ISL267450AIHZ-T - 12-Bit 1MSPS SAR ADC | SOT-23-8 | Renesas
MPN: ISL267450AIHZ-T ✓ Hoạt độngISL267450AIHZ-T Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ISL267450AIHZ-T — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ISL267450AIHZ-T (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Input Type, Number of Input Channels, Architecture, RoHS Status.
ISL267450AIHZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL267440IHZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26712IHZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →HI5812JIBZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →HI3-574AJN-5Z
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ISL267450AIHZ-T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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 |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | SOT-23-8 (8-pin) |
| Giao diện | SPI-compatible serial |
| Input Type | Single-ended (per family datasheet) |
| Screening Level | Industrial |
| Terminal Form | Gull Wing |
| Package Code | SOP / LSSOP compatible |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (RoHS COMPLIANT per distributor listing) |
Cấu hình chân ISL267450AIHZ-T
| Chân 1 | AIN+ / IN+ — Analog input positive (per family datasheet convention) |
| Chân 2 | AIN- / IN- — Analog input negative / ground reference |
| Chân 3 | GND — Ground |
| Chân 4 | REF — Reference voltage input/output |
| Chân 5 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Chân 6 | SCLK — Serial clock input (SPI) |
| Chân 7 | SDO — Serial data output (SPI) |
| Chân 8 | CS_n — Chip select (active low, SPI) |
Ứng dụng tiêu biểu
ISL267450AIHZ-T phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL267450AIHZ-T — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- SOT-23-8 footprint for 12-bit 1 MSPS SAR ADC (vsISL267440IHZ-T (10-bit))
- Wide 2.7 V to 5.25 V analog supply (vsISL267450AIHZ-T7A (same silicon))
- Industrial -40 C to +85 C screening standard (vsHI5812JIBZ-T (legacy Intersil 12-bit ADC))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
