ADS7806U/1K - 12-Bit 40kHz SAR ADC, Parallel/Serial, SOIC-28 | TI
MPN: ADS7806U/1K ✓ פעילADS7806U/1K סקירה
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that quantizes a continuous analog voltage into a discrete digital code. SAR (Successive-Approximation Register) ADCs convert one bit per clock cycle by comparing the input against an internal DAC, making them well suited for medium-speed, medium-resolution data acquisition. The ADS7806 sits in the SAR ADC family -> data acquisition ICs -> mixed-signal ICs -> integrated circuits, offering both parallel and serial data output interfaces.
Key features include 35 mW maximum power dissipation, a 50 uW power-down mode for battery-friendly operation, +/-1/2 LSB maximum INL and DNL, and 72 dB minimum SINAD at 1 kHz input. The input range spans 0V to +5V (with software configuration to +/-5V and +/-4V), and the device operates from a single +5V supply. The combination of low power, parallel+serial interface, and single-supply operation makes it a flexible drop-in for embedded data acquisition.
The architecture uses a capacitive-charge-distribution DAC with a sample-and-hold front end and an on-chip clock. The conversion is initiated by a CONVST pulse, and the result is available on either the parallel DB0-DB11 bus or a SPI-compatible serial port with internal/external clock option. Hardware byte-select pins let the host read high and low bytes sequentially on the parallel bus.
Typical applications include industrial process control, portable instrumentation, data acquisition systems, and battery-powered sensor digitizers. The 50 uW power-down current is critical for handheld medical or field instruments where the ADC is idle most of the time.
When designing with this device, ensure the input is within the source-impedance budget specified in the manufacturer datasheet to avoid conversion-time violations; the S/H front end must be fully settled in 25 us. Use a clean +5V analog supply with adequate decoupling, and route digital outputs away from the analog input traces to limit digital feedthrough.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the manufacturer datasheet and distributor listings.
חלופות תחליף ישיר עבור ADS7806U/1K — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS7806U/1K (אותו גורם צורה וטביעת רגל) — שונים ב Package, Resolution, Architecture, Number of Channels, Reference.
ADS7806U
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7807U
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7805PB
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7806PG4
צור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7813UB/1K
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS7806U/1K דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 12 bits |
| Architecture | SAR (Successive-Approximation) |
| Number of Channels | 1 input, single-ended |
| Sample Rate | 40 kS/s max |
| Acquisition + Conversion Time | 25 us max |
| טווח מתח כניסה | 0 V to +5 V (also +/-5 V, +/-4 V modes) |
| מתח אספקה | +5 V single supply |
| Power Dissipation | 35 mW max |
| Power-Down Current | 50 uW max |
| INL (Max) | +/-1/2 LSB |
| DNL (Max) | +/-1/2 LSB |
| SINAD | 72 dB min @ 1 kHz input |
| Data Output Interface | Parallel and Serial (SPI-compatible) |
| מארז | 28-SOIC |
| טווח טמפרטורת פעולה | -40 C to +85 C |
| סטטוס RoHS | Compliant |
תצורת פינים של ADS7806U/1K
| פין 1 | ANALOG IN — Analog input to ADC sample-and-hold |
| פין 2 | +VREF — Reference voltage input (positive) |
| פין 3 | REF GND — Reference ground return |
| פין 4 | AGND — Analog ground |
| פין 5 | DB11 (MSB) — Parallel data bit 11 (MSB) |
| פין 6 | DB10 — Parallel data bit 10 |
| פין 7 | DB9 — Parallel data bit 9 |
| פין 8 | DB8 — Parallel data bit 8 |
| פין 9 | DB7 — Parallel data bit 7 |
| פין 10 | DB6 — Parallel data bit 6 |
| פין 11 | DB5 — Parallel data bit 5 |
