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Texas Instruments ADS7812B/1K
- Part No.:
- ADS7812B/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
ADS7812B/1K.pdf
- Description:
- ADC, SUCCESSIVE APPROXIMATION, 1
- Quantity:
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Inventory:1,000
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Product details
Overview
ADS7812B/1K from Texas Instruments is a low-power, single +5V supply, 12-bit sampling analog-to-digital converter (ADC) featuring a capacitor-based SAR architecture with 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, delivers 40kHz throughput, and operates across –40°C to +85°C - ideal for industrial data acquisition systems requiring precision, flexibility, and low power.
For engineers reviewing the ADS7812B/1K datasheet, ADS7812B/1K pinout, ADS7812B/1K application, or ADS7812B/1K equivalent, key selection considerations include its 20µs max conversion time, ±0.5LSB max INL/DNL, 72dB min SINAD, flexible external/internal clocking via EXT/INT control, and compatibility with microcontroller serial interfaces in embedded measurement and control designs.
Technical Context
The ADS7812B/1K implements a successive approximation register (SAR) ADC with a fully integrated 12-bit capacitor DAC, on-chip sample/hold, and programmable input range configuration via external resistor connections to R1IN/R2IN/R3IN. Its internal +2.5V reference (±0.2% initial accuracy, 8ppm/°C drift) can be overridden by an external 2.3V–2.7V reference.
It features dual clocking modes: internal DATACLK (tri-stated when CS=HIGH) or external DATACLK (synchronized to user-provided edge), with BUSY signaling active-low conversion status and CONV-triggered acquisition. Power-down mode reduces consumption to 50µW while retaining fast wake-up (<300µs recovery to rated accuracy).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = 4.88mV full-scale step for ±10V range, enabling precise voltage digitization in industrial sensors. |
| Throughput Rate | 40kHz - supports real-time sampling of signals up to ~130kHz usable bandwidth (SINAD ≥60dB), suitable for dynamic process monitoring. |
| INL / DNL | ±0.5LSB max - ensures monotonicity and <0.12% full-scale linearity error, critical for closed-loop control feedback accuracy. |
| SINAD | 72dB min at 1kHz - corresponds to ~11.9 effective bits, supporting high-fidelity signal capture in test equipment and DSP front-ends. |
| Power Dissipation | 35mW max at 40kHz - enables thermally constrained designs; drops to 50µW in power-down mode for intermittent sampling. |
| Input Voltage Range | Configurable ±10V, ±5V, 0V–10V, or 0.5V–4.5V - accommodates diverse sensor outputs without external signal conditioning. |
| Reference | Internal +2.5V (2.48–2.52V), 8ppm/°C drift - eliminates need for external reference in cost-sensitive applications; externally overridable. |
Pinout & Package
ADS7812B/1K is packaged in SO-16 (DW package), 3.9mm × 9.9mm body, 1.27mm pitch, RoHS-compliant surface-mount format - optimized for automated assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input Channel 1 | Primary differential or single-ended input node; configured with R2IN/R3IN/BUF to set gain/offset for ±10V, ±5V, or unipolar ranges. |
| GND (Pins 2 & 8) | Analog/Digital Ground Reference | Dual ground pins isolate analog return path from digital switching noise; requires star grounding for optimal 72dB SINAD performance. |
| R2IN, R3IN | Analog Input Channels 2 & 3 | Support multi-range configuration (e.g., R1IN=VIN, R2IN=BUF, R3IN=GND for 0V–10V); impedance >10MΩ in high-Z mode. |
| BUF | Reference Buffer Output | Provides buffered +2.5V for input scaling; drives R1IN/R2IN/R3IN to enable high-impedance input ranges without loading internal ref. |
| CAP | Reference Buffer Compensation | Requires 1µF tantalum || 0.01µF ceramic to ground - stabilizes BUF output and prevents oscillation during fast input transients. |
| REF | Reference Input/Output | Outputs internal +2.5V via 4kΩ series resistor; accepts external 2.3–2.7V reference to override internal source for improved stability. |
| DATACLK | Serial Clock I/O | Input when EXT/INT=HIGH (external clock); output when EXT/INT=LOW (internal clock synced to conversion cycle). |
| DATA | Serial Data Output | 12-bit Binary Two's Complement, MSB-first; tri-stated when CS=HIGH; valid on both edges of DATACLK in internal-clock mode. |
| CONV | Convert Trigger Input | Falling-edge initiated acquisition - starts conversion regardless of CS state; must be static during t2–t25 to avoid coupling into analog core. |
