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Texas Instruments ADS7812P-TI
- Part No.:
- ADS7812P-TI
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
ADS7812P-TI.pdf
- Description:
- ADC, SUCCESSIVE APPROXIMATION, 1
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Product details
Overview
ADS7812P-TI from Texas Instruments is a low-power, single-supply +5V, 12-bit SAR analog-to-digital converter with integrated sample/hold, internal 2.5V reference, and SPI-compatible serial interface. It supports configurable input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V, with >10MΩ high-impedance mode, and delivers 40kHz sampling rate over –40°C to +85°C for industrial data acquisition systems.
For engineers reviewing the ADS7812P-TI datasheet, ADS7812P-TI pinout, ADS7812P-TI application, or ADS7812P-TI equivalent, key selection considerations include its 20µs max conversion time, ±0.5LSB INL/DNL, 72dB min SINAD, flexible external/internal clocking via EXT/INT pin, and dual-package availability in 0.3" DIP-16 and SO-16.
Technical Context
The ADS7812P-TI implements a capacitor-based successive approximation register (SAR) architecture with on-chip sample/hold, internal 2.5V reference (±0.1% initial accuracy, 8ppm/°C drift), and programmable input range selection via external resistor network configuration at R1IN/R2IN/R3IN. Its serial interface operates in either internal-clock mode (DATACLK output, MSB-first two's complement, valid on both clock edges) or external-clock mode (DATACLK input, falling-edge data capture).
Conversion timing is fully synchronous: a falling edge on CONV initiates acquisition and conversion; BUSY goes LOW for 15–20µs; and result latching into the shift register occurs just before BUSY rises. Power-down mode reduces dissipation to 50µW, with 300µs recovery to full accuracy after wake-up using a 1µF CAP decoupling capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 4.88mV for ±10V range, enabling precise voltage monitoring in sensor interfaces. |
| Sampling Rate | 40kHz maximum - supports real-time waveform capture up to ~130kHz useable bandwidth per SINAD spec. |
| INL / DNL | ±0.5LSB max - ensures monotonicity and <0.12% full-scale linearity error, critical for closed-loop control feedback. |
| SINAD | 72dB min at 1kHz - corresponds to ~11.9 effective bits, suitable for medium-fidelity instrumentation digitization. |
| Power Dissipation | 35mW typical at 40kHz - enables thermally constrained designs; drops to 50µW in power-down mode. |
| Input Voltage Range | Configurable: ±10V, ±5V, 0–10V, 0.5–4.5V, or high-Z 0.3–2.8V - supports direct connection to diverse transducer outputs without external signal conditioning. |
| Reference | Internal 2.5V ±0.1% (8ppm/°C drift) or external 2.3–2.7V - allows system-level reference sharing or enhanced stability via precision external source. |
Pinout & Package
ADS7812P-TI is packaged in a 0.3" wide 16-pin plastic DIP (Dual In-line Package), pin-compatible with ADS7813P and suitable for through-hole prototyping and industrial PCB layouts requiring mechanical robustness and thermal margin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input Channel 1 | Primary differential or single-ended input; configured with R2IN/R3IN/BUF to set gain/offset for ±10V, ±5V, or unipolar ranges. |
| GND (pins 2 & 8) | Analog/Digital Ground Reference | Separate ground pins support star-ground layout; pin 2 serves analog section, pin 8 serves digital I/O domain. |
| R2IN, R3IN | Secondary Analog Inputs | Used with R1IN and BUF to configure input impedance and common-mode rejection across 16+ supported ranges (Table IV). |
| BUF | Reference Buffer Output | Provides low-impedance 2.5V source for biasing input resistors; enables high-Z mode (>10MΩ) when connected to all inputs. |
| CAP | Reference Buffer Compensation Node | Requires 1µF tantalum || 0.01µF ceramic to ground; stabilizes internal buffer and prevents oscillation during power-down recovery. |
| REF | Reference Input/Output | Outputs internal 2.5V via 4kΩ series resistor; accepts external 2.3–2.7V reference to override internal source and improve system accuracy. |
| DATACLK | Serial Clock I/O | Configurable as output (EXT/INT = LOW) for internal sync or input (EXT/INT = HIGH) for microcontroller-controlled readout. |
| DATA | Serial Data Output | 12-bit two's complement MSB-first stream; tri-stated when CS = HIGH; valid on both DATACLK edges in internal-clock mode. |
| CONV | Convert Trigger Input | Falling-edge initiated; starts conversion independent of CS state; must be static during t2–t25 window to avoid noise coupling into analog core. |
| CS | Chip Select | Enables/disables DATA, BUSY, and DATACLK (when EXT/INT = LOW); does not inhibit CONV-triggered conversion initiation. |
