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Texas Instruments ADS7812UB
- Part No.:
- ADS7812UB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7812UB.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
ADS7812UB 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, ±0.5LSB INL/DNL, and 72dB SINAD - deployed in industrial data acquisition systems requiring precision, low power, and flexible signal conditioning.
For engineers reviewing the ADS7812UB datasheet, ADS7812UB pinout, ADS7812UB application, or ADS7812UB equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value per application, and two confirmed alternative ADCs with documented functional and layout implications for embedded control, test equipment, and DSP front-end designs.
Technical Context
The ADS7812UB implements a successive approximation register (SAR) architecture with a fully integrated 12-bit capacitor DAC, internal 2.5V reference (±0.1% initial accuracy, 8ppm/°C drift), and configurable analog input routing via three independent input terminals (R1IN, R2IN, R3IN) tied to GND, BUF, or VIN to select among 16+ input ranges. Its serial interface operates in either internal-clock mode (DATACLK output, MSB-first BTC format, dual-edge valid) or external-clock mode (DATACLK input, falling-edge valid), with BUSY signaling conversion status and CONV initiating conversions independently of CS state.
It features a 50µW power-down mode activated by PWRD, supports ±16.5V fault-tolerant analog inputs without damage, and achieves 72dB SINAD at 1kHz with 130kHz usable bandwidth. The device uses a 16-pin SOIC package (DW suffix), specified over –40°C to +85°C, and maintains no missing codes across its full 12-bit range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete levels with monotonic transfer and no missing codes. |
| Throughput Rate | 40kHz - enables real-time sampling of signals up to 20kHz (Nyquist-limited) in continuous acquisition. |
| INL / DNL | ±0.5LSB max - ensures high code-linearity critical for closed-loop control and calibration-sensitive measurements. |
| SINAD | 72dB min - supports >11.5 effective bits at 1kHz, suitable for medium-precision instrumentation. |
| Power Dissipation | 35mW max at 40kHz - enables thermally constrained PCB layouts and battery-backed operation with 50µW standby. |
| Input Ranges | ±10V, ±5V, 0–10V, 0.5–4.5V, and high-Z 0.3–2.8V - allows direct interfacing to sensors, transducers, and industrial voltage outputs without external scaling. |
| Reference | Internal +2.5V (±0.1%, 8ppm/°C) or external 2.3–2.7V - eliminates need for external reference IC in most applications. |
Pinout & Package
ADS7812UB is housed in a 16-pin SOIC package (JEDEC MS-012, DW suffix), 7.5mm × 10.3mm body, 1.27mm pitch, with gull-wing leads and exposed pad not present. Pin numbering follows standard SOIC top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input Channel 1 | Primary differential or single-ended input node; configured with R2IN/R3IN/BUF/GND to set input range and impedance (e.g., ±10V when R1IN→VIN, R2IN→BUF, R3IN→GND). |
| GND (Pin 2) | Analog Ground Reference | Low-impedance return path for analog circuitry; must be separated from digital ground and connected near CAP/REF decoupling. |
| R2IN | Analog Input Channel 2 | Secondary input node used with R1IN/R3IN to configure bipolar/unipolar ranges and gain; tolerates –0.3V to +16.5V. |
| R3IN | Analog Input Channel 3 | Third input node enabling extended range configurations (e.g., 0.5–4.5V when R1IN→GND, R2IN→VIN, R3IN→GND); shares same absolute max ratings. |
| BUF | Reference Buffer Output | Provides buffered +2.5V for input scaling; drives R1IN/R2IN/R3IN directly; requires no external buffer for ≤10kΩ loads. |
| CAP | Reference Buffer Compensation | Stabilizes internal reference buffer; must be decoupled to GND with 1µF tantalum || 0.01µF ceramic. |
| REF | Reference I/O | Outputs internal 2.5V via 4kΩ series resistor; accepts external 2.3–2.7V reference to override internal source. |
| GND (Pin 8) | Digital Ground Reference | Return for digital I/O; should be tied to analog ground at single point near VS decoupling. |
| DATACLK | Serial Clock I/O | Configurable as output (EXT/INT = LOW) or input (EXT/INT = HIGH); synchronizes 12-bit BTC data on rising/falling edges. |
| DATA | Serial Data Output | Tri-state MSB-first Binary Two's Complement output; valid during BUSY LOW; disabled when CS = HIGH. |
| EXT/INT | Serial Clock Source Select | LOW = internal DATACLK generation; HIGH = external clock required; does not affect conversion clock (always internal). |
| CONV | Convert Trigger Input | Falling-edge initiated conversion; active regardless of CS state; ignores re-triggering during ongoing conversion. |
