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Texas Instruments ADS7825UB
- Part No.:
- ADS7825UB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7825UB.pdf
- Description:
- IC ADC 16BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
ADS7825UB from Burr-Brown (now Texas Instruments) is a 16-bit, 4-channel sampling analog-to-digital converter with ±10V input range, successive approximation architecture, and dual parallel/serial interface. It achieves 25 µs max complete conversion cycle, ±2.0 LSB max INL, and operates on single +5V supply - used in industrial data acquisition systems requiring high-resolution multiplexed sensing.
For engineers reviewing the ADS7825UB datasheet, ADS7825UB pinout, ADS7825UB application, or ADS7825UB equivalent, key selection considerations include its SOIC-28 package, continuous conversion mode, internal 2.5V reference, ±10V bipolar input capability, and support for both microprocessor parallel bus and serial SPI-like timing via SDATA/DATACLK.
Technical Context
The ADS7825UB integrates a 4-channel analog multiplexer, track-and-hold amplifier, 16-bit SAR ADC core, internal trimmed ±10V scaling resistors, and a 2.5V reference buffer. Its control logic supports three operational modes: single-shot (via CS/R/C), continuous cycling across AIN0–AIN3 (with CONTC = HIGH), and power-down (PWRD = HIGH).
Digital interface flexibility is implemented through PAR/SER-selectable output: parallel mode delivers 16-bit two's complement data in two 8-bit bytes (MSB/LSB selectable via BYTE), while serial mode outputs MSB-first on SDATA synchronized to either internal clock (DATACLK output, EXT/INT = LOW) or external clock (DATACLK input, EXT/INT = HIGH), with SYNC pulse and TAG input for handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10V full-scale range |
| Input Range | ±10V bipolar - supports direct connection to industrial transducers without external signal conditioning |
| Throughput Rate | 40 kHz - enables real-time sampling of signals up to ~90 kHz Nyquist-limited bandwidth |
| INL Error | ±2.0 LSB max - ensures monotonicity and <0.003% linearity error for precision measurement |
| Power Dissipation | 50 mW active / 50 µW power-down - suitable for thermally constrained industrial enclosures |
| Operating Temp | –40°C to +85°C - fully specified for harsh industrial environments |
| Reference | Internal 2.5V ±0.25% - eliminates need for external reference unless higher accuracy required |
Pinout & Package
ADS7825UB is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package, 0.300" wide, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Pin 1 is located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 14 | AGND1, AGND2, DGND | Separate analog/digital ground pins - require star grounding to minimize noise coupling between domains |
| 2–5 | AIN0–AIN3 | Four differential-capable analog inputs - each supports ±10V full-scale with 45.7 kΩ input impedance |
| 6, 7 | CAP, REF | Internal reference buffer output and reference I/O - requires 2.2 µF tantalum bypass to AGND2 for stability |
| 9–13, 15–17 | D7–D0 | Parallel data bus - bidirectional in serial mode (D4/D2/D0 act as control inputs); tri-state when PAR/SER = LOW |
| 18–19 | A1, A0 | Channel address outputs (CONTC = HIGH) or inputs (CONTC = LOW) - indicate or select active input channel |
| 20–26 | PAR/SER, BYTE, R/C, CS, BUSY, CONTC, PWRD | Mode and timing control - enable parallel/serial selection, byte addressing, conversion start, chip select, busy signaling, continuous mode, and power-down |
| 27–28 | VS2, VS1 | +5V supply pins - must be tied together and decoupled with 0.1 µF ceramic + 10 µF tantalum to DGND |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel ±10V multiplexer | Enables compact multi-sensor monitoring without external MUX or level-shifting circuitry |
| Parallel + serial interface | Reduces BOM count by supporting legacy 8-bit microcontrollers (parallel) and space-constrained designs (serial) |
| Continuous conversion mode | Automatically cycles through all four channels - simplifies firmware for periodic system-level diagnostics |
| Internal 2.5V reference | Eliminates external reference IC and associated layout sensitivity - improves long-term drift performance |
| 50 µW power-down state | Allows integration into battery-backed or energy-harvesting systems where idle current must be sub-100 µA |
Applications
| Industrial PLC Analog Input Module | Test & Measurement Data Logger |
|---|---|
Use Scenario: Digitizing 4-channel 4–20 mA current loops and ±10V sensor outputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary ADC front-end with integrated MUX and reference - handles channel sequencing, sampling, and digital output formatting. Use Value: Reduces component count by eliminating external reference, op-amp buffers, and discrete MUX - improves MTBF and calibration stability. | Use Scenario: Capturing transient voltage waveforms from vibration sensors, strain gauges, and thermocouples in portable field instruments. IC Role / Device Role / Timing Role: High-fidelity sampling engine with low aperture delay (40 ns) and fast settling - ensures accurate time-domain capture. Use Value: Achieves 86 dB SINAD at 1 kHz - supports 14+ ENOB for post-processing FFT analysis and spectral diagnostics. |
| Motor Drive Current Feedback System | Medical Patient Monitoring Interface |
