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Texas Instruments ADS7822E/250
- Part No.:
- ADS7822E/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7822E/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:597
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Product details
Overview
ADS7822E/250 from Texas Instruments is a 12-bit, 200kHz sampling SAR analog-to-digital converter with pseudo-differential input, serial CMOS interface, and microPower operation (1.6mW at 200kHz). It operates from 2.7V to 5.25V, features ±2 LSB integral linearity error, and is packaged in MSOP-8 for space-constrained battery-powered data acquisition systems.
For engineers reviewing the ADS7822E/250 datasheet, ADS7822E/250 pinout, ADS7822E/250 application, or ADS7822E/250 equivalent, key selection considerations include its 200kHz throughput rate, 3μA power-down current, pseudo-differential input architecture, reference voltage flexibility (50mV to VCC), and MSOP-8 thermal performance in industrial temperature range (–40°C to +85°C).
Technical Context
The ADS7822E/250 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 12-clock-cycle conversion time and 1.5-clock-cycle acquisition window synchronized to DCLOCK.
Its pseudo-differential input accepts +In and –In signals where –In is fixed (e.g., remote ground sense), not resampled mid-conversion. The synchronous 3-wire serial interface outputs straight-binary 12-bit data MSB-first on DOUT, valid on DCLOCK falling edge, with no pipeline delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 200kHz maximum - supports real-time monitoring of fast transients in sensor interfaces |
| Power Dissipation | 1.6mW at 200kHz - enables continuous operation in energy-harvesting or coin-cell systems |
| Integral Linearity | ±2 LSB - ensures monotonicity and <0.05% full-scale error across operating temperature |
| Reference Range | 50mV to VCC - allows direct use of low-voltage references or rail-to-rail scaling without external dividers |
| Power-Down Current | 3μA max - reduces standby consumption by >500× versus active mode for duty-cycled sensing |
| Supply Range | 2.7V to 5.25V - compatible with single Li-ion, dual AA, or regulated 3.3V/5V rails |
Pinout & Package
ADS7822E/250 is housed in an 8-pin MSOP package (DGK marking, A22 top-side code), optimized for thermal dissipation and PCB area efficiency in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference input | Accepts external reference from 50mV to VCC; sets full-scale span and LSB weight (e.g., 1.22mV/LSB at 5V) |
| 2 +In | Noninverting analog input | Primary signal input; absolute range –0.2V to VCC+0.2V; requires source impedance ≤1kΩ for 12-bit settling |
| 3 –In | Inverting analog input | Pseudo-differential reference point; limited to –0.2V to +1.0V; used for remote ground sensing, not true differential subtraction |
| 4 GND | Analog/digital ground | Single ground pin; requires low-impedance connection to minimize noise coupling into SAR capacitor array |
| 5 CS/SHDN | Chip select / shutdown control | Active-low conversion trigger; high state forces full power-down (3μA), disabling analog and digital sections |
| 6 DOUT | Serial data output | CMOS-compatible output (0V to VCC); drives MSB-first 12-bit straight-binary data synchronized to DCLOCK falling edge |
| 7 DCLOCK | Data clock input | Controls conversion speed and serial timing; supports 10kHz–3.2MHz; min pulse width 125ns (5V) or 400ns (2.7V) |
| 8 +VCC | Power supply | Single 2.7V–5.25V supply powers analog core, reference buffer, and digital interface; bypassing with 0.1μF mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables rejection of common-mode ground shifts up to 1V while maintaining 12-bit accuracy via dedicated –In pin |
| Flexible reference voltage support | Accepts 50mV–VCC reference without external circuitry-ideal for low-voltage sensor bridges or precision current-sense amplifiers |
| Short-cycle conversion capability | Allows early termination after any bit (e.g., 4-bit coarse check) by raising CS, reducing average power by >70% in threshold-triggered applications |
| Low-noise SAR design | 33μVrms input-referred noise and 71dB SINAD enable accurate measurement of sub-mV signals in noisy industrial environments |
| CMOS logic compatibility | Digital I/O tolerates 0–6V logic levels independent of VCC-simplifies interfacing with mixed-voltage microcontrollers and FPGAs |
Applications
| Battery-Powered Remote Sensor Node | Isolated Industrial Signal Conditioning |
|---|---|
|
Use Scenario: Continuous voltage monitoring of distributed temperature sensors powered by CR2032 batteries in wireless HVAC nodes. IC Role / Device Role / Timing Role: Primary ADC capturing thermistor divider outputs at 10Hz–1kHz; enters 3μA power-down between samples. Use Value: 1.6mW active power and short-cycle capability extend battery life beyond 5 years without compromising resolution. |
Use Scenario: Digitizing 4–20mA loop signals in PLC analog input modules with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop voltage; synchronized to isolated SPI clock. Use Value: Pseudo-differential input rejects ground potential differences across isolation barrier, eliminating need for expensive instrumentation amplifiers. |
| Portable Medical Diagnostic Equipment | Simultaneous Multichannel Data Acquisition |
|
