ISL267450AIHZ-T7A - 12-bit 1MSPS SAR ADC | Renesas | SOT-23-8
부품 번호: ISL267450AIHZ-T7A ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.95 | $4.95 |
| 10 | $4.21 | $42.10 |
| 100 | $3.32 | $332.00 |
| 500 | $2.85 | $1,425.00 |
| 1,000 | $2.4 | $2,400.00 |
ISL267450AIHZ-T7A 개요
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a sampling ADC architecture that performs one conversion by comparing the sampled input against a binary-weighted reference ladder, bit-by-bit, in N clock cycles for N bits of resolution. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They offer deterministic low-latency conversion (no pipeline delay), excellent DC linearity, and are well-suited for multiplexed data-acquisition, instrumentation, and process-control front-ends where both DC accuracy and clean dynamic performance are required.
Key features of the ISL267450AIHZ-T7A include 12-bit no-missing-codes performance, an integrated input track-and-hold, a high-speed SPI-/QSPI-/MICROWIRE-compatible serial interface, and excellent linearity over supply and temperature variations. The pinout is drop-in compatible with the ISL267440 (10-bit version), enabling system-level resolution scaling without PCB rework. The device accepts an external reference up to VDD, allowing designers to optimize dynamic range against the input signal amplitude.
The ISL267450AIHZ uses a charge-redistribution SAR core with an auto-zeroing input front end to minimize offset and drift. It includes a serial data-output clock edge that simplifies isolated-barrier or opto-coupled data-acquisition front ends. The single 5V supply rail simplifies system power, while the small SOT-23-8 footprint suits compact, dense PCB layouts where conventional QFN or SOIC ADC packages are too large.
Typical applications include industrial process-control analog input modules, multi-channel data-acquisition systems, portable battery-powered instrumentation, optical-sensor front ends, and precision sensor-signal digitization. Its wide operating range and small package also fit medical-monitoring accessory boards and energy-monitoring (energy-harvesting metering) designs.
A key design consideration is reference decoupling: place a low-ESR 10 uF tantalum or ceramic bypass directly on the REF pin with a 0.1 uF ceramic in parallel to preserve linearity at 1 MSPS. Route the digital outputs away from the analog input traces to minimize digital-coupling noise; even though the SOT-23 package keeps the part compact, the input signal integrity and reference stability dictate achievable SNR.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the bare manufacturer datasheet, giving engineers a single source for comparing 12-bit, 1 MSPS SAR ADCs from Renesas, Texas Instruments, and Analog Devices in the SOT-23-8 footprint.
드롭인 대체품: ISL267450AIHZ-T7A — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ISL267450AIHZ-T7A (동일 폼 팩터 및 풋프린트) — 차이점: Input Type, Number of Input Channels, RoHS Status, Operating Temperature, Digital Interface.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ISL267440AIHZ-T7A
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL267450AIHZ-T
✅ 드롭인✓ 재고 있음
$2.45 / 개
데이터시트 보기 →ISL267440AIHZ-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ISL26712IHZ-T
✅ 드롭인✓ 재고 있음
$3.96 / 개
데이터시트 보기 →ISL267450AIHZ-T7A 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Sample Rate | 1 MSPS |
| Number of Input Channels | 1 (single-ended / pseudo-differential) |
| Converter Architecture | SAR (Successive Approximation) |
| Supply Voltage (VDD) | 4.75 V to 5.25 V (single 5 V supply) |
| Reference Voltage (VREF) | 2.5 V (external, supports up to VDD) |
| 동작 온도 | -40 C to +85 C (Industrial) |
| Package Type | SOT-23-8 (8-pin) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| RoHS 상태 | RoHS Compliant |
| Input Type | Pseudo-differential (single-ended input to VREF common mode) |
| Pin/Package Marking | IHZ |
ISL267450AIHZ-T7A 핀 구성
| 핀 1 | VDD — Analog +5V supply |
| 핀 2 | GND — Ground |
| 핀 3 | REF — External 2.5V reference input |
| 핀 4 | SCLK — Serial clock input |
| 핀 5 | SDATA — Serial data output |
| 핀 6 | CS — Chip select (active low) |
| 핀 7 | VIN — Analog input |
| 핀 8 | SHDN — Shutdown control (active high) |
일반적인 애플리케이션
ISL267450AIHZ-T7A 적합 용도: 6 애플리케이션s: Industrial Process-Control Analog Input Modules, Multi-Channel Data-Acquisition Systems (DAQ), Portable Battery-Powered Instrumentation, Optical-Sensor Front Ends (Photodiode Digitizer), Energy-Monitoring / Smart Metering Front Ends, Precision Sensor-Signal Digitization.
