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Texas Instruments ADS7812PB
- Part No.:
- ADS7812PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7812PB.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
ADS7812PB from Texas Instruments is a low-power, single +5V supply, 12-bit sampling analog-to-digital converter (ADC) with SAR architecture, integrated sample/hold, internal +2.5V reference, and SPI-compatible serial interface. It supports multiple input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V, with input overvoltage tolerance up to ±16.5V. It delivers 40kHz throughput, ±0.5LSB INL/DNL, and 72dB SINAD - ideal for precision industrial data acquisition systems.
For engineers reviewing the ADS7812PB datasheet, ADS7812PB pinout, ADS7812PB application, or ADS7812PB equivalent, key selection considerations include its 12-bit resolution with no missing codes, 20µs max conversion time, flexible input range configuration via R1IN/R2IN/R3IN terminal wiring, and compatibility with both internal and external serial clocking modes (EXT/INT control).
Technical Context
The ADS7812PB implements a capacitor-based successive approximation register (SAR) architecture with an integrated sample/hold circuit and on-chip 2.5V reference (±0.2% initial accuracy, 8ppm/°C drift). Its analog front-end supports eight programmable input configurations via three analog inputs (R1IN, R2IN, R3IN) tied to VIN, GND, or BUF, enabling ±10V, ±5V, unipolar, and high-impedance (≥10MΩ) ranges.
Digital operation uses a tri-state SPI-compatible serial interface with selectable clock source (internal or external via EXT/INT pin), 12-bit binary two's complement output (MSB first), and BUSY-driven timing synchronization. Conversion is initiated by a falling edge on CONV, independent of CS state, with full cycle time of 25µs and power-down mode consuming only 50µW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88mV LSB step size in ±10V range for sub-5mV measurement granularity. |
| Throughput Rate | 40kHz - enables real-time sampling of signals up to 20kHz (Nyquist-limited) without aliasing. |
| INL / DNL | ±0.5LSB max - ensures monotonicity and <0.12% full-scale linearity error for calibrated sensor interfacing. |
| SINAD | 72dB min - corresponds to ~11.7 effective bits (ENOB) at 1kHz input, suitable for medium-fidelity signal capture. |
| Supply Voltage | +4.75V to +5.25V - operates from standard 5V rail with ±5% tolerance; decoupling requires 0.1µF ceramic + 10µF tantalum. |
| Power Dissipation | 35mW max at 40kHz - enables thermally constrained designs; drops to 50µW in power-down mode. |
| Input Overvoltage | ±16.5V - protects against transient surges beyond rated input ranges without latch-up or damage. |
| Reference | Internal +2.5V (±0.2%), 8ppm/°C drift - eliminates external reference component count while maintaining stability across –40°C to +85°C. |
Pinout & Package
ADS7812PB is housed in a 0.3" wide 16-pin plastic DIP package (dual in-line package), compatible with through-hole prototyping and legacy industrial PCB layouts. Pin spacing is 0.1" (2.54mm), body width 0.3", and total length 0.75".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input Channel 1 | Primary differential or single-ended input; wired with R2IN/R3IN to configure ±10V, ±5V, or 0.5V–4.5V ranges per Table I. |
| GND (Pins 2 & 8) | Analog/Digital Ground Reference | Separate ground pins minimize noise coupling; must be connected to common system ground plane. |
| R2IN, R3IN | Analog Input Channels 2 & 3 | Configurable bias/reference connection points - not independent inputs; used with R1IN to set gain/offset via resistor network. |
| BUF | Reference Buffer Output | Provides buffered +2.5V for input range scaling; drives R1IN/R2IN/R3IN to enable high-Z (≥10MΩ) or bipolar modes. |
| CAP | Reference Compensation Node | Requires 1µF tantalum || 0.01µF ceramic to ground to stabilize internal reference buffer and prevent oscillation. |
| REF | Reference Input/Output | Outputs internal 2.5V reference (4kΩ series impedance); accepts external 2.3–2.7V reference to override internal source. |
| DATACLK | Serial Clock I/O | Input when EXT/INT = HIGH; output (tri-stated when CS = HIGH) when EXT/INT = LOW - synchronizes 12-bit BTC data transfer. |
| DATA | Serial Data Output | 12-bit binary two's complement MSB-first stream; valid on rising/falling edges of DATACLK (internal clock mode). |
| CONV | Convert Trigger Input | Falling-edge sensitive; initiates sample/hold and conversion regardless of CS state; minimum pulse width 40ns. |
| CS | Chip Select Input | Active-low enables DATA, BUSY, and DATACLK outputs; does not gate CONV - conversion starts even if CS = HIGH. |
| BUSY | Conversion Status Output | Active-low open-drain signal; LOW during entire conversion + serial transmission; usable as frame sync in internal clock mode. |
