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Texas Instruments ADS7813U
- Part No.:
- ADS7813U
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7813U.pdf
- Description:
- IC ADC 16BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,101
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Product details
Overview
ADS7813U from Texas Instruments is a low-power, single-supply +5V, 16-bit sampling analog-to-digital converter (ADC) based on capacitor-based successive-approximation register (SAR) architecture. It integrates sample/hold, internal +2.5V reference, clock, and SPI-compatible serial interface. Key confirmed specs: 20 µs max conversion time, ±2.0 LSB max integral nonlinearity (INL), 87 dB min SINAD, 40 kHz sampling rate, and 35 mW max power dissipation. It serves in precision data acquisition systems requiring high resolution and robust input range flexibility.
For engineers reviewing the ADS7813U datasheet, ADS7813U pinout, ADS7813U application, or ADS7813U equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in medical instrumentation and industrial control, and two validated alternative parts with documented functional and application-level differences - all grounded in TI's SBAS043C production data sheet.
Technical Context
The ADS7813U implements a 16-bit SAR ADC core with integrated sample/hold, internal 2.48–2.52 V reference (8 ppm/°C drift), and configurable analog input ranges including ±10 V, ±5 V, 0 V to 10 V, and 0.5 V to 4.5 V. Input impedance exceeds 10 MΩ for high-Z mode, and absolute input tolerance reaches ±16.5 V without damage.
Its flexible serial interface supports both internal and external DATACLK modes: when EXT/INT = LOW, DATA and DATACLK are synchronized internally during conversion (16-bit MSB-first BTC output); when EXT/INT = HIGH, external clocking enables precise timing control with frame synchronization via BUSY. Power-down mode reduces consumption to 50 µW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR - delivers 1 LSB = 305 µV full-scale step for ±10 V range, enabling sub-millivolt measurement fidelity. |
| Conversion Time | 20 µs max - ensures minimum 40 kHz sustained sampling rate, suitable for real-time control loop feedback. |
| INL Error | ±2.0 LSB max (ADS7813UB grade) - guarantees monotonicity and <0.003% full-scale linearity error across temperature. |
| SINAD | 87 dB min at 1 kHz - supports >14 ENOB for clean signal capture in noise-sensitive applications like medical ECG. |
| Supply & Power | +5 V ±5% supply; 35 mW max active, 50 µW in power-down - enables battery-powered or thermally constrained designs. |
| Input Ranges | Configurable via pin strapping: ±10 V, ±5 V, 0–10 V, 0.5–4.5 V, and high-Z 0.3–2.8 V - eliminates external gain/level-shift circuitry. |
| Reference | Internal +2.5 V (±0.25% initial accuracy, 8 ppm/°C drift) or external 2.3–2.7 V - allows calibration-grade stability or system-level reference sharing. |
Pinout & Package
ADS7813U is housed in a 16-pin SOIC (SO-16) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (R1IN) | Analog input channel A | Primary differential or single-ended input; accepts ±16.5 V fault-tolerant swing; configured with R2IN/R3IN/BUF for 12+ input ranges. |
| 2, 8 (GND) | Analog/digital ground | Separate ground pins minimize digital switching noise coupling into analog front-end; requires star grounding per layout guidelines. |
| 9 (DATACLK) | Serial clock I/O | Configurable as output (EXT/INT = LOW) or input (EXT/INT = HIGH); provides synchronous timing for 16-bit MSB-first BTC data transfer. |
| 10 (DATA) | Serial data output | Tri-stateable, 16-bit Binary Two's Complement output; valid on rising/falling edges (internal clock) or falling edge only (external clock). |
| 12 (CONV) | Convert trigger input | Falling-edge–activated; initiates sample/hold and conversion independently of CS state; must be static during t2–t6 window to avoid noise injection. |
| 13 (CS) | Chip select | Active-low enable for all digital outputs (DATA, DATACLK, BUSY); allows multi-device SPI bus sharing without external gating. |
| 14 (BUSY) | Conversion status indicator | Active-low open-drain output; asserts LOW for entire 20 µs conversion + serial transfer; usable as frame sync or interrupt source. |
| 15 (PWRD) | Power-down control | High-active; reduces current to 10 µA typical; requires CONV LOW before PWRD assertion to achieve 50 µW min power state. |
| 16 (VS) | +5 V supply | Decoupling requires 0.1 µF ceramic + 10 µF tantalum to GND; ripple sensitivity is 10⁻⁴ LSB/LSB at 100 kHz, demanding clean LDO or filtered SMPS. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade path | Direct replacement for 12-bit ADS7812 in same SO-16 footprint - preserves PCB layout while doubling resolution without redesign. |
| Multiple precision input ranges | 12+ factory-specified configurations (e.g., ±10 V, 0.5–4.5 V) achieved via resistor network strapping - eliminates external op-amp gain stages. |
| No missing codes | Guaranteed 16-bit monotonicity across –40°C to +85°C - essential for closed-loop control where code gaps cause instability or limit cycles. |
| Robust overvoltage tolerance | Analog inputs survive ±16.5 V indefinitely - protects against transients in industrial fieldbus or motor drive feedback sensing. |
| Low-power serial interface | 50 µW power-down mode + tri-state outputs - enables integration into always-on sensor nodes with microamp-level sleep budgets. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
|
Use Scenario: High-fidelity ECG/EEG signal digitization in portable diagnostic devices with battery constraints. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing low-amplitude bio-potentials at 2–5 kSPS with DC-coupled input and ±5 V range. Use Value: 87 dB SINAD and ±2 LSB INL ensure accurate ST-segment analysis; 50 µW power-down extends battery life between measurements. |
Use Scenario: Modular rack-mounted DAQ modules for lab automation requiring calibrated voltage inputs up to ±10 V. IC Role / Device Role / Timing Role: Precision front-end ADC with internal reference and configurable range selection via FPGA-controlled BUF/RxIN routing. Use Value: Factory-trimmed ±10 V range and 8 ppm/°C reference drift eliminate per-channel calibration; SO-16 package enables dense channel count. |
| Industrial Control | Test Equipment |