Industrial Process-Control Analog Input Modules
The ISL267450AIHZ-T7A fits 4-20 mA current-loop and 0-10V transducer digitizer front ends in PLC analog input cards because of its 12-bit resolution and 1 MSPS sample rate, sufficient for multiplexing multiple channels per second. The integrated track-and-hold and single +5V supply simplify the signal-chain design: connect the transducer through a protection resistor and RC filter directly to the VIN pin. Compared with a discrete op-amp + external ADC design, the SOT-23-8 package integrates the entire conversion chain, saving approximately 30-50% PCB area and BOM cost.
추천
Multi-Channel Data-Acquisition Systems (DAQ)
Use the ISL267450AIHZ-T7A at the heart of a multi-channel DAQ where an analog multiplexer (e.g., 8:1 MUX) feeds a single ADC through the SOT-23-8 compact input stage. The 1 MSPS throughput supports aggregate continuous sampling of up to ~50 kHz per channel across 16 multiplexed channels, and the 12-bit resolution with no-missing-codes performance gives a usable ENOB of ~10 bits at full speed. Digital-CMOS serial interface connects directly to a host MCU/DSP without level translation, and the industrial -40C to +85C range supports lab and field deployment.
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Portable Battery-Powered Instrumentation
In handheld battery-powered instruments (multimeters, vibration analyzers, field environmental sensors), the ISL267450AIHZ-T7A's SOT-23-8 tiny footprint and SHDN pin enable sub-1 mW sleep current when not converting, extending battery life by 30-70% versus always-on designs. Use it to digitize thermocouple, strain-gauge, or MEMS microphone front ends where 12-bit resolution is acceptable and 1 MSPS burst sampling supports transient analysis. Although single +5V analog supply is required, an integrated boost converter (e.g., ISL97519 or similar) produces 5V from a 3.7V Li-ion cell, keeping total solution size compact.
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Optical-Sensor Front Ends (Photodiode Digitizer)
For photodiode or PIN-diode signal conditioning (smoke detectors, pulse oximeters, optical encoders), the ISL267450AIHZ-T7A pairs with a transimpedance amplifier (TIA) to convert nanoamp-level photocurrents into digital codes with 12-bit (4096-level) resolution. The 1 MSPS throughput supports 1 MHz pulse oximetry or high-speed optical-encoder pulse profiling with excellent dynamic range. The single +5V supply and SOT-23-8 footprint enable miniaturization for medical peripheral or IoT form factors; pair the reference pin with a precision 2.5V source (TL431ACDBZR) for stability over temperature.
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Energy-Monitoring / Smart Metering Front Ends
In single-phase energy meters and load-monitoring embedded modules, the ISL267450AIHZ-T7A digitizes current-sense amplifier outputs and voltage-divider tap signals at 1 MSPS, enabling harmonic analysis up to ~500 kHz post-decimation. The 12-bit resolution delivers ~70 dB dynamic range sufficient for Class 1 metering accuracy in single-phase residential installations. Use the SHDN pin for low-power sleep states between conversions, extending battery life on outage-tolerant meters. The SOT-23-8 package fits easily into the 24 mm x 18 mm PCB typical of smart meter control boards.
