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Texas Instruments ADS7806UB/1K
- Part No.:
- ADS7806UB/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7806UB/1K.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,143
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Product details
Overview
ADS7806UB/1K from Texas Instruments is a low-power, 12-bit sampling CMOS analog-to-digital converter (ADC) featuring a capacitor-based successive approximation register (SAR), integrated sample-and-hold, internal +2.5V reference, and dual parallel/serial digital interface. It achieves full 12-bit accuracy in ≤25 µs while consuming only 35 mW max at 40 kHz throughput, supporting ±10V, 0V to +5V, and 0V to +4V input ranges - enabling single-supply system design in industrial data acquisition.
For engineers reviewing the ADS7806UB/1K datasheet, ADS7806UB/1K pinout, ADS7806UB/1K application, or ADS7806UB/1K equivalent, key selection criteria include its 72 dB min SINAD at 1 kHz, ±0.45 LSB max INL/DNL, power-down mode (50 µW), and SO-28 package compatibility with the ADS7807 for scalable resolution upgrades.
Technical Context
The ADS7806UB/1K implements a fully integrated SAR architecture with on-chip capacitor DAC, comparator, control logic, and clock generation. Its analog front-end supports three user-selectable input ranges via external resistor networks, and it accepts either internal (2.5 V ±20 mV) or external (2.3–2.7 V) references with laser-trimmed scaling resistors ensuring ±10 V range linearity.
Digital interfacing is flexible: parallel output delivers 12-bit data in two 8-bit bytes (MSB/LSB selectable via BYTE pin), while serial output provides MSB-first BTC or SB format synchronized to internal (≈900 kHz) or external (DC–10 MHz) clocks. BUSY pin signals conversion completion and data validity, and CS/R/C timing controls acquisition, conversion, and output enable independently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88 mV LSB step size on ±10 V range for high-precision voltage measurement. |
| Throughput Rate | 40 kHz - enables real-time sampling of signals up to 130 kHz usable bandwidth (60 dB SINAD). |
| INL / DNL | ±0.45 LSB max - ensures monotonicity and <0.01% full-scale linearity error across industrial temperature range. |
| SINAD | 72 dB min at 1 kHz - supports >11.6 effective number of bits (ENOB) for dynamic signal fidelity. |
| Power Dissipation | 35 mW max at 5 V / 40 kHz - enables thermally constrained designs; drops to 50 µW in power-down mode. |
| Input Ranges | ±10 V, 0–5 V, 0–4 V - accommodates bipolar sensor outputs and unipolar microcontroller interfaces without external level-shifting. |
| Reference | Internal 2.500 V ±20 mV (8 ppm/°C drift) or external 2.3–2.7 V - eliminates need for external precision reference in cost-sensitive systems. |
Pinout & Package
ADS7806UB/1K is housed in a 28-pin SOIC (SO-28) package, 0.3" wide, fully specified for –40°C to +85°C operation. Pin spacing is 0.050", body width 0.300", and lead count matches the DIP-28 variant for layout compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input (Primary) | Accepts ±12 V max; configured for ±10 V range using 200 Ω series resistor and fixed scaling network. |
| R2IN | Analog Input (Secondary) | Accepts ±5.5 V max; used with R1IN for differential or dual-channel input configurations per Figure 7. |
| CAP | Reference Buffer Output | Requires 2.2 µF tantalum capacitor to AGND2; stabilizes internal reference buffer for low-noise conversion. |
| REF | Reference I/O | Connects to 2.2 µF cap to AGND2 when using internal ref; accepts external 2.3–2.7 V reference when REFD = HIGH. |
| SB/BTC | Data Format Select | HIGH = Straight Binary; LOW = Binary Two's Complement - determines sign encoding for bipolar inputs. |
| EXT/INT | Clock Source Select | LOW = internal DATACLK (~900 kHz); HIGH = external clock (DC–10 MHz) applied to DATACLK pin. |
| D7–D0 | Parallel Data Outputs | Tri-stateable; output 8-bit segments of 12-bit result - MSB byte when BYTE = LOW, LSB nibble when BYTE = HIGH. |
| BUSY | Conversion Status | Active-low open-drain output; goes LOW at conversion start and returns HIGH only after data registers update and settle. |
| R/C | Convert/Read Control | Falling edge initiates conversion when CS = LOW; rising edge enables parallel output latch when CS = LOW. |