|
Use Scenario: Analog feedback acquisition in servo drives monitoring motor phase currents and back-EMF. IC Role / Device Role / Timing Role: Isolated ADC input stage digitizing ±3.33 V or 0–4 V signals from current shunts or Hall sensors at 40 kHz. Use Value: ±16.5 V fault tolerance prevents latch-up during IGBT switching transients; 20 µs conversion enables real-time current loop bandwidth >10 kHz. |
Use Scenario: Benchtop multimeters and waveform analyzers requiring stable, low-noise DC and AC voltage measurement. IC Role / Device Role / Timing Role: Core ADC in auto-ranging subsystem, using internal reference and programmable input dividers for 100 mV–1000 V ranges. Use Value: 85–87 dB SINAD and <0.003% INL support 5½-digit DCV accuracy; external reference option enables traceable metrology-grade calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 2.7–5.5 V supply; 100 kSPS; SPI-only interface; no internal reference; 1.5 LSB INL (typ) | Requires external reference and level-shifting for ±10 V inputs; higher speed but less input flexibility | Choose for higher throughput in 3.3 V systems where external ref and signal conditioning already exist. |
| MAX1166EPE+ | ±5 V supply; 100 kSPS; internal 4.096 V ref; 1 LSB INL (max); DIP-16 only | Limited to unipolar 0–4.096 V range; no bipolar or high-Z modes; incompatible pinout | Choose for cost-sensitive benchtop instruments needing best-in-class INL, accepting unipolar-only operation and DIP packaging. |
Compared with ADS7813U, ADS8325IPW offers higher speed but demands external reference design effort and lacks fault-tolerant input protection, while MAX1166EPE+ achieves tighter INL yet sacrifices bipolar range support and SO-16 compatibility - making ADS7813U optimal for legacy-replacement, multi-range, and ruggedized embedded DAQ.
Availability
ADS7813U is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, and test equipment requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for ADS7813U 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 ADS7813U belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, and flexible-input data acquisition in harsh environments - targeting medical, industrial, and test equipment where reliability and configurability outweigh raw speed.
FAQ
What is the maximum sampling rate supported by the ADS7813U?
The ADS7813U is specified for a maximum throughput rate of 40 kHz across its full operating temperature range (–40°C to +85°C). This corresponds to a complete cycle time of 25 µs, comprising 5 µs acquisition and 20 µs conversion. At this rate, the device maintains all published DC and AC specifications including ±2.0 LSB INL and 87 dB SINAD - critical for real-time control and spectral analysis applications.
Does the ADS7813U require an external reference voltage?
No, the ADS7813U includes an internal +2.5 V reference (2.48–2.52 V, 8 ppm/°C drift) sufficient for most precision applications. However, it also supports external references from 2.3 V to 2.7 V applied to the REF pin, which overrides the internal source. This flexibility allows system-level reference sharing or metrology-grade calibration using a higher-accuracy external source - both modes are fully supported in the ADS7813U datasheet.
How does the ADS7813U handle overvoltage conditions on its analog inputs?
The ADS7813U analog inputs (R1IN, R2IN, R3IN) tolerate voltages up to ±16.5 V indefinitely without damage, exceeding standard ±10 V or ±5 V ranges. This fault tolerance is built into the front-end ESD structure and internal clamping, enabling safe operation in noisy industrial environments or during transient events like motor commutation spikes - a key reliability feature confirmed in the Absolute Maximum Ratings table of the ADS7813U datasheet.
Can the ADS7813U be used as a direct replacement for the ADS7812 in existing designs?
Yes, the ADS7813U is explicitly pin-compatible with the 12-bit ADS7812 in SO-16 and DIP-16 packages, sharing identical pin functions and layout. While conversion time increases from ~15 µs (ADS7812) to 20 µs (ADS7813U), the serial interface timing and control logic remain compatible - allowing resolution upgrades without PCB revision. TI confirms this interchangeability in the "Compatibility with the ADS7812" section of the ADS7813U datasheet.
What power-saving features does the ADS7813U offer for battery-powered applications?
The ADS7813U provides a dedicated PWRD (power-down) input that reduces supply current to ≤10 µA, achieving a total power dissipation of just 50 µW - ideal for intermittent-sampling sensor nodes. To enter this state, PWRD must be driven HIGH while CONV is held LOW. Recovery to full operation takes <300 µs after PWRD returns LOW, enabling rapid wake-up for event-triggered acquisition - all verified in the Electrical Characteristics and Power Down sections of the ADS7813U datasheet.
ADS7813U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- 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:
- -
ADS7813U FAQ
1.How can I place an order for ADS7813U through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7813U 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 ADS7813U reliable?
The price and inventory of ADS7813U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7813U is usually 5 days.
3.What payment methods are accepted for ADS7813U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7813U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7813U?
ADS7813U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7813U 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 ADS7813U?
For technical support, including ADS7813U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7813U requirements.
6.How does Aetrix verify that ADS7813U is sourced from the original manufacturer or authorized distributors?
All ADS7813U 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 ADS7813U meets industry standards.
7.What is the process for return or replacement of ADS7813U?
All ADS7813U units undergo pre-shipment inspection (PSI). If there is an issue with ADS7813U, 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 ADS7813U part is unused and in its original packaging.
Return procedure for ADS7813U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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