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Precision Sensor-Signal Digitization
Use the ISL267450AIHZ-T7A in laboratory and industrial-grade sensor signal conditioning modules for strain-gauge bridges, RTD-derived temperature signals, and load-cell amplification digitization. The pseudo-differential input front-end and external reference allows ratiometric bridge excitation directly from the 2.5V REF pin, cancelling bridge excitation drift and achieving full-scale accuracy within 2-3 LSB. The 1 MSPS through-bit SAR conversion ensures no latency during triggered single-shot samples, ideal for peak-detect or transient-capture modes in pressure and force measurement.
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추천 제품 요약
엔지니어링 참조 데이터: ISL267450AIHZ-T7A — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ISL267440AIHZ-T7A | ISL267450AIHZ-T | ISL267440AIHZ-T | ISL26712IHZ-T |
|---|---|---|---|---|---|
| Package | SOT-23-8 | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Resolution | 12 bits | 10 bits | 12 bits | 10 bits | 12 bits |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | lower |
| Input Channels | 1 (pseudo-differential) | 1 (pseudo-differential) | 1 (pseudo-differential) | 1 (pseudo-differential) | 1 (pseudo-differential) |
| Supply Voltage | +4.75V to +5.25V | +4.75V to +5.25V | +4.75V to +5.25V | +4.75V to +5.25V | +4.75V to +5.25V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Reel Format | T7A (250 pcs/7-inch) | T7A (250 pcs/7-inch) | T (standard 2500 pcs) | T (standard 2500 pcs) | T (standard reel) |
| Approximate 1k price | $2.40 | $2.00 | $2.10 | $1.75 | $2.20 |
주요 차별점
- Only SOT-23-8 12-bit 1 MSPS SAR ADC in the ISL2674xx family with industrial-temperature qualification (vs ISL267440AIHZ-T7A)
- Compact 8-pin SOT-23-8 package vs larger 10-pin MSOP and 8-pin SOIC alternatives (vs ADS7883 (TI))
- Single +5V analog supply simplifies power architecture (vs AD7476A (ADI))
설계 노트
Estimated: at +5V analog supply and 1 MSPS continuous conversion, the ISL267450AIHZ-T7A draws ~3-5 mA (15-25 mW). Use a 10 uF tantalum or low-ESR ceramic bypass directly on VDD (pin 1) with a parallel 0.1 uF ceramic to minimize digital-induced supply noise that couples into the analog input. In SHDN mode, total supply current drops below 1 uA, enabling micropower sleep states for battery-powered instrumentation. Decouple the reference pin (REF, pin 3) with a 10 uF tantalum in parallel with a 0.1 uF ceramic to preserve linearity at full 1 MSPS throughput; reference stability directly limits achievable SNR.
Estimated: layout-driven signal coupling can dominate performance at 1 MSPS throughput. Keep the analog input trace (VIN, pin 7) shorter than 10 mm and shielded with ground pour on both sides to minimize digital noise coupling from SDATA/SCLK traces. Place VDD decoupling within 2-5 mm of pin 1 and REF decoupling within 2-5 mm of pin 3. Use a single continuous ground plane beneath the IC to avoid ground-loop currents between analog return and digital return. The exposed copper pad beneath the SOT-23-8 should not be used as a thermal pad - the SOT-23-8 is a non-thermal-pad package; keep all eight pins on the top layer for accessible probing.
Estimated: three common engineering pitfalls with the ISL267450AIHZ-T7A: (1) Do not exceed VDD on the digital outputs (SDATA, SCLK, CS) when interfacing directly to a 3.3V MCU - use a logic-level translator or isolator; (2) Do not allow VIN to exceed VDD+0.3V or go below -0.3V, as the analog input ESD structure has limited over-voltage tolerance and will degrade if the analog signal outranges the supply without protection resistors; (3) Do not omit the SHDN pin pull-down - leaving SHDN floating can result in unpredictable shutdown states and intermittent ADC output codes during power-up.
규정 준수 정보
RoHS compliant per Renesas/Intersil datasheet. Industrial-temperature qualified (-40C to +85C). Not AEC-Q100 qualified for automotive - use -Q1 suffix variant for AEC-Q100 grade.
