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Texas Instruments ADS7806U/1KE4
- Part No.:
- ADS7806U/1KE4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7806U/1KE4.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
ADS7806U/1KE4 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 parallel/serial digital outputs. It achieves full 12-bit accuracy in ≤25 µs while consuming ≤35 mW at 40 kHz throughput, supports ±10V, 0V–+5V, and 0V–+4V input ranges, and operates over –40°C to +85°C in SO-28 package - ideal for industrial data acquisition systems requiring precision, low power, and dual-output flexibility.
For engineers reviewing the ADS7806U/1KE4 datasheet, ADS7806U/1KE4 pinout, ADS7806U/1KE4 application, or ADS7806U/1KE4 equivalent, key selection considerations include its 25 µs max acquisition-and-conversion time, ±0.45 LSB max INL (UB grade), 72 dB min SINAD at 1 kHz, single +5V supply operation, and compatibility with both internal and external references - critical for embedded instrumentation, process control, and test equipment design.
Technical Context
The ADS7806U/1KE4 implements a fully integrated SAR architecture with on-chip capacitor DAC, comparator, and control logic, enabling self-contained conversion without external timing components. Its dual-mode interface supports byte-oriented parallel output (via D0–D7 with BYTE control) and synchronous serial output (via SDATA/DATACLK), configurable for Binary Two's Complement or Straight Binary coding via SB/BTC pin.
It features independent power-down (PWRD) and reference-disable (REFD) controls, allowing dynamic power management: PWRD HIGH reduces dissipation to 50 µW while preserving digital functionality, and REFD HIGH disables the internal 2.48–2.52 V reference to enable external reference use - essential for systems demanding enhanced DC accuracy or ratiometric measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88 mV LSB step size on ±10 V range, enabling sub-millivolt voltage resolution in industrial sensing. |
| Throughput Rate | 40 kHz - supports real-time sampling of signals up to ~130 kHz usable bandwidth (60 dB SINAD point). |
| INL / DNL | ±0.45 LSB max (UB grade) - ensures monotonicity and <0.01% full-scale linearity error for calibrated measurement systems. |
| SINAD | 72 dB min at 1 kHz - corresponds to ~9.7 effective bits, suitable for high-fidelity sensor digitization. |
| Power Dissipation | 35 mW max at 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 transducer outputs, unipolar sensors, and single-supply signal chains. |
| Reference | Internal +2.5 V (±0.1% initial accuracy, 8 ppm/°C drift) or external 2.3–2.7 V - allows flexible accuracy vs. system integration trade-offs. |
Pinout & Package
ADS7806U/1KE4 is housed in a 28-pin Small Outline (SO-28) package, 300 mil wide, RoHS-compliant, with standard JEDEC MO-026AC footprint and thermal resistance θJA = 75 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN | Analog Input (Primary) | Accepts ±12 V absolute max; configured for ±10 V, 0–+5 V, or 0–+4 V ranges via external resistor networks per Table I. |
| R2IN | Analog Input (Secondary) | Accepts ±5.5 V absolute max; used with R1IN for differential or dual-channel configurations. |
| CAP | Reference Buffer Output | Requires 2.2 µF tantalum capacitor to AGND2; stabilizes internal reference buffer for low-noise operation. |
| REF | Reference I/O | Connects 2.2 µF capacitor to AGND2; serves as output when internal ref enabled, input when external ref used. |
| 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) - defines serial timing source. |
| D0–D7 | Parallel Data Outputs | Tri-stateable; output MSB byte (BYTE = LOW) or LSB nibble (BYTE = HIGH); Hi-Z when CS HIGH or R/C LOW. |
| BUSY | Conversion Status Flag | Active-low open-drain output; goes LOW at conversion start, HIGH after result update - used for handshaking/latching. |
| R/C | Convert/Read Control | Falling edge initiates conversion; rising edge enables parallel output - dual-function pin simplifies microcontroller interface. |
| CS | Chip Select | Internally OR'ed with R/C; falling edge initiates conversion if R/C is HIGH - supports flexible control sequencing. |
| PWRD | Analog Power-Down | HIGH disables analog circuitry (sample-and-hold, reference, comparator) while preserving digital logic - enables ultra-low standby current. |
