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Texas Instruments ADS7822E/2K5G4
- Part No.:
- ADS7822E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7822E/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
ADS7822E/2K5G4 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with pseudo-differential input, serial CMOS interface, and microPower operation (1.6mW at full rate). It features ±2 LSB integral linearity, 3μA max power-down current, and operates from 2.7V to 5.25V - designed for precision battery-powered data acquisition.
For engineers reviewing the ADS7822E/2K5G4 datasheet, ADS7822E/2K5G4 pinout, ADS7822E/2K5G4 application, or ADS7822E/2K5G4 equivalent, key selection criteria include its MSOP-8 package, 12-bit resolution with guaranteed no missing codes, 75–200kHz throughput scalability, and reference voltage flexibility (50mV to VCC).
Technical Context
The ADS7822E/2K5G4 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.
It uses a synchronous 3-wire serial interface (CS/SHDN, DCLOCK, DOUT), outputting straight-binary 12-bit data MSB-first on DOUT's falling clock edge. The pseudo-differential input (+In/–In) supports remote ground sensing but does not resample –In during hold - limiting –In range to –0.2V to +1.0V while +In spans GND–0.2V to VCC+0.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonic transfer function for control-loop feedback. |
| Throughput Rate | 75 kHz (at VCC = 2.7V) or 200 kHz (at VCC = 5V) - selectable via clock frequency; enables real-time sensor monitoring. |
| Integral Linearity Error | ±2 LSB max - defines end-point accuracy over full-scale range; critical for calibrated measurement systems. |
| Power Consumption | 1.6 mW at 200 kHz / 0.54 mW at 75 kHz - ultra-low active power supports multi-year battery life in portable instruments. |
| Power-Down Current | 3 μA max - allows rapid entry/exit from low-power state without reset or reinitialization overhead. |
| Reference Range | 50 mV to VCC - permits flexible scaling (e.g., 2.5V or 5V reference) and direct interfacing with low-voltage sensors. |
| Analog Input Type | Pseudo-differential (+In/–In) - supports single-ended or differential sensing with remote ground compensation. |
Pinout & Package
ADS7822E/2K5G4 is housed in an MSOP-8 package (DGK marking, 3.0 mm × 3.0 mm footprint, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference input | Defines full-scale span (0 to VREF); accepts 50 mV–VCC; high-impedance (>5 GΩ) when CS = VCC. |
| +In | Noninverting analog input | Primary signal input; valid range: GND–0.2V to VCC+0.2V; 25 pF capacitance requires low-Z source. |
| –In | Inverting analog input | Remote ground sense point; limited range (–0.2V to +1.0V); not resampled - sets common-mode baseline. |
| GND | Analog/digital ground | Single ground plane required; separates analog and digital return paths only if layout isolation is implemented. |
| CS/SHDN | Chip select / shutdown control | Falling edge initiates conversion; high level forces full power-down (3 μA), disabling analog and digital sections. |
| DOUT | Serial data output | CMOS-level (0V to VCC), MSB-first, tri-state after LSB; timing referenced to DCLOCK falling edge. |
| DCLOCK | Data clock input | Synchronizes sampling and serial output; min pulse width 125 ns (5V) or 400 ns (2.7V); duty cycle flexible. |
| +VCC | Power supply | 2.7V–5.25V operation; supplies analog core, reference buffer, and digital interface; bypassing essential. |
Key Features
| Feature | Design Value |
|---|---|
| MicroPower operation | 1.6 mW at 200 kHz enables >5-year battery life in 100-μA average-current systems. |
| Pseudo-differential input | Supports remote ground sensing without dedicated instrumentation amplifier - reduces BOM count in isolated sensor nodes. |
| Flexible reference voltage | 50 mV–VCC range allows direct use of low-noise LDO outputs or sensor-specific references without external scaling. |
| Short-cycling capability | CS high terminates conversion mid-stream - saves power when partial-resolution data suffices (e.g., threshold detection). |
| Wide supply range | 2.0V–5.25V operation supports legacy 3.3V/5V systems and emerging low-voltage energy-harvesting platforms. |
Applications
| Battery-Operated Portable Meters | Remote Sensor Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter acquiring voltage, current, and temperature readings with 12-bit precision and multi-year battery life. IC Role / Device Role / Timing Role: Primary ADC capturing analog front-end signals; samples at 75 kHz during active measurement, enters 3 μA power-down between readings. Use Value: 1.6 mW active power and 3 μA shutdown enable >5-year CR2032 battery operation without compromising resolution or linearity. |
Use Scenario: Wireless environmental node measuring temperature, humidity, and gas concentration in industrial field locations. IC Role / Device Role / Timing Role: Low-power ADC interfacing with analog sensors; triggered by MCU on scheduled intervals or event-driven wake-up. Use Value: Pseudo-differential inputs reject ground shift across long sensor cables; MSOP-8 footprint minimizes PCB area in compact enclosures. |
| Isolated Analog Monitoring | Simultaneous Multichannel Sampling Systems |
