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Texas Instruments ADS7825PB
- Part No.:
- ADS7825PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7825PB.pdf
- Description:
- IC ADC 16BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,187
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Product details
Overview
ADS7825PB from Burr-Brown (now Texas Instruments) is a 16-bit, 4-channel successive-approximation analog-to-digital converter with ±10V input range, 25µs max complete cycle time, and dual parallel/serial output interface. It integrates internal +2.5V reference, sample-and-hold, multiplexer, and continuous conversion mode - used in industrial data acquisition systems requiring high-resolution multichannel sampling under single +5V supply.
For engineers reviewing the ADS7825PB datasheet, ADS7825PB pinout, ADS7825PB application, or ADS7825PB equivalent, key selection considerations include its 28-pin plastic DIP package, ±2 LSB INL (typ), 86 dB SINAD at 1 kHz, and support for both microprocessor parallel bus and serial SPI-like timing without external clock dependency.
Technical Context
The ADS7825PB implements a capacitor-based successive approximation register (SAR) architecture with laser-trimmed scaling resistors to achieve ±0.1% channel-to-channel matching across its four ±10V analog inputs. Its internal 2.5V reference is buffered via CAP pin and requires a 2.2µF tantalum capacitor to AGND2 for stability.
It supports three operational modes: single-shot (via CS/R/C), continuous conversion (CONTC = HIGH), and power-down (PWRD = HIGH). Data output is configurable as 16-bit parallel (two 8-bit bytes via BYTE control) or serial MSB-first (SDATA/DATACLK), with BUSY used for handshaking and latching.
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 - compatible with industrial sensor outputs without external signal conditioning |
| Throughput Rate | 40 kHz - enables real-time sampling of signals up to ~90 kHz Nyquist bandwidth |
| INL Error | ±2 LSB (typ) - ensures monotonicity and <0.003% linearity error for precision measurement |
| Power Dissipation | 50 mW (active), 50 µW (power-down) - suitable for thermally constrained embedded systems |
| Operating Temp | –40°C to +85°C - fully specified for industrial environments |
| SINAD | 86 dB (typ) at 1 kHz - supports >14 effective bits for low-noise applications |
Pinout & Package
ADS7825PB is housed in a 28-pin 0.3" wide plastic DIP (dual in-line package), RoHS-compliant and rated for industrial temperature operation. Pin spacing is 0.1" (2.54 mm), with through-hole mounting and standard DIP footprint compatibility.
| 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 accepts ±10V, 45.7 kΩ input impedance, 35 pF capacitance |
| 6, 7 | CAP, REF | Internal reference buffer output and reference I/O - REF must be bypassed with 2.2 µF tantalum to AGND2 |
| 9–13, 15–17 | D7–D0 | Parallel data bus - tri-state capable; D4/D2/D1/D0 serve dual roles in serial mode (clock/data/control) |
| 18–19 | A1, A0 | Channel address outputs (in continuous mode) or inputs (in single-shot) - indicate active input channel |
| 20–26 | PAR/SER, BYTE, R/C, CS, BUSY, CONTC, PWRD | Mode and control interface - enable parallel/serial selection, byte read, conversion trigger, chip select, status, sequencing, and sleep |
Key Features
| Feature | Design Value |
|---|---|
| Integrated +2.5V Reference | 2.48–2.52 V (±0.25%) with ±5 ppm/°C drift - eliminates need for external precision reference in most applications |
| Continuous Conversion Mode | Automatically cycles through all four channels with no software overhead - ideal for cyclic data logging |
| Parallel + Serial Interface | Single device supports 8-bit microcontroller parallel bus or low-pin-count serial (SPI-compatible timing) - reduces system BOM and layout complexity |
| Low Power Down Current | 50 µW - enables battery-backed operation or periodic wake-up sampling in energy-constrained systems |
| Channel Crosstalk | ≥100 dB (adjacent), ≥120 dB (non-adjacent) - preserves signal integrity in mixed-signal monitoring of multiple sensors |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous acquisition of voltage outputs from four pressure, temperature, and flow transmitters in a PLC rack. IC Role / Device Role / Timing Role: 16-bit SAR ADC with integrated multiplexer and reference - performs synchronized 4-channel sampling every 25 µs. Use Value: Eliminates external MUX and reference ICs; ±0.1% channel matching ensures consistent calibration across sensor inputs. |
Use Scenario: Digitizing analog waveforms in portable oscilloscopes and signal analyzers with limited PCB area. IC Role / Device Role / Timing Role: High-speed sampling ADC with parallel/serial flexibility - interfaces directly to FPGA or ARM Cortex-M MCU. Use Value: 86 dB SINAD supports >14 ENOB; 25 µs throughput enables 40 kSPS real-time capture without oversampling. |
| Energy Metering Systems | Motor Control Feedback |
|
Use Scenario: Simultaneous sampling of phase voltages and currents in three-phase smart meters with anti-tampering diagnostics. IC Role / Device Role / Timing Role: Precision multichannel ADC with ±10V range - acquires isolated sensor outputs via resistive dividers. Use Value: ±2 LSB INL ensures metering accuracy within Class 0.2; continuous mode simplifies firmware for cyclic waveform capture. |
