ADS1286U/2K5G4 - 12-Bit 20kHz Micropower SAR ADC | TI
부품 번호: ADS1286U/2K5G4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 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 개요
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.
드롭인 대체품: ADS1286U/2K5G4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADS1286U/2K5G4 (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Missing Codes, Package, Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS1286U/2K5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1286UAG4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1286UL/2K5G4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1286U
✅ 드롭인✓ 재고 있음
$3.96 / 개
데이터시트 보기 →ADS7823E/2K5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1286U/2K5G4 최대 정격 & 전기적 특성
| 분해능 | 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 |
| 동작 온도 범위 | -40 C to +85 C |
| 패키지 | 8-SOIC (0.154", 3.90 mm width) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
ADS1286U/2K5G4 핀 구성
| 핀 1 | VDD — Positive analog/digital supply (5 V nominal) |
| 핀 2 | IN+ — Non-inverting analog input (sample-and-hold positive) |
| 핀 3 | IN- — Inverting analog input (sample-and-hold negative) |
| 핀 4 | GND — Ground |
| 핀 5 | /CS — Chip select, active low, enables serial interface |
| 핀 6 | DOUT — Serial data output, conversion result, MSB first |
| 핀 7 | SCLK — Serial clock, clocks conversion result out |
| 핀 8 | GND — Ground / digital return |
일반적인 애플리케이션
ADS1286U/2K5G4 적합 용도: 6 애플리케이션s: 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.
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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.
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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.
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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.
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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.
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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.
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추천 제품 요약
엔지니어링 참조 데이터: ADS1286U/2K5G4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Industry-leading 250 uA micropower supply current at 12-bit/20 kSPS (vs ADS7823E/2K5)
- Pin-compatible wide SOIC body for hand-soldering and rework (vs ADS7823E/2K5)
- Full same-package drop-in compatibility with the ADS1286 family (vs ADS1286PG4 / ADS1286PK (8-PDIP))
설계 노트
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.
규정 준수 정보
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.