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Texas Instruments ADS8321EB/250G4
- Part No.:
- ADS8321EB/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8321EB/250G4.pdf
- Description:
- IC ADC 16BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
ADS8321EB/250G4 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, consumes only 4.5mW at full speed, and supports SPI/SSI-compatible serial interface for microcontroller integration in portable data acquisition.
For engineers reviewing the ADS8321EB/250G4 datasheet, ADS8321EB/250G4 pinout, ADS8321EB/250G4 application, or ADS8321EB/250G4 equivalent, key selection criteria include its tested 15-bit no-missing-codes performance, 2.5V reference compatibility, power-down current of ≤3µA, differential input architecture, and verified pin-compatibility with ADS7816 and ADS7822 for drop-in replacement in legacy designs.
Technical Context
The ADS8321EB/250G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling 16-bit resolution with 16-clock-cycle conversion time and 4.5-clock-cycle acquisition window. Its analog front-end features matched +In/–In inputs with 25pF capacitance and <1nA leakage, supporting both single-ended and fully differential signal configurations.
Digital operation relies on a synchronous 3-wire SPI/SSI interface: CS/SHDN controls conversion initiation and power-down mode, DCLOCK synchronizes bit transfer on falling edges, and DOUT outputs 16-bit two's complement data MSB-first with zero pipeline delay. Reference voltage (0.5V to VCC/2) directly defines full-scale span (±VREF) and LSB size (2·VREF/65536).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR with no missing codes up to 15 bits - guarantees monotonicity and avoids code gaps in precision measurement systems. |
| Sampling Rate | 100kHz maximum throughput - enables real-time capture of signals up to 50kHz Nyquist bandwidth. |
| Integral Linearity | ±0.012% FSR (max) - corresponds to ±8.3 LSB error, critical for high-fidelity sensor digitization and calibration accuracy. |
| Power Dissipation | 4.5mW at 100kHz, 1mW at 10kHz - ultra-low active power enables battery operation for >1 year in intermittent-sampling applications. |
| Power-Down Current | ≤3µA - reduces system standby consumption by >99.7% versus active mode, essential for energy-harvesting nodes. |
| Reference Range | 0.5V to VCC/2 (2.5V max at 5V supply) - allows flexible scaling of input range while maintaining 16-bit effective resolution. |
| Input Configuration | Differential bipolar (±VREF) - rejects common-mode noise and supports true zero-centered signal acquisition. |
| Interface Protocol | SPI/SSI-compatible 3-wire serial - simplifies MCU integration without requiring dedicated ADC controller hardware. |
Pinout & Package
ADS8321EB/250G4 is housed in an MSOP-8 (DGK) package, 3.0mm × 3.0mm × 1.0mm body, 0.65mm pitch, exposed pad optional. Pin assignments are validated per TI SBAS123B datasheet Rev. September 2004.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Defines full-scale differential input range (±VREF); must be stable, low-noise, and bypassed with 0.1µF ceramic capacitor. |
| +In | Non-Inverting Analog Input | Accepts input voltage from –0.1V to VCC+0.1V; paired with –In for differential operation or fixed bias for single-ended use. |
| –In | Inverting Analog Input | Accepts input voltage from –0.1V to +4.0V; matching source impedance to +In is mandatory to avoid gain/linearity drift. |
| GND | Analog Ground | Primary return path for analog circuitry; requires dedicated low-impedance connection to clean analog ground plane. |
| CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full digital/analog shutdown (≤3µA), LOW enables conversion and serial output. |
| DOUT | Serial Data Output | CMOS-level output (0V to VCC), MSB-first, valid on falling DCLOCK edge; tri-states when CS goes HIGH. |
| DCLOCK | Data Clock Input | Asynchronous clock (24kHz–2.4MHz); falling edge clocks data out and controls conversion timing; duty cycle insensitive. |
| +VCC | Power Supply | 4.75V–5.25V nominal; requires local 0.1µF ceramic bypass placed adjacent to pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Differential Input | Supports ±VREF full-scale range with common-mode rejection >80dB - eliminates need for external level-shifting in bridge sensor interfaces. |
| MicroPower Operation | 4.5mW at 100kHz, 1mW at 10kHz - enables continuous monitoring in handheld test equipment without thermal derating. |
| Pin Compatibility | Direct replacement for ADS7816 and ADS7822 - allows upgrade to 16-bit resolution without PCB redesign or firmware changes. |
| Flexible Reference Scaling | 0.5V–2.5V reference range - permits trade-off between input dynamic range and noise sensitivity (e.g., 500mV ref yields 15LSB noise floor). |
| Short-Cycle Conversion | CS HIGH terminates output after any bit - reduces average power by >50% in threshold-detection applications (e.g., 4-bit early abort). |
| Low Input Capacitance | 25pF differential input capacitance - minimizes settling burden on driving amplifiers and enables use with high-output-impedance sensors. |
Applications
| Battery-Operated Data Loggers | Isolated Industrial Sensors |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring in solar charge controllers with 10-year battery life requirements. IC Role / Device Role / Timing Role: Primary 16-bit digitizer acquiring differential shunt measurements at 10kHz with automatic power-down between samples. Use Value: 1mW average power at 10kHz extends coin-cell lifetime beyond 3 years; differential input rejects EMI from nearby inverters. |
Use Scenario: High-voltage motor phase current sensing using opto-isolated front-end with ±10V input range. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned differential current signals before serial transmission across barrier. Use Value: Bipolar input accepts ±2.5V isolated output directly; 80dB CMRR suppresses common-mode transients induced by IGBT switching. |
| Multi-Channel Vibration Analyzers | Portable Medical ECG Front-Ends |
|
