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Texas Instruments ADS7813U/1K
- Part No.:
- ADS7813U/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7813U/1K.pdf
- Description:
- IC ADC 16BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,156
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Product details
Overview
ADS7813U/1K from Texas Instruments is a low-power, single +5V supply, 16-bit sampling analog-to-digital converter (ADC) based on capacitor-based SAR architecture with integrated sample/hold, internal +2.5V reference, and SPI-compatible serial interface. It delivers 40kHz throughput, ±2.0LSB max INL, 87dB min SINAD, and supports multiple input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V - used in precision medical instrumentation and industrial data acquisition systems.
For engineers reviewing the ADS7813U/1K datasheet, ADS7813U/1K pinout, ADS7813U/1K application, or ADS7813U/1K equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SO-16 pin mapping, confirmed alternative options for 16-bit serial ADC replacement, and supply support for high-reliability embedded measurement designs.
Technical Context
The ADS7813U/1K implements a successive approximation register (SAR) ADC with integrated sample/hold, clock generation, and reference buffer circuitry. Its internal 2.5V reference (±8ppm/°C drift) can be overridden by an external 2.3V–2.7V source, and its flexible analog input configuration uses three dedicated pins (R1IN, R2IN, R3IN) wired to GND, VIN, or BUF to select among 16+ input ranges - including high-impedance >10MΩ modes.
It features dual serial clocking modes: internal DATACLK (output on Pin 9, synchronized to conversion) or external DATACLK (input on Pin 9), with Binary Two's Complement 16-bit MSB-first output. BUSY (Pin 14) serves as both conversion status indicator and frame sync signal, while PWRD (Pin 15) enables 50µW power-down mode with 300µs recovery time after CAP decoupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR - guarantees monotonicity and no missing codes across full temperature range. |
| Throughput Rate | 40kHz - enables real-time sampling of signals up to 130kHz useable bandwidth (60dB SINAD). |
| INL Error | ±2.0LSB max - ensures <0.003% full-scale linearity error for ±10V range (1 LSB = 305µV). |
| SINAD | 87dB min at 1kHz - supports >14.2 ENOB for high-fidelity signal capture in test equipment. |
| Power Dissipation | 35mW max at 40kHz - compatible with thermally constrained industrial PCB layouts. |
| Power-Down Mode | 50µW - reduces thermal load during idle periods without losing state or calibration. |
| Input Voltage Range | ±16.5V absolute max - allows overvoltage robustness beyond ±10V operating range. |
Pinout & Package
ADS7813U/1K is housed in a 16-pin SOIC (SO-16) package with 1.27mm pitch, JEDEC MS-012AC compliant, and 10.3mm × 7.5mm footprint - suitable for automated SMT assembly and space-constrained data acquisition modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 R1IN | Analog Input Channel 1 | Primary differential or single-ended input; configurable with R2IN/R3IN and BUF for ±10V, ±5V, or unipolar ranges. |
| 2 GND | Analog Ground | Reference return for analog circuitry; must be separated from digital ground per layout guidelines. |
| 3 R2IN | Analog Input Channel 2 | Secondary input node; combined with R1IN/R3IN to set gain/offset via resistor network topology. |
| 4 R3IN | Analog Input Channel 3 | Third input node enabling high-Z (>10MΩ) or buffered input configurations. |
| 5 BUF | Reference Buffer Output | Provides 2.5V buffered reference for input scaling; drives R1IN/R2IN/R3IN directly without loading. |
| 6 CAP | Reference Compensation Node | Requires 1µF tantalum + 0.01µF ceramic decoupling to stabilize internal reference buffer. |
| 7 REF | Reference I/O | Outputs internal 2.5V reference (4kΩ series impedance); accepts external 2.3–2.7V reference to override. |
| 8 GND | Digital Ground | Return path for digital I/O; tied to analog ground at single point near VS decoupling. |
| 9 DATACLK | Serial Clock I/O | Configurable as output (EXT/INT = LOW) or input (EXT/INT = HIGH); synchronizes 16-bit BTC data transfer. |
| 10 DATA | Serial Data Output | Tri-stated when CS = HIGH; outputs MSB-first Binary Two's Complement code aligned to DATACLK edges. |
| 11 EXT/INT | Clock Source Select | LOW = internal DATACLK generation; HIGH = external clock required for serial readout. |
