmits 16-bit two's complement MSB-first on DCLOCK falling edge. |
| DCLOCK (Pin 7) | Data Clock Input | Controls conversion timing and serial bit rate; supports 24kHz–2.4MHz; min. 200ns high/low pulse width. |
| +VCC (Pin 8) | Power Supply | Single 4.75–5.25V supply; powers analog and digital sections; requires local 0.1µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | Average dissipation <1mW at 10kHz enables decade-scale battery life in wireless sensor nodes. |
| Differential Bipolar Input | True ±VREF range rejects common-mode noise in motor current or vibration sensing applications. |
| Short-Cycle Conversion | CS-driven early termination allows partial-result readout (e.g., 8–12 bits) to reduce system power and latency. |
| Low Reference Current | ≤0.8µA at 10kHz sample rate minimizes burden on precision reference buffers like OPA627. |
| Pin Compatibility | Direct replacement for ADS7816/ADS7822 in existing layouts-no PCB revision required. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless environmental sensor node measuring temperature, pressure, and humidity over LoRaWAN. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs with 16-bit resolution and low power consumption. Use Value: 1mW average power at 10kHz sampling extends AA battery life beyond 5 years; differential input rejects EMI in unshielded field deployments. | Use Scenario: High-voltage motor drive monitoring using opto-isolated analog front-end. IC Role / Device Role / Timing Role: Isolated-side ADC capturing phase current and bus voltage with galvanic separation. Use Value: Bipolar differential input accommodates ±2.5V isolated sensor outputs; MSOP-8 footprint simplifies creepage/clearance layout in compact isolation barriers. |
| Simultaneous Multi-Channel Systems | Industrial Controls |
Use Scenario: 8-channel synchronized vibration analysis module for predictive maintenance on rotating machinery. IC Role / Device Role / Timing Role: One ADS8321EB/250 per channel, driven by shared DCLOCK and CS for deterministic sampling alignment. Use Value: 100kHz throughput and 16-cycle conversion enable sub-10µs inter-channel skew; low noise (60µVrms) preserves FFT accuracy for bearing fault detection. | Use Scenario: Programmable logic controller (PLC) analog input module with 16-bit resolution and 4–20mA loop compatibility. IC Role / Device Role / Timing Role: Precision ADC interfacing with op-amp-based current-to-voltage conversion stage. Use Value: ±0.012% INL ensures <0.02% total measurement error across 0–100% range; SPI interface simplifies integration with ARM Cortex-M host MCU. |
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 | 16-bit, 200kHz, but higher power (12mW @ 100kHz); no differential input; single-ended only. | Requires external instrumentation amp for differential signals; less suitable for low-noise isolated acquisition. | Choose when higher speed is needed and input is inherently single-ended. |
| ADS8320E/250 | 16-bit, 100kHz, identical pinout and interface, but ±0.018% INL (ADS8321E grade) and higher power (4.5mW @ 100kHz). | Lower linearity limits use in metrology-grade applications requiring <1 LSB error. | Choose for cost-sensitive designs where ±0.018% INL is acceptable and ADS8321EB/250 is unavailable. |
Compared with ADS7816IDGKR and ADS8320E/250, the ADS8321EB/250 uniquely combines differential bipolar input, ultra-low 1mW power at 10kHz, and ±0.012% INL-making it optimal for battery-powered precision sensing where signal integrity and energy efficiency are co-constrained.
Availability
The ADS8321EB/250 is available at Aetrix Electronics and suitable for remote data acquisition, isolated industrial monitoring, simultaneous multi-channel vibration analysis, and PLC analog input modules requiring stable component supply across extended production lifecycles.
Supply support for ADS8321EB/250 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 and embedded processing technologies, with over 90 years of innovation in precision data conversion and low-power design.
The ADS8321EB/250 belongs to TI's precision SAR ADC product line, engineered specifically for high-resolution, low-power data acquisition in portable, isolated, and multi-channel industrial systems.
FAQ
What is the maximum sampling rate supported by the ADS8321EB/250?
The ADS8321EB/250 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 full 16-bit performance with no missing codes. Lower rates (e.g., 10kHz) reduce average power to under 1mW while preserving all specifications.
Does the ADS8321EB/250 require an external reference voltage?
Yes, the ADS8321EB/250 requires an external reference voltage applied to the VREF pin. It operates with any stable reference between 0.5V and VCC/2 (e.g., 2.5V at VCC = 5V). The reference directly defines the full-scale input range (±VREF for differential mode), and its stability and noise directly impact effective resolution-TI recommends low-noise buffers like OPA627 for optimal performance.
How does the power-down mode function on the ADS8321EB/250?
The ADS8321EB/250 enters full power-down mode when CS/SHDN is driven HIGH, reducing supply current to ≤3µA. When CS is LOW and no conversion is active, only the analog section shuts down; the digital interface remains partially active. For minimum power, assert CS HIGH between conversions-this is essential to achieve the documented 1mW average at 10kHz sampling.
Is the ADS8321EB/250 pin-compatible with other TI ADCs?
Yes, the ADS8321EB/250 is explicitly pin-compatible with the ADS7816 and ADS7822, sharing identical MSOP-8 (DGK) pinout, power, reference, and serial interface connections. This allows direct substitution in existing designs without PCB modification, though users must verify that the differential input capability and improved linearity of ADS8321EB/250 align with system requirements.
What data format does the ADS8321EB/250 output?
The ADS8321EB/250 outputs data in Binary Two's Complement format, with the most significant bit (MSB) transmitted first on the DOUT pin. For example, a +VREF input yields code 0x7FFF (32767), midscale (0V) yields 0x0000, and –VREF yields 0x8000 (–32768). This format supports direct connection to signed-integer arithmetic units in microcontrollers without software conversion.
ADS8321EB/250 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:
- -
ADS8321EB/250 FAQ
1.How can I place an order for ADS8321EB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8321EB/250 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 ADS8321EB/250 reliable?
The price and inventory of ADS8321EB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8321EB/250 is usually 5 days.
3.What payment methods are accepted for ADS8321EB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8321EB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8321EB/250?
ADS8321EB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8321EB/250 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 ADS8321EB/250?
For technical support, including ADS8321EB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8321EB/250 requirements.
6.How does Aetrix verify that ADS8321EB/250 is sourced from the original manufacturer or authorized distributors?
All ADS8321EB/250 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 ADS8321EB/250 meets industry standards.
7.What is the process for return or replacement of ADS8321EB/250?
All ADS8321EB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8321EB/250, 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 ADS8321EB/250 part is unused and in its original packaging.
Return procedure for ADS8321EB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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