| BUSY | Conversion Status Indicator | Active-low open-drain output; LOW for entire 15–20µs conversion cycle; usable as frame sync or interrupt source. |
| PWRD | Power-Down Control | High-active; reduces supply current to <10µA; requires CONV = LOW before assertion to minimize wake-up latency. |
| VS | +5V Supply Input | Single 4.75–5.25V rail; requires local 0.1µF ceramic || 10µF tantalum decoupling to maintain PSRR and prevent linearity degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Input Range Configuration | 16+ selectable analog input ranges (e.g., ±10V, 0.5–4.5V, high-Z 0.3–2.8V) via external resistor connections-eliminates need for external op-amp level-shifting in multi-sensor DAQ systems. |
| Low-Power Serial Interface | 35mW active / 50µW power-down operation with SPI-compatible timing-enables battery-powered portable test equipment and energy-conscious industrial nodes. |
| No Missing Codes Guarantee | Monotonic 12-bit transfer function across full temperature range-ensures reliable position sensing and motor control feedback without code ambiguities. |
| Robust Absolute Maximum Ratings | Analog inputs tolerate ±16.5V continuous, transient overvoltage recovery in <750ns-protects against field-induced surges in PLC analog input modules. |
| Pin Compatibility with ADS7813 | Identical DIP-16/SO-16 footprint and pinout to 16-bit ADS7813-allows hardware reuse and scalable resolution upgrades without PCB redesign. |
Applications
| Data Acquisition Systems | Industrial Process Control |
|---|---|
|
Use Scenario: High-channel-count modular DAQ units acquiring voltage signals from thermocouples, strain gauges, and RTDs in factory-floor environments. IC Role / Device Role / Timing Role: Primary ADC front-end converting conditioned analog sensor outputs to 12-bit digital words synchronized to host controller via SPI. Use Value: Configurable ±10V/±5V input ranges and >10MΩ high-Z mode enable direct connection to passive sensors without external amplifiers, reducing BOM count and board area. |
Use Scenario: Analog input modules in programmable logic controllers (PLCs) monitoring pressure, flow, and temperature in chemical processing plants. IC Role / Device Role / Timing Role: Isolated analog-to-digital conversion stage providing 40kHz sampling for fast-cycling control loops with deterministic BUSY-driven timing. Use Value: ±16.5V absolute max input rating and 300µs power-down recovery ensure resilience against field wiring faults and support hot-swap maintenance without system shutdown. |
| Automated Test Equipment (ATE) | DSP-Based Signal Analysis |
|
Use Scenario: Benchtop multimeters and functional testers capturing transient waveforms during component validation and failure analysis. IC Role / Device Role / Timing Role: Precision digitizer with 72dB SINAD and 20µs conversion time, interfaced to FPGA or microcontroller for real-time histogramming and pass/fail evaluation. Use Value: Internal 2.5V reference (8ppm/°C drift) and ±0.5LSB INL enable calibrated measurements traceable to system reference, reducing calibration overhead. |
Use Scenario: Embedded audio or vibration analyzers performing FFT-based spectral analysis on machine health signals in predictive maintenance gateways. IC Role / Device Role / Timing Role: Medium-speed ADC feeding 12-bit samples to DSP engine; uses external DATACLK mode for deterministic readout aligned with DMA buffers. Use Value: 130kHz useable bandwidth and 70dB SNR support accurate 10-bit-equivalent frequency-domain analysis up to ~60kHz, matching anti-alias filter 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 |
|---|---|---|---|
| ADS7813P-TI | 16-bit resolution, same DIP-16 package and pinout, 33% longer conversion time (≈26.6µs), higher 50mW power dissipation. | Required where >12-bit dynamic range is needed for low-noise sensor interfaces or high-precision metrology. | Select ADS7813P-TI only if 16-bit resolution is mandatory; ADS7812P-TI offers better power efficiency and cost for 12-bit use cases. |
| MAX1112CPE+ | 12-bit, +5V supply, SPI interface, but uses external reference only; no internal reference; 25µs conversion time; 28-pin PDIP package. | Preferred in legacy designs already using precision external references and requiring pin compatibility with MAXIM's 28-pin family. | Choose MAX1112CPE+ only when leveraging existing 28-pin socket infrastructure or requiring guaranteed external-reference-only operation. |
Compared with ADS7812P-TI, ADS7813P-TI provides higher resolution at the cost of speed and power, while MAX1112CPE+ lacks an internal reference and requires larger board space-making ADS7812P-TI optimal for new 12-bit DIP-based designs needing integrated reference and low-power operation.
