My Inquiry
My Account
Texas Instruments ADS8321EB/2K5G4
- Part No.:
- ADS8321EB/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS8321EB/2K5G4.pdf
- Description:
- IC ADC 16BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS8321EB/2K5G4 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 4.5mW at full rate, and supports SPI/SSI-compatible serial interface for microcontroller interfacing in portable data acquisition.
For engineers reviewing the ADS8321EB/2K5G4 datasheet, ADS8321EB/2K5G4 pinout, ADS8321EB/2K5G4 application, or ADS8321EB/2K5G4 equivalent, key selection considerations include its 16-bit resolution with tested INL of ±0.012%, differential input range up to ±VREF, power-down current of 3µA max, and compatibility with low-noise reference sources down to 500mV.
Technical Context
The ADS8321EB/2K5G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling 100kSPS conversion with no missing codes over –40°C to +85°C. Its analog front-end features matched input capacitance (25pF) and leakage current ≤1nA, supporting precise sampling within 4.5 clock cycles.
Digital operation relies on a synchronous 3-wire SPI/SSI interface with CS/SHDN dual-function control, DCLOCK-synchronized DOUT output (MSB-first), and binary two's complement data format. Power management includes automatic analog section shutdown post-conversion and full digital/analog shutdown when CS is high.
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 - enables real-time capture of signals up to 50kHz Nyquist bandwidth |
| Integral Linearity Error | ±0.012% FSR - ensures <1 LSB deviation across full code range, critical for precision measurement |
| Power Dissipation | 4.5mW at 100kHz - allows battery operation without thermal derating in compact enclosures |
| Power-Down Current | 3µA max - reduces standby consumption by >99.7% versus active mode for duty-cycled systems |
| Reference Range | 0.5V to VCC/2 - supports flexible scaling from 500mV to 2.5V, setting LSB size from 15.3µV to 76.3µV |
| Input Type | Differential bipolar - accepts ±VREF span with common-mode rejection >80dB up to 100kHz |
Pinout & Package
ADS8321EB/2K5G4 is housed in an MSOP-8 (DGK) package - 3mm × 3mm, 0.65mm pitch, thermally enhanced for low-power operation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | External voltage source (0.5V–2.5V) defining full-scale input range and LSB weight |
| +In | Non-Inverting Analog Input | Differential input node; accepts voltage from –0.1V to VCC+0.1V with 25pF capacitance |
| –In | Inverting Analog Input | Differential input node; accepts voltage from –0.1V to +4.0V, must match +In source impedance |
| GND | Analog Ground | Low-impedance return path for analog circuitry; requires dedicated analog ground plane |
| CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; HIGH forces full power-down (3µA), LOW enables conversion cycle |
| DOUT | Serial Data Output | CMOS-level output (0V to VCC), MSB-first, valid on falling DCLOCK edge after null bit |
| DCLOCK | Data Clock Input | Synchronizes serial transfer and conversion timing; 24kHz–2.4MHz range, min 200ns pulse width |
| +VCC | Power Supply | 4.75V–5.25V single supply; powers analog core and digital interface; bypass with 0.1µF ceramic |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 1mW average at 10kHz sampling - extends battery life in remote sensors and handheld instruments |
| Differential Bipolar Input | ±VREF full-scale range with >80dB CMRR - rejects common-mode noise in industrial transducer interfaces |
| SPI/SSI-Compatible Interface | 3-wire synchronous serial (CS, DCLOCK, DOUT) - simplifies MCU integration without external protocol logic |
| Pin Compatibility | Drop-in replacement for ADS7816 and ADS7822 - enables legacy design upgrades without PCB revision |
| No Missing Codes | Guaranteed over full temperature range - eliminates code gaps that cause non-monotonic behavior in control loops |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
|
Use Scenario: Continuous monitoring of temperature, pressure, or strain in field-deployed wireless nodes powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC capturing sensor outputs at 1–10kHz with automatic power-down between samples. Use Value: 1mW average power at 10kHz enables multi-year operation; differential input rejects EMI in unshielded enclosures. |
Use Scenario: High-voltage motor current sensing in PLC I/O modules using optocoupler-isolated signal paths. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing conditioned analog signals before transmission across barrier. Use Value: Bipolar differential input accommodates ±2.5V isolated amplifier outputs; 16-bit resolution preserves dynamic range across 100:1 current ratios. |
| Multi-Channel Vibration Analyzers | Robot Joint Torque Feedback |
|
Use Scenario: Simultaneous sampling of accelerometer arrays in predictive maintenance systems requiring phase-coherent time-domain analysis. IC Role / Device Role / Timing Role: Channel-specific ADC in synchronized multi-device configuration driven by shared DCLOCK and CS. Use Value: 100kHz throughput supports 4-channel 25kHz per-channel sampling; <1 LSB INL ensures amplitude accuracy for FFT-based fault detection. |
Use Scenario: Real-time torque estimation in servo-driven robotic joints using strain gauge bridges with ratiometric excitation. IC Role / Device Role / Timing Role: Precision bridge readout ADC interfaced to low-noise instrumentation amplifier with programmable gain. Use Value: 0.5V–2.5V reference flexibility matches bridge excitation; 25pF input capacitance minimizes settling time with low-Z amplifier outputs. |
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; ±0.018% INL (vs ±0.012% for ADS8321EB/2K5G4); same MSOP-8 package | Lacks differential input capability - unsuitable for noisy industrial environments requiring CMRR >80dB | Select when cost sensitivity outweighs need for differential rejection and higher linearity is not required. |
| ADS8322EB/2K5 | 16-bit, 100kHz, differential input, but requires external reference buffer; ±0.010% INL; same MSOP-8 footprint | Higher linearity at expense of added external op amp (e.g., OPA627); increased BOM count and layout complexity | Choose when absolute linearity <±0.010% is mandatory and board area permits reference buffering. |
Compared with ADS8321EB/2K5G4, ADS8320EB/2K5 sacrifices differential input and linearity for lower cost, while ADS8322EB/2K5 improves linearity but adds external component overhead - ADS8321EB/2K5G4 balances performance, integration, and ease of use for most portable and isolated measurement designs.