| CS | Chip Select | Active-low enables DATA, BUSY, and DATACLK (if EXT/INT=LOW); disables outputs when HIGH to support multi-device SPI buses. |
| BUSY | Conversion Status Output | Active-low open-drain signal indicating conversion in progress; doubles as frame sync for serial data in internal-clock mode. |
| PWRD | Power-Down Control | High-level entry into 50µW standby; requires CONV=LOW before assertion; recovery time ≤300µs with 1µF CAP decoupling. |
| VS | +5V Supply Input | Single 4.75–5.25V rail; requires 0.1µF ceramic || 10µF tantalum local decoupling to maintain 35mW dissipation and ±0.75LSB PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed monotonic transfer function across full temperature range - essential for position/speed feedback where code gaps cause control instability. |
| Multiple input ranges | 12+ configurable analog input spans (e.g., ±10V, 0.5V–4.5V) via resistor network - eliminates external op-amp level-shifting in multi-sensor DAQ systems. |
| Flexible serial interface | Hardware-selectable internal/external DATACLK with tri-state outputs - simplifies integration with both FPGA logic clocks and MCU SPI peripherals. |
| High input impedance | >10MΩ in 0.3V–2.8V range - enables direct connection to high-impedance sources (e.g., thermocouples, piezoelectric sensors) without buffer amplifiers. |
| Overvoltage tolerance | ±16.5V absolute max on R1IN/R3IN - protects against field-wiring faults in industrial PLC analog input modules. |
| Low power-down current | 50µW standby - extends battery life in portable test instruments and enables duty-cycled sampling in energy-harvesting sensor nodes. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage logging from pressure, temperature, and flow transmitters in factory automation panels. IC Role / Device Role / Timing Role: Primary 12-bit ADC digitizing 4–20mA loop outputs conditioned to 0V–10V range at 40kHz for real-time trend analysis. Use Value: ±0.5LSB linearity ensures <0.12% full-scale error in calibration-critical loop verification, reducing annual recalibration frequency. |
Use Scenario: Digitizing stimulus-response waveforms during functional testing of analog ICs and power supplies. IC Role / Device Role / Timing Role: High-SINAD front-end ADC capturing transient responses with 72dB SNR, synchronized to pattern generator triggers via CONV. Use Value: 72dB SINAD and 130kHz usable bandwidth support accurate THD/SFDR measurements per IEEE 1241 compliance. |
| Programmable Logic Controller (PLC) Analog Input Module | Embedded Digital Signal Processing Front-End |
|
Use Scenario: Modular I/O card accepting ±10V, ±5V, and 0–10V field signals from motors, valves, and encoders. IC Role / Device Role / Timing Role: Configurable-range ADC interfaced to ARM Cortex-M7 via SPI, with BUSY used for interrupt-driven data fetch. Use Value: Pin-compatible upgrade path from ADS7813 allows reuse of layout and firmware for 16-bit variants, lowering BOM management overhead. |
Use Scenario: Real-time audio and vibration signal acquisition in predictive maintenance edge nodes with FFT-based spectral analysis. IC Role / Device Role / Timing Role: Low-latency 40kHz sampling ADC feeding DMA to Cortex-M4 FPU for 1024-point FFT computation every 25ms. Use Value: 20µs conversion time and deterministic timing (t9 = 14–20µs) enable tight synchronization between sampling and processing pipelines. |
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 |
|---|---|---|---|
| ADS7813UB/1K | 16-bit resolution, same SO-16 pinout, 33% longer conversion time (≈26µs), identical interface and reference architecture. | Higher resolution required for precision metrology; same PCB layout but firmware must handle 16-bit words and adjusted timing. | Select when >12-bit ENOB is mandatory and system clock budget allows extended conversion cycles. |
| ADS8320EB/250 | 16-bit, 100kSPS, SPI-only interface (no BUSY), internal reference only, no input range flexibility, SO-8 package. | Compact, high-speed replacement where ±10V range and external reference are not needed; incompatible pinout and feature set. | Choose for space-constrained, high-throughput designs where input range configurability is secondary to speed and size. |
Compared with ADS7812B/1K, ADS7813UB/1K offers higher resolution at the cost of throughput and power, while ADS8320EB/250 trades configurability and diagnostic signaling (BUSY) for smaller footprint and faster rate - making ADS7812B/1K optimal for balanced industrial DAQ where flexibility, diagnostics, and thermal efficiency are prioritized.