| CS | Chip Select | Active-low enable for DATA, BUSY, and DATACLK (when EXT/INT = LOW); does not gate CONV functionality. |
| 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 | Active-high entry to 50µW standby; requires CONV LOW before assertion for minimum current; recovery time depends on REF/CAP settling. |
| VS | +5V Supply Input | Single 4.75–5.25V supply; requires local decoupling: 0.1µF ceramic || 10µF tantalum to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Input Range Selection | 16+ programmable analog input configurations (e.g., ±10V, 0–10V, 0.5–4.5V) via external pin strapping - eliminates external op-amp level-shifting in multi-sensor systems. |
| Integrated Reference & Buffer | On-chip +2.5V reference (±0.1%, 8ppm/°C) with dedicated BUF output and CAP compensation node - reduces BOM count and layout sensitivity vs. external references. |
| Two-Mode Serial Interface | Switchable between internal-clock (self-timed, dual-edge valid) and external-clock (user-controlled timing) modes - simplifies integration with microcontrollers lacking precise SPI timing control. |
| Robust Analog Input Protection | ±16.5V fault tolerance on R1IN/R2IN/R3IN - enables direct connection to industrial field wiring without external clamping diodes or series resistors. |
| No Missing Codes Guarantee | Monotonic 12-bit transfer function across full temperature range - essential for position feedback, servo control, and safety-critical monitoring where code gaps cause system instability. |
Applications
| Data Acquisition Systems | Industrial Process Control |
|---|---|
Use Scenario: High-channel-count PLC analog input modules acquiring sensor data (thermocouples, RTDs, 4–20mA transmitters) in noisy factory environments. IC Role / Device Role / Timing Role: Primary 12-bit ADC front-end converting conditioned analog signals to digital for FPGA or MCU processing; synchronized via CONV pulses from system timer. Use Value: ±10V input range and ±16.5V fault tolerance eliminate external protection components; 40kHz throughput supports oversampling for noise reduction in 50/60Hz EMI environments. | Use Scenario: Closed-loop motor drive current/voltage sensing with real-time feedback for torque and speed regulation. IC Role / Device Role / Timing Role: Precision current shunt measurement ADC feeding PWM controller; triggered by CONV edge aligned with switching cycle dead-time. Use Value: ±0.5LSB INL ensures <0.012% gain error in current loop calibration; internal reference removes drift dependency on external supply rails. |
| Automated Test Equipment (ATE) | DSP-Based Signal Conditioning |
Use Scenario: Benchtop multimeter or waveform analyzer capturing DC/AC voltage with selectable ranges and auto-ranging logic. IC Role / Device Role / Timing Role: Core sampling ADC in measurement engine; input range dynamically reconfigured via R1IN/R2IN/R3IN strapping under MCU control. Use Value: Multiple validated input ranges (±5V, 0–10V, 0.5–4.5V) enable single-hardware platform for multiple measurement classes without redesign. | Use Scenario: Audio pre-processing board digitizing line-level or microphone signals prior to FFT or filtering in TI C5000 DSP. IC Role / Device Role / Timing Role: Low-noise, low-power ADC feeding serial port of DSP; uses internal DATACLK mode for deterministic timing and BUSY as frame sync. Use Value: 72dB SINAD and 130kHz usable bandwidth preserve dynamic range for 20kHz audio; 50µW power-down extends battery life in portable analyzers. |
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 | 16-bit resolution, same pinout and interface, 33% longer conversion time (≈27µs), higher power (45mW), identical input flexibility and reference architecture. | Required where >12-bit ENOB is needed for high-fidelity sensor fusion or metrology; not drop-in due to timing and software word-length changes. | Select ADS7813UB only if 16-bit resolution justifies increased latency and firmware adaptation; ADS7812UB remains optimal for cost- and speed-sensitive 12-bit use cases. |
| ADS8320EB | 16-bit, 100kSPS, SPI-only interface (no EXT/INT mode), no internal reference, requires external 2.5V ref, SO-16 package, higher SNR (86dB). | Used in higher-speed, higher-accuracy applications where external reference stability is controlled; lacks ADS7812UB's input range configurability and fault tolerance. | Choose ADS8320EB when sampling rate >40kHz and SNR >72dB are mandatory; ADS7812UB preferred when system-level simplicity, ±16.5V robustness, and multi-range support outweigh raw resolution. |
Compared with ADS7813UB and ADS8320EB, the ADS7812UB uniquely balances 12-bit precision, 40kHz throughput, ±16.5V input ruggedness, and on-chip reference - making it the optimal choice for industrial DAQ and control where reliability, ease of use, and BOM reduction are prioritized over maximum resolution or speed.