Use Scenario: Medical patient monitor isolating ECG/EEG signals using optocouplers or digital isolators before digitization. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned biopotential signals; powered locally, referenced to isolated ground. Use Value: 50 mV–VCC reference flexibility allows matching isolated LDO output; 25 pF input capacitance simplifies anti-alias filter design. |
Use Scenario: Motor drive controller sampling phase currents and bus voltage concurrently across three channels. IC Role / Device Role / Timing Role: One ADS7822E/2K5G4 per channel (or multiplexed) providing synchronized 12-bit samples for FOC algorithms. Use Value: 200 kHz throughput supports 10–20 kHz PWM switching harmonics capture; short-cycling reduces latency for overcurrent fault detection. |
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 (D marking), same electrical specs, 100-unit rail packaging vs. 2500-unit tape-and-reel. | Preferred for prototyping or low-volume production where SO-8 hand-soldering or socketing is needed. | Select ADS7822U/2K5 when board space allows larger SO-8 footprint and volume requirements are <500 units. |
| ADS7822EB/2K5 | Enhanced grade: ±1 LSB integral linearity (vs. ±2 LSB), identical package and pinout. | Required for metrology-grade calibration, high-accuracy sensor fusion, or closed-loop control demanding tighter INL. | Choose ADS7822EB/2K5 when system-level accuracy mandates sub-2 LSB INL - adds cost but retains full compatibility. |
Compared with ADS7822U/2K5, ADS7822E/2K5 offers smaller MSOP-8 size and higher reel quantity; versus ADS7822EB/2K5, it trades ±1 LSB INL for lower cost while maintaining identical timing, power, and interface behavior - making ADS7822E/2K5 optimal for cost-sensitive, space-constrained industrial data loggers.
Availability
ADS7822E/2K5G4 is available at Aetrix Electronics and suitable for battery-operated portable meters, remote sensor data acquisition, isolated analog monitoring, and simultaneous multichannel sampling systems requiring stable component supply and long-term manufacturability.
Supply support for ADS7822E/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 low-power design.
The ADS7822 product line was engineered for ultra-low-power, high-resolution data acquisition in portable and remote applications - prioritizing microPower efficiency, small footprint, and flexible reference architecture without sacrificing 12-bit linearity.
FAQ
What is the maximum sampling rate supported by the ADS7822E/2K5G4?
The ADS7822E/2K5G4 achieves up to 200 kHz throughput when operated at VCC = 5V with fCLK = 3.2 MHz. At VCC = 2.7V, the maximum rate is 75 kHz due to internal timing constraints. Both rates are fully specified with guaranteed 12-bit performance and ±2 LSB INL.
Does the ADS7822E/2K5G4 require an external reference voltage?
Yes, the ADS7822E/2K5G4 requires an external reference applied to the VREF pin. It accepts any stable voltage from 50 mV to VCC, directly setting the full-scale input range. No internal reference is provided - enabling precise matching to sensor output or system rail voltages.
Can the ADS7822E/2K5G4 operate from a 3.3V supply?
Yes, the ADS7822E/2K5G4 is fully specified for operation from 2.7V to 5.25V. At 3.3V, it delivers 75 kHz throughput with 1.6 mW typical power consumption and maintains ±2 LSB integral linearity across –40°C to +85°C.
What is the purpose of the –In pin on the ADS7822E/2K5G4?
The –In pin enables pseudo-differential input mode, allowing remote ground sensing to reject small common-mode shifts. Its voltage must stay within –0.2V to +1.0V; it is sampled once at conversion start and not resampled - making it ideal for referencing sensor ground away from noisy PCB planes.
How does the power-down mode work on the ADS7822E/2K5G4?
Power-down is activated by driving CS/SHDN high, reducing supply current to ≤3 μA. Both analog and digital sections are disabled - including reference buffer and serial interface. Full functionality resumes within one DCLOCK cycle after CS falls, with no initialization delay required for ADS7822E/2K5G4.
ADS7822E/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:
- 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/2K5G4 FAQ
1.How can I place an order for ADS7822E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822E/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 ADS7822E/2K5G4 reliable?
The price and inventory of ADS7822E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7822E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822E/2K5G4?
ADS7822E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822E/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 ADS7822E/2K5G4?
For technical support, including ADS7822E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822E/2K5G4 requirements.
6.How does Aetrix verify that ADS7822E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7822E/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 ADS7822E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7822E/2K5G4?
All ADS7822E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822E/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 ADS7822E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7822E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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