Availability
ADS7812P-TI is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and embedded data acquisition systems requiring stable component supply, long-term lifecycle support, and through-hole manufacturability.
Supply support for ADS7812P-TI 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 IC design.
The ADS7812P-TI belongs to TI's precision SAR ADC product line, engineered specifically for cost-sensitive, low-power industrial data acquisition where configurability, robustness, and ease of integration outweigh ultra-high resolution requirements.
FAQ
What input voltage ranges does the ADS7812P-TI support, and how are they configured?
The ADS7812P-TI supports 16+ input ranges-including ±10V, ±5V, 0V to 10V, 0.5V to 4.5V, and a high-impedance 0.3V to 2.8V mode-by connecting external resistors between R1IN, R2IN, R3IN, GND, and BUF pins per Table I and Table IV in the datasheet. Configuration is purely analog; no digital registers or commands are required. The ADS7812P-TI maintains specified INL/DNL and gain accuracy only for ranges marked "Specified offset and gain" in the tables.
Does the ADS7812P-TI require an external reference, or can it operate with its internal reference?
The ADS7812P-TI can operate with its internal 2.5V reference (2.48V to 2.52V, 8ppm/°C drift) or accept an external 2.3V to 2.7V reference applied to the REF pin, which overrides the internal source. Using the internal reference simplifies design and reduces component count; external reference improves absolute accuracy and temperature stability when system-level calibration is critical. The ADS7812P-TI functions correctly in either mode without configuration changes.
How does the serial interface of the ADS7812P-TI work, and what clocking options are available?
The ADS7812P-TI features an SPI-compatible serial interface with two clocking modes selected by the EXT/INT pin: when LOW, DATACLK is an output providing internal clocking (data valid on both edges); when HIGH, DATACLK is an input requiring external clocking (data valid on falling edge). Data is 12-bit two's complement, MSB-first. Chip select (CS) enables/disables outputs but does not block CONV-triggered conversions. This flexibility allows seamless integration with microcontrollers lacking dedicated SPI peripherals.
What is the power consumption profile of the ADS7812P-TI, and how does power-down mode function?
The ADS7812P-TI consumes 35mW typical at 40kHz sampling and drops to 50µW in power-down mode (PWRD = HIGH). To achieve minimum wake-up latency, CONV must be held LOW before asserting PWRD. Recovery to full accuracy requires 300µs after power-down exit when using the recommended 1µF CAP decoupling capacitor. This makes the ADS7812P-TI suitable for battery-operated devices and systems requiring intermittent measurement bursts.
Is the ADS7812P-TI pin-compatible with other TI ADCs, and what are the implications for design reuse?
Yes-the ADS7812P-TI is pin-compatible with the 16-bit ADS7813P-TI in both DIP-16 and SO-16 packages, sharing identical pin functions, timing, and layout requirements. This allows hardware reuse across resolution tiers: a single PCB can support either device, enabling cost-optimized production variants or future upgrades. However, software must accommodate the different data word lengths (12-bit vs. 16-bit) and adjusted timing margins in the ADS7813P-TI.
ADS7812P-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
ADS7812P-TI FAQ
1.How can I place an order for ADS7812P-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7812P-TI 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 ADS7812P-TI reliable?
The price and inventory of ADS7812P-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7812P-TI is usually 5 days.
3.What payment methods are accepted for ADS7812P-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7812P-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7812P-TI?
ADS7812P-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7812P-TI 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 ADS7812P-TI?
For technical support, including ADS7812P-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7812P-TI requirements.
6.How does Aetrix verify that ADS7812P-TI is sourced from the original manufacturer or authorized distributors?
All ADS7812P-TI 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 ADS7812P-TI meets industry standards.
7.What is the process for return or replacement of ADS7812P-TI?
All ADS7812P-TI units undergo pre-shipment inspection (PSI). If there is an issue with ADS7812P-TI, 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 ADS7812P-TI part is unused and in its original packaging.
Return procedure for ADS7812P-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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