Availability
ADS7812B/1K is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, programmable logic controller analog input modules, and embedded digital signal processing front-ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS7812B/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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADS7812B/1K belongs to TI's legacy precision SAR ADC family designed specifically for industrial data acquisition - emphasizing robustness, configurability, and ease of integration in harsh electromagnetic environments.
FAQ
What input voltage ranges does the ADS7812B/1K support, and how are they configured?
The ADS7812B/1K supports ±10V, ±5V, 0V–10V, 0.5V–4.5V, and high-impedance 0.3V–2.8V ranges. Configuration is achieved by connecting R1IN, R2IN, and R3IN to VIN, GND, or BUF per Table I in the datasheet. For example, ±10V uses R1IN=VIN, R2IN=BUF, R3IN=GND. The ADS7812B/1K's internal resistor network enables these configurations without external components.
Does the ADS7812B/1K require an external reference, or does it have an internal one?
The ADS7812B/1K includes an internal +2.5V reference (2.48–2.52V, 8ppm/°C drift) that is enabled by default. It can be overridden by applying a 2.3V–2.7V external reference to the REF pin. The ADS7812B/1K's internal reference eliminates BOM cost and board space in many applications, while retaining flexibility for higher-precision use cases.
How does the serial interface of the ADS7812B/1K operate with microcontrollers?
The ADS7812B/1K supports SPI-compatible communication with selectable internal or external DATACLK via the EXT/INT pin. In internal mode (EXT/INT=LOW), DATA and DATACLK are active during conversion, with BUSY serving as frame sync. In external mode (EXT/INT=HIGH), the user provides DATACLK after conversion completes. The ADS7812B/1K outputs 12-bit Binary Two's Complement, MSB-first, compatible with standard MCU SPI peripherals.
What is the power consumption profile of the ADS7812B/1K in active and power-down modes?
The ADS7812B/1K consumes up to 35mW at 40kHz sampling and +5V supply. In power-down mode (PWRD=HIGH), consumption drops to 50µW. Recovery to full accuracy takes ≤300µs after PWRD returns LOW, provided CONV is held LOW prior to power-down entry. This makes the ADS7812B/1K suitable for battery-powered or thermally sensitive applications requiring intermittent sampling.
Is the ADS7812B/1K pin-compatible with other devices in its family, and what does that mean for design reuse?
Yes - the ADS7812B/1K is pin-compatible with the 16-bit ADS7813 (same SO-16 DW package and pin functions). This allows shared PCB layout and firmware infrastructure; only software word-length handling and timing adjustments are needed when upgrading resolution. The ADS7812B/1K thus enables scalable design strategies across performance tiers without hardware redesign.
ADS7812B/1K 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:
- -
ADS7812B/1K FAQ
1.How can I place an order for ADS7812B/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7812B/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 ADS7812B/1K reliable?
The price and inventory of ADS7812B/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7812B/1K is usually 5 days.
3.What payment methods are accepted for ADS7812B/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7812B/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7812B/1K?
ADS7812B/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7812B/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 ADS7812B/1K?
For technical support, including ADS7812B/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7812B/1K requirements.
6.How does Aetrix verify that ADS7812B/1K is sourced from the original manufacturer or authorized distributors?
All ADS7812B/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 ADS7812B/1K meets industry standards.
7.What is the process for return or replacement of ADS7812B/1K?
All ADS7812B/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7812B/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 ADS7812B/1K part is unused and in its original packaging.
Return procedure for ADS7812B/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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