Use Scenario: Sampling phase currents and DC bus voltage in servo drives with isolation barriers and isolated power supplies. IC Role / Device Role / Timing Role: Isolated-side ADC with precise timing control - synchronizes conversions to PWM carrier edges via R/C trigger. Use Value: 25 µs max throughput enables >30 kHz current loop update rates - critical for field-oriented control stability. | Use Scenario: Acquiring ECG, respiration, and temperature signals in Class II medical devices requiring low-power, low-noise analog front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC with internal reference - minimizes calibration drift over patient monitoring sessions. Use Value: ±0.1% channel-to-channel mismatch ensures consistent gain matching across multi-lead ECG channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit, 1-MSPS SAR, SPI-only interface, no internal reference, 16-pin TSSOP | Lacks multiplexer and internal reference - requires external REF and MUX for 4-channel use | Choose for higher speed and smaller footprint where external components are acceptable |
| AD7656ASTZ | 16-bit, 6-channel, simultaneous sampling, parallel/serial, ±10V range, 64-pin LQFP | Simultaneous sampling across all channels - superior for phase-critical measurements like motor control | Choose when inter-channel phase alignment is mandatory and PCB area permits larger package |
Compared with ADS8325IPW and AD7656ASTZ, the ADS7825UB uniquely combines integrated 4-channel MUX, internal ±10V scaling, and dual parallel/serial interface in a compact SOIC-28 - making it optimal for cost-sensitive, space-constrained industrial DAQ where sequential sampling suffices.
Availability
ADS7825UB is available at Aetrix Electronics and suitable for industrial PLC analog input modules, test & measurement data loggers, motor drive current feedback systems, and medical patient monitoring interfaces requiring stable component supply across extended product lifecycles.
Supply support for ADS7825UB 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 precision analog ICs including data converters, amplifiers, and references for industrial and instrumentation markets.
The ADS7825UB belongs to Burr-Brown's high-accuracy sampling ADC product line, designed specifically for industrial data acquisition systems needing robust 16-bit resolution, multichannel flexibility, and simplified system integration.
FAQ
What is the maximum sampling rate supported by the ADS7825UB?
The ADS7825UB achieves a maximum throughput rate of 40 kHz, corresponding to a complete acquisition-and-conversion cycle of 25 µs. This is measured under specified conditions: TA = –40°C to +85°C, fS = 40 kHz, VS = +5 V ±5%, and using the internal reference. At higher temperatures or with external reference, throughput may decrease slightly due to increased settling time.
Does the ADS7825UB require an external reference voltage?
No - the ADS7825UB includes an internal 2.5 V reference with ±0.25% initial accuracy and ±5 ppm/°C drift, sufficient for most industrial applications. However, if tighter reference stability or absolute accuracy is required, an external reference can be applied to the REF pin, provided it falls within 2.3 V to 2.7 V and is properly buffered.
How does the continuous conversion mode work on the ADS7825UB?
When CONTC = HIGH and CS/R/C/PWRD are all LOW, the ADS7825UB automatically sequences through AIN0 → AIN1 → AIN2 → AIN3 repeatedly. Channel address outputs A1/A0 reflect the currently sampled channel. The BUSY signal remains LOW during active conversion and pulses HIGH only between channel updates - enabling synchronous readout per channel.
Can the ADS7825UB interface directly with an 8-bit microcontroller?
Yes - the ADS7825UB supports parallel 8-bit data transfer via D0–D7 with BYTE-selectable MSB/LSB access and R/C/CS handshaking. Its TTL-compatible logic levels (VIH ≥ +2.4 V, VIL ≤ +0.8 V) and 50 mA sink/source capability ensure reliable interfacing with legacy 8-bit MCUs without level shifters or bus buffers.
What is the purpose of the TAG pin on the ADS7825UB?
The TAG pin (D0 in serial mode) serves as a serial data input synchronized to DATACLK edges. When enabled, each rising edge of DATACLK captures one bit from TAG and shifts it into an internal register. These bits appear on SDATA during subsequent clock cycles - enabling bidirectional communication such as command injection or status reporting alongside ADC data.
ADS7825UB 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:
- 16
- 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:
- -
ADS7825UB FAQ
1.How can I place an order for ADS7825UB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7825UB 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 ADS7825UB reliable?
The price and inventory of ADS7825UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7825UB is usually 5 days.
3.What payment methods are accepted for ADS7825UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7825UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7825UB?
ADS7825UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7825UB 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 ADS7825UB?
For technical support, including ADS7825UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7825UB requirements.
6.How does Aetrix verify that ADS7825UB is sourced from the original manufacturer or authorized distributors?
All ADS7825UB 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 ADS7825UB meets industry standards.
7.What is the process for return or replacement of ADS7825UB?
All ADS7825UB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7825UB, 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 ADS7825UB part is unused and in its original packaging.
Return procedure for ADS7825UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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