ADS1286PAG4 - 12-bit 20kHz Micro Power SAR ADC | Texas Instruments
부품 번호: ADS1286PAG4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.65 | $36.50 |
| 100 | $2.95 | $295.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.2 | $2,200.00 |
ADS1286PAG4 개요
An SAR (Successive Approximation Register) ADC is a type of Nyquist-rate data converter that uses a binary-weighted capacitor array and a comparator to converge on the analog input voltage in N clock cycles, where N is the resolution in bits. SAR ADCs occupy the middle ground between slow high-precision delta-sigma converters and flash ADCs; they deliver low latency (one conversion per cycle), deterministic throughput suitable for multiplexed acquisition, and modest power draw. The ADS1286PAG4 belongs to the broader hierarchy: ADC -> data converter -> data acquisition IC -> signal chain -> mixed-signal semiconductor.
Key features include a guaranteed-no-missing-codes 12-bit transfer function, a 20 kHz maximum sampling rate, a 60 µs typical conversion time, only 250 µA of supply current during continuous conversion, and a low 0.0488 % linearity error (1 LSB). The differential input stage rejects common-mode noise on long analog runs, and the synchronous serial output minimizes MCU pin count. Operating temperature spans -40 °C to +85 °C, qualifying it for industrial-grade chassis-mount and remote-instrumentation designs.
Architecturally, the ADS1286PAG4 combines a precision CMOS capacitor-DAC successive-approximation core with an on-chip clock and reference input path. Designers feed the reference from a stable 5 V rail (or an external low-drift reference) and digitize true-differential or single-ended bipolar signals up to ±VREF. The serial data frame is MSB-first, allowing direct hand-off to microcontrollers, FPGAs, or DSPs without glue logic.
Typical applications include portable instrumentation, remote battery-powered data loggers, industrial process-control analog front ends, hand-held multimeters, and transducer/sensor signal conditioning where low power and small PCB area are required. Choose the ADS1286PAG4 when you need 12-bit precision at moderate speed from a single 5 V rail with deterministic conversion latency.
Design tip: place the 0.1 µF supply bypass capacitor within 5 mm of the VDD pin and route the differential analog traces as a tightly-coupled pair to maximize common-mode rejection. The ADS1286PAG4 is pin-compatible with several 8-pin PDIP ADC descendants from the same TI family, simplifying PCB reuse across product variants.
드롭인 대체품: ADS1286PAG4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS1286PB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS1286P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS1286PAG4 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| 샘플링 속도 | 20 kHz |
| Conversion Time | 60 µs (typical) |
| Number of Input Channels | 1 differential |
| ADC Architecture | SAR (Successive Approximation) |
| 공급 전압 | 5 V |
| 공급 전류 | 250 µA |
| Input Type | Differential |
| Data Interface | Serial, SPI / SSI compatible (2-wire or 3-wire) |
| Linearity Error (INL) | 0.0488 % (±1 LSB) |
| Missing Codes | Guaranteed no missing codes |
| 동작 온도 | -40 °C to +85 °C |
| 패키지 | 8-PDIP (0.300 in, 7.62 mm body width) |
| Packaging | Tube |
| 실장 유형 | Through-Hole |
| RoHS 상태 | Compliant |
ADS1286PAG4 핀 구성
| 핀 1 | IN+ — Non-inverting analog input (differential) |
| 핀 2 | IN- — Inverting analog input (differential) |
| 핀 3 | GND — Analog ground |
| 핀 4 | REF — Reference voltage input |
| 핀 5 | CS_bar — Chip select (active low) |
| 핀 6 | D_OUT — Serial data output |
| 핀 7 | D_IN/SCLK — Serial clock / data input |
| 핀 8 | VDD — Analog +5 V supply |
일반적인 애플리케이션
ADS1286PAG4 적합 용도: 6 애플리케이션s: Portable Handheld Digital Multimeter, Battery-Powered Remote Data Logger, Industrial Process Control Analog Front End, Medical Patient Monitoring Sensor Interface, Automotive Cabin Sensor Signal Conditioning, Test and Measurement Instrumentation Front End.
Portable Handheld Digital Multimeter
The ADS1286PAG4's 12-bit resolution, 60 µs deterministic conversion latency, and 250 µA supply current fit handheld multimeter (DMM) analog front ends where a single 5 V coin-cell or Li-ion rail powers the entire instrument. Its differential input rejects common-mode pickup on the long test-lead cables that technicians use in the field, while the SPI/SSI serial interface connects directly to a low-pin-count MSP430 or Cortex-M0 MCU. The 20 kHz sample rate is more than enough for DC and low-frequency AC voltage, current, and resistance measurements and provides headroom for averaging to improve effective resolution to 13-14 bits noise-free. Compared with a 16-bit delta-sigma ADC, the SAR architecture delivers immediate conversion results without digital filter settling delays, which keeps the DMM's auto-range response snappy.
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Battery-Powered Remote Data Logger
The 250 µA ADS1286PAG4 supply current translates to roughly 1.25 mW dissipation from a 5 V rail, ideal for solar- or battery-powered remote data loggers that sample once per minute to once per hour. A 6 Ah LiSOCl2 primary cell can power an ADS1286PAG4 plus a low-power MSP430 for years. Its 8-pin PDIP through-hole footprint also tolerates hand-soldering during field retrofits and ruggedizes against vibration versus smaller SMD parts. The differential input accommodates bridge-type pressure, strain, or flow sensors commonly used in environmental monitoring stations, while the deterministic conversion eliminates the digital-filter warm-up that delta-sigma ADCs require.
