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Texas Instruments ADS7824U/1K
- Part No.:
- ADS7824U/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7824U/1K.pdf
- Description:
- ADS7824 4-CHANNEL, 12-BIT SAMPLI
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
ADS7824U/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 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 - used in industrial data acquisition systems requiring multiplexed precision digitization of bipolar sensor signals.
For engineers reviewing the ADS7824U/1K datasheet, ADS7824U/1K pinout, ADS7824U/1K application, or ADS7824U/1K equivalent, key selection criteria include its 28-pin SOIC package, continuous conversion mode, dual-output interface flexibility, ±10V channel-multiplexed input capability, and guaranteed no missing codes over –40°C to +85°C.
Technical Context
The ADS7824U/1K integrates a 4-channel analog multiplexer, track-and-hold amplifier, 12-bit SAR ADC core, internal trimmed ±10V scaling resistors, and on-chip +2.5V reference buffer. Its control logic supports both CS/R/C–triggered discrete conversions and CONTC–enabled continuous cycling across all four channels.
It provides two mutually exclusive output modes: 8-bit+4-bit parallel (via D0–D7, BYTE-selectable) or 12-bit serial (MSB-first on SDATA, clocked by internal DATACLK or external source), with BUSY signaling conversion status and PWRD enabling 50µW power-down state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4.88mV LSB step size for ±10V full-scale range |
| Input Range | ±10V bipolar - supports direct connection to industrial transducers without external level-shifting |
| Throughput Rate | 40kHz - enables real-time sampling of signals up to 90kHz useable bandwidth |
| DC Accuracy | ±0.5 LSB max INL/DNL - ensures monotonicity and <0.012% full-scale linearity error |
| Power Dissipation | 50mW active / 50µW power-down - suitable for thermally constrained embedded systems |
| Operating Temp | –40°C to +85°C - fully specified for industrial-grade reliability without derating |
| Reference | +2.5V internal (±0.25% initial accuracy, ±5ppm/°C drift) - eliminates need for external reference IC |
Pinout & Package
ADS7824U/1K is housed in a 28-pin SOIC (Package Drawing 217), 0.300" wide, with standard JEDEC MS-012AC footprint and thermal resistance θJA = 75°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog Input Channels | Four independent ±10V inputs; laser-trimmed for ±0.1% channel-to-channel gain matching |
| REF / CAP | Reference Output & Buffer Node | Outputs +2.5V nominal; requires 2.2µF tantalum bypass to AGND2 for stability and accuracy |
| D0–D7, BYTE | Parallel Data Interface | Tri-state 8-bit bus; BYTE selects MSB byte (LOW) or LSB nibble (HIGH) for 12-bit readout |
| SDATA / DATACLK / EXT/INT / SYNC / TAG | Serial Interface Signals | Supports internal clock (EXT/INT = LOW) or external clock (EXT/INT = HIGH); SYNC marks frame start; TAG enables bidirectional serial tagging |
| R/C / CS / CONTC / PWRD | Control Inputs | R/C initiates hold-and-convert; CS enables output; CONTC enables auto-sequencing; PWRD halts conversion and cuts power |
| BUSY | Status Output | Active-low open-drain signal indicating conversion in progress; rising edge latches valid parallel data |
| AGND1 / AGND2 / DGND | Ground Terminals | Separate analog/digital grounds with ≤0.3V max potential difference - critical for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade path | Direct replacement for ADS7825 in 28-pin DIP/SOIC footprints - simplifies migration to 12-bit resolution |
| Continuous conversion mode | Automatically cycles through AIN0–AIN3 when CONTC = HIGH - eliminates host CPU polling overhead |
| Dual-output interface | Single device supports either microprocessor parallel bus or low-pin-count serial link - reduces BOM and layout complexity |
| Laser-trimmed input scaling | Guarantees ±0.1% channel-to-channel gain match and ±10V range without external resistor networks |
| Low-power operation | 50µW standby current enables battery-backed or energy-harvesting DAQ designs without sacrificing speed or accuracy |
Applications
| Industrial PLC Analog Input Module | Test & Measurement Digitizer |
|---|---|
Use Scenario: Digitizing 4 channels of ±10V industrial sensor outputs (e.g., strain gauges, RTDs, 4–20mA loop receivers) within a programmable logic controller rack. IC Role / Device Role / Timing Role: Primary ADC front-end with integrated multiplexer and reference - performs synchronized sampling and conversion under PLC scan-cycle timing constraints. Use Value: Eliminates external op-amps, reference ICs, and multiplexer drivers; ±0.1% channel matching ensures consistent calibration across all I/O slots. | Use Scenario: Portable handheld multimeter or benchtop data logger capturing transient waveforms from multiple sensors simultaneously. IC Role / Device Role / Timing Role: High-fidelity sampling engine with 40kHz throughput and 72dB SNR - captures fast-changing signals while maintaining DC accuracy. Use Value: Internal +2.5V reference and laser-trimmed resistors enable <±0.5 LSB error without factory recalibration; SOIC package supports compact PCB layout. |
| Motor Drive Current Feedback System | Medical Patient Monitor Signal Chain |
Use Scenario: Real-time monitoring of phase currents in 3-phase inverter drives using isolated shunt amplifiers feeding ±10V ADC inputs. IC Role / Device Role / Timing Role: Precision current digitizer operating in continuous conversion mode - acquires AIN0–AIN2 at fixed intervals synchronized to PWM carrier. Use Value: 25µs max conversion time allows >30k samples/sec per channel; 90dB channel separation prevents crosstalk between high-di/dt current paths. | Use Scenario: Multi-parameter vital sign acquisition (ECG, respiration, temperature) in portable patient monitors requiring low power and clinical-grade linearity. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC subsystem - digitizes conditioned biopotential signals with minimal added quantization error. Use Value: 50µW power-down mode extends battery life during idle periods; ±0.5 LSB INL meets IEC 60601-2-27 linearity requirements for diagnostic ECG. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multiplexed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7824UB | Same SOIC package but ±0.5 LSB INL grade (vs. ±1 LSB for ADS7824U) | Required where tighter DC linearity is mandated (e.g., calibration equipment) | Select ADS7824UB if system-level INL budget demands <±0.5 LSB; otherwise ADS7824U meets general industrial specs. |
| ADS8320IB | 16-bit SAR, SPI-only interface, no internal reference, 200kSPS throughput | Higher resolution needed, but requires external reference and dedicated SPI controller | Choose ADS8320IB only when 16-bit resolution justifies added BOM cost and interface redesign; ADS7824U/1K retains parallel/serial flexibility and integrated reference. |
Compared with ADS7824UB and ADS8320IB, the ADS7824U/1K uniquely balances 12-bit precision, dual-output interface, integrated ±10V scaling, and industrial temperature support in a single 28-pin SOIC - making it optimal for cost-sensitive, space-constrained DAQ modules where design reuse and supply chain continuity matter.
