ISL26325FVZ - 12-Bit 250kSPS 4-Channel SAR ADC | Renesas
MPN: ISL26325FVZ ✓ Hoạt độngISL26325FVZ Tóm tắt
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against an internal DAC to resolve each conversion in N bit-clock cycles. SAR ADCs offer the best trade-off among speed, resolution, and latency for precision multiplexed applications. They are a sub-category of data converters, which sit within the broader signal-chain IC family alongside amplifiers, filters, and references.
Key features of the ISL26325FVZ include 12-bit resolution, 250 kSPS throughput, a proprietary input multiplexer and combination buffer amplifier that lowers input drive requirements, integrated sequencer support, and excellent linearity over supply and temperature. The Auto Power-down function reduces idle current dramatically between bursts, extending battery life in portable instruments.
The internal architecture pairs a capacitive-DAC SAR core with a low-leakage input MUX and on-chip reference buffer, allowing the converter to maintain INL/DNL performance over the full -40 °C to +125 °C automotive temperature range. The SPI/QSPI/MICROWIRE-compatible serial port supports daisy-chaining multiple devices for high-channel-count systems.
Typical applications include industrial process control and PLC analog front ends, automotive sensor monitoring, battery-management telemetry, portable instrumentation, and multi-zone temperature or pressure monitoring. Designers often pair the ISL26325 with a precision op-amp driver and an external 2.5 V or 4.096 V reference to maximize absolute accuracy.
When designing the input front end, ensure the source impedance stays below the value recommended in the manufacturer datasheet to avoid gain errors. The Auto Power-down mode assumes a stable clock and consistent CS framing - verify timing in your MCU's SPI peripheral before relying on the lowest quiescent current.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not found in the manufacturer datasheet alone, helping engineers shorten the selection cycle and avoid common pitfalls.
Bộ thay thế dễ dàng lắp đặt cho ISL26325FVZ — 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 ISL26325FVZ (cùng hình factor và footprint) — khác nhau ở Package, Number of Input Channels, Input Type, Interface, Resolution.
ISL26325FVZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26325FVZ-T13
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISL26320FBZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26315FVZ-T7A
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26312FVZ-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ISL26325FVZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Tỷ lệ lấy mẫu | 250 kSPS |
| Number of Input Channels | 4 single-ended / 2 differential |
| Architecture | SAR (Successive Approximation) |
| Điện áp cung cấp | 5 V nominal |
| Power Consumption (Active) | 15 mW at 250 kSPS |
| Power Consumption (Auto Power-down) | 8 µA typical between conversions |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Input Type | Single-Ended and Differential |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| Hộp | 16-TSSOP (4.40 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Số lượng chân | 16 |
| Auto Power-down Mode | Yes |
| Family | ISL26320 / ISL26321 / ISL26322 / ISL26323 / ISL26324 / ISL26325 / ISL26329 |
| Trạng thái RoHS | Compliant |
Cấu hình chân ISL26325FVZ
| Chân 1 | AIN0 — Analog input channel 0 |
| Chân 2 | AIN1 — Analog input channel 1 |
| Chân 3 | AIN2 — Analog input channel 2 |
| Chân 4 | AIN3 — Analog input channel 3 |
| Chân 5 | REF — Voltage reference input |
| Chân 6 | GND — Analog ground |
| Chân 7 | VDD — Analog supply voltage (5 V) |
| Chân 8 | CS — Chip select, active low |
| Chân 9 | SCLK — Serial clock input |
| Chân 10 | DOUT — Serial data output |
| Chân 11 | DIN — Serial data input |
| Chân 12 | SHDN — Shutdown, active low |
| Chân 13 | A0 — Channel/address select 0 |
| Chân 14 | A1 — Channel/address select 1 |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ISL26325FVZ phù hợp cho 6 Áp dụngs: Industrial Process Control & PLC Analog Front End, Automotive Sensor Monitoring, Battery Management Telemetry, Portable Multi-Channel Instrumentation, Multi-Zone Temperature Monitoring, Data Acquisition Front End for Embedded Systems.
Industrial Process Control & PLC Analog Front End
The ISL26325FVZ's 4 single-ended (or 2 differential) inputs are well matched to multi-channel PLC analog modules where 4-20 mA current loops or 0-10 V voltage signals must be digitized. At 250 kSPS aggregate throughput the part oversamples a 4-channel scan with ample margin, and the proprietary input multiplexer eliminates external driver op-amps. Auto Power-down drops quiescent current to 8 µA typical between scans, lowering module thermal rise in dense 32-channel rack designs. Designers commonly pair it with a precision external 4.096 V reference for 1 mV LSB resolution.
Được đề xuất
Automotive Sensor Monitoring
The ISL26325FVZ operates across the full -40 °C to +125 °C automotive temperature range, making it suitable for body and chassis sensor monitoring. Four differential-pair inputs can digitize strain-gauge bridge outputs from suspension or brake-pressure sensors, while the SPI interface simplifies connection to automotive MCUs. The 8 µA Auto Power-down current helps body-control modules meet quiescent-current budgets when the vehicle is parked. AEC-Q100 screening status should be confirmed with Renesas before deployment in safety-critical systems.
Được đề xuất
Battery Management Telemetry
Battery-management systems in e-mobility and energy-storage applications require precise per-cell voltage monitoring with low standby drain. The ISL26325FVZ's 4-channel input MUX supports direct connection to cell-sense resistors and pack-voltage dividers, while the 8 µA Auto Power-down current preserves battery capacity during idle periods. The 12-bit resolution yields 1 mV LSB with a 4.096 V reference, sufficient for cell-balancing decisions in LiFePO4 and Li-ion packs up to 48 V nominal.
Được đề xuất
Portable Multi-Channel Instrumentation
Handheld oscilloscopes, dataloggers, and field instruments require low power, small footprint, and multi-channel capability in a single package. The ISL26325FVZ delivers 4 channels in a compact 16-TSSOP at 15 mW active power, fitting battery-powered designs where every milliwatt matters. The 250 kSPS throughput is sufficient for vibration, temperature, and strain-gauge sampling at audio-bandwidth rates. SPI daisy-chaining enables 8 or 12 channel expansion using only one MCU serial port.
Được đề xuất
Multi-Zone Temperature Monitoring
HVAC controllers and server-rack thermal managers need to monitor several zones with high absolute accuracy. The ISL26325FVZ's 4 channels can be routed to four remote diode sensors via external op-amp buffers, or directly to four thermistor voltage dividers. The 12-bit resolution provides 0.125 °C resolution when paired with a 10 mV/°C thermistor interface circuit. Auto Power-down reduces idle current to 8 µA, allowing continuous thermal monitoring in energy-