ISL267450AIHZ-T - 12-Bit 1MSPS SAR ADC | SOT-23-8 | Renesas
부품 번호: ISL267450AIHZ-T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 10 | $3.71 | $37.10 |
| 100 | $3.18 | $318.00 |
| 500 | $2.74 | $1,370.00 |
| 1,000 | $2.45 | $2,450.00 |
ISL267450AIHZ-T 개요
A SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm against an internal capacitive DAC to digitize an analog input. SAR ADCs occupy the middle ground between slow, high-accuracy delta-sigma converters and fast, lower-resolution flash converters, making them the workhorse for general-purpose industrial, instrumentation, and process-control sampling where both speed and precision matter in a small footprint.
The ISL267450AIHZ-T features excellent linearity over supply and temperature variations, an integrated low-drift internal reference option, and a simple SPI-compatible serial interface that minimizes GPIO usage on the host microcontroller. Its SOT-23-8 footprint occupies roughly 9 mm² of board area, allowing it to be placed adjacent to the signal source for short, clean analog traces. The wide 2.7 V to 5.25 V supply range lets it accept a 3.3 V or 5 V rail directly, simplifying power-tree design.
Typical applications include multi-channel data-acquisition front ends, sensor-signal digitization for industrial process control, portable instrumentation, and battery-management monitoring subsystems. Its combination of 1 MSPS throughput and 12-bit accuracy makes it a strong fit for sampling current-sense amplifiers, thermocouple-conditioned signals, and strain-gauge bridge outputs.
When designing with this part, keep analog and digital ground returns separated and joined at a single point near the IC, and place the decoupling capacitor within 2 mm of the supply pin. This page synthesizes distributor pricing, drop-in alternatives, and practical guidance not found in the manufacturer datasheet alone.
드롭인 대체품: ISL267450AIHZ-T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ISL267450AIHZ-T (동일 폼 팩터 및 풋프린트) — 차이점: Operating Temperature, Input Type, Number of Input Channels, Architecture, RoHS Status.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ISL267450AIHZ-T7A
✅ 드롭인✓ 재고 있음
$2.4 / 개
데이터시트 보기 →ISL267440IHZ-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL26712IHZ-T
✅ 드롭인✓ 재고 있음
$3.96 / 개
데이터시트 보기 →HI5812JIBZ-T
✅ 드롭인✓ 재고 있음
$3.95 / 개
데이터시트 보기 →HI3-574AJN-5Z
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$18.75 / 개
데이터시트 보기 →ISL267450AIHZ-T 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Sample Rate | 1 MSPS (1000 kSamples/sec) |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| 동작 온도 | -40 C to +85 C (Industrial) |
| 패키지 | SOT-23-8 (8-pin) |
| 인터페이스 | SPI-compatible serial |
| Input Type | Single-ended (per family datasheet) |
| Screening Level | Industrial |
| Terminal Form | Gull Wing |
| Package Code | SOP / LSSOP compatible |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (RoHS COMPLIANT per distributor listing) |
ISL267450AIHZ-T 핀 구성
| 핀 1 | AIN+ / IN+ — Analog input positive (per family datasheet convention) |
| 핀 2 | AIN- / IN- — Analog input negative / ground reference |
| 핀 3 | GND — Ground |
| 핀 4 | REF — Reference voltage input/output |
| 핀 5 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| 핀 6 | SCLK — Serial clock input (SPI) |
| 핀 7 | SDO — Serial data output (SPI) |
| 핀 8 | CS_n — Chip select (active low, SPI) |
일반적인 애플리케이션
ISL267450AIHZ-T 적합 용도: 6 애플리케이션s: Industrial Process-Control Data Acquisition, Portable Instrumentation and Handheld Meters, Sensor Signal Digitization (Strain, Thermocouple, Bridge), Battery Management Subsystems, Motor Control Current Sensing, Medical and Wellness Monitoring Devices.
Industrial Process-Control Data Acquisition
The ISL267450AIHZ-T is well suited to industrial process-control front ends because it delivers 12-bit resolution at 1 MSPS from a 2.7 V to 5.25 V analog supply, sampling sensor signals directly from a 3.3 V or 5 V rail. Placed between a 4-20 mA current-loop conditioner and the host MCU, the SAR ADC provides 4096 codes of dynamic range, enough to resolve sub-0.1% changes in pressure, flow, or temperature transducer outputs. The SOT-23-8 footprint allows the ADC to sit within 5 mm of the analog sensor, keeping trace-induced pickup low. Its -40 C to +85 C industrial screening handles the thermal stress of factory-floor cabinets. Unlike delta-sigma converters, the 1 MSPS SAR throughput captures fast transient events such as valve closures and motor inrush without aliasing.
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Portable Instrumentation and Handheld Meters
Portable digital multimeters and handheld instrumentation benefit from the ISL267450AIHZ-T's small SOT-23-8 footprint and 2.7 V to 5.25 V supply range, which lets the ADC share a Li-ion battery rail without a separate LDO. The 1 MSPS throughput provides instantaneous voltage and current snapshots for waveform capture, while the 12-bit resolution yields 1 mV LSB at a 4.096 V full scale - sufficient for 3.5-digit meter accuracy. The device's low power draw preserves battery life in field-deployed instruments, and the SPI-compatible interface connects directly to low-pin-count MCUs without bus contention. Compared to integrating ADCs, the SAR architecture eliminates input-signal conditioning delays.
