ISL26323FBZ-T - 12-bit 250kSPS Dual-Channel Low-Power SAR ADC | Renesas
MPN: ISL26323FBZ-T ✓ Hoạt độngISL26323FBZ-T Tóm tắt
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm to convert an analog input to a digital code in a fixed number of clock cycles, typically one per bit. SAR ADCs sit within the broader data-converter family (SAR -> ADC -> data converter -> mixed-signal IC -> semiconductor), and are valued for their deterministic latency, low power consumption, and high effective resolution per sample. The ISL26323FBZ-T specifically targets the 12-bit precision segment with sample rates up to 250 kSPS, making it well suited for industrial sensor readout, multi-channel data acquisition, and instrumentation front ends.
Key features of the ISL26323FBZ-T include up to 5 kV Human Body Model ESD survivability, guaranteed monotonic operation, and an industrial temperature range of -40 °C to +125 °C. Its single-ended/differential input flexibility allows the same PCB footprint to accept either sensor type without a re-design, while the SPI/serial digital interface reduces microcontroller pin count compared to parallel-output ADCs.
Typical applications include industrial process control loops, multi-channel temperature and pressure monitoring, PLC analog input modules, battery-cell voltage monitoring in BMS front ends, and general-purpose data-acquisition systems. The wide analog supply range (2.7 V to 5.25 V) supports both 3.3 V and 5 V microcontroller environments with the same BOM.
When designing with this part, ensure the analog and digital grounds are tied together at a single point near the IC, and place the 10 µF bulk + 0.1 µF bypass capacitors as close to the AVDD pin as possible. The SOT-23-6/8-SOIC thermally enhanced package allows continuous operation at full sample rate without thermal throttling, but the input RC antialiasing filter should be sized to keep the -3 dB bandwidth below the Nyquist frequency of 125 kHz for 250 kSPS throughput.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives, and practical design notes not consolidated in the Renesas datasheet PDF.
Bộ thay thế dễ dàng lắp đặt cho ISL26323FBZ-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 ISL26323FBZ-T (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Interface, Number of Input Channels, Operating Temperature Range.
ISL26323FBZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26322FBZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26324FBZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26321FBZ-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26320FBZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26323FBZ-T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Sample Rate | 250 kSPS |
| Number of Channels | 2 (differential/single-ended, software configurable) |
| Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Input Type | Single-ended or differential (software-selectable) |
| Digital Interface | SPI / serial-compatible |
| ESD Survivability | 5 kV HBM |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C (industrial) |
| Hộp | 8-pin SOIC (N) — JEDEC MS-012 |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | MSL1 (per JEDEC J-STD-020, assumed for SOIC) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ISL26323FBZ-T
| Chân 1 | CS/SHDN — Chip select / shutdown (active low) |
| Chân 2 | AIN+ — Analog input positive (single-ended or differential) |
| Chân 3 | AIN- — Analog input negative (tied to GND in single-ended mode) |
| Chân 4 | GND — Ground |
| Chân 5 | REF — Reference voltage input (decouple with 10uF + 0.1uF) |
| Chân 6 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Chân 7 | SCLK — Serial clock input |
| Chân 8 | SDOUT/DOUT — Serial data output |
Ứng dụng tiêu biểu
ISL26323FBZ-T phù hợp cho 7 Áp dụngs: Industrial Process Control Loop, Multi-Channel Temperature Monitoring, PLC Analog Input Module, Battery Management System (BMS) Cell Voltage Monitoring, General-Purpose Data Acquisition (DAQ) System, Sensor Signal Conditioning Front End, Portable / Handheld Test Instruments.
Industrial Process Control Loop
The ISL26323FBZ-T's 12-bit resolution and 250 kSPS throughput suit closed-loop industrial process control, where 2 differential channels accept signals from current-loop transducers (4-20 mA) after a sense resistor. The wide 2.7 V to 5.25 V AVDD range lets the same ADC interface directly to 3.3 V or 5 V microcontrollers used in PLC analog-input modules. SPI serial interface reduces MCU pin count versus parallel-output SAR ADCs, while the -40 °C to +125 °C industrial temperature range ensures continuous operation in factory cabinets.
Được đề xuất
Multi-Channel Temperature Monitoring
The ISL26323FBZ-T can scan two thermistor or RTD bridges simultaneously at 250 kSPS aggregate, supporting parallel temperature probes in HVAC and refrigeration systems. The software-configurable single-ended/differential input lets the same pin pair read either a resistive divider (single-ended) or a Wheatstone bridge (differential) without hardware rework. The low power consumption preserves battery life in portable temperature dataloggers, while the 5 kV HBM ESD rating protects against ESD events common during field installation of sensor cables.
Được đề xuất
PLC Analog Input Module
The ISL26323FBZ-T's SPI-compatible serial interface and 2-channel input make it ideal for compact PLC analog-input modules where PCB area is at a premium. Up to 250 kSPS allows simultaneous sampling of two analog signals with deterministic cycle time, critical for time-correlated measurements in industrial automation. The SOIC-8 package is hand-solderable for prototypes and is JEDEC MS-012 standard, easing PCB layout and rework.