| פין 12 | DB4 — Parallel data bit 4 |
| פין 13 | DB3 — Parallel data bit 3 |
| פין 14 | DB2 — Parallel data bit 2 |
| פין 15 | DB1 — Parallel data bit 1 |
| פין 16 | DB0 (LSB) — Parallel data bit 0 (LSB) |
| פין 17 | HBEN — High byte enable for parallel bus |
| פין 18 | BYSL — Byte select (high/low) |
| פין 19 | R/C — Read/Conversion control |
| פין 20 | CS — Chip select (active low) |
| פין 21 | BUSY — Conversion in progress output |
| פין 22 | CONVST — Conversion start input |
| פין 23 | SCLK/EXTCLK — Serial clock / external clock input |
| פין 24 | DOUT — Serial data output (SPI-compatible) |
| פין 25 | DGND — Digital ground |
| פין 26 | VDD — +5 V digital supply |
| פין 27 | RANGE — Input range select (0-5V / +/-5V / +/-4V) |
| פין 28 | PWRDN — Power-down control input |
יישומים טיפוסיים
ADS7806U/1K מתאים עבור 6 יישוםs: Industrial Process Control Data Acquisition, Portable Battery-Powered Instrumentation, Data Acquisition Front Ends for PLCs, Sensor Signal Digitization (Temperature, Strain, Pressure), Medical and Point-of-Care Diagnostic Devices, Automotive Sensor Interfaces (Non-Safety).
Industrial Process Control Data Acquisition
The ADS7806U/1K is well-suited for industrial process-control analog front ends because of its 0 V to +5 V and +/-5 V or +/-4 V input ranges and 12-bit resolution. Its +/-1/2 LSB maximum INL and DNL deliver reliable quantization for pressure, temperature, and flow transmitters feeding a 4-20 mA loop (with a sense resistor). At 40 kS/s with 25 us acquisition-plus-conversion time, it digitizes multiple process signals via an external multiplexer without bottlenecking the controller. The single +5 V supply matches industrial 24V-bus-derived analog rails, and the SOIC-28 package is footprint-compatible with the rest of the TI ADS78xx ADC family, simplifying board respins.
מומלץ
Portable Battery-Powered Instrumentation
The 50 uW maximum power-down current of the ADS7806U/1K makes it a strong fit for handheld multimeters, field data loggers, and portable medical instruments that spend most of their life in standby. The 35 mW active power is low enough to share a linear regulator with the host MCU. A CONVST-triggered single-shot conversion and an SPI-compatible serial output keep the host from tying up GPIO pins. The -40 C to +85 C operating range covers outdoor and cold-chain logistics applications. Designers can leave the ADC in power-down between measurements and wake it on demand for sub-1 mA average battery drain.
מומלץ
Data Acquisition Front Ends for PLCs
In PLC analog input modules the ADS7806U/1K's parallel + SPI dual interface lets the host read conversions either via fast 12-bit bus cycles or low-pin-count serial. The 72 dB minimum SINAD at 1 kHz ensures that 12-bit codes are trustworthy across the audio-band industrial noise spectrum, while the single +5 V supply simplifies the PLC's isolated analog rail. Combined with an external MUX and front-end protection network, a single ADS7806U/1K serves 4 to 8 channels at the 40 kS/s aggregate throughput. The SOIC-28 package is well-suited to the ruggedized through-hole and surface-mount assembly lines typical of industrial automation.
מומלץ
Sensor Signal Digitization (Temperature, Strain, Pressure)
Bridge-type sensors such as load cells, strain gauges, and pressure transducers benefit from the 12-bit, 40 kS/s sampling rate of the ADS7806U/1K for digitizing amplified transducer outputs. The 0 V to +5 V input range matches single-supply instrumentation amplifier outputs, and the +/-1/2 LSB INL/DNL preserves calibration linearity across the full code range. The SPI-compatible serial output allows galvanic isolation with a digital isolator and just three signal lines, simplifying isolation barrier design for medical or high-voltage transducer applications. Designers pair the ADC with a precision op-amp reference buffer for full 12-bit performance.