Use Scenario: Closed-loop position/speed feedback in servo drives using resolver or Hall-effect sensor analog outputs. IC Role / Device Role / Timing Role: Low-latency ADC with BUSY-driven latching - synchronizes sampling to PWM switching periods. Use Value: 20 µs conversion time allows sub-25 µs control loop updates; 50 mW dissipation avoids thermal derating in compact enclosures. |
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 |
|---|---|---|---|
| ADS7825U | Same core specs, but in SOIC-28 package (smaller footprint, higher thermal resistance) | Better suited for space-constrained PCBs; less robust for manual prototyping or high-vibration environments | Select ADS7825U when board area is critical and reflow assembly is available. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI-only interface, no internal reference, 16-pin TSSOP | Lacks multiplexer and internal reference - requires external components for 4-channel ±10V operation | Choose ADS8325IPW only if higher speed and smaller package outweigh added BOM and design effort. |
Compared with ADS7825U and ADS8325IPW, the ADS7825PB uniquely combines 4-channel multiplexing, internal ±10V-range reference, parallel/serial flexibility, and DIP packaging - making it optimal for industrial prototyping, legacy system upgrades, and applications where analog integration reduces component count and layout risk.
Availability
ADS7825PB is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment development, and motor control feedback systems requiring stable component supply and long-term obsolescence management.
Supply support for ADS7825PB 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 and instrumentation markets.
The ADS7825PB belongs to Burr-Brown's legacy 16-bit SAR ADC family designed specifically for multichannel, ±10V industrial data acquisition - emphasizing integration, ease of use, and robustness over raw speed.
FAQ
What is the maximum sampling rate supported by the ADS7825PB?
The ADS7825PB achieves a maximum throughput rate of 40 kHz, corresponding to a complete acquire-and-convert 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. In continuous conversion mode, it sequences through all four channels at this rate, delivering one 16-bit sample per channel every 100 µs.
Does the ADS7825PB require an external reference voltage?
No - the ADS7825PB includes a laser-trimmed internal +2.5 V reference with ±0.25% initial accuracy and ±5 ppm/°C drift. The REF pin outputs this voltage and must be bypassed to AGND2 with a 2.2 µF tantalum capacitor. An external reference can be applied to REF, but the internal reference is fully functional and eliminates external component requirements for most applications.
How does the ADS7825PB handle channel selection in continuous conversion mode?
In continuous conversion mode (CONTC = HIGH), the ADS7825PB automatically cycles through AIN0 → AIN1 → AIN2 → AIN3 repeatedly. Channel address pins A1/A0 become outputs reflecting the currently sampled channel (00–11 binary). No software polling or external addressing is needed - the device self-sequences, and BUSY pulses indicate completion of each channel's conversion.
Can the ADS7825PB interface directly with an 8-bit microcontroller?
Yes - the ADS7825PB supports 8-bit parallel data transfer via two consecutive 8-bit reads (MSB first, controlled by BYTE pin), making it compatible with 8-bit MCUs such as the 8051 or PIC18. Its TTL/CMOS-compatible digital I/O levels (VIH ≥ +2.4 V, VIL ≤ +0.8 V) and 50 mA absolute max current rating ensure safe interfacing without level-shifting circuitry.
What is the purpose of the TAG pin on the ADS7825PB?
The TAG pin (D0 in serial mode) serves as a serial data input synchronized to DATACLK. When enabled, it allows the host controller to send 1-bit-per-clock control or status information back to the ADS7825PB during serial data transmission - for example, to flag alarm conditions or configure auxiliary functions. Its value appears on SDATA after 17–19 clock edges, enabling bidirectional serial communication without additional pins.
ADS7825PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7825PB FAQ
1.How can I place an order for ADS7825PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7825PB 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 ADS7825PB reliable?
The price and inventory of ADS7825PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7825PB is usually 5 days.
3.What payment methods are accepted for ADS7825PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7825PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7825PB?
ADS7825PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7825PB 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 ADS7825PB?
For technical support, including ADS7825PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7825PB requirements.
6.How does Aetrix verify that ADS7825PB is sourced from the original manufacturer or authorized distributors?
All ADS7825PB 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 ADS7825PB meets industry standards.
7.What is the process for return or replacement of ADS7825PB?
All ADS7825PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7825PB, 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 ADS7825PB part is unused and in its original packaging.
Return procedure for ADS7825PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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