ISL267452IHZ-T7A - 12-Bit 555kSPS SAR ADC | Renesas
MPN: ISL267452IHZ-T7A ✓ NakahandaISL267452IHZ-T7A Ulas
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.
Mga alternatibo na pwedeng ilagay na ISL267452IHZ-T7A — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
ISL267452IHZ-T
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
ISL267450A
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
ISL267440
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7452
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7452BRTZ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
ISL267452IHZ-T7A Mga Pinakamataas na Rating at Electrical Characteristics
| Pangangasiwaan | 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 |
| Hanay ng Voltage ng Input | 0 V to AVDD (true rail-to-rail input) |
| Temperature na Operasyon | -40 C to +85 C (Industrial) |
| Packhaging | SOT-23-8 |
| Package Marking | 7452 |
| Uri ng Pagpapasok | Surface Mount |
| Screening Level | Industrial |
| Tindminan RoHS | Compliant |
| Bilang ng Pin | 8 |
| Drop-in Compatibility | Pin-compatible with AD7452 (Analog Devices) |
Pin Configuration ng ISL267452IHZ-T7A
| Pin 1 | AIN+ — Differential analog input, non-inverting |
| Pin 2 | GND — Analog ground |
| Pin 3 | AVDD — Analog supply, 2.7 V to 5.25 V |
| Pin 4 | VREF — Reference voltage input |
| Pin 5 | GND — Digital ground |
| Pin 6 | CS — Chip select (active low) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | SDATA — Serial data output |
Tipikal na mga Gamit
ISL267452IHZ-T7A ay nararapat para sa 6 aplikasyons: 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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for ISL267452IHZ-T7A — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | 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 |
Pangunahing mga Pagkakaiba
- Pin-compatible second source for AD7452 in SOT-23-8 (kumpara saAD7452)
- Lower throughput vs 1 MSPS siblings but adequate for most MCU-driven designs (kumpara saISL267450A)
- True-differential input with rail-to-rail input range (kumpara saSingle-ended-only SAR ADCs)
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
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.