| 12 CONV | Convert Trigger Input | Falling-edge initiated conversion; operates independently of CS state and initiates hold mode. |
| 13 CS | Chip Select | Active-low enable for all digital outputs; tri-states DATA/DATACLK/BUSY when HIGH. |
| 14 BUSY | Conversion Status Output | Active-low open-drain signal indicating conversion in progress; doubles as frame sync for serial data. |
| 15 PWRD | Power-Down Control | Active-high entry into 50µW standby; requires CONV = LOW before assertion for minimal current draw. |
| 16 VS | +5V Supply Input | Single 4.75–5.25V rail; requires 0.1µF ceramic + 10µF tantalum local decoupling for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| PIN-COMPATIBLE WITH ADS7812 | Enables drop-in upgrade from 12-bit to 16-bit resolution in existing DIP-16/SO-16 layouts without PCB revision. |
| MULTIPLE INPUT RANGES | 16+ programmable analog input configurations (e.g., ±10V, 0.5V–4.5V, high-Z >10MΩ) via external resistor wiring - no external op-amps needed. |
| INTERNAL +2.5V REFERENCE | 2.5V ±0.02V initial accuracy, 8ppm/°C drift, and 100µA sourcing capability - eliminates need for external reference IC in cost-sensitive designs. |
| EASY-TO-USE SERIAL INTERFACE | SPI-compatible timing with dual clock modes (internal/external DATACLK) and BUSY-as-frame-sync simplifies microcontroller firmware integration. |
| OVERVOLTAGE ROBUSTNESS | Withstands ±16.5V on R1IN/R3IN and –0.3V to +16.5V on R2IN - protects against transients in industrial sensor interfaces. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: High-accuracy ECG and patient monitoring front-ends requiring stable DC-coupled analog input with low noise and no missing codes. IC Role / Device Role / Timing Role: Primary 16-bit sampling ADC capturing biopotential signals at 40kHz with ±10V input range and internal reference stability. Use Value: 87dB SINAD and ±2.0LSB INL ensure diagnostic-grade fidelity; 50µW power-down extends battery life in portable units. |
Use Scenario: Modular rack-mounted DAQ modules for lab and field testing where channel density and thermal management are critical. IC Role / Device Role / Timing Role: Precision ADC in multi-channel synchronized sampling subsystem using external DATACLK for deterministic timing control. Use Value: SO-16 package enables compact layout; 40kHz throughput supports simultaneous sampling across 8+ channels with FPGA coordination. |
| Industrial Control | Test Equipment |
Use Scenario: Analog feedback loop conditioning in PLC I/O modules interfacing with 4–20mA sensors and ±10V actuator drivers. IC Role / Device Role / Timing Role: Isolated analog input stage ADC with configurable unipolar/bipolar ranges and robust ±16.5V fault tolerance. Use Value: Input range flexibility (e.g., 0.5V–4.5V for ratiometric sensors) reduces external component count; GND-referenced R2IN supports 4–20mA loop compliance. |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers needing high dynamic range digitization of baseband signals up to 130kHz. IC Role / Device Role / Timing Role: Front-end ADC providing 14.2+ ENOB performance with low aperture jitter (20ps) for accurate FFT-based analysis. Use Value: 90dB SFDR and 85dB SNR at 1kHz enable clean spectral representation; internal reference eliminates external trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8320EB/250 | 2.7V–5.5V supply, 100kSPS, SPI-only interface, no internal reference - requires external 2.5V ref. | Better speed and lower power, but lacks input range flexibility and overvoltage protection of ADS7813U/1K. | Select for battery-powered portable instruments needing higher throughput and lower active current. |
| MAX1166BCAP+ | Single +5V supply, 100kSPS, internal 4.096V reference, SPI interface, 16-pin TSSOP package. | Higher speed and tighter INL (±1LSB), but only supports ±4.096V and 0–4.096V ranges - no ±10V or high-Z modes. | Select when full-scale range matches 4.096V systems and board space permits TSSOP; not suitable for legacy ±10V sensor interfaces. |
Compared with ADS8320EB/250 and MAX1166BCAP+, the ADS7813U/1K uniquely combines ±10V input capability, internal 2.5V reference, overvoltage robustness, and pin compatibility with ADS7812 - making it optimal for retrofitting legacy 12-bit systems and industrial analog front-ends demanding wide-range flexibility without external support components.