Được đề xuất
Battery Management System (BMS) Cell Voltage Monitoring
The ISL26323FBZ-T monitors up to 2 series-stacked Li-ion cells with 12-bit resolution (4.88 mV per LSB at 5 V reference), enabling accurate cell-balancing decisions in BMS front ends. The 2.7 V to 5.25 V AVDD range supports 3.3 V or 5 V bias rails used in portable battery packs, while the low quiescent current preserves battery life in standby. The 5 kV HBM ESD withstands hot-plug transients common during battery pack assembly.
Được đề xuất
General-Purpose Data Acquisition (DAQ) System
The ISL26323FBZ-T integrates into USB-based DAQ modules and benchtop instruments requiring 2 analog inputs at 12-bit/250 kSPS. Its serial interface simplifies isolation barrier design (fewer digital lines to isolate) and supports up to 16 devices on one SPI bus through CS/SHDN bar chip-select, multiplying the effective channel count without extra MCU pins. The industrial -40 °C to +125 °C range ensures reliable operation in lab and field environments.
Được đề xuất
Sensor Signal Conditioning Front End
The ISL26323FBZ-T digitizes outputs from bridge sensors (load cells, pressure transducers) thanks to its differential input mode, eliminating the need for an external instrumentation amplifier in many 12-bit applications. The SAR architecture provides no-latency conversion (one sample per trigger) for synchronous data capture, while the 2.7 V to 5.25 V AVDD supports bridge excitation voltages of 3.3 V or 5 V from the same rail. Industrial temperature range suits outdoor sensor installations.
Được đề xuất
Portable / Handheld Test Instruments
The ISL26323FBZ-T's low-power SAR architecture and 2-channel input fit handheld multimeters and insulation testers requiring accurate voltage and current measurements from a single battery pack. Its small SOIC-8 footprint suits cramped handheld enclosures, while the SPI interface allows direct connection to low-pin-count microcontrollers. The 5 kV HBM ESD rating survives cable-discharge events common in field instrumentation.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL26323FBZ-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 | ISL26323FBZ-T7A | ISL26322FBZ-T | ISL26324FBZ-T | ISL26321FBZ-T | ISL26320FBZ-T7A |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | SOIC-8 (JEDEC MS-012) | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Number of Channels | 2 (single-ended or differential) | 2 (same) | 2 (single-ended only) | 4 (single-ended/differential) | 1 (differential) | 1 (single-ended) |
| AVDD Range | 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 |
| Digital Interface | SPI/serial | SPI/serial | SPI/serial | SPI/serial | SPI/serial | SPI/serial |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Reel Quantity | 1000 pcs (-T) | 250 pcs (-T7A) | 1000 pcs | 1000 pcs | 1000 pcs | 250 pcs |
Bảo phân biệt quan trọng
- Pin-compatible family upgrade path from 1 to 4 channels (vsISL26320FBZ-T7A (1-ch single-ended))
- Software-configurable single-ended or differential inputs in same package (vsISL26321FBZ-T (1-channel differential-only))
- Wide AVDD range (2.7 V to 5.25 V) supports 3.3 V and 5 V rails (vsADS7825UE4 (TI 5 V only))
- 5 kV HBM ESD rating for industrial robustness (vsAD7920BRMZ (no ESD rating published))
Ghi chú thiết kế
Decouple AVDD (pin 6) with a 10 µF tantalum or ceramic bulk capacitor plus a 0.1 µF ceramic placed within 5 mm of the pin. The reference input (REF, pin 5) requires the same 10 µF + 0.1 µF pair - inadequate REF decoupling is the leading cause of noisy SAR ADC readings. AVDD and REF should track each other; route them with wide (>20 mil) traces and a star-ground topology.
Keep the analog input traces (AIN+, AIN-) short and symmetric to avoid common-mode noise pickup. Use a guard ring tied to GND around the input traces if the surrounding PCB has switching converter or digital logic. Place the IC away from high-dV/dt traces (switching node of buck regulators, clock signals) by at least 5 mm or shield with a grounded copper fill.
Estimated: at 250 kSPS through a single RC antialiasing filter with R = 1 kΩ and C = 1 nF, the -3 dB bandwidth is approximately 160 kHz, which is ABOVE the Nyquist frequency of 125 kHz for 250 kSPS. Either increase R or decrease C to push the filter cutoff below 125 kHz, or accept aliasing of out-of-band noise. The default CS/SHDN bar pin must be pulled high between conversions to keep the part in normal mode; leaving it floating forces shutdown and yields all-zero readings.
The SOIC-8 package benefits from a small thermal pad (pin 4 GND copper pour) to reduce ground bounce. Route the SPI digital lines (SCLK, SDOUT) on the opposite side of the PCB from the analog inputs to avoid digital-to-analog crosstalk. If multiple ISL2632x ADCs share one SPI bus, give each its own CS/SHDN bar signal rather than daisy-chaining.
Thông tin tuân thủ
RoHS and lead-free status per Renesas product page. Industrial temperature grade -40 °C to +125 °C (not AEC-Q100 automotive qualified).
