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Texas Instruments ADS8321EB/2K5
- Part No.:
- ADS8321EB/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8321EB/2K5.pdf
- Description:
- IC ADC 16BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,093
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Product details
Overview
ADS8321EB/2K5 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. It operates from 4.75V to 5.25V supply, consumes only 4.5mW at full speed, and supports SPI/SSI-compatible serial interface for embedded data acquisition systems.
For engineers reviewing the ADS8321EB/2K5 datasheet, ADS8321EB/2K5 pinout, ADS8321EB/2K5 application, or ADS8321EB/2K5 equivalent, key selection considerations include its micro-power operation at low sample rates (1mW at 10kHz), 3µA max power-down current, 25pF input capacitance, reference voltage range of 500mV to VCC/2, and compatibility with isolated or battery-powered signal chains requiring 16-bit precision.
Technical Context
The ADS8321EB/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling 16-bit resolution with no missing codes over –40°C to +85°C. Its internal sample-and-hold function eliminates external hold circuitry, and conversion timing is fully synchronous to DCLOCK with 16 clock cycles per conversion.
Differential input structure supports both single-ended and true differential modes, with common-mode voltage range dependent on VREF (e.g., ±2.5V at VREF = 2.5V). Reference current scales with sample rate (0.8µA at 10kHz, up to 80µA at 100kHz), and digital output follows Binary Two's Complement format with MSB-first transmission on DOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output levels for high-fidelity signal digitization |
| Sampling Rate | 100kHz - supports real-time monitoring of fast transients in vibration or control loops |
| Integral Linearity Error | ±0.012% FSR - ensures <1 LSB deviation across full scale, critical for calibration-sensitive systems |
| Power Dissipation | 4.5mW at 100kHz - enables continuous operation in thermally constrained portable designs |
| Power-Down Current | 3µA max - allows ultra-low quiescent operation during idle intervals in duty-cycled sensors |
| Reference Range | 500mV to VCC/2 - permits flexible scaling of input span (e.g., ±2.5V full-scale at VCC = 5V) |
| Input Capacitance | 25pF - defines required driver bandwidth and settling time (4.5 clock cycles @ 2.4MHz) |
| Common-Mode Rejection | 80dB - suppresses noise coupled equally to +In and –In in noisy industrial environments |
Pinout & Package
ADS8321EB/2K5 is housed in an MSOP-8 (DGK) package - 3mm × 3mm, 0.65mm pitch, exposed pad optional - optimized for space-constrained PCB layouts in portable instrumentation and modular DAQ systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Sets full-scale input span (±VREF); requires low-noise source and 0.1µF local bypass |
| +In | Non-Inverting Analog Input | Accepts voltage within –0.1V to VCC+0.1V; matched impedance with –In prevents gain/offset drift |
| –In | Inverting Analog Input | Accepts voltage within –0.1V to +4.0V; differential mode enables rejection of common-mode interference |
| GND | Analog Ground | Must connect to clean analog ground plane - separate from digital ground to avoid coupling errors |
| CS/SHDN | Chip Select / Shutdown Control | Active-Low conversion trigger; HIGH forces full power-down (3µA), LOW enables conversion and serial output |
| DOUT | Serial Data Output | CMOS-level, MSB-first, 16-bit Binary Two's Complement; tri-states after LSB when CS goes HIGH |
| DCLOCK | Data Clock Input | Synchronizes conversion and serial transfer; 24kHz–2.4MHz range; falling edge clocks valid data to DOUT |
| +VCC | Power Supply | 4.75V–5.25V nominal; requires 0.1µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Micro-Power Operation | 1mW average at 10kHz sample rate - extends battery life in remote sensor nodes beyond 5 years |
| Synchronous Serial Interface | SPI/SSI-compatible 3-wire protocol - simplifies host MCU integration without additional level-shifting |
| Differential Bipolar Input | ±VREF full-scale range with 80dB CMRR - enables direct connection to bridge sensors or op-amp outputs |
| Pin Compatibility | Direct replacement for ADS7816 and ADS7822 - allows reuse of existing PCB layouts and firmware drivers |
| No Missing Codes | Guaranteed over full temperature range - eliminates code gaps that cause non-monotonicity in closed-loop control |
| Low Transition Noise | ±0.8LSB (peak-to-peak) - supports high-resolution DC measurements without oversampling penalty |
Applications
| Portable Battery-Powered Sensors | Isolated Industrial Data Acquisition |
|---|---|
Use Scenario: Continuous voltage monitoring in handheld multimeters or wireless condition-monitoring nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs with 16-bit fidelity while minimizing system power budget. Use Value: 1mW average power at 10kHz enables >5-year battery life; MSOP-8 footprint fits compact enclosures. |
Use Scenario: Signal conditioning in DIN-rail mounted I/O modules where analog inputs are galvanically isolated from controller side. IC Role / Device Role / Timing Role: High-precision front-end digitizer interfacing with isolated amplifiers and optocoupled serial links. Use Value: 80dB CMRR rejects ground-loop noise; SPI interface simplifies isolation of digital signals only. |
| Multi-Channel Simultaneous Sampling Systems | Vibration Analysis Front Ends |
Use Scenario: Synchronized acquisition across 8–16 channels in motor drive diagnostics or power quality analyzers. IC Role / Device Role / Timing Role: Channel-specific ADC with deterministic 100kHz throughput and minimal inter-channel skew. Use Value: Identical conversion timing (16 clock cycles) across units ensures phase coherence; low power eases thermal management. |
