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Texas Instruments ADS7824UB/1K
- Part No.:
- ADS7824UB/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7824UB/1K.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,410
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Product details
Overview
ADS7824UB/1K from Burr-Brown (now Texas Instruments) is a 12-bit, 4-channel sampling analog-to-digital converter with successive approximation architecture, ±10V input range, parallel/serial dual-output interface, and internal +2.5V reference. It achieves 25µs max complete conversion cycle, ±0.5 LSB max INL/DNL, and operates from single +5V supply across –40°C to +85°C - used in industrial data acquisition systems requiring multiplexed precision digitization of bipolar sensor signals.
For engineers reviewing the ADS7824UB/1K datasheet, ADS7824UB/1K pinout, ADS7824UB/1K application, or ADS7824UB/1K equivalent, key selection considerations include its 4-channel ±10V multiplexer, dual-mode (parallel/serial) microprocessor interface, continuous conversion mode, power-down capability (50µW), and SOIC-28 package compatibility with industrial temperature operation.
Technical Context
The ADS7824UB/1K integrates a 4-channel analog multiplexer, track-and-hold amplifier, 12-bit SAR ADC core, internal +2.5V reference buffer (CAP/REF pins), and configurable digital interface supporting both parallel byte-access (D0–D7, BYTE control) and serial output (SDATA/DATACLK/SYNC/TAG). Its CONTC pin enables autonomous cycling through AIN0–AIN3 in continuous mode.
Conversion is initiated via CS/R/C edge-triggered control; BUSY indicates active conversion; PWRD enables 50µW standby; PAR/SER selects output mode; EXT/INT configures DATACLK as input or output. Internal laser-trimmed resistors ensure ±0.1% channel-to-channel matching and stable ±10V full-scale range without external scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88mV LSB step size over ±10V range for high-fidelity sensor digitization |
| Throughput Rate | 40kHz - supports real-time sampling of dynamic industrial signals with 25µs max acquire+convert cycle |
| DC Accuracy | ±0.5 LSB max INL/DNL - ensures monotonicity and <0.012% full-scale linearity error in closed-loop control |
| Analog Input Range | ±10V - directly interfaces with industrial transducers, strain gauges, and bipolar op-amp outputs without level-shifting |
| Power Dissipation | 50mW active / 50µW power-down - enables thermally constrained embedded designs with low idle consumption |
| Operating Temperature | –40°C to +85°C - fully specified for harsh industrial environments including factory automation and motor drives |
| Reference | +2.5V internal (±0.25% initial accuracy, ±7ppm/°C drift) - eliminates external reference component count while maintaining stability |
Pinout & Package
ADS7824UB/1K is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package, 217 mil width, with standard 0.050" lead pitch and gull-wing leads - compatible with automated SMT assembly and IPC-7351B footprint IPC-7351B SOIC28_217.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | 4-channel analog inputs | Bipolar ±10V inputs with 45.7kΩ on/off impedance; internally multiplexed to SAR core |
| REF / CAP | Reference I/O and buffer output | REF outputs +2.5V nominal; CAP requires 2.2µF tantalum to AGND2 for stability |
| D0–D7, BYTE | Parallel data bus and byte select | D0–D7 tri-state outputs; BYTE toggles between MSB (LOW) and LSB (HIGH) bytes in parallel mode |
| SDATA / DATACLK / SYNC / TAG | Serial interface signals | SDATA outputs 12-bit two's complement MSB-first; DATACLK is input (EXT/INT=HIGH) or output (EXT/INT=LOW); SYNC pulses before data; TAG inputs serial tag bits synchronized to clock |
| CS / R/C / PAR/SER / CONTC / PWRD | Digital control inputs | CS+R/C initiate conversion; PAR/SER selects parallel/serial mode; CONTC enables auto-channel cycling; PWRD halts conversion and cuts power to 50µW |
| BUSY | Conversion status indicator | Active-low open-drain output; falls at conversion start, rises when data is latched - used as read-strobe in parallel mode |
| VS1 / VS2 / AGND1 / AGND2 / DGND | Power and ground terminals | Dual analog supplies (VS1/VS2 tied) and separate analog/digital grounds minimize noise coupling in mixed-signal systems |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel ±10V multiplexer | Enables compact multi-sensor monitoring (e.g., temperature, pressure, current) without external MUX or signal conditioning |
| Parallel + serial dual interface | Supports legacy 8-bit microcontrollers (parallel) and space-constrained or low-pin-count designs (serial), reducing BOM and layout flexibility |
| Continuous conversion mode | Automatically sequences AIN0→AIN3 with no host CPU intervention - ideal for background data logging in PLCs and DAQ modules |
| Laser-trimmed resistor network | Guarantees ±0.1% channel-to-channel gain matching and stable ±10V full-scale range across temperature and life |
| 50µW power-down state | Allows integration into battery-backed or energy-harvesting systems where periodic wake-up sampling is required |
Applications
| Industrial Process Monitoring | Motor Drive Current Sensing |
|---|---|
Use Scenario: Real-time acquisition of four analog process variables (e.g., flow, pressure, temperature, pH) in chemical plant DCS cabinets. IC Role / Device Role / Timing Role: 4-channel SAR ADC with integrated MUX and ±10V input - performs synchronized sampling under host MCU control or autonomous CONTC mode. Use Value: Eliminates need for external signal conditioning and discrete MUX; 25µs conversion enables >30Hz per-channel update rate within 125ms control loop windows. | Use Scenario: Isolated phase current measurement in 3-phase inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Bipolar-input ADC digitizing ±10V amplifier outputs representing motor phase currents - referenced to system AGND2 with separate DGND isolation. Use Value: ±0.5 LSB INL ensures accurate torque calculation; 40kHz throughput supports field-oriented control (FOC) algorithms with minimal current-sensing latency. |