| CS | Chip Select | Internally OR'ed with R/C; falling edge initiates conversion if R/C = HIGH; enables serial output when R/C = HIGH. |
| PWRD | Power-Down Enable | HIGH disables analog circuitry (sample-and-hold, reference, comparator) but leaves digital logic active for fast wake-up. |
| REFD | Reference Disable | HIGH disables internal 2.5 V reference; required when using external reference to avoid conflict and current contention. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates dual-rail supplies and simplifies PCB power delivery for embedded industrial controllers. |
| Pin-compatible with ADS7807 | Enables hardware reuse across 12-bit and 16-bit resolution tiers without layout changes or redesign effort. |
| Parallel + serial dual interface | Supports resource-constrained MCUs (serial) and high-speed DSPs/FPGAs (parallel) from same footprint. |
| Three programmable input ranges | Reduces BOM count by eliminating external gain/attenuation stages for ±10 V sensors, 0–5 V ADCs, and 0–4 V PLC I/O. |
| 50 µW power-down mode | Extends battery life in portable instrumentation; wake-up time <1 ms due to retained digital state and reference bias. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous voltage monitoring of 4–20 mA loop transmitters conditioned to ±10 V via precision shunt and op-amp circuitry. IC Role / Device Role / Timing Role: Primary 12-bit digitizer acquiring analog sensor outputs at 40 kHz with 72 dB SINAD for FFT-based spectral analysis. Use Value: ±0.45 LSB INL ensures calibrated accuracy over –40°C to +85°C without field recalibration; SO-28 package fits dense industrial I/O modules. |
Use Scenario: Digitizing AC line voltage and current waveforms in portable power quality analyzers with anti-aliasing filtering. IC Role / Device Role / Timing Role: High-fidelity SAR ADC capturing 50/60 Hz fundamentals plus harmonics up to 130 kHz usable bandwidth. Use Value: 72 dB SINAD at 1 kHz and 130 kHz usable bandwidth support Class A power metering compliance; internal reference reduces component count. |
| Programmable Logic Controller (PLC) Analog Input Modules | Medical Instrumentation Signal Chain |
|
Use Scenario: Isolated analog input stage in DIN-rail mounted PLCs accepting multiple field sensor types (thermocouple, RTD, strain gauge). IC Role / Device Role / Timing Role: Precision front-end ADC with configurable ±10 V / 0–5 V ranges, supporting software-selectable sensor excitation and scaling. Use Value: Laser-trimmed scaling resistors and ±0.45 LSB linearity eliminate per-channel calibration; 50 µW power-down extends module thermal margin. |
Use Scenario: Biopotential signal digitization in ECG/EMG devices requiring low-noise, low-power, and small form factor. IC Role / Device Role / Timing Role: Low-power 12-bit ADC sampling filtered bio-signals at 1–10 kHz with minimal self-heating in sealed enclosures. Use Value: 35 mW max dissipation and SO-28 footprint enable compact, fanless medical device designs; internal 2.5 V reference improves PSRR vs. noisy digital supplies. |
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 |
|---|---|---|---|
| ADS7805UB | 12-bit, 20 µs conversion time, 30 mW typical power, no internal reference - requires external 2.5 V reference. | Lacks internal reference and ±10 V range support; suited for space-constrained designs where external ref already exists. | Select when board-level 2.5 V reference is shared across multiple ICs and faster acquisition (<20 µs) is prioritized over integration. |
| ADS8320EB | 16-bit, 2.5 µs conversion, SPI-only interface, 2.7–5.5 V supply, 12 mW at 100 kSPS - higher resolution, lower power, serial-only. | No parallel interface or ±10 V range; optimized for low-power, high-resolution portable instruments with SPI host. | Choose for upgrade paths requiring >12-bit ENOB and SPI-native microcontrollers, accepting loss of ±10 V input and parallel bus support. |
Compared with ADS7805UB and ADS8320EB, the ADS7806UB/1K uniquely balances integrated reference, ±10 V input capability, parallel/serial flexibility, and industrial temperature rating - making it optimal for retrofitting legacy 12-bit systems needing minimal interface change and full-range analog support.
