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Texas Instruments ADS7822EB/250G4
- Part No.:
- ADS7822EB/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7822EB/250G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,677
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Product details
Overview
ADS7822EB/250G4 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, supports external reference voltages from 50mV to VCC, and delivers serial CMOS output via synchronous 3-wire interface - ideal for battery-powered remote data acquisition nodes.
For engineers reviewing the ADS7822EB/250G4 datasheet, ADS7822EB/250G4 pinout, ADS7822EB/250G4 application, or ADS7822EB/250G4 equivalent, key selection criteria include its microPower operation at 7.5–200kHz sample rates, guaranteed ±1 LSB linearity grade, pseudo-differential input architecture, and compatibility with low-noise 2.7V–5.25V systems requiring compact, isolated ADC solutions.
Technical Context
The ADS7822EB/250G4 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6μm CMOS, integrating sample-and-hold functionality. Its conversion cycle requires exactly 12 clock cycles after acquisition, with 1.5 clock cycles dedicated to sampling - enabling deterministic timing and no pipeline delay.
It uses a synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT) where data is output MSB-first on the falling edge of DCLOCK, with a null bit preceding the 12-bit result. The pseudo-differential input (+In/–In) captures voltage difference during hold mode without resampling –– –In is fixed at remote ground or 0V, not actively driven as a true differential pair.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - ensures monotonic transfer function for control-loop feedback. |
| Sampling Rate | Up to 200kHz at VCC = 5V; throughput scales linearly with clock - enables real-time monitoring of fast transients in sensor interfaces. |
| Integral Linearity | ±1 LSB max over –40°C to +85°C - meets precision requirements for calibrated industrial measurement without post-conversion correction. |
| Power Consumption | 1.6mW at 200kHz / 0.54mW at 75kHz / 60μW at 7.5kHz - allows >1-year battery life in 10s-of-Hz wake-up sensing applications. |
| Reference Range | 50mV to VCC - supports flexible scaling: e.g., 100mV ref yields 24.4μV/LSB for high-resolution low-voltage signal capture. |
| Supply Range | 2.7V to 5.25V - interoperable with both 3.3V and 5V logic domains while maintaining full 12-bit performance. |
| Power-Down Current | ≤3μA when CS = VCC - enables ultra-low-quiescent subsystems where ADC spends >99% time in shutdown. |
Pinout & Package
ADS7822EB/250G4 is housed in an MSOP-8 package (DGK marking, 3mm × 3mm footprint, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and isolated measurement modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference input | Accepts external voltage from 50mV to VCC; sets full-scale span and LSB weight (e.g., 2.5V → 0.61mV/LSB). |
| +In | Noninverting analog input | Primary signal input; valid range: GND – 0.2V to VCC + 0.2V - requires buffered source if impedance >1kΩ. |
| –In | Inverting analog input | Pseudo-differential reference node; limited to –0.2V to +1.0V - typically tied to remote ground or local AGND. |
| GND | Analog/digital ground | Single ground pin; must be connected to low-impedance analog ground plane to maintain 71dB SINAD performance. |
| CS/SHDN | Chip select / shutdown control | Active-low conversion trigger; high-level forces full power-down (≤3μA), eliminating standby leakage in sleep modes. |
| DOUT | Serial data output | CMOS-compatible, 0V to VCC swing; outputs 12-bit straight-binary MSB-first after null bit - compatible with SPI master shift registers. |
| DCLOCK | Data clock input | Synchronizes conversion and serial output; min pulse width 400ns (2.7–3.6V) or 125ns (4.75–5.25V); duty cycle noncritical. |
| +VCC | Power supply | Supplies analog and digital sections; bypassing with 0.1μF ceramic + 10μF tantalum required within 5mm for <1 LSB noise. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables rejection of common-mode shifts up to 1V on –In, supporting remote ground sensing in isolated current/voltage monitors. |
| MicroPower sampling at variable rates | Consumes only 0.06mW at 7.5kHz - allows energy harvesting systems to perform periodic measurements without depleting storage. |
| Short-cycle conversion capability | CS can be raised mid-conversion to terminate output after any bit (e.g., 4-bit early exit), reducing average power by >50% in threshold-detection use cases. |
| Wide reference voltage range (50mV–VCC) | Permits direct interfacing with low-output sensors (e.g., thermopiles, strain gauges) without gain amplification - minimizing component count and noise sources. |
| Guaranteed ±1 LSB linearity grade | Eliminates need for factory calibration in medical or industrial instrumentation where absolute accuracy ≤0.025% FS is required. |
Applications
| Battery-Powered Remote Sensor Node | Isolated Current Monitoring |
|---|---|
|
Use Scenario: Wireless environmental sensor collecting temperature/humidity every 10 seconds using coin-cell battery. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs; triggered by MCU GPIO, completes conversion in ≤6μs at 200kHz clock. Use Value: 0.06mW quiescent power at 7.5kHz sample rate extends 220mAh CR2032 battery life beyond 3 years with 99.9% duty-cycled shutdown. |
Use Scenario: DIN-rail mounted energy meter measuring phase currents across opto-isolated shunt amplifiers. IC Role / Device Role / Timing Role: Isolated-side ADC capturing synchronized current samples; referenced to local isolated VREF derived from LDO. Use Value: Pseudo-differential –In input tied to isolated shunt ground rejects common-mode noise from switching power supplies, preserving 12-bit ENOB. |
| Portable Medical Diagnostic Device | Multi-Channel Data Logger |
|