Use Scenario: Simultaneous sampling of 8 accelerometer channels in predictive maintenance edge node with FPGA coordination. IC Role / Device Role / Timing Role: One ADS8321EB/250G4 per channel, synchronized via shared DCLOCK and CS lines for coherent acquisition. Use Value: 100kHz rate captures 40kHz vibration harmonics; MSOP-8 footprint minimizes board area in dense multi-ADC layouts. |
Use Scenario: Low-power wearable ECG patch digitizing amplified lead-II differential signal with motion artifact rejection. IC Role / Device Role / Timing Role: Precision ADC interfaced to OPA2350 op-amp buffer, operating at 1kHz sample rate with adaptive power-down. Use Value: 16-bit resolution resolves 0.5µV ECG microvolt signals; 25pF input capacitance prevents op-amp instability with 0.1µF feedback cap. |
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, 200kSPS, but only 12-bit no-missing-codes guarantee; higher 12mW power at full rate; same MSOP-8 pinout. | Limited to lower-precision industrial control where 12-bit monotonicity suffices; lacks ADS8321EB/250G4's 15-bit linearity. | Select when cost is primary constraint and 12-bit ENOB meets system SNR targets. |
| ADS8320E/250 | 16-bit, 100kSPS, identical architecture but ADS8320E grade has ±0.018% INL (vs ±0.012% for ADS8321EB); same pinout and interface. | Suitable for non-critical instrumentation where 0.006% INL improvement is unnecessary; lower cost than EB grade. | Choose for volume production where ADS8321EB/250G4's tighter INL is not required for calibration budget. |
Compared with ADS7816IDGKR and ADS8320E/250, the ADS8321EB/250G4 delivers superior 15-bit no-missing-codes performance and lower power at equivalent sample rates, making it optimal for battery-powered precision measurement where long-term stability and minimal thermal drift are design priorities.
Availability
ADS8321EB/250G4 is available at Aetrix Electronics and suitable for battery-operated data loggers, isolated industrial sensors, and multi-channel vibration analyzers requiring stable component supply across extended product lifecycles.
Supply support for ADS8321EB/250G4 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 50 years of innovation in precision data converters and power management ICs.
The ADS8321EB/250G4 belongs to TI's precision SAR ADC product line, engineered for ultra-low-power, high-resolution digitization in portable instrumentation, remote sensing, and isolated measurement systems.
FAQ
What is the maximum sampling rate supported by the ADS8321EB/250G4?
The ADS8321EB/250G4 supports a maximum sampling rate of 100kHz, corresponding to a minimum conversion time of 16 clock cycles at 2.4MHz DCLOCK frequency. This rate is guaranteed over the full –40°C to +85°C temperature range with 4.75V–5.25V supply and 2.5V reference. At lower supply voltages (down to 2.7V), the maximum rate decreases per the typical performance curve "Maximum Sample Rate vs VCC".
Does the ADS8321EB/250G4 require an external reference voltage?
Yes, the ADS8321EB/250G4 requires an external reference voltage applied to the VREF pin. It operates with references from 0.5V to VCC/2 (2.5V maximum at 5V supply). The reference directly sets the full-scale differential input range (±VREF) and LSB size (2·VREF/65536). TI recommends bypassing VREF with a 0.1µF ceramic capacitor placed adjacent to the pin to ensure stability and low noise.
How does the power-down mode function on the ADS8321EB/250G4?
Power-down on the ADS8321EB/250G4 is controlled by the CS/SHDN pin: when driven HIGH, both analog and digital sections shut down, drawing ≤3µA. When CS is LOW, the device remains active during conversion and enters a partial power-down state post-conversion. Full shutdown current is independent of DCLOCK frequency, unlike the CS-LOW state where current scales with sample rate - a key distinction documented in Figure 10 of the SBAS123B datasheet.
Is the ADS8321EB/250G4 pin-compatible with other Texas Instruments ADCs?
Yes, the ADS8321EB/250G4 is explicitly pin-compatible with the ADS7816 and ADS7822, sharing identical MSOP-8 (DGK) pinout and function mapping. This allows direct replacement in existing designs to upgrade resolution from 12-bit to 16-bit without layout changes. However, users must verify that the host system's timing and reference configuration meet the ADS8321EB/250G4's stricter linearity and noise requirements.
What is the input voltage range specification for the ADS8321EB/250G4 analog inputs?
The ADS8321EB/250G4 specifies absolute input voltage limits of –0.1V to VCC+0.1V on the +In pin and –0.1V to +4.0V on the –In pin. Within these limits, the differential input range is ±VREF (e.g., ±2.5V with 2.5V reference). Exceeding these ranges risks violating linearity specifications and may cause permanent damage if absolute maximum ratings (–0.3V to VCC+0.3V) are breached.
ADS8321EB/250G4 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:
- Discontinued at Digi-Key
- 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/250G4 FAQ
1.How can I place an order for ADS8321EB/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8321EB/250G4 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/250G4 reliable?
The price and inventory of ADS8321EB/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8321EB/250G4 is usually 5 days.
3.What payment methods are accepted for ADS8321EB/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8321EB/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8321EB/250G4?
ADS8321EB/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8321EB/250G4 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/250G4?
For technical support, including ADS8321EB/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8321EB/250G4 requirements.
6.How does Aetrix verify that ADS8321EB/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS8321EB/250G4 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/250G4 meets industry standards.
7.What is the process for return or replacement of ADS8321EB/250G4?
All ADS8321EB/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8321EB/250G4, 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/250G4 part is unused and in its original packaging.
Return procedure for ADS8321EB/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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