Availability
ADS7813U/1K is available at Aetrix Electronics and suitable for medical instrumentation, industrial control, and test equipment requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant SO-16 packaging.
Supply support for ADS7813U/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, embedded processing, and high-reliability signal chain solutions with decades of precision data converter expertise.
The ADS7813U/1K belongs to TI's precision SAR ADC product line, designed specifically for high-accuracy, low-power, single-supply data acquisition in medical, industrial, and test environments where input range flexibility and robustness are critical.
FAQ
What is the maximum sampling rate supported by the ADS7813U/1K?
The ADS7813U/1K is specified for a maximum throughput rate of 40kHz across the full –40°C to +85°C temperature range. This corresponds to a 25µs complete cycle time (acquisition + conversion), with 20µs max conversion time. Performance remains stable under single +5V supply (4.75V–5.25V) and internal reference operation.
Does the ADS7813U/1K require an external reference voltage?
No - the ADS7813U/1K includes an internal +2.5V reference (2.48V–2.52V, 8ppm/°C drift) that can be used directly. However, Pin 7 (REF) accepts an external 2.3V–2.7V reference to override the internal source, enabling higher accuracy or custom full-scale scaling when needed.
How does the ADS7813U/1K handle overvoltage conditions on its analog inputs?
The ADS7813U/1K tolerates up to ±16.5V on R1IN and R3IN, and –0.3V to +16.5V on R2IN without damage. This overvoltage robustness protects the device in industrial environments with transient surges, though sustained operation outside specified input ranges (e.g., ±10V) may degrade accuracy or cause undefined behavior.
Can the ADS7813U/1K be used as a direct replacement for the ADS7812 in existing designs?
Yes - the ADS7813U/1K is pin-compatible with the 12-bit ADS7812 in both DIP-16 and SO-16 packages. While conversion time increases from ~15µs to 20µs and serial output shifts from 12 to 16 bits, no PCB changes are required, and firmware updates only need to read two additional LSBs.
What are the power consumption characteristics of the ADS7813U/1K in active and power-down modes?
In active operation at 40kHz, the ADS7813U/1K consumes ≤35mW (7mA @ +5V). In power-down mode (PWRD = HIGH), it draws ≤50µW - reducing thermal load and extending battery life. Recovery to full accuracy requires 300µs after exiting power-down, contingent on proper CAP decoupling.
ADS7813U/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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/1K FAQ
1.How can I place an order for ADS7813U/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7813U/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 ADS7813U/1K reliable?
The price and inventory of ADS7813U/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7813U/1K is usually 5 days.
3.What payment methods are accepted for ADS7813U/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7813U/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7813U/1K?
ADS7813U/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7813U/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 ADS7813U/1K?
For technical support, including ADS7813U/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7813U/1K requirements.
6.How does Aetrix verify that ADS7813U/1K is sourced from the original manufacturer or authorized distributors?
All ADS7813U/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 ADS7813U/1K meets industry standards.
7.What is the process for return or replacement of ADS7813U/1K?
All ADS7813U/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7813U/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 ADS7813U/1K part is unused and in its original packaging.
Return procedure for ADS7813U/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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