Use Scenario: Handheld ECG module acquiring lead-II signals with 12-bit resolution and clinical-grade linearity. IC Role / Device Role / Timing Role: Front-end ADC for analog signal chain; accepts 2.5V reference from precision bandgap, outputs serial data to ARM Cortex-M0+. Use Value: ±1 LSB integral linearity ensures diagnostic waveform fidelity meets IEC 60601-2-27 requirements without software correction. |
Use Scenario: Industrial vibration logger sampling 4 accelerometer channels at 10kHz using multiplexed inputs. IC Role / Device Role / Timing Role: Shared ADC per channel with analog MUX; short-cycled to 8 bits for rapid threshold detection before full 12-bit capture. Use Value: Short-cycle feature reduces per-sample energy by 67%, enabling 4-channel 10kHz logging for >8 hours on 2000mAh Li-ion pack. |
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 integral linearity, same electrical specs - larger footprint, lower precision grade. | Preferred for prototyping on through-hole or SO boards where MSOP reflow is unavailable; tolerates less stringent linearity requirements. | Select when board assembly process lacks MSOP capability or system accuracy budget allows ±2 LSB INL. |
| ADS7822EC/250 | Same MSOP-8 package, ±0.75 LSB integral linearity, tighter gain/offset error - higher grade, identical pinout and timing. | Required for metrology-grade instruments demanding <0.018% FS absolute accuracy without calibration. | Choose when design requires best-in-class linearity and can justify premium cost for certified measurement traceability. |
Compared with ADS7822U/2K5, ADS7822EB/250G4 offers superior ±1 LSB linearity in a smaller MSOP-8 package but requires fine-pitch reflow; versus ADS7822EC/250, it trades 0.25 LSB linearity for lower cost while retaining identical layout, timing, and power behavior - making it optimal for cost-sensitive industrial sensing.
Availability
ADS7822EB/250G4 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for ADS7822EB/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 decades of expertise in precision data converters and low-power signal chains.
The ADS7822EB/250G4 belongs to TI's precision SAR ADC product line, engineered specifically for ultra-low-power, space-constrained applications including portable instrumentation, remote sensors, and isolated measurement systems.
FAQ
What is the maximum sampling rate supported by the ADS7822EB/250G4?
The ADS7822EB/250G4 supports up to 200kHz sampling rate when operated at VCC = 5V with fCLK = 3.2MHz. At VCC = 2.7V, the maximum reliable throughput drops to 75kHz due to internal timing constraints - confirmed in Electrical Characteristics tables for both supply conditions. The ADS7822EB/250G4 achieves this rate with only 1.6mW power draw.
Does the ADS7822EB/250G4 require an external reference voltage?
Yes, the ADS7822EB/250G4 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50mV to VCC, directly setting the full-scale input range and LSB size (e.g., 2.5V ref → 0.61mV/LSB). No internal reference is provided - reference accuracy and noise directly impact overall system ENOB and offset stability.
How does the pseudo-differential input of the ADS7822EB/250G4 differ from a true differential input?
The ADS7822EB/250G4 pseudo-differential input uses +In and –In pins, but –In is not actively sampled as a complementary signal. Instead, it serves as a fixed reference point (typically tied to remote ground), limiting its voltage range to –0.2V to +1.0V. Unlike true differential ADCs, it cannot reject large common-mode signals - its purpose is single-ended noise rejection in grounded-sensor configurations.
Can the ADS7822EB/250G4 operate from a 3.3V supply?
Yes, the ADS7822EB/250G4 is fully specified for operation from 2.7V to 5.25V, including standard 3.3V rails. At 3.3V, it delivers 75kHz throughput with ±1 LSB integral linearity, 71dB SINAD, and 1.6mW typical power - verified in the +VCC = +2.7V Electrical Characteristics table. Logic levels remain CMOS-compatible with 3.3V controllers.
What is the purpose of the CS/SHDN pin on the ADS7822EB/250G4?
The CS/SHDN pin on the ADS7822EB/250G4 serves dual functions: active-low chip select initiates conversion and enables serial output, while logic-high state forces full power-down mode drawing ≤3μA. This enables precise power gating - for example, holding CS high between samples reduces average current by >99% in low-duty-cycle sensing applications.
ADS7822EB/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:
- 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 ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7822EB/250G4 FAQ
1.How can I place an order for ADS7822EB/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822EB/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 ADS7822EB/250G4 reliable?
The price and inventory of ADS7822EB/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822EB/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7822EB/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822EB/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822EB/250G4?
ADS7822EB/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822EB/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 ADS7822EB/250G4?
For technical support, including ADS7822EB/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822EB/250G4 requirements.
6.How does Aetrix verify that ADS7822EB/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7822EB/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 ADS7822EB/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7822EB/250G4?
All ADS7822EB/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822EB/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 ADS7822EB/250G4 part is unused and in its original packaging.
Return procedure for ADS7822EB/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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