ADS1286U/2K5G4 - 12-Bit 20kHz Micropower SAR ADC | TI
Артикул: ADS1286U/2K5G4 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $3.8 | $3,80 |
| 10 | $3.42 | $34,20 |
| 100 | $3.04 | $304,00 |
| 500 | $2.74 | $1.370,00 |
| 1.000 | $2.43 | $2.430,00 |
ADS1286U/2K5G4 Обзор
A successive-approximation ADC (often abbreviated SAR ADC) is a type of data-conversion IC that walks an internal capacitive DAC from MSB to LSB each conversion cycle, producing a low-latency, deterministic sample output with no pipeline delay. SAR ADCs are widely used when a system needs a clean single-shot sample with simple control, low standby current, and modest resolution - they sit between slower sigma-delta ADCs (which trade latency for higher resolution) and flash ADCs (which trade power for speed). Within a system, the SAR ADC is positioned just after analog signal conditioning and ahead of a digital controller that consumes the conversion result.
Key features include guaranteed no missing codes at 12 bits, 20 kHz maximum sampling rate, 250 µA typical supply current, an SPI/SSI-compatible serial interface, a single 5 V supply, and an industrial -40 °C to +85 °C operating temperature range. The 8-SOIC footprint and two-wire serial interface simplify board layout and reduce MCU pin overhead in space-constrained designs.
The architecture combines an input sample-and-hold with a charge-redistribution SAR core and a precision internal reference path, giving deterministic latency of one conversion cycle and the absence of pipeline or integration delay. Because the digital interface is a simple shift-register readout, the part is straightforward to drive from virtually any microcontroller with an SPI peripheral.
Typical applications include remote sensor data acquisition, isolated analog front ends, battery-powered instrumentation, industrial process-control transducers, and portable medical accessory boards. The DIP and SOIC footprints also support hand-soldered prototype or through-hole-style retrofit boards. When designing the analog front end, take care to bypass VDD with a 0.1 µF ceramic close to the pin and to keep the analog input traces short and guarded, since the 12-bit, 20 kSPS converter will expose any added noise or reference drift directly in the conversion result. This page consolidates distributor pricing, pin-compatible drop-in alternatives, and practical design guidance not found in the standalone manufacturer datasheet.
Аналоги без доработки для ADS1286U/2K5G4 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ADS1286U/2K5G4 (тот же форм-фактор и посадочное место) — отличается по Architecture, Missing Codes, Package, Resolution.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ADS1286U/2K5
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADS1286UAG4
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADS1286UL/2K5G4
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADS1286U
✅ Прямая замена✓ В наличии
$3.96 / шт.
Открыть даташит →ADS7823E/2K5
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADS1286U/2K5G4 Максимальные параметры и электрические характеристики
| Разрешение | 12 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Inputs | 1 (single-ended or differential) |
| Sample Rate (max) | 20 kSPS |
| Analog Input Range | 0 V to 5.3 V |
| Supply Voltage (nominal) | 5 V |
| Supply Current (typ) | 250 uA |
| Data Interface | SPI / SSI compatible, 2- or 3-wire serial |
| Missing Codes | Guaranteed no missing codes |
| Input Type | Differential with sample-and-hold |
| Диапазон рабочих температур | -40 C to +85 C |
| Корпус | 8-SOIC (0.154", 3.90 mm width) |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
Конфигурация выводов ADS1286U/2K5G4
| Контакт 1 | VDD — Positive analog/digital supply (5 V nominal) |
| Контакт 2 | IN+ — Non-inverting analog input (sample-and-hold positive) |
| Контакт 3 | IN- — Inverting analog input (sample-and-hold negative) |
| Контакт 4 | GND — Ground |
| Контакт 5 | /CS — Chip select, active low, enables serial interface |
| Контакт 6 | DOUT — Serial data output, conversion result, MSB first |
| Контакт 7 | SCLK — Serial clock, clocks conversion result out |
| Контакт 8 | GND — Ground / digital return |
Типичное применение
ADS1286U/2K5G4 подходит для 6 применениеs: Remote Sensor Data Acquisition, Isolated Analog Front Ends, Battery-Powered Instrumentation, Industrial Process-Control Transducers, Portable Medical Accessory Boards, Hand-Soldered Prototype / Retrofit Boards.
Remote Sensor Data Acquisition
The ADS1286U/2K5G4 fits remote sensor data acquisition because its 250 uA typical supply current and 5 V single-supply operation let it run from battery or 4-20 mA loop power for years, while the 12-bit, 20 kSPS throughput digitizes thermistor, RTD, and strain-gauge bridges at full bandwidth. According to the TI datasheet, the differential input and integrated sample-and-hold reject common-mode noise on long sensor cables, and the 2-wire SPI/SSI interface reduces the opto-isolator channel count in isolated front ends to just data + clock.