| REFD | Reference Disable | HIGH disables internal reference; required when using external reference - prevents conflict and ensures stable biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual supplies or LDOs - reduces BOM count and layout complexity in embedded systems. |
| Parallel and serial output modes | Enables direct connection to 8-bit microcontrollers (parallel) or space-constrained FPGAs (serial) without protocol translation. |
| Configurable input ranges (±10 V / 0–+5 V / 0–+4 V) | Supports legacy industrial sensors, modern unipolar ICs, and single-supply designs - no external level-shifting required. |
| Internal +2.5 V reference (8 ppm/°C drift) | Provides stable, factory-trimmed reference without external components - improves system-level accuracy and repeatability. |
| Power-down mode (50 µW) | Extends battery life in portable instrumentation and enables duty-cycled sampling architectures. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA loop transmitters, RTD bridges, and strain gauge amplifiers in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing analog field signals with ±10 V range support and 72 dB SINAD for noise-immune measurements. Use Value: Enables 12-bit resolution across full industrial temperature range (–40°C to +85°C) without recalibration, reducing maintenance overhead. | Use Scenario: High-speed stimulus-response testing of analog circuits using programmable voltage sources and precision comparators. IC Role / Device Role / Timing Role: Sampling front-end capturing transient waveforms at 40 kHz with 25 µs conversion latency for deterministic timing analysis. Use Value: Dual parallel/serial interface allows seamless integration with both legacy GPIB controllers and modern FPGA-based pattern generators. |
| Portable Data Loggers | Medical Instrumentation |
Use Scenario: Battery-powered environmental sensors logging temperature, pressure, and humidity over extended periods. IC Role / Device Role / Timing Role: Low-power ADC operating in burst mode with PWRD control to minimize average current draw during idle intervals. Use Value: 50 µW power-down current extends operational life; internal reference eliminates need for external precision voltage source. | Use Scenario: Patient vital sign monitors acquiring ECG, respiration, and blood oxygen signals with clinical-grade fidelity. IC Role / Device Role / Timing Role: Precision digitizer handling ±10 V biopotential amplifier outputs and unipolar sensor rails with <±0.45 LSB INL. Use Value: Meets IEC 60601-2-27 linearity requirements for diagnostic-grade waveform capture without post-processing correction. |
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 |
|---|---|---|---|
| ADS7805U | 12-bit, 10 µs conversion time, no internal reference, requires external 2.5 V ref; SO-24 package. | Lacks integrated reference and dual-range flexibility - suited only where external ref is already present and speed >25 µs is required. | Select when board space is constrained (SO-24) and system already provides precision reference; not drop-in due to pin count and ref dependency. |
| ADS8320EB | 16-bit, 2.2 µs conversion, SPI interface only, 5 V supply, SO-8 package; higher resolution but no parallel output. | Targeted at high-resolution, low-latency applications where 12-bit resolution is insufficient and microcontroller lacks parallel bus. | Choose for upgrade paths needing >12-bit accuracy and minimal latency; incompatible pinout and interface - requires PCB redesign. |
Compared with ADS7805U and ADS8320EB, the ADS7806U/1KE4 uniquely balances integrated reference, multi-range support, parallel/serial dual interface, and industrial temperature rating - making it optimal for cost-sensitive, mixed-signal industrial controllers where flexibility and ease of integration outweigh raw speed or resolution.
Availability
ADS7806U/1KE4 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and portable data loggers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADS7806U/1KE4 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 heritage in precision data converters and industrial-grade ICs.
The ADS7806U/1KE4 belongs to TI's legacy high-accuracy SAR ADC product line, designed specifically for industrial and instrumentation applications demanding robust performance across extended temperature ranges and multiple input configurations.
