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Texas Instruments ADS7822UC/2K5
- Part No.:
- ADS7822UC/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS7822UC/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,302
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Product details
Overview
ADS7822UC/2K5 from Texas Instruments is a 12-bit, 200kHz pseudo-differential SAR analog-to-digital converter in SO-8 package, operating from 4.75V to 5.25V supply with ±0.75 LSB integral linearity error and 3μA power-down current. It delivers 71dB SINAD at 5VPP/10kHz input and supports serial CMOS interface with DOUT, DCLOCK, and CS/SHDN control - used in isolated data acquisition and battery-powered sensor interfaces.
For engineers reviewing the ADS7822UC/2K5 datasheet, ADS7822UC/2K5 pinout, ADS7822UC/2K5 application, or ADS7822UC/2K5 equivalent, key selection considerations include its SO-8 footprint, 200kHz throughput at 5V, pseudo-differential input range (–In: –0.2V to +1.0V), reference flexibility (50mV to VCC), and micro-power operation down to 3μA shutdown current.
Technical Context
The ADS7822UC/2K5 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6μm CMOS, integrating sample-and-hold functionality. It requires an external reference (50mV–VCC) and external clock (up to 3.2MHz), with conversion initiated by CS falling edge and serial data output MSB-first on DOUT synchronized to DCLOCK falling edges.
Its pseudo-differential input captures voltage difference between +In and –In during hold mode without resampling –In later; –In is limited to –0.2V to +1.0V and serves best for remote ground sensing. Power dissipation scales linearly with sample rate, and full power-down (3μA) occurs only when CS = VCC - digital section remains active during conversion completion idle state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed - enables precise measurement of small signal changes within full-scale span. |
| Throughput Rate | 200kHz at VCC = 5V - supports high-speed sampling in multichannel or real-time monitoring systems. |
| Integral Linearity Error | ±0.75 LSB max - ensures accurate end-point and mid-scale linearity critical for calibration-sensitive applications. |
| Power-Down Current | 3μA max - allows ultra-low standby consumption in battery-operated devices with infrequent sampling. |
| Reference Range | 50mV to VCC - permits flexible scaling of input range (e.g., 50mV LSB = 12.2μV) while maintaining full 12-bit resolution. |
| Analog Input Range | +In: –0.2V to VCC+0.2V; –In: –0.2V to +1.0V - defines safe operating window for pseudo-differential configuration and remote ground sensing. |
| SINAD | 71dB at 5VPP/10kHz - quantifies effective resolution under dynamic conditions, corresponding to ~11.5 ENOB. |
Pinout & Package
ADS7822UC/2K5 is housed in an SO-8 (D package) surface-mount package with standard 150-mil body width and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference input | Accepts external reference voltage from 50mV to VCC; sets full-scale analog input span and LSB weight (e.g., 5V ref → 1.22mV/LSB). |
| +In (Pin 2) | Noninverting analog input | Primary signal input; must remain within –0.2V to VCC+0.2V to maintain linearity and avoid damage. |
| –In (Pin 3) | Inverting analog input | Pseudo-differential reference node; limited to –0.2V to +1.0V - used for remote ground sensing, not true differential subtraction. |
| GND (Pin 4) | Analog/digital ground | Common return for analog inputs, reference, and digital interface; requires low-impedance connection to minimize noise coupling. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; high-level forces full power-down (3μA), disabling both analog and digital sections. |
| DOUT (Pin 6) | Serial data output | CMOS-level output (0V to VCC); transmits 12-bit straight-binary result MSB-first on DCLOCK falling edge. |
| DCLOCK (Pin 7) | Data clock input | Synchronizes serial data transfer; minimum pulse width 125ns at 5V; duty cycle not critical. |
| +VCC (Pin 8) | Power supply | 4.75V–5.25V operation; supplies analog core, reference buffer, and digital interface - bypassing required per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Enables rejection of common-mode noise from remote ground shifts without requiring matched input impedances or dual op-amp front-end. |
| Flexible reference voltage range | Supports 50mV–VCC references - allows optimization of resolution vs. dynamic range (e.g., 100mV ref yields 24.4μV/LSB for low-level sensor signals). |
| Micro-power operation | Consumes only 320–550μA quiescent current at 200kHz sampling - reduces thermal load and extends battery life in portable instrumentation. |
| SO-8 package compatibility | Standard 8-pin SOIC footprint enables drop-in replacement in space-constrained PCB layouts without redesign. |
| CMOS-compatible digital interface | Accepts logic levels up to 6V independent of VCC - simplifies interfacing with mixed-voltage microcontrollers (e.g., 3.3V MCU controlling 5V ADC). |
Applications
| Battery-Powered Sensor Node | Isolated Industrial Data Acquisition |
|---|---|
Use Scenario: Remote temperature/humidity sensor node powered by coin-cell battery, transmitting readings every 10 seconds via BLE. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs; CS/SHDN enables full shutdown between conversions to minimize average current. Use Value: 3μA shutdown current and 200kHz capability allow rapid sampling then deep sleep - extending battery life beyond 5 years. | Use Scenario: High-voltage motor drive monitoring system using opto-isolated SPI interface to acquire phase current and bus voltage. IC Role / Device Role / Timing Role: ADC samples isolated analog signals; pseudo-differential inputs reject ground potential differences across isolation barrier. Use Value: –In input range (–0.2V to +1.0V) accommodates remote ground sense without level-shifting circuitry, reducing BOM count and layout complexity. |
| Simultaneous Multichannel Sampling System | Portable Medical Instrumentation |