Рекомендуется
Isolated Analog Front Ends
In isolated analog front ends, the ADS1286U/2K5G4 minimizes the isolation barrier cost because its SPI/SSI-compatible 2-wire interface only needs an opto-isolator pair plus a third wire for /CS, instead of the four or five isolators required by parallel-output ADCs. The TI datasheet confirms 12-bit, 20 kSPS operation at 250 uA typical from a 5 V supply on the field side, and its industrial -40 C to +85 C range covers factory-floor and process-control environments. Place 0.1 uF ceramic bypass on VDD and a ferrite on the analog input to keep iso-side transients out of the conversion.
Рекомендуется
Battery-Powered Instrumentation
Battery-powered instrumentation benefits from the ADS1286U/2K5G4 because the 250 uA typical supply current extends coin-cell and 9 V battery life into multi-year service, while the 20 kSPS max sample rate covers instrumentation audio and slow transducer transients. The TI datasheet specifies a single 5 V supply with no charge pump, so a small LDO with the part works as a complete power-and-conversion node, and the SOIC-8 form factor keeps the PCB area small inside hand-held enclosures.
Рекомендуется
Industrial Process-Control Transducers
Industrial process-control transducers use the ADS1286U/2K5G4 for 4-20 mA loop-powered pressure, flow, and level sensors where the 250 uA current draw keeps total loop budget low. According to the TI datasheet, the differential input handles bridge-style sensor outputs directly, and the -40 C to +85 C industrial temperature range with guaranteed no missing codes gives the linearity headroom required for closed-loop control. Add an op-amp buffer on the analog input if the source impedance is above the datasheet's recommended maximum.
Рекомендуется
Portable Medical Accessory Boards
Portable medical accessory boards - handheld pulse-oximeter cap boards, single-channel ECG front ends, and bedside sensor pods - fit the ADS1286U/2K5G4 because of its 12-bit/20 kSPS throughput and 250 uA micropower operation from a single 5 V rail. The TI datasheet confirms the SPI/SSI two-wire interface lets a low-cost MCU sample and stream over USB or Bluetooth, while the SOIC-8 footprint leaves room for analog guards on small multilayer boards in FDA-trackable low-leakage designs.
Рекомендуется
Hand-Soldered Prototype / Retrofit Boards
The ADS1286 family is available in 8-SOIC and 8-PDIP, making the SOIC-8 ADS1286U/2K5G4 ideal for hand-soldered prototype or retrofit boards in university labs, repair shops, and small-batch refurbish lines. Per the TI datasheet, the 12-bit, 20 kSPS, 5 V single-supply ADC has a forgiving 0-5.3 V analog input range, and the SOIC land pattern is easy to hand-rework with a fine-tip iron and 0.5 mm solder braid for repair technicians.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ADS1286U/2K5G4 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ADS1286U/2K5 | ADS1286UAG4 | ADS1286UL/2K5G4 | ADS7823E/2K5 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (0.154", 3.90 mm) | 8-SOIC (0.154") - same | 8-SOIC (0.154") - same | 8-SOIC (0.154") - same | 8-VSSOP - smaller footprint, same pin count |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Serial Interface | SPI/SSI (2- or 3-wire) | SPI/SSI (2- or 3-wire) | SPI/SSI (2- or 3-wire) | SPI/SSI (2- or 3-wire) | SPI/SSI |
Ключевые отличия
- Industry-leading 250 uA micropower supply current at 12-bit/20 kSPS (против ADS7823E/2K5)
- Pin-compatible wide SOIC body for hand-soldering and rework (против ADS7823E/2K5)
- Full same-package drop-in compatibility with the ADS1286 family (против ADS1286PG4 / ADS1286PK (8-PDIP))
Заметки по проектированию
Estimated: at 5 V supply and 250 uA typical supply current from the TI datasheet, the steady-state power budget is roughly 1.25 mW. For battery-powered designs, an LDO with <100 uA quiescent current (e.g. one of TI's low-Iq families) is recommended so the regulator does not dominate the sleep-mode current. Place a 0.1 uF ceramic bypass close to VDD and a bulk 1-10 uF at the board input.
Keep analog input traces short and guarded on the SOIC side, with a ground ring or via fence around IN+ and IN-. Place the 0.1 uF VDD bypass within 3 mm of pin 1 (VDD) and run separate analog/digital ground returns back to a single-star point. According to the TI ADS1286 datasheet layout guidance, do not route the SCLK trace beneath or alongside the analog input traces or noise will couple into the sample-and-hold.
Do not drive /CS low before the supply has stabilized - the datasheet's no-missing-codes guarantee assumes power-up with /CS high. Drive /CS inactive between conversions when running continuous sampling to avoid bus contention. Also ensure the host's SCLK frequency is within the part's maximum serial-clock rating per the TI datasheet timing table - exceeding it can corrupt the conversion result on SOIC builds.
Информация о соответствии
RoHS and lead-free per TI product data in verified web data; AEC-Q100 not applicable to non-automotive ADC; please confirm latest halogen-free and REACH attestation on the TI product page before placing volume orders.