Availability
ADS7812UB is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and DSP-based signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for ADS7812UB 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 ADS7812UB belongs to TI's legacy precision SAR ADC family, engineered specifically for cost-effective, low-power, high-reliability data acquisition in harsh industrial and test environments - emphasizing configurability, fault tolerance, and minimal external component count.
FAQ
What is the maximum sampling rate supported by the ADS7812UB?
The ADS7812UB is specified for a maximum throughput rate of 40kHz across its full operating temperature range (–40°C to +85°C). This corresponds to a complete conversion cycle - including acquisition and conversion - of 25µs. At this rate, the ADS7812UB delivers guaranteed 12-bit performance with ±0.5LSB INL/DNL and 72dB SINAD using its internal reference. Higher rates are not characterized and may degrade accuracy.
Does the ADS7812UB require an external reference voltage?
No, the ADS7812UB does not require an external reference voltage. It integrates a precision +2.5V internal reference (2.48V to 2.52V, ±0.1% initial accuracy, 8ppm/°C drift) with a dedicated BUF output and CAP compensation node. An external reference (2.3V to 2.7V) may be applied to the REF pin to override the internal source - but this is optional and used only when higher stability or custom full-scale scaling is needed.
How does the ADS7812UB handle overvoltage conditions on its analog inputs?
The ADS7812UB tolerates up to ±16.5V on R1IN, R2IN, and R3IN without damage - exceeding its specified input ranges (e.g., ±10V, 0–10V). This fault tolerance is built into the input structure and does not require external clamping components. However, sustained overvoltage beyond absolute maximum ratings degrades long-term reliability, and input impedance varies ±30% due to internal resistor tolerances - so precision applications should operate within datasheet-specified ranges.
Can the ADS7812UB be used with a microcontroller that lacks native SPI hardware?
Yes, the ADS7812UB can be interfaced with microcontrollers lacking native SPI hardware. Its serial interface supports both internal-clock mode (DATACLK output, dual-edge data valid) and external-clock mode (DATACLK input, falling-edge valid). In internal-clock mode, the microcontroller only needs GPIOs to monitor BUSY and read DATA - eliminating timing-critical clock generation. Software bit-banging is also feasible given the 40kHz max rate and well-defined timing windows (e.g., t16 = 20ns setup to DATACLK rising edge).
What is the purpose of the BUF and CAP pins on the ADS7812UB?
The BUF pin provides a buffered +2.5V output from the internal reference, used to bias R1IN/R2IN/R3IN for specific input range configurations (e.g., ±10V range requires BUF connected to R2IN). The CAP pin is the compensation node for the reference buffer amplifier and must be decoupled to GND with a 1µF tantalum capacitor in parallel with a 0.01µF ceramic capacitor - failure to do so causes reference instability and degraded AC performance (SINAD, SFDR).
ADS7812UB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7812UB FAQ
1.How can I place an order for ADS7812UB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7812UB 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 ADS7812UB reliable?
The price and inventory of ADS7812UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7812UB is usually 5 days.
3.What payment methods are accepted for ADS7812UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7812UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7812UB?
ADS7812UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7812UB 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 ADS7812UB?
For technical support, including ADS7812UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7812UB requirements.
6.How does Aetrix verify that ADS7812UB is sourced from the original manufacturer or authorized distributors?
All ADS7812UB 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 ADS7812UB meets industry standards.
7.What is the process for return or replacement of ADS7812UB?
All ADS7812UB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7812UB, 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 ADS7812UB part is unused and in its original packaging.
Return procedure for ADS7812UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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