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Texas Instruments ADS7822E/2K5
- Part No.:
- ADS7822E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7822E/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:295
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Product details
Overview
ADS7822E/2K5 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with pseudo-differential input, serial CMOS interface, and microPower operation-consuming only 1.6mW at full rate and 3μA in power-down mode. It operates from 2.7V to 5.25V, supports external reference voltages from 50mV to VCC, and targets precision, low-power data acquisition in space- and energy-constrained systems.
For engineers reviewing the ADS7822E/2K5 datasheet, ADS7822E/2K5 pinout, ADS7822E/2K5 application, or ADS7822E/2K5 equivalent, key selection considerations include its MSOP-8 package, guaranteed ±2 LSB integral linearity over –40°C to +85°C, 75kHz–200kHz throughput scalability, synchronous 3-wire serial interface timing, and suitability for battery-powered remote sensing where quiescent current and shutdown behavior directly impact system runtime.
Technical Context
The ADS7822E/2K5 implements a capacitive redistribution successive approximation register (SAR) architecture on a 0.6μm CMOS process, integrating sample-and-hold functionality. Conversion is initiated by CS/SHDN falling edge, with sampling occurring over 1.5–2.0 clock cycles and fixed 12-cycle conversion time.
It features a synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT), outputs straight-binary 12-bit data MSB-first on DOUT's falling edge of DCLOCK, and supports short-cycling-allowing early termination after any bit count to reduce power or accelerate conditional monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit-provides 4096 discrete output codes for high-fidelity signal digitization. |
| Max Throughput Rate | 200kHz at VCC = 5V-enables real-time capture of fast transients in sensor or control loops. |
| Integral Linearity Error | ±2 LSB max-ensures monotonicity and predictable transfer function across full scale. |
| Power Dissipation | 1.6mW at 200kHz / 0.06mW at 7.5kHz-supports ultra-low-power operation with dynamic scaling. |
| Power-Down Current | 3μA max-minimizes standby drain in intermittently active data loggers or wake-on-event systems. |
| Reference Voltage Range | 50mV to VCC-allows flexible scaling of input range without external amplification or level-shifting. |
| Analog Input Type | Pseudo-differential (+In/–In)-rejects common-mode noise while enabling remote ground sensing via –In. |
Pinout & Package
ADS7822E/2K5 is housed in an MSOP-8 package (DGK marking), with exposed pad not electrically connected. Pin assignments are standardized across DIP-8, SO-8, and MSOP-8 variants per TI SBAS062C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Defines full-scale span; accepts 50mV–VCC; internal 5GΩ impedance when CS = GND or VCC. |
| +In (Pin 2) | Noninverting analog input | Accepts 0 to VCC + 0.2V; sampled differentially against –In during acquisition phase. |
| –In (Pin 3) | Inverting analog input | Limited to –0.2V to +1.0V; used for remote ground sensing-not resampled mid-conversion. |
| GND (Pin 4) | Analog/digital ground reference | Single ground plane required; decoupling capacitor must be placed adjacent to Pin 4 and Pin 8. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; high = full power-down (3μA); falling edge initiates sampling. |
| DOUT (Pin 6) | Serial data output | CMOS output (0V to VCC); MSB-first, valid on falling DCLOCK; tri-states after LSB repeat. |
| DCLOCK (Pin 7) | Data clock input | Synchronizes serial transfer; min pulse width 125ns (5V) or 400ns (2.7V); duty cycle noncritical. |
| +VCC (Pin 8) | Power supply | 2.7V–5.25V operation; supplies analog core, digital logic, and internal bias circuits. |
Key Features
| Feature | Design Value |
|---|---|
| MicroPower scalability | Quiescent current drops from 325μA @ 75kHz to 20μA @ 7.5kHz-enables adaptive sampling in energy-harvested nodes. |
| Pseudo-differential input | +In/–In architecture rejects up to ~1V of common-mode offset while preserving 12-bit resolution-ideal for isolated sensor front-ends. |
| Short-cycle conversion | CS high terminates output after any bit count (e.g., 4-bit early exit)-reduces average power and latency in threshold-triggered monitoring. |
| Wide reference flexibility | 50mV–VCC reference range allows direct digitization of mV-level thermocouple or bridge outputs without gain stages. |
| CMOS-compatible I/O | Digital inputs tolerate up to 6V regardless of VCC; DOUT swings rail-to-rail (0V to VCC)-simplifies interfacing with mixed-voltage controllers. |
Applications
| Battery-Powered Remote Sensor Node | Isolated Industrial Signal Conditioning |
|---|---|
|
Use Scenario: Continuous temperature/humidity logging in wireless field node powered by coin-cell battery. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog sensor outputs; triggered at 10Hz with CS-driven power cycling. Use Value: 3μA shutdown current extends battery life beyond 5 years; 12-bit resolution maintains calibration accuracy across 0–100% RH range. |
Use Scenario: Digitizing 4–20mA loop signals in PLC I/O module with galvanic isolation barrier. IC Role / Device Role / Timing Role: Isolated-side ADC converting voltage drop across shunt resistor; synchronized to host MCU via opto-isolated clock/data lines. Use Value: Pseudo-differential input rejects common-mode noise induced across isolation gap; 200kHz rate supports diagnostics and fast fault detection. |