| EXT/INT | Serial Clock Source Select | LOW = internal DATACLK generation; HIGH = external clock required - determines timing relationship between BUSY and DATA. |
| PWRD | Power-Down Control | Active-high enters 50µW standby; requires CONV = LOW before assertion to minimize wake-up latency (300µs recovery with 1µF CAP). |
| VS | +5V Supply Input | Single-supply operation only; must be decoupled locally to suppress switching noise affecting ADC accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Multiple Configurable Input Ranges | Eight discrete analog input configurations (e.g., ±10V, 0.5V–4.5V, high-Z >10MΩ) achieved via hardware wiring of R1IN/R2IN/R3IN to VIN/GND/BUF - no software register writes needed. |
| No Missing Codes | Guaranteed monotonic transfer function across full temperature range (–40°C to +85°C) - essential for closed-loop control and position feedback where code gaps cause instability. |
| Flexible Serial Interface | Supports both internal clock (self-timed, BUSY-synchronized) and external clock (user-controlled timing) modes via EXT/INT pin - simplifies integration with microcontrollers lacking dedicated SPI peripherals. |
| Overvoltage-Tolerant Inputs | Analog inputs survive ±16.5V transients without damage - reduces need for external protection circuitry in noisy industrial environments (e.g., motor drive feedback). |
| Low-Power Power-Down Mode | 50µW standby current enables battery-operated or energy-harvesting DAQ nodes; wake-up latency under 300µs with proper CAP decoupling. |
| Pin Compatibility with ADS7813 | Identical pinout and footprint to 16-bit ADS7813 - allows resolution scalability in same PCB layout; digital interface differs only in bit count and timing margins. |
Applications
| Data Acquisition Systems | Industrial Process Monitoring |
|---|---|
Use Scenario: High-accuracy voltage measurement in modular PLC analog input modules acquiring sensor signals (thermocouples, strain gauges, RTDs) across ±10V or 0–10V ranges. IC Role / Device Role / Timing Role: Primary 12-bit SAR ADC performing synchronized sampling with internal reference and serial readout to host MCU via SPI. Use Value: ±0.5LSB linearity and 72dB SINAD ensure <0.1% measurement uncertainty without calibration; ±16.5V overvoltage tolerance eliminates external clamping diodes. | Use Scenario: Analog monitoring of motor phase currents and DC bus voltages in variable frequency drives, requiring isolation and noise immunity. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing conditioned analog signals; uses high-impedance 0.3–2.8V input range to interface with isolated amplifiers. Use Value: ≥10MΩ input impedance minimizes loading on isolated amplifier outputs; 40kHz throughput captures current ripple harmonics up to 20kHz. |
| Test & Measurement Equipment | DSP-Based Signal Conditioning |
Use Scenario: Portable handheld multimeter or oscilloscope front-end capturing DC/AC voltage with autoranging and auto-zero functionality. IC Role / Device Role / Timing Role: Core ADC in dual-slope or SAR-based meter architecture; leverages multiple input ranges and internal reference for self-calibration routines. Use Value: Internal 2.5V reference (8ppm/°C drift) enables stable zero-offset correction across operating temperature; no missing codes prevents display glitches during range switching. | Use Scenario: Real-time audio or vibration analysis node digitizing accelerometer or microphone outputs prior to FFT processing in embedded DSP. IC Role / Device Role / Timing Role: Low-latency ADC feeding fixed-point DSP; configured for 0.5V–4.5V unipolar range to match sensor output swing. Use Value: 20µs conversion time and BUSY-synchronized serial output allow deterministic data flow into DSP DMA buffers; 35mW power enables fanless enclosure design. |
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 |
|---|---|---|---|
| ADS7812U | Same electrical specs and pinout; SO-16 surface-mount package instead of DIP-16. | Required for automated SMT assembly; lacks through-hole mounting for prototyping or repair. | Select ADS7812U for volume production PCBs using reflow soldering; ADS7812PB remains optimal for lab validation and field-replaceable modules. |
| ADS7822U | 12-bit, 200kHz SAR ADC in SO-16; uses external reference only; no internal reference or BUF/CAP pins. | Higher speed but less flexible input configuration; requires external 2.5V reference and additional passive components. | Choose ADS7822U when throughput >40kHz is mandatory and board space permits external reference circuitry; ADS7812PB preferred when simplicity and input range versatility are prioritized. |
Compared with ADS7812U (SO-16) and ADS7822U (200kHz, external ref), the ADS7812PB offers unique value in through-hole DIP packaging, integrated reference with BUF/CAP support, and eight hardware-configurable input ranges - making it optimal for industrial DAQ modules requiring serviceability, minimal BOM count, and multi-range flexibility without firmware overhead.