Availability
ADS7824U/1K is available at Aetrix Electronics and suitable for industrial PLC analog input modules, test & measurement digitizers, motor drive current feedback systems, and medical patient monitor signal chains requiring stable component supply and long-term lifecycle support.
Supply support for ADS7824U/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 signal conditioning and data conversion ICs for industrial, instrumentation, and medical applications.
The ADS7824U/1K belongs to Burr-Brown's legacy 12-bit sampling ADC product line, designed specifically for multiplexed, ±10V industrial sensor interfacing with minimal external components and robust operation across extended temperature ranges.
FAQ
What is the maximum sampling rate supported by the ADS7824U/1K?
The ADS7824U/1K supports a maximum throughput rate of 40kHz, corresponding to a complete acquisition-and-conversion cycle of 25µs. This is achievable in both discrete and continuous conversion modes, provided the input signal settles within the 5µs acquisition time and the multiplexer settles within 5µs. The device maintains ±0.5 LSB linearity and 70dB SNR at this rate when operated within its specified temperature and supply voltage ranges.
Does the ADS7824U/1K require an external reference voltage?
No, the ADS7824U/1K includes an internal +2.5V reference with ±0.25% initial accuracy and ±5ppm/°C drift, sufficient for most industrial applications. The REF pin outputs this voltage and must be bypassed with a 2.2µF tantalum capacitor to AGND2. An external reference (2.3V–2.7V) may be used for higher precision, but doing so forfeits the guaranteed ±0.5 LSB INL specification unless the external reference meets tight noise and drift requirements.
How does the continuous conversion mode work on the ADS7824U/1K?
When CONTC is driven HIGH and CS/R/C/PWRD are LOW, the ADS7824U/1K automatically sequences through AIN0 → AIN1 → AIN2 → AIN3 repeatedly, performing conversions without host intervention. Channel address pins A0/A1 become outputs reflecting the active channel. BUSY remains LOW between conversions, and serial/parallel data reflects the most recent completed channel result - enabling deterministic, low-latency multi-channel sampling.
Can the ADS7824U/1K interface directly with a microcontroller's parallel bus?
Yes, the ADS7824U/1K supports direct parallel interfacing via D0–D7, CS, R/C, BYTE, and BUSY. With PAR/SER = HIGH, it outputs 12-bit data in two bytes: MSBs on D7–D0 when BYTE = LOW, LSBs on D4–D0 (with D7–D5 tri-stated) when BYTE = HIGH. BUSY's rising edge serves as a ready/latch signal. No glue logic is required, and timing complies with standard 8051/68k-style bus protocols at up to 40kHz sustained throughput.
What is the purpose of the TAG pin on the ADS7824U/1K?
The TAG pin (D0 in serial mode) accepts serial input bits synchronized to DATACLK - either internal or external. Each TAG bit appears on SDATA 13–15 clock edges later, enabling bidirectional tagging of conversion results (e.g., channel ID, timestamp flag, or CRC). This feature allows host systems to embed metadata alongside ADC data without additional control lines, reducing interface complexity in serial-configured systems.
ADS7824U/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- 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:
- -
ADS7824U/1K FAQ
1.How can I place an order for ADS7824U/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7824U/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 ADS7824U/1K reliable?
The price and inventory of ADS7824U/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7824U/1K is usually 5 days.
3.What payment methods are accepted for ADS7824U/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7824U/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7824U/1K?
ADS7824U/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7824U/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 ADS7824U/1K?
For technical support, including ADS7824U/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7824U/1K requirements.
6.How does Aetrix verify that ADS7824U/1K is sourced from the original manufacturer or authorized distributors?
All ADS7824U/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 ADS7824U/1K meets industry standards.
7.What is the process for return or replacement of ADS7824U/1K?
All ADS7824U/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7824U/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 ADS7824U/1K part is unused and in its original packaging.
Return procedure for ADS7824U/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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