ISL267450AIHZ-T7A - 12-bit 1MSPS SAR ADC | Renesas | SOT-23-8
MPN: ISL267450AIHZ-T7A ✓ Hoạt độngISL267450AIHZ-T7A Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ISL267450AIHZ-T7A — 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-T7A (cùng hình factor và footprint) — khác nhau ở Input Type, Number of Input Channels, RoHS Status, Operating Temperature, Digital Interface.
ISL267440AIHZ-T7A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL267450AIHZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL267440AIHZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26712IHZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL267450AIHZ-T7A Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Package Type | SOT-23-8 (8-pin) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Trạng thái RoHS | RoHS Compliant |
| Input Type | Pseudo-differential (single-ended input to VREF common mode) |
| Pin/Package Marking | IHZ |
Cấu hình chân ISL267450AIHZ-T7A
| Chân 1 | VDD — Analog +5V supply |
| Chân 2 | GND — Ground |
| Chân 3 | REF — External 2.5V reference input |
| Chân 4 | SCLK — Serial clock input |
| Chân 5 | SDATA — Serial data output |
| Chân 6 | CS — Chip select (active low) |
| Chân 7 | VIN — Analog input |
| Chân 8 | SHDN — Shutdown control (active high) |
Ứng dụng tiêu biểu
ISL267450AIHZ-T7A phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL267450AIHZ-T7A — 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 | 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 |
Bảo phân biệt quan trọng
- Only SOT-23-8 12-bit 1 MSPS SAR ADC in the ISL2674xx family with industrial-temperature qualification (vsISL267440AIHZ-T7A)
- Compact 8-pin SOT-23-8 package vs larger 10-pin MSOP and 8-pin SOIC alternatives (vsADS7883 (TI))
- Single +5V analog supply simplifies power architecture (vsAD7476A (ADI))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