Availability
ADS7812PB is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment development, and embedded data acquisition systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for ADS7812PB 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.
The ADS7812PB belongs to TI's precision SAR ADC product line, designed specifically for cost-sensitive, low-power industrial data acquisition where flexibility in input range, robustness against overvoltage, and ease of integration outweigh raw speed requirements.
FAQ
What input voltage ranges does the ADS7812PB support, and how are they configured?
The ADS7812PB supports eight analog input configurations including ±10V, ±5V, 0V to 10V, 0.5V to 4.5V, and a high-impedance 0.3V to 2.8V range. These are selected by wiring R1IN, R2IN, and R3IN to VIN, GND, or BUF per Table I in the datasheet - no software registers or external components are required. The ADS7812PB's internal resistor network (with ±30% tolerance) and BUF output enable precise gain/offset setting directly at the analog front-end.
Does the ADS7812PB require an external reference, or does it have an internal one?
The ADS7812PB includes an internal +2.5V reference (2.48V to 2.52V, 8ppm/°C drift) that can be used directly, eliminating the need for external reference components. The REF pin outputs this voltage through a 4kΩ series resistor and accepts external 2.3V–2.7V references to override the internal source. The BUF and CAP pins support reference buffering and compensation - critical for maintaining accuracy in the ADS7812PB's specified ±0.5LSB INL performance.
How does the serial interface of the ADS7812PB operate, and what clocking options are available?
The ADS7812PB features an SPI-compatible serial interface with selectable clock source controlled by the EXT/INT pin. When EXT/INT = LOW, DATACLK is an output providing internal synchronous timing; when EXT/INT = HIGH, DATACLK becomes an input requiring external clocking. Data is 12-bit binary two's complement, MSB-first, and valid on both edges of DATACLK in internal mode. BUSY serves as frame sync, going LOW for the full conversion + transmission period - a key timing feature of the ADS7812PB interface.
What is the power consumption profile of the ADS7812PB, and how does power-down mode work?
The ADS7812PB consumes 35mW maximum at 40kHz throughput with +5V supply, dropping to just 50µW in power-down mode activated by driving PWRD HIGH. To achieve minimum wake-up latency (300µs), CONV must be held LOW before asserting PWRD. Recovery requires stable CAP decoupling (1µF tantalum || 0.01µF ceramic) and accounts for internal reference settling. This ultra-low standby power makes the ADS7812PB suitable for battery-backed or energy-constrained industrial sensors.
Is the ADS7812PB pin-compatible with other devices in the same family, and what are the implications?
Yes, the ADS7812PB is pin-compatible with the 16-bit ADS7813 in the same DIP-16 package, sharing identical pin functions and physical layout. This allows hardware reuse across resolution tiers - a system designed for ADS7812PB can be upgraded to ADS7813 without PCB changes. However, the ADS7813 requires 16 clock cycles vs. 12 for the ADS7812PB, and its conversion time is ~133% longer. Firmware must accommodate bit-width differences, but layout and analog front-end remain unchanged for the ADS7812PB and ADS7813.
ADS7812PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- 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:
- 16-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7812PB FAQ
1.How can I place an order for ADS7812PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7812PB 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 ADS7812PB reliable?
The price and inventory of ADS7812PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7812PB is usually 5 days.
3.What payment methods are accepted for ADS7812PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7812PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7812PB?
ADS7812PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7812PB 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 ADS7812PB?
For technical support, including ADS7812PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7812PB requirements.
6.How does Aetrix verify that ADS7812PB is sourced from the original manufacturer or authorized distributors?
All ADS7812PB 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 ADS7812PB meets industry standards.
7.What is the process for return or replacement of ADS7812PB?
All ADS7812PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7812PB, 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 ADS7812PB part is unused and in its original packaging.
Return procedure for ADS7812PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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