Use Scenario: 8-channel ECG front-end where multiple ADS7822UC/2K5 units are time-aligned via shared DCLOCK and staggered CS signals. IC Role / Device Role / Timing Role: Each ADC performs independent 12-bit conversion; serial interface allows daisy-chaining to single MCU SPI port. Use Value: 12-clock-cycle conversion time and deterministic timing enable precise inter-channel synchronization within <100ns skew. | Use Scenario: Handheld blood glucose meter requiring low-noise, low-power analog front-end with 12-bit resolution for electrochemical sensor readout. IC Role / Device Role / Timing Role: ADC digitizes amplified sensor current; reference set to 1.25V for optimal SNR with low-level transducer output. Use Value: 71dB SINAD at 10kHz and 33μVrms noise support accurate detection of sub-microamp current changes in clinical-grade measurements. |
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 |
|---|---|---|---|
| ADS7822UB/2K5 | ±1 LSB integral linearity error (vs. ±0.75 LSB for ADS7822UC/2K5); otherwise identical electrical specs and pinout. | Lower accuracy grade suitable for cost-sensitive industrial monitoring where ±1 LSB linearity suffices. | Select ADS7822UB/2K5 when full 12-bit monotonicity is required but ±1 LSB INL meets system calibration budget. |
| ADS7822U/2K5 | ±2 LSB integral linearity error; same SO-8 package and interface; higher gain/offset error tolerances. | Targeted at general-purpose data logging where absolute accuracy is secondary to power and size constraints. | Choose ADS7822U/2K5 for non-critical sensing applications where cost is primary and ±2 LSB INL is acceptable after system-level calibration. |
Compared with ADS7822UB/2K5 and ADS7822U/2K5, the ADS7822UC/2K5 provides the highest linearity grade (±0.75 LSB) in the same SO-8 footprint - making it optimal for precision sensor interfaces where post-calibration overhead must be minimized.
Availability
ADS7822UC/2K5 is available at Aetrix Electronics and suitable for battery-powered sensor nodes, isolated industrial data acquisition, simultaneous multichannel sampling systems, and portable medical instrumentation requiring stable component supply and long-term production continuity.
Supply support for ADS7822UC/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 company specializing in analog and embedded processing technologies, with decades of leadership in precision data converters and low-power IC design.
The ADS7822 product line was engineered for ultra-low-power, high-resolution data acquisition in space- and energy-constrained systems - emphasizing micro-power operation, flexible reference support, and robust serial interfacing for portable and isolated applications.
FAQ
What is the maximum sampling rate supported by the ADS7822UC/2K5?
The ADS7822UC/2K5 supports a maximum throughput rate of 200kHz when operated at VCC = 5V and fCLK = 3.2MHz. This requires a minimum DCLOCK pulse width of 125ns and is validated across the full –40°C to +85°C temperature range. At lower supply voltages (e.g., 2.7V), the maximum rate drops to 75kHz due to internal timing constraints.
Does the ADS7822UC/2K5 require an external reference voltage?
Yes, the ADS7822UC/2K5 requires an external reference voltage applied to the VREF pin. It accepts any stable reference from 50mV to VCC (5.25V), and this voltage directly determines the full-scale input range and LSB size - for example, a 2.5V reference yields 0.61mV/LSB, while 5V yields 1.22mV/LSB.
How does the pseudo-differential input of the ADS7822UC/2K5 differ from a true differential input?
The ADS7822UC/2K5 pseudo-differential input samples the voltage difference between +In and –In once during hold mode, without resampling –In later in the cycle. Unlike true differential ADCs, it does not reject common-mode signals above the –In input's limited range (–0.2V to +1.0V), making it suitable for remote ground sensing but not high-CMRR applications.
What is the power consumption of the ADS7822UC/2K5 during active conversion?
At VCC = 5V and 200kHz sampling, the ADS7822UC/2K5 draws 320–550μA quiescent current. Power scales linearly with sample rate; at 7.5kHz, consumption drops below 60μW. Full power-down (3μA) is achieved only when CS = VCC - leaving CS low after conversion maintains digital section activity and higher current draw.
Can the ADS7822UC/2K5 interface directly with a 3.3V microcontroller?
Yes, the ADS7822UC/2K5 digital interface is CMOS-compatible and accepts logic inputs up to 6V regardless of VCC. Its DOUT output swings 0V to VCC (5V), so a level shifter or series resistor is recommended when connecting to 3.3V MCU inputs to avoid overstressing the receiving gate - TI recommends a 3kΩ series resistor for safe interfacing.
ADS7822UC/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7822UC/2K5 FAQ
1.How can I place an order for ADS7822UC/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7822UC/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 ADS7822UC/2K5 reliable?
The price and inventory of ADS7822UC/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7822UC/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7822UC/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7822UC/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7822UC/2K5?
ADS7822UC/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7822UC/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 ADS7822UC/2K5?
For technical support, including ADS7822UC/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7822UC/2K5 requirements.
6.How does Aetrix verify that ADS7822UC/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7822UC/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 ADS7822UC/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7822UC/2K5?
All ADS7822UC/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7822UC/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 ADS7822UC/2K5 part is unused and in its original packaging.
Return procedure for ADS7822UC/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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