Availability
ADS7806UB/1K is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, PLC analog input modules, and medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for ADS7806UB/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 connectivity technologies with over 50 years of precision data converter innovation.
The ADS7806UB/1K belongs to TI's precision SAR ADC product line, designed specifically for industrial and instrumentation applications demanding high DC accuracy, low power, and flexible digital interfacing in harsh environments.
FAQ
What is the maximum sampling rate supported by the ADS7806UB/1K?
The ADS7806UB/1K supports a maximum throughput rate of 40 kHz, corresponding to a complete acquire-and-convert cycle of ≤25 µs. This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) with VANA = VDIG = +5 V and internal reference enabled. At this rate, the ADS7806UB/1K maintains 72 dB minimum SINAD and ±0.45 LSB linearity performance.
Does the ADS7806UB/1K require an external reference voltage?
No, the ADS7806UB/1K includes a laser-trimmed internal 2.500 V ±20 mV reference with 8 ppm/°C drift, sufficient for most industrial applications. An external reference (2.3–2.7 V) may be used by asserting REFD = HIGH and connecting to the REF pin - but doing so disables the internal reference to prevent conflict. The ADS7806UB/1K reference architecture is fully validated in the SBAS021B datasheet.
How does the power-down mode function on the ADS7806UB/1K?
Asserting PWRD = HIGH on the ADS7806UB/1K shuts down all analog circuitry - including sample-and-hold, comparator, and reference buffer - reducing total power to 50 µW while keeping digital logic (BUSY, CS, R/C, BYTE) fully operational. Wake-up time is <1 ms, and conversion accuracy resumes immediately upon clearing PWRD, as confirmed in Section 6.5 of the ADS7806UB/1K datasheet.
Can the ADS7806UB/1K interface directly with a microcontroller lacking an external memory bus?
Yes, the ADS7806UB/1K supports serial output via SDATA and DATACLK pins, compatible with both internal (≈900 kHz) and external (DC–10 MHz) clocks. When EXT/INT = LOW, it generates its own clock; when EXT/INT = HIGH, it synchronizes to an MCU-provided clock - enabling direct connection to SPI-capable or GPIO-timed microcontrollers without parallel bus resources.
What input voltage ranges does the ADS7806UB/1K support, and how are they selected?
The ADS7806UB/1K supports three factory-configured input ranges: ±10 V, 0 V to +5 V, and 0 V to +4 V. Selection is achieved via external resistor networks per Table I and Figure 7 of the datasheet - no internal register writes or configuration commands are needed. Each range uses dedicated impedance matching (e.g., 200 Ω for ±10 V) to maintain specified INL/DNL and bandwidth performance.
ADS7806UB/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- 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:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7806UB/1K FAQ
1.How can I place an order for ADS7806UB/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7806UB/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 ADS7806UB/1K reliable?
The price and inventory of ADS7806UB/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7806UB/1K is usually 5 days.
3.What payment methods are accepted for ADS7806UB/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7806UB/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7806UB/1K?
ADS7806UB/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7806UB/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 ADS7806UB/1K?
For technical support, including ADS7806UB/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7806UB/1K requirements.
6.How does Aetrix verify that ADS7806UB/1K is sourced from the original manufacturer or authorized distributors?
All ADS7806UB/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 ADS7806UB/1K meets industry standards.
7.What is the process for return or replacement of ADS7806UB/1K?
All ADS7806UB/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7806UB/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 ADS7806UB/1K part is unused and in its original packaging.
Return procedure for ADS7806UB/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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