Use Scenario: High-fidelity capture of accelerometer or microphone outputs in predictive maintenance edge devices. IC Role / Device Role / Timing Role: Low-noise digitizer preserving spectral integrity up to Nyquist (50kHz) for FFT-based fault detection. Use Value: 87dB SNR and 86dB SFDR enable detection of sub-millivolt harmonics buried in broadband noise. |
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 |
|---|---|---|---|
| ADS8320EB/2K5 | 16-bit, 100kHz, but single-ended input only; no differential mode; higher offset error (±2mV vs ±1mV) | Limited to unipolar or referenced single-ended sources; unsuitable for true differential sensors or bridge circuits | Select when cost sensitivity outweighs need for differential rejection and bipolar range |
| ADS8322EB/2K5 | 16-bit, 100kHz, same pinout, but includes internal reference (2.5V); higher power (6.5mW at 100kHz) | Reduces BOM count by eliminating external reference IC; less flexible VREF scaling (fixed 2.5V) | Choose when system-level reference stability is prioritized over power efficiency and input range flexibility |
Compared with ADS8321EB/2K5, ADS8320EB/2K5 sacrifices differential input and precision for lower cost, while ADS8322EB/2K5 trades adjustable reference capability for integrated simplicity-making ADS8321EB/2K5 optimal for applications demanding both bipolar differential sensing and ultra-low power.
Availability
ADS8321EB/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, isolated industrial data acquisition, multi-channel simultaneous sampling systems, and vibration analysis front ends requiring stable component supply across extended production lifecycles.
Supply support for ADS8321EB/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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADS8321EB/2K5 belongs to TI's precision SAR ADC product line, designed specifically for battery-powered, isolated, and multi-channel data acquisition systems where micro-power operation and 16-bit accuracy must coexist.
FAQ
What is the maximum clock frequency supported by ADS8321EB/2K5?
The ADS8321EB/2K5 supports a DCLOCK frequency range of 24kHz to 2.4MHz. At 2.4MHz, it achieves its rated 100kHz throughput with 24 clock cycles per conversion (16 for conversion + 4.5 for sampling + overhead). Operating above 2.4MHz risks timing violations and degraded linearity due to insufficient internal settling time.
Does ADS8321EB/2K5 require an external reference voltage?
Yes, ADS8321EB/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 500mV to VCC/2 (e.g., 2.5V when VCC = 5V). The reference directly sets the full-scale input range (±VREF), and its noise and drift directly impact overall system accuracy - TI recommends low-noise buffers like OPA627 for critical applications.
Can ADS8321EB/2K5 operate from a 3.3V supply?
No, ADS8321EB/2K5 is specified only for 4.75V to 5.25V supply operation. While absolute maximum rating allows VCC up to 6V, performance parameters - including linearity, SNR, and reference compliance - are guaranteed solely within the 4.75V–5.25V range. Using 3.3V violates datasheet specifications and will result in undefined behavior or failure to meet AC/DC specs.
How does the power-down mode work on ADS8321EB/2K5?
ADS8321EB/2K5 enters full power-down mode when CS/SHDN is driven HIGH, reducing supply current to ≤3µA. When CS is LOW, the device remains active during conversion and serial output; leaving CS LOW after conversion keeps the digital section partially active, increasing current draw. For minimum power, assert CS HIGH between conversions - especially at low sample rates like 10kHz where average dissipation drops to 1mW.
Is ADS8321EB/2K5 pin-compatible with ADS7816 and ADS7822?
Yes, ADS8321EB/2K5 is explicitly documented as pin-compatible with ADS7816 and ADS7822 in TI's SBAS123B datasheet. All three share identical MSOP-8 (DGK) pinout, power supply requirements, and serial interface timing - enabling drop-in replacement in legacy designs without PCB or firmware changes, though ADS8321EB/2K5 adds improved linearity (±0.012% vs ±0.02%) and lower power.
ADS8321EB/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:
- -
ADS8321EB/2K5 FAQ
1.How can I place an order for ADS8321EB/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8321EB/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 ADS8321EB/2K5 reliable?
The price and inventory of ADS8321EB/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8321EB/2K5 is usually 5 days.
3.What payment methods are accepted for ADS8321EB/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8321EB/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8321EB/2K5?
ADS8321EB/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8321EB/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 ADS8321EB/2K5?
For technical support, including ADS8321EB/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8321EB/2K5 requirements.
6.How does Aetrix verify that ADS8321EB/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS8321EB/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 ADS8321EB/2K5 meets industry standards.
7.What is the process for return or replacement of ADS8321EB/2K5?
All ADS8321EB/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8321EB/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 ADS8321EB/2K5 part is unused and in its original packaging.
Return procedure for ADS8321EB/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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