ISL267452IHZ-T7A - 12-Bit 555kSPS SAR ADC | Renesas
Артикул: ISL267452IHZ-T7A ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.12 | $4,12 |
| 10 | $3.78 | $37,80 |
| 100 | $3.21 | $321,00 |
| 500 | $2.74 | $1.370,00 |
| 1.000 | $2.31 | $2.310,00 |
ISL267452IHZ-T7A Обзор
A SAR ADC is a successive-approximation-register analog-to-digital converter. It uses an internal binary-search algorithm with a single comparator and a charge-redistribution DAC to digitize an analog input one code at a time, achieving excellent DC accuracy and very low latency (one conversion cycle) compared to delta-sigma or pipelined converters. SAR ADCs belong to the data-converter family alongside delta-sigma ADCs, pipeline ADCs, and flash ADCs, and they sit inside the broader mixed-signal IC hierarchy under signal conditioning and data acquisition.
Key features include 12-bit resolution with no missing codes, 555 kSPS throughput, low power consumption of approximately 5.2 mW at 555 kSPS, an SPI/QSPI/MICROWIRE-compatible serial interface, and true-differential analog inputs that maintain specified accuracy for input signals up to the supply rails. The high-impedance analog input structure minimizes leakage-induced errors in high-impedance source applications such as sensor front-ends.
The architecture is based on a charge-redistribution SAR core with on-chip track-and-hold. Renesas states the part is pin-compatible with the legacy AD7452 from Analog Devices, allowing it to serve as a drop-in second-source. The single-supply 2.7 V minimum operation makes it well suited to 3.3 V and 5 V microcontroller-based systems without requiring additional negative rails.
Typical applications include industrial process control, portable instrumentation, data acquisition systems, battery-powered monitoring, and optical sensor front-ends. The combination of small SOT-23-8 footprint, 555 kSPS speed, and 12-bit accuracy makes it ideal where board area is constrained and full pipeline ADC speed is not required.
When designing with this part, ensure the analog input common-mode voltage stays within the specified range and provide a low-impedance reference (such as a 10 uF ceramic bypass on REF) to avoid conversion noise. The SOT-23-8 thermal envelope is more than adequate for the 5.2 mW dissipation, so no special thermal management is needed.
This page synthesizes distributor pricing from DigiKey, Mouser, and Octopart, drop-in and same-package alternatives, and practical design notes for the ISL267452 family that go beyond what is in the manufacturer datasheet alone.
Аналоги без доработки для ISL267452IHZ-T7A — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ISL267452IHZ-T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL267450A
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL267440
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD7452
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD7452BRTZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISL267452IHZ-T7A Максимальные параметры и электрические характеристики
| Разрешение | 12 bit |
| Number of Channels | 1 Input |
| ADC Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 555 kSPS |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Analog Input Type | Single-Ended / Fully-Differential |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Диапазон входного напряжения | 0 V to AVDD (true rail-to-rail input) |
| Рабочая температура | -40 C to +85 C (Industrial) |
| Корпус | SOT-23-8 |
| Package Marking | 7452 |
| Тип монтажа | Surface Mount |
| Screening Level | Industrial |
| Статус RoHS | Compliant |
| Число выводов | 8 |
| Drop-in Compatibility | Pin-compatible with AD7452 (Analog Devices) |
Конфигурация выводов ISL267452IHZ-T7A
| Контакт 1 | AIN+ — Differential analog input, non-inverting |
| Контакт 2 | GND — Analog ground |
| Контакт 3 | AVDD — Analog supply, 2.7 V to 5.25 V |
| Контакт 4 | VREF — Reference voltage input |
| Контакт 5 | GND — Digital ground |
| Контакт 6 | CS — Chip select (active low) |
| Контакт 7 | SCLK — Serial clock input |
| Контакт 8 | SDATA — Serial data output |
Типичное применение
ISL267452IHZ-T7A подходит для 6 применениеs: Industrial Process Control Loops, Portable Battery-Powered Instrumentation, Optical Sensor Front-Ends, Data Acquisition Systems, Automotive Telematics and Sensor Readout, Energy and Power Monitoring.
Industrial Process Control Loops
The ISL267452IHZ-T7A's 12-bit resolution and 555 kSPS sampling rate fit closed-loop control applications such as PLC analog input modules, valve position sensing, and 4-20 mA current loop digitisation. The true-differential input rejects common-mode noise from long sensor cable runs typical of factory floors, while the 2.7 V to 5.25 V single supply simplifies interface to 3.3 V or 5 V microcontrollers. The SOT-23-8 footprint keeps analog input stage density high where 4- or 8-channel cards are populated. Industrial -40 C to +85 C operation aligns with IEC 60068-2 environmental test profiles for control cabinets.
Рекомендуется
Portable Battery-Powered Instrumentation
The ISL267452IHZ-T7A is well suited to battery-powered handheld multimeters, data loggers, and portable medical monitoring devices. The 12-bit SAR architecture provides low latency (one conversion cycle), enabling real-time readout without DSP calibration overhead. The single 2.7 V to 5.25 V supply means a single lithium cell or 3.3 V regulator powers the entire analog chain. The SOT-23-8 package is among the smallest 12-bit SAR options available, and the ~5.2 mW power consumption preserves battery life in always-on instruments that wake periodically for sensor reads.