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Industrial Process Control Analog Front End
In industrial PLC analog input modules, the ADS1286PAG4 provides ±5 V or 0-10 V signal conditioning with its differential input and 12-bit resolution adequate for thermocouple, RTD, and 4-20 mA loop digitization. Its -40 °C to +85 °C operating range covers factory-floor enclosures and outdoor control cabinets, while the SPI bus lets a host PLC microcontroller poll multiple ADS1286PAG4 channels in a time-multiplexed fashion. The 20 kHz sample rate supports the typical 100 Hz-1 kHz control loops used in process automation and leaves margin for digital filtering to suppress 50/60 Hz mains interference via simple averaging.
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Medical Patient Monitoring Sensor Interface
Medical bedside monitors for SpO2, temperature, and respiration use a low-power, deterministic ADC at the patient-coupled analog front end. The ADS1286PAG4 fits compact peripheral boards where its 12-bit resolution digitizes temperature and respiration waveforms sampled at hundreds of Hz, while the 250 µA supply draw extends battery runtime on portable units. The differential input rejects 50/60 Hz mains pickup that injects noise into long patient cables, and the SPI bus cleanly hands off to a host microcontroller or low-power wireless SoC for transmission to the central monitor. The PDIP package supports hospital-grade sterilization-friendly conformal coatings that older ceramic or metal packages handle poorly.
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Automotive Cabin Sensor Signal Conditioning
Although not AEC-Q100 qualified itself, the ADS1286PAG4 can be used in non-safety automotive cabin applications such as HVAC temperature mix-door position sensing, headlight level sensors, and battery-state analog front ends. Its 12-bit resolution and 20 kHz sample rate cover the slow-changing analog signals from potentiometric and Hall-effect position sensors. The differential input rejects ground-shift noise common in automotive wiring harnesses where chassis return varies. Designers favor the 8-PDIP through-hole variant for prototype harnesses and pre-production modules where hand rework and easy test-point access accelerate bring-up.
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Test and Measurement Instrumentation Front End
Benchtop DMMs, signal analyzers, and educational lab instruments all benefit from the ADS1286PAG4's 12-bit resolution and low-noise SAR architecture. The deterministic conversion latency lets the instrument show real-time waveforms without the digital-filter group delay of a delta-sigma ADC, which is important for transient capture. The 250 µA supply current supports battery-powered field service versions of the instrument, and the SPI bus interfaces cleanly to FPGA-based signal processing engines used in higher-end analyzers. Differential inputs accept ±5 V bipolar signals found in industrial transducer outputs, simplifying the analog front-end design.
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추천 제품 요약
엔지니어링 참조 데이터: ADS1286PAG4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS1286PB | ADS1286P |
|---|---|---|---|
| Package | 8-PDIP | 8-PDIP - same | 8-PDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 20 kHz | 20 kHz | 20 kHz |
| Supply Current | 250 µA | 250 µA | 250 µA |
| Supply Voltage | 5 V | 5 V | 5 V |
| Interface | SPI/SSI | SPI/SSI | SPI/SSI |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Pb-Free / RoHS | Yes (Pb-free) | Yes (Pb-free) | No (lead-bearing) |
| Pinout Compatibility | Reference | 100% pin-compatible drop-in | 100% pin-compatible drop-in |
주요 차별점
- Pb-free / RoHS-compliant tube-packaged variant (vs ADS1286PB)
- Specified for industrial -40 °C to +85 °C operation (vs ADS1286P (non-G4))
- Micropower 250 µA supply current at full 20 kHz (vs Cross-brand 12-bit SAR ADCs)
설계 노트
Place a 0.1 µF ceramic bypass capacitor within 5 mm of the VDD pin and connect the ground lead directly to the analog ground plane. Use a separate analog and digital ground tied at a single point near the ADC's GND pin to prevent digital return currents from corrupting the analog input reference.
Route the differential IN+ and IN- traces as a tightly coupled pair of equal length, ideally over a continuous ground plane, to maximize common-mode rejection. Keep the analog traces away from the serial clock and data lines, and surround sensitive analog nodes with a guard ring tied to analog ground to absorb stray leakage currents.
Do not exceed the 5 V absolute maximum on VDD or apply a reference voltage above VDD; reversed reference polarity can damage the input ESD structure. When operating near full scale, ensure the input source can drive the sample-and-hold capacitor settling time (60 µs) and add an input buffer if source impedance exceeds 1 kΩ to avoid gain error.
Average supply current scales linearly with sample rate because the SAR core powers down between conversions. At 1 kSPS the ADS1286PAG4 draws well under 50 µA average, making it suitable for duty-cycled battery operation. Decouple CS_bar transitions cleanly to avoid spurious SCLK noise coupling into the analog input.
규정 준수 정보
G4 suffix on TI parts denotes Pb-free / RoHS-compliant tube packaging per TI's datasheet ordering information; the base ADS1286 datasheet covers environmental ratings. AEC-Q100 qualification is not available for the ADS1286 family - choose a Q1 part from TI for automotive safety applications.