FAQ
What is the maximum conversion rate supported by the ADS7806U/1KE4?
The ADS7806U/1KE4 supports a maximum throughput rate of 40 kHz, corresponding to a complete acquisition-and-conversion cycle of ≤25 µs. This is achievable under specified conditions: TA = –40°C to +85°C, VANA = VDIG = +5 V, fS = 40 kHz, and using the internal reference. The device maintains full 12-bit accuracy within this timing constraint, making ADS7806U/1KE4 suitable for real-time data acquisition in industrial control loops.
Does the ADS7806U/1KE4 require external passive components to operate?
Yes, the ADS7806U/1KE4 requires two 2.2 µF tantalum capacitors: one between CAP and AGND2, and another between REF and AGND2, to stabilize the internal reference buffer. Additionally, decoupling capacitors - 0.1 µF ceramic and 10 µF tantalum - are mandatory on VANA and VDIG pins. External resistors are needed only when configuring non-default input ranges (e.g., ±10 V), per Table I in the datasheet. ADS7806U/1KE4 cannot operate reliably without these capacitors.
How does the BYTE pin affect data readout on the ADS7806U/1KE4?
The BYTE pin on ADS7806U/1KE4 selects data granularity on the parallel bus: when LOW, D7–D0 output the eight most significant bits (MSBs) of the 12-bit result; when HIGH, they output the four least significant bits (LSBs). This enables 8-bit microcontrollers to read the full conversion result in two sequential accesses. BUSY going HIGH indicates data validity, and toggling BYTE between reads allows complete 12-bit capture within one conversion cycle - a feature unique to ADS7806U/1KE4 among TI's 12-bit SAR portfolio.
Can the ADS7806U/1KE4 operate with an external reference, and what are the voltage requirements?
Yes, ADS7806U/1KE4 supports external reference operation when REFD is driven HIGH and a 2.3 V to 2.7 V reference is applied to the REF pin. The device guarantees specified linearity (±0.45 LSB INL) only within this range. External reference current drain is ≤100 µA at 2.5000 V, permitting use with low-output-impedance buffers or precision voltage references like REF5025. Using an external reference bypasses the internal 2.5 V source and improves full-scale accuracy stability in ratiometric or metrology-grade applications.
What is the purpose of the PWRD and REFD pins on the ADS7806U/1KE4?
PWRD (Pin 25) and REFD (Pin 26) provide independent power management: PWRD HIGH disables all analog circuitry (sample-and-hold, comparator, internal reference) while keeping digital logic active, reducing total supply current to 50 µW; REFD HIGH disables only the internal +2.5 V reference, allowing external reference use without analog section shutdown. Both pins are TTL-compatible inputs. This separation lets designers optimize power vs. functionality - e.g., keep digital interface alive during sleep (PWRD HIGH) while retaining option to re-enable analog path (PWRD LOW) without restarting reference (REFD LOW) - a capability confirmed in ADS7806U/1KE4's functional description.
ADS7806U/1KE4 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:
- -
ADS7806U/1KE4 FAQ
1.How can I place an order for ADS7806U/1KE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7806U/1KE4 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 ADS7806U/1KE4 reliable?
The price and inventory of ADS7806U/1KE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7806U/1KE4 is usually 5 days.
3.What payment methods are accepted for ADS7806U/1KE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7806U/1KE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7806U/1KE4?
ADS7806U/1KE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7806U/1KE4 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 ADS7806U/1KE4?
For technical support, including ADS7806U/1KE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7806U/1KE4 requirements.
6.How does Aetrix verify that ADS7806U/1KE4 is sourced from the original manufacturer or authorized distributors?
All ADS7806U/1KE4 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 ADS7806U/1KE4 meets industry standards.
7.What is the process for return or replacement of ADS7806U/1KE4?
All ADS7806U/1KE4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7806U/1KE4, 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 ADS7806U/1KE4 part is unused and in its original packaging.
Return procedure for ADS7806U/1KE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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