מומלץ
Medical and Point-of-Care Diagnostic Devices
Point-of-care diagnostic instruments (glucometers, blood-gas analyzers, handheld ultrasound preamps) use the ADS7806U/1K for its low 50 uW power-down current and parallel+serial interface flexibility. The 40 kS/s sample rate captures transient bio-signals with enough margin for software filtering, while the 12-bit resolution is sufficient for many optical and electrochemical sensor channels. The SOIC-28 package is reflow-solderable on standard medical-grade PCB assemblies. Single +5 V operation simplifies the medical IEC 60601-1 isolation design, and the device's wide -40 C to +85 C operating range supports both cold-chain transport and warm clinical environments.
מומלץ
Automotive Sensor Interfaces (Non-Safety)
For non-safety automotive applications such as body-control modules, HVAC sensor digitizers, and battery-management analog front ends, the ADS7806U/1K's -40 C to +85 C industrial range covers cabin and under-hood-adjacent environments. The 12-bit resolution and 72 dB SINAD are sufficient for thermistor, current-sense, and humidity sensor channels. The single +5 V supply interfaces cleanly with the 12 V automotive bus behind a low-dropout regulator. Designers should note that the ADS7806U/1K is NOT AEC-Q100 qualified; for safety-critical automotive channels, use a TI AEC-Q100 ADC instead, with this part serving only non-safety body and comfort electronics.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS7806U/1K — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADS7806U | ADS7807U | ADS7806PG4 | ADS7805PB | ADS7813UB/1K |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-28 | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same |
| Resolution | 12 bits | 12 bits | 16 bits | 12 bits | 16 bits | 12 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Data Output | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Parallel + SPI serial | Serial (SPI) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Packaging Format | Tape & Reel (1K) | Tube | Tube | Tube (RoHS-green) | Tube | Tape & Reel (1K) |
מבדילים עיקריים
- Dual parallel + SPI serial interface in one ADC (לעומתADS7813UB/1K)
- Lower power-down current for battery applications (לעומתADS7805PB)
- Tape & Reel packaging format aligned with SMT production (לעומתADS7806U (Tube))
הערות תכנון
Decouple the +5 V VDD pin with a 10 uF tantalum or ceramic bulk capacitor in parallel with a 0.1 uF ceramic placed within 5 mm of the supply pin. The ADS7806U/1K's 35 mW active dissipation is small but the SAR architecture draws a transient current spike during the internal DAC settling phase; inadequate decoupling can cause reference droop that translates to bit errors. Place an LC or ferrite-bead pi filter on the analog +5 V rail upstream of the ADC for noise-sensitive 12-bit acquisition.
Route the parallel data bus (DB0-DB11) and the SPI serial signals away from the analog input trace and the reference decoupling capacitor. Digital bus edges of 5-10 ns couple capacitive feedthrough into the sample-and-hold front end and can corrupt the conversion. Use a guard trace tied to AGND between the analog input pin (pin 1) and any digital trace within 5 mm. Keep the reference capacitor (typically 10 uF between +VREF and REF GND) physically close to pins 2 and 3 with the ground return directly back to the AGND pin.
Do not exceed the maximum source impedance of the analog input driver for the 25 us acquisition-plus-conversion window - if the op-amp output impedance plus any input filter resistance exceeds the manufacturer datasheet budget, the input will not fully settle and the conversion result will be biased. For ±5 V or ±4 V bipolar input ranges, the RANGE pin (pin 27) must be configured to the matching mode at power-up; do not leave it floating. The PWRDN pin (pin 28) must be driven low to enter the 50 uW shutdown mode - a floating PWRDN can leave the device in indeterminate state.
מידע על תאימות
RoHS compliant per TI product page. Industrial temperature grade only; not AEC-Q100 qualified for automotive safety-critical applications.