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Sensor Signal Digitization (Strain, Thermocouple, Bridge)
Strain-gauge bridges and thermocouple amplifiers benefit from the ISL267450AIHZ-T's 12-bit accuracy and 1 MSPS sampling capability. Positioned downstream of an instrumentation amp with a gain of 100, the ADC digitizes a full-scale bridge output of approximately 50 mV to 4.1 V with 12-bit precision, well within the noise floor of typical load-cell applications. The wide supply range accommodates the 5 V sensor excitation rail and shares it for the ADC reference. For thermocouples with 40 uV/C sensitivity, the 12-bit resolution resolves about 0.1 C per LSB at the amplifier output. The compact SOT-23-8 footprint keeps the analog front-end dense on the PCB.
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Battery Management Subsystems
Battery-pack monitoring and battery-management systems use the ISL267450AIHZ-T to digitize individual cell voltages in multi-series Li-ion stacks. Operating from the 2.7 V to 5.25 V supply range, the ADC can directly sample cell voltages up to 5 V without external dividers, simplifying the analog front end. The 12-bit resolution provides 1.2 mV LSB at full scale, sufficient for coulomb-counting accuracy and State-of-Charge estimation. The 1 MSPS sample rate allows simultaneous sampling of multiple cells through an external multiplexer, avoiding sequencing skew. Its low quiescent draw extends runtime in always-on BMS applications such as e-mobility and stationary storage.
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Motor Control Current Sensing
Closed-loop motor control requires precise current feedback, and the ISL267450AIHZ-T's 12-bit resolution at 1 MSPS suits three-phase BLDC and stepper drives. Placed after a low-side current-sense amplifier with 20 V/V gain, the ADC resolves a 5 A peak phase current to roughly 12 mA LSB at the ADC input. The SPI-compatible serial interface feeds directly into field-oriented-control MCUs such as Renesas RA6T1 without bus contention. Industrial-grade -40 C to +85 C operation tolerates the harsh thermal environment of an integrated motor-drive PCB. Compared with on-chip MCU ADCs, the dedicated SAR achieves tighter DNL and lower aperture jitter.
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Medical and Wellness Monitoring Devices
Medical-grade monitoring devices such as pulse oximeters, blood-pressure cuffs, and body-worn health patches use the ISL267450AIHZ-T for its compact SOT-23-8 footprint and 2.7 V to 5.25 V supply range, which simplifies Li-ion-powered designs. The 12-bit resolution digitizes photoplethysmography (PPG) sensor outputs with adequate fidelity for heart-rate trending, while the 1 MSPS throughput oversamples for noise shaping on every beat. The SPI interface frees up GPIO on resource-constrained health MCUs. Although not AEC-Q100 qualified, the industrial -40 C to +85 C rating handles body-temperature and ambient swings in wearable form factors. Designers should add an external low-dropout regulator for medical safety isolation.
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추천 제품 요약
엔지니어링 참조 데이터: ISL267450AIHZ-T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ISL267450AIHZ-T7A | ISL267440IHZ-T | ISL26712IHZ-T | HI5812JIBZ-T |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOT-23-8 | SOT-23-8 (same) | SOT-23-8 (same) | SOT-23-8 (same) | SOT-23-8 (same) |
| Resolution | 12 bits | 12 bits (same) | 10 bits (-2 LSB) | 12 bits (same) | 12 bits (same) |
| Sample Rate | 1 MSPS | 1 MSPS (same) | 1 MSPS (same) | Per datasheet | Per datasheet |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V (same) | 2.7 V to 5.25 V (same) | Per datasheet | Per datasheet |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C (same) | -40 C to +85 C (same) | Per datasheet | Per datasheet |
| Interface | SPI-compatible | SPI-compatible (same) | SPI-compatible (same) | SPI-compatible | Per datasheet |
| Architecture | SAR | SAR (same) | SAR (same) | SAR | SAR |
주요 차별점
- SOT-23-8 footprint for 12-bit 1 MSPS SAR ADC (vs ISL267440IHZ-T (10-bit))
- Wide 2.7 V to 5.25 V analog supply (vs ISL267450AIHZ-T7A (same silicon))
- Industrial -40 C to +85 C screening standard (vs HI5812JIBZ-T (legacy Intersil 12-bit ADC))
설계 노트
Place the ISL267450AIHZ-T within 5 mm of the analog signal source and keep analog and digital ground returns separate, joining them only at the ADC's GND pin. Use a 0.1 uF X7R ceramic decoupling capacitor within 2 mm of the AVDD pin, plus a 10 uF bulk tantalum or ceramic on the supply rail. Route the SPI clock and data traces over an unbroken ground plane to maintain signal integrity at 1 MSPS.
Avoid routing the SPI bus near switching regulator inductors or digital clock lines; capacitive coupling at 1 MSPS can corrupt the SDO data. Always assert CS_n before applying power, and ensure the SCLK idle state matches the ISL267450A datasheet specification (CPOL/CPHA) to avoid spurious conversions. Failing to power the reference pin through a low-impedance source will degrade INL and DNL.
At full 1 MSPS throughput and 5 V supply, the ISL267450AIHZ-T dissipates only a few milliwatts; the SOT-23-8 thermal resistance (theta_JA approximately 200 C/W on a 1-oz JEDEC 4-layer board) is non-limiting in practice. Estimated: junction temperature rise at 30 C ambient is well below 10 C. Still, ensure copper-pour area beneath the exposed lead frame pad to improve thermal spreading in enclosed housings.
규정 준수 정보
RoHS COMPLIANT per distributor listing (digchip.org specification sheet). Lead-free confirmed via Renesas/Intersil product family. AEC-Q100 not qualified; this part is targeted at industrial rather than automotive safety-critical applications. REACH and halogen-free status to be confirmed from the manufacturer declaration.
