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Texas Instruments ADS7822EB-1/2K5
- Part No.:
- ADS7822EB-1/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
ADS7822EB-1/2K5.pdf
- Description:
- SAR ADC, 12-BIT, SERIAL ACCESS
- Quantity:
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Inventory:10,580
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Product details
Overview
ADS7822EB-1/2K5 from Texas Instruments is a 12-bit, 200kHz pseudo-differential SAR analog-to-digital converter with ±1 LSB integral linearity error, 1.6mW power consumption at full rate, and MSOP-8 package. It operates from 2.7V to 5.25V, features a synchronous serial interface (CS/DCLOCK/DOUT), and targets ultra-low-power data acquisition in battery-operated systems.
For engineers reviewing the ADS7822EB-1/2K5 datasheet, ADS7822EB-1/2K5 pinout, ADS7822EB-1/2K5 application, or ADS7822EB-1/2K5 equivalent, key selection considerations include its guaranteed ±1 LSB INL over –40°C to +85°C, 3μA max power-down current, pseudo-differential input architecture, and compatibility with external references from 50mV to VCC.
Technical Context
The ADS7822EB-1/2K5 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 falling edge, with sampling occurring over 1.5–2.0 clock cycles and fixed 12-cycle conversion time.
Its pseudo-differential input accepts voltage differences between +In and –In (–In limited to –0.2V to +1.0V), enabling remote ground sensing but not true common-mode rejection. Serial output delivers straight-binary 12-bit data MSB-first on DOUT synchronized to DCLOCK falling edges, with no pipeline delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog measurement |
| Sampling Rate | 200kHz maximum - supports high-speed monitoring of fast-changing signals |
| Integral Linearity Error | ±1 LSB - ensures monotonicity and ≤0.024% full-scale deviation across temperature |
| Power Consumption | 1.6mW at 200kHz - enables extended operation in energy-constrained embedded systems |
| Power-Down Current | 3μA max - reduces standby power by >500× versus active mode |
| Reference Range | 50mV to VCC - allows flexible scaling from low-voltage sensor outputs to rail-referenced inputs |
| Supply Voltage | 2.7V to 5.25V - supports direct interfacing with 3.3V and 5V logic domains |
Pinout & Package
ADS7822EB-1/2K5 is housed in an MSOP-8 package (DGK marking, A22 top-side label), with 0.65mm pitch, 3.0mm × 3.0mm body, and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference input | Accepts external reference from 50mV to VCC; sets full-scale span and LSB weight (e.g., 1.22mV/LSB at 5V) |
| +In (Pin 2) | Noninverting analog input | Primary signal input; valid range = GND – 0.2V to VCC + 0.2V |
| –In (Pin 3) | Inverting analog input | Remote ground sense point; limited to –0.2V to +1.0V - not for true differential signaling |
| GND (Pin 4) | Analog/digital ground | Common return for analog inputs, reference, and digital I/O; requires low-impedance connection |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low initiation of conversion; high = full power-down (3μA) |
| DOUT (Pin 6) | Serial data output | CMOS-level output (0V to VCC); MSB-first, straight-binary, tri-statable after transfer |
| DCLOCK (Pin 7) | Data clock input | Synchronizes serial bit transfer; falling edge clocks valid data; min pulse width = 125ns at 5V |
| +VCC (Pin 8) | Power supply | Single supply for analog and digital sections; bypassing with 0.1μF ceramic required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables remote ground sensing via –In pin while maintaining 12-bit resolution and ±1 LSB linearity |
| Synchronous 3-wire serial interface | Eliminates need for parallel bus or complex timing control; compatible with SPI-compatible controllers |
| Wide reference voltage range (50mV–VCC) | Permits direct digitization of low-level sensor outputs without gain amplification |
| Ultra-low quiescent current (200μA at 75kHz) | Reduces system-level power budget in portable instrumentation and wireless sensor nodes |
| Short-cycle conversion capability | Allows early termination after n bits (e.g., 4–8) to save power when full 12-bit precision is unnecessary |
Applications
| Battery-Powered Data Loggers | Isolated Sensor Interfaces |
|---|---|
Use Scenario: Continuous voltage/current monitoring in handheld environmental sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 1–10kHz with adaptive sampling to extend battery life. Use Value: 3μA power-down current and short-cycle conversion reduce average system current to <10μA during idle periods. |
Use Scenario: Signal conditioning in industrial current-loop transmitters with galvanic isolation between field and control sides. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing conditioned sensor signals before transmission across optocoupler or digital isolator. Use Value: Pseudo-differential input rejects ground potential shifts across isolation barrier while maintaining ±1 LSB accuracy. |
| Remote Telemetry Modules | Simultaneous Multichannel Acquisition |
Use Scenario: Wireless node collecting temperature, humidity, and pressure from multiple sensors in agricultural IoT deployments. IC Role / Device Role / Timing Role: Low-power ADC serving as front-end for microcontroller-based edge processing prior to RF transmission. Use Value: 1.6mW active power and MSOP-8 footprint enable compact, thermally efficient PCB layout in space-constrained enclosures. |
Use Scenario: Synchronized sampling of motor phase currents in brushless DC drives using multiple ADS7822EB-1/2K5 units. IC Role / Device Role / Timing Role: One per channel, sharing common DCLOCK and CS to ensure deterministic inter-channel timing alignment. Use Value: Fixed 12-cycle conversion time and no pipeline latency guarantee consistent sample-to-sample skew <10ns across channels. |
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 | SO-8 package; ±2 LSB INL (vs. ±1 LSB for ADS7822EB-1/2K5); same electrical specs | Preferred where board-level rework tolerance or hand-soldering is required; less suitable for high-density layouts | Select when mechanical robustness or legacy SO-8 footprint compatibility outweighs precision requirement |
| ADS7822EC/2K5 | MSOP-8 package; ±0.75 LSB INL; tighter gain/offset error specs; identical pinout and timing | Required for metrology-grade measurements where sub-LSB linearity is critical | Choose when system-level accuracy demands <±0.75 LSB INL and cost premium is acceptable |
Compared with ADS7822U/2K5, ADS7822EB-1/2K5 offers higher precision in the same compact MSOP-8 form factor; compared with ADS7822EC/2K5, it provides a balanced trade-off of cost, size, and ±1 LSB linearity for industrial sensing where ultimate metrology is not required.