Рекомендуется
Optical Sensor Front-Ends
Photodiode and phototransducer front-ends benefit from the ISL267452IHZ-T7A's true-differential input and high input impedance, which minimise leakage-induced errors when digitising currents in the microampere range. The 555 kSPS throughput supports pulse-oximeter and spectrometer applications that digitise high-speed light transients. The small SOT-23-8 footprint is ideal for wearable oximeters and in-line spectrometer probes where board real estate is critical. The on-chip track-and-hold minimises aperture-delay variation in laser-ranging circuits.
Рекомендуется
Data Acquisition Systems
Modular data-acquisition boards that require a compact 12-bit analog front-end per channel can use the ISL267452IHZ-T7A alongside external multiplexers for multi-channel scanning. The 555 kSPS sampling rate is well matched to digitising 4-8 multiplexed sensor channels at 50-100 kSPS per channel. The SPI interface allows daisy-chained connection with chip-select lines from a single microcontroller, simplifying board routing. Industrial -40 C to +85 C operation supports outdoor and harsh-environment DAQ installations.
Рекомендуется
Automotive Telematics and Sensor Readout
Although not AEC-Q100 qualified, the ISL267452IHZ-T7A is used in non-safety automotive telematics modules such as OBD-II dongles, GPS asset trackers, and tyre-pressure-monitoring test fixtures. The 12-bit resolution digitises pressure, temperature, and battery voltage sensors with adequate accuracy for telemetry. The 2.7 V to 5.25 V supply tolerates 12 V battery drops regulated down by automotive LDOs, and the SOT-23-8 footprint supports dense sensor cluster PCBAs. For safety-critical functions, an AEC-Q100 qualified ADC is required.
Рекомендуется
Energy and Power Monitoring
Smart-meter analog front-ends and energy-monitoring sensors use the ISL267452IHZ-T7A to digitise current-sense amplifier outputs, voltage dividers, and temperature probes. The 12-bit resolution yields 0.025% full-scale quantisation, sufficient for class-0.5 energy meters when combined with a precision current shunt. The true-differential input rejects ground bounce from power-conversion stages sharing the same ground. The SOT-23-8 small package supports dense CT (current transformer) and Rogowski-coil metering boards.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ISL267452IHZ-T7A — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ISL267452IHZ-T | ISL267450A | ISL267440 | AD7452 | AD7452BRTZ |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Analog Devices |
| Package | SOT-23-8 | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same | SOT-23-8 - same |
| Resolution | 12 bit | 12 bit | 12 bit | 10 bit | 12 bit | 12 bit |
| Sample Rate | 555 kSPS | 555 kSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Input Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Input Type | True differential / single-ended | True differential / single-ended | True differential / single-ended | True differential / single-ended | True differential / single-ended | True differential / single-ended |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Ключевые отличия
- Pin-compatible second source for AD7452 in SOT-23-8 (против AD7452)
- Lower throughput vs 1 MSPS siblings but adequate for most MCU-driven designs (против ISL267450A)
- True-differential input with rail-to-rail input range (против Single-ended-only SAR ADCs)
Заметки по проектированию
Place a 1 uF X5R/X7R ceramic decoupling capacitor within 2 mm of the AVDD pin and a 0.1 uF high-frequency bypass in parallel. For supply rails with switching noise from upstream DC-DC converters, add a 10 uF tantalum bulk cap to suppress ripple below the 12-bit quantisation step (approximately 1.2 mV at 5 V reference). Reference pin decoupling with at least 1 uF ceramic is recommended for AC-accurate conversions. AVDD and DVDD can share a rail if the noise is below 1 mV; for precision applications, separate the analog and digital supplies with a ferrite bead.
Route the analog input traces as a true differential pair with impedance matched to the source amplifier output. Keep analog and digital grounds separated with a single star ground at the AGND pin. The SCLK line should be series-terminated with 33 ohm to prevent ringing at high clock rates above 20 MHz. For input signals above 50 kHz, add a 10 pF to 100 pF anti-aliasing capacitor on the AIN+ pin to limit input bandwidth to one-half the sampling rate.
Do not drive the analog input beyond the AVDD rail or below AGND - the ESD protection diodes will conduct and distort the conversion. The CS pin must be held low for the entire conversion and read cycle; toggling CS mid-conversion causes data corruption. For multi-device SPI buses, ensure SDATA is high-Z between conversions; if the host reads other devices on the same bus, verify the ISL267452IHZ-T7A releases SDATA within 30 ns of CS going high. Do not operate the part with a VREF below 2.0 V - the SNR will degrade significantly.
Estimated: at 5.25 V supply and 555 kSPS, the ISL267452IHZ-T7A dissipates approximately 5.2 mW. The SOT-23-8 package has a thermal resistance of about 200 C/W, yielding a 1 C junction-temperature rise above ambient. Thermal management is not a concern in normal operation. Even at the maximum 85 C ambient industrial limit, the junction stays at 86 C, well below the 150 C maximum. If the part is used in a sealed enclosure with no airflow, add a small thermal via pattern under the GND pins to share heat with the PCB ground plane.
Информация о соответствии
RoHS compliant per Renesas product page and DigiKey listing. SOT-23-8 package is lead-free and halogen-free. Not AEC-Q100 qualified - for automotive safety-critical applications, select a qualified ADC such as the ADCS7478AIMFX or other AEC-Q100 listed alternatives.