| Portable Medical Vital Sign Monitor | Multi-Channel Data Acquisition System |
|
Use Scenario: ECG front-end in handheld patient monitor requiring low-noise, low-power analog capture. IC Role / Device Role / Timing Role: High-precision ADC digitizing amplified differential lead signals; reference set to 2.5V for optimal ENOB. Use Value: 71dB SINAD and 86dB SFDR meet AAMI EC11 requirements; 1.6mW dissipation prevents thermal drift in compact enclosure. |
Use Scenario: Simultaneous sampling of 8-channel vibration sensors in predictive maintenance gateway. IC Role / Device Role / Timing Role: One ADS7822E/2K5 per channel, sharing global DCLOCK and CS; DOUT lines multiplexed to single SPI controller. Use Value: Identical 12-cycle conversion time ensures deterministic inter-channel skew <10ns; MSOP-8 footprint minimizes PCB area per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U/2K5 | Same silicon, SO-8 package (D marking); 1.27mm pitch vs MSOP-8's 0.5mm; identical electrical specs. | Preferred for through-hole prototyping or legacy board compatibility; larger footprint limits channel density. | Select when board layout prioritizes hand-solderability or existing SO-8 footprints; no change to firmware or timing. |
| ADS7822EC/2K5 | Enhanced grade: ±0.75 LSB integral linearity (vs ±2 LSB); same MSOP-8 package and pinout. | Required for metrology-grade measurements where end-point accuracy exceeds ±0.05% FS. | Choose when absolute accuracy dominates cost/power trade-offs-e.g., calibrated test equipment or medical diagnostics. |
Compared with ADS7822U/2K5, the ADS7822E/2K5 saves 40% board area in dense multi-channel designs; compared with ADS7822EC/2K5, it trades 1.25 LSB linearity for lower unit cost and broader availability in volume production.
Availability
ADS7822E/2K5 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition modules, and isolated industrial signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for ADS7822E/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 low-power design.
The ADS7822 product line was engineered for ultra-low-power, high-resolution data acquisition in portable and distributed sensing applications-emphasizing microPower efficiency, small footprint, and robust serial interface simplicity.
FAQ
What is the maximum clock frequency supported by ADS7822E/2K5?
The ADS7822E/2K5 supports a maximum DCLOCK frequency of 3.2MHz at VCC = 5V (125ns minimum pulse width), enabling its full 200kHz throughput rate. At VCC = 2.7V, the limit drops to 1.2MHz (400ns minimum pulse width), restricting max throughput to 75kHz. These values are specified in the Absolute Maximum Ratings and Timing Characteristics sections of TI SBAS062C.
Does ADS7822E/2K5 require an external reference voltage?
Yes, ADS7822E/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50mV to VCC, and the full-scale input span is defined as VREF. No internal reference is provided-designers must supply a low-noise, well-bypassed reference source matching their accuracy and noise requirements.
Can ADS7822E/2K5 operate from a 3.3V supply?
Yes, ADS7822E/2K5 operates across 2.7V to 5.25V, making 3.3V fully compliant. At 3.3V, typical quiescent current is 200–325μA at 75kHz, and the device maintains ±2 LSB integral linearity over –40°C to +85°C. Logic levels remain compatible with 3.3V CMOS systems, and DOUT swings 0V to 3.3V.
How does the pseudo-differential input of ADS7822E/2K5 differ from true differential?
The ADS7822E/2K5 pseudo-differential input samples the voltage difference between +In and –In once at acquisition start and holds it-unlike true differential SAR ADCs that resample –In later in the cycle. The –In pin is limited to –0.2V to +1.0V and is intended for remote ground sensing, not full-range differential signaling. This architecture provides modest common-mode rejection but avoids complexity and cost of dual-track input stages.
What is the purpose of the CS/SHDN pin on ADS7822E/2K5?
The CS/SHDN pin serves dual functions: when driven low, it initiates conversion and enables serial data output on DOUT; when held high, it places ADS7822E/2K5 into full power-down mode, reducing supply current to ≤3μA. This pin is essential for power gating in intermittent-sampling applications and enables precise timing control of acquisition windows.
ADS7822E/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:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- 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:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7822E/2K5 FAQ
1.How can I place an order for ADS7822E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822E/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 ADS7822E/2K5 reliable?
The price and inventory of ADS7822E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7822E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822E/2K5?
ADS7822E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822E/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 ADS7822E/2K5?
For technical support, including ADS7822E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822E/2K5 requirements.
6.How does Aetrix verify that ADS7822E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7822E/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 ADS7822E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7822E/2K5?
All ADS7822E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822E/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 ADS7822E/2K5 part is unused and in its original packaging.
Return procedure for ADS7822E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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