Availability
ADS8321EB/2K5G4 is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, multi-channel vibration analyzers, and robot joint torque feedback systems requiring stable component supply across extended production lifecycles.
Supply support for ADS8321EB/2K5G4 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 ICs.
The ADS8321EB/2K5G4 belongs to TI's precision SAR ADC product line, designed specifically for low-power, high-accuracy measurement in portable, isolated, and multi-channel data acquisition systems.
FAQ
What is the maximum sampling rate supported by the ADS8321EB/2K5G4?
The ADS8321EB/2K5G4 supports a maximum sampling rate of 100kHz across its full operating temperature range (–40°C to +85°C). This rate is achieved with a 2.4MHz DCLOCK input and requires 24 clock cycles per conversion. At lower rates, average power drops linearly - e.g., 1mW at 10kHz - due to extended power-down intervals between conversions. The device maintains no missing codes and specified linearity throughout this range.
Does the ADS8321EB/2K5G4 require an external reference voltage?
Yes, the ADS8321EB/2K5G4 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 0.5V to VCC/2 (i.e., up to 2.5V at 5V supply). The reference directly sets the full-scale input range (±VREF for differential mode) and LSB size (2×VREF/65536). Reference current ranges from 0.1µA to 80µA depending on sample rate and CS state, so low-output-impedance sources like buffered op amps (e.g., OPA627) are recommended for optimal performance.
What is the meaning of "pin-compatible to ADS7816 and ADS7822" for the ADS8321EB/2K5G4?
The ADS8321EB/2K5G4 shares identical pin assignments, electrical signaling, and package (MSOP-8 DGK) with ADS7816 and ADS7822, allowing direct physical replacement on existing PCBs. However, functional differences exist: ADS8321EB/2K5G4 offers 16-bit resolution (vs 12-bit for ADS7816/ADS7822), differential input (vs single-ended), and improved linearity (±0.012% vs ±0.05%). Firmware and timing may require updates to accommodate the wider data word and differential mode.
How does the power-down mode function on the ADS8321EB/2K5G4?
The ADS8321EB/2K5G4 enters power-down mode in two distinct states: (1) automatically after conversion completion (analog section disabled, digital section active), and (2) fully when CS/SHDN is driven HIGH (both analog and digital sections disabled, drawing ≤3µA). During active conversion, power scales linearly with sample rate - e.g., 4.5mW at 100kHz, 1mW at 10kHz. Full shutdown via CS HIGH is essential for ultra-low standby current in battery-critical applications.
What are the absolute maximum ratings for the analog inputs of the ADS8321EB/2K5G4?
The ADS8321EB/2K5G4 specifies absolute maximum analog input voltages of –0.3V to (VCC + 0.3V) on +In and –0.3V to +4.0V on –In. Exceeding these ranges risks permanent damage or degraded linearity. For safe operation within specifications, +In and –In must remain within GND – 0.3V to VCC + 0.3V and GND – 0.3V to 4.0V respectively, with differential span limited to ±VREF. Input leakage is ≤1nA, and capacitance is 25pF - requiring matched source impedances to avoid settling-induced errors.
ADS8321EB/2K5G4 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/2K5G4 FAQ
1.How can I place an order for ADS8321EB/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8321EB/2K5G4 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/2K5G4 reliable?
The price and inventory of ADS8321EB/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8321EB/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS8321EB/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8321EB/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8321EB/2K5G4?
ADS8321EB/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8321EB/2K5G4 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/2K5G4?
For technical support, including ADS8321EB/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8321EB/2K5G4 requirements.
6.How does Aetrix verify that ADS8321EB/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS8321EB/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS8321EB/2K5G4?
All ADS8321EB/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS8321EB/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for ADS8321EB/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS8321EB/2K5G4 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