Use Scenario: ECG front-end in handheld patient monitors requiring low-power, low-noise analog capture. IC Role / Device Role / Timing Role: High-fidelity digitizer for filtered biopotential signals; referenced to internal 2.5V LDO for stable LSB size. Use Value: 71dB SINAD and 86dB SFDR meet IEC 60601-2-27 requirements for diagnostic-grade waveform fidelity. |
Use Scenario: Synchronized sampling of multiple vibration sensors in predictive maintenance gateways. IC Role / Device Role / Timing Role: One ADS7822E/250 per channel, sharing global DCLOCK and CS for deterministic inter-channel timing. Use Value: 12-clock conversion time and no pipeline delay ensure <100ns inter-channel skew across 4–8 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 | SO-8 package (D marking), identical electrical specs, higher thermal resistance (θJA = 160°C/W vs 145°C/W for MSOP) | Suitable for prototyping or non-space-constrained boards; less optimal for high-density portable designs | Select ADS7822U when SO-8 footprint simplifies layout or rework; verify thermal margin at 200kHz full load |
| ADS7822EB/250 | Enhanced grade: ±1 LSB integral linearity (vs ±2 LSB), same MSOP-8 package and pinout | Required for applications demanding tighter monotonicity, such as closed-loop motor control feedback | Choose ADS7822EB/250 when system-level INL budget is <±1 LSB; no PCB change needed |
Compared with ADS7822U and ADS7822EB/250, the ADS7822E/250 offers the best balance of cost, thermal performance, and production readiness for volume battery-powered instrumentation-retaining full 200kHz capability while delivering ±2 LSB linearity in the smallest footprint.
Availability
ADS7822E/250 is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, isolated signal conditioning, and simultaneous multichannel systems requiring stable component supply across industrial temperature ranges.
Supply support for ADS7822E/250 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 isolated systems-emphasizing microPower operation, flexible reference handling, and robust serial interfacing without sacrificing 12-bit accuracy.
FAQ
What is the maximum sampling rate supported by the ADS7822E/250?
The ADS7822E/250 supports a maximum sampling rate of 200kHz when operated at VCC = 5V and fCLK = 3.2MHz. At lower supply voltages (e.g., 2.7V), the maximum rate drops to 75kHz due to internal timing constraints. This is confirmed in the Electrical Characteristics tables for both +2.7V and +5V conditions in the SBAS062C datasheet.
Does the ADS7822E/250 require an external reference voltage?
Yes, the ADS7822E/250 requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50mV to VCC, which directly defines the full-scale input range and LSB size (e.g., 1.22mV/LSB at 5V reference). No internal reference is provided, and the device does not regulate or buffer the reference input.
How does the pseudo-differential input of the ADS7822E/250 differ from a true differential input?
The ADS7822E/250's pseudo-differential input uses +In and –In pins, but –In is sampled only once at acquisition start and held constant-it is not independently resampled or subtracted during conversion. This architecture rejects slow ground shifts (e.g., remote sensor ground) but does not reject high-frequency common-mode noise like a true differential SAR ADC would.
Can the ADS7822E/250 operate from a 3.3V supply?
Yes, the ADS7822E/250 is fully specified for operation from 2.7V to 5.25V, including standard 3.3V rails. At 3.3V, it achieves 75kHz sampling rate with 1.6mW typical power dissipation and maintains ±2 LSB integral linearity over –40°C to +85°C, as verified in the +2.7V Electrical Characteristics table.
What is the purpose of the CS/SHDN pin on the ADS7822E/250?
The CS/SHDN pin serves dual functions: when pulled low, it initiates conversion and enables serial data output on DOUT; when held high, it places the ADS7822E/250 into full power-down mode, reducing supply current to ≤3μA by disabling both analog and digital circuitry-critical for extending battery life in intermittent-sampling applications.
ADS7822E/250 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 ~ 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:
- -
ADS7822E/250 FAQ
1.How can I place an order for ADS7822E/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822E/250 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/250 reliable?
The price and inventory of ADS7822E/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822E/250 is usually 5 days.
3.What payment methods are accepted for ADS7822E/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822E/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822E/250?
ADS7822E/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822E/250 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/250?
For technical support, including ADS7822E/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822E/250 requirements.
6.How does Aetrix verify that ADS7822E/250 is sourced from the original manufacturer or authorized distributors?
All ADS7822E/250 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/250 meets industry standards.
7.What is the process for return or replacement of ADS7822E/250?
All ADS7822E/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822E/250, 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/250 part is unused and in its original packaging.
Return procedure for ADS7822E/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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