| Programmable Logic Controller (PLC) Analog Input Module | Test & Measurement Equipment Front-End |
Use Scenario: Modular 4-channel analog input card for DIN-rail mounted PLCs handling 4–20mA, ±10V, and thermocouple inputs via external conditioning. IC Role / Device Role / Timing Role: Precision digitizer interfacing to programmable gain instrumentation amps - leverages internal +2.5V reference and robust ESD protection (per ABSOLUTE MAXIMUM RATINGS). Use Value: SOIC-28 package fits high-density I/O modules; –40°C to +85°C rating ensures reliability in uncontrolled cabinet environments. | Use Scenario: Portable multichannel data logger capturing vibration, acoustic, and thermal signatures during equipment commissioning. IC Role / Device Role / Timing Role: Low-power 12-bit ADC operating in PWRD mode between triggered acquisitions - powered from USB or Li-ion battery. Use Value: 50µW standby extends battery life; serial interface reduces interconnect complexity; 72dB SFDR supports >10-bit effective resolution in noisy lab settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 4-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7825UB/1K | 16-bit resolution, same pinout and interface, higher power (75mW), ±0.5 LSB INL at 16-bit | Used where higher resolution is critical (e.g., precision calibration equipment); not drop-in due to increased settling time and drive strength requirements | Select ADS7825UB/1K only if 16-bit resolution is mandatory and system timing budget allows longer acquisition |
| AD7894AR-10 | 14-bit, single-channel, ±10V input, SPI interface only, no internal reference, 30µs conversion | Suited for point-measurement systems; lacks multiplexer and parallel interface - requires external MUX and level-shifting for multi-channel use | Choose AD7894AR-10 for cost-sensitive, single-sensor applications where SPI simplifies MCU integration and board space is limited |
Compared with ADS7824UB/1K, ADS7825UB/1K offers higher resolution but demands more power and timing margin, while AD7894AR-10 reduces channel count and interface flexibility to achieve smaller footprint and lower cost - making ADS7824UB/1K the optimal balance of multi-channel capability, dual-interface support, and industrial-grade specifications.
Availability
ADS7824UB/1K is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, and PLC analog input modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS7824UB/1K 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs including data converters, amplifiers, and references - known for laser-trimming, low-noise design, and industrial temperature qualification.
The ADS7824UB/1K belongs to Burr-Brown's legacy SAR ADC product line designed for high-accuracy, multi-channel data acquisition in factory automation, test equipment, and embedded control systems demanding ±10V bipolar input and flexible microprocessor interfacing.
FAQ
What is the maximum sampling rate supported by the ADS7824UB/1K?
The ADS7824UB/1K supports a maximum throughput rate of 40kHz, corresponding to a 25µs maximum complete cycle (acquisition + conversion). This is achievable with external clocking and proper timing margins; in continuous conversion mode, it cycles through all four channels at up to 10kHz per channel.
Does the ADS7824UB/1K require an external reference voltage?
No - the ADS7824UB/1K includes an internal +2.5V reference with ±0.25% initial accuracy and ±7ppm/°C drift. REF and CAP pins must be bypassed with a 2.2µF tantalum capacitor to AGND2. An external reference (2.3V–2.7V) may be used for improved stability, but is not required.
How does the continuous conversion mode (CONTC = HIGH) operate on the ADS7824UB/1K?
When CONTC is driven HIGH, the ADS7824UB/1K autonomously sequences conversions across AIN0 → AIN1 → AIN2 → AIN3 repeatedly, provided CS, R/C, and PWRD remain LOW. Channel address pins A0/A1 become outputs reflecting the active channel, and BUSY pulses indicate each conversion completion.
Can the ADS7824UB/1K interface directly with a microcontroller lacking a parallel bus?
Yes - the ADS7824UB/1K supports native serial output via SDATA, DATACLK, SYNC, and TAG pins. With PAR/SER = LOW and EXT/INT = HIGH, it accepts an external clock (up to 10MHz) and outputs 12-bit two's complement data MSB-first, enabling connection to SPI-capable MCUs or FPGAs with minimal GPIO usage.
What is the purpose of the TAG pin on the ADS7824UB/1K?
The TAG pin on the ADS7824UB/1K is a serial data input synchronized to the DATACLK signal (internal or external). Each rising/falling edge clocks one bit into the device; the first TAG bit appears on SDATA after 14 DATACLK edges - used for auxiliary metadata tagging, channel identification, or synchronization in multi-ADC systems.
ADS7824UB/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7824UB/1K FAQ
1.How can I place an order for ADS7824UB/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7824UB/1K 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 ADS7824UB/1K reliable?
The price and inventory of ADS7824UB/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7824UB/1K is usually 5 days.
3.What payment methods are accepted for ADS7824UB/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7824UB/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7824UB/1K?
ADS7824UB/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7824UB/1K 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 ADS7824UB/1K?
For technical support, including ADS7824UB/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7824UB/1K requirements.
6.How does Aetrix verify that ADS7824UB/1K is sourced from the original manufacturer or authorized distributors?
All ADS7824UB/1K 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 ADS7824UB/1K meets industry standards.
7.What is the process for return or replacement of ADS7824UB/1K?
All ADS7824UB/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7824UB/1K, 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 ADS7824UB/1K part is unused and in its original packaging.
Return procedure for ADS7824UB/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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