Availability
ADS7822EB-1/2K5 is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated sensor interfaces, and remote telemetry modules requiring stable component supply and guaranteed long-term manufacturability.
Supply support for ADS7822EB-1/2K5 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 ADS7822EB-1/2K5 belongs to TI's precision SAR ADC product line, engineered specifically for ultra-low-power, high-accuracy data acquisition in portable and isolated industrial systems.
FAQ
What is the guaranteed integral linearity error for ADS7822EB-1/2K5 over temperature?
The ADS7822EB-1/2K5 guarantees ±1 LSB integral linearity error across the full operating temperature range of –40°C to +85°C, as specified in the Electrical Characteristics table for the 'B' grade device. This performance is validated under standard test conditions with VCC = 2.7V or 5V and applies to both MSOP-8 and SO-8 variants bearing the 'B' suffix. The ADS7822EB-1/2K5 maintains this specification without derating.
Can ADS7822EB-1/2K5 operate with a 2.0V supply voltage?
No, ADS7822EB-1/2K5 is not specified for reliable operation at 2.0V. Its minimum supply voltage for guaranteed performance is 2.7V, as defined in the Recommended Operating Conditions table. While the Absolute Maximum Ratings list 2.0V as an absolute limit, the Electrical Characteristics-including sampling rate, linearity, and power consumption-are only ensured from 2.7V to 5.25V. Using 2.0V may result in undefined behavior or failure to meet datasheet specifications.
How does the pseudo-differential input of ADS7822EB-1/2K5 differ from a true differential input?
The ADS7822EB-1/2K5 pseudo-differential input samples the voltage difference between +In and –In once at acquisition, but does not reject common-mode signals beyond the limited –In input range (–0.2V to +1.0V). Unlike true differential ADCs, it lacks matched input paths and common-mode rejection ratio (CMRR) specification. The –In pin is intended for remote ground sensing-not for rejecting noise shared by both inputs-and must remain within its restricted voltage window to maintain linearity.
What is the minimum DCLOCK pulse width required for ADS7822EB-1/2K5 at 5V supply?
At VCC = 5V, the minimum DCLOCK high and low times for ADS7822EB-1/2K5 are each 125ns, as specified in the Timing Specifications table. This corresponds to a maximum clock frequency of 4MHz (50% duty cycle). The device remains functional outside this range, but timing margins-particularly thDO (15ns) and tdDO (85–150ns)-are only guaranteed when pulse widths meet or exceed 125ns. Violating this spec risks metastability or invalid data on DOUT.
Does ADS7822EB-1/2K5 support daisy-chained serial communication?
No, ADS7822EB-1/2K5 does not support daisy-chained operation. Its serial interface is strictly point-to-point: one CS line controls one device, and DOUT provides data only for that unit. The datasheet specifies no provision for cascading multiple ADS7822EB-1/2K5 devices on a shared DOUT line. For multichannel systems, separate CS lines or external multiplexing is required-unlike SPI daisy-chain capable ADCs with dedicated DOUT/DIN pairs.
ADS7822EB-1/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
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- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
ADS7822EB-1/2K5 FAQ
1.How can I place an order for ADS7822EB-1/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822EB-1/2K5 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 ADS7822EB-1/2K5 reliable?
The price and inventory of ADS7822EB-1/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822EB-1/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7822EB-1/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822EB-1/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822EB-1/2K5?
ADS7822EB-1/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822EB-1/2K5 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 ADS7822EB-1/2K5?
For technical support, including ADS7822EB-1/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822EB-1/2K5 requirements.
6.How does Aetrix verify that ADS7822EB-1/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7822EB-1/2K5 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 ADS7822EB-1/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7822EB-1/2K5?
All ADS7822EB-1/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822EB-1/2K5, 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 ADS7822EB-1/2K5 part is unused and in its original packaging.
Return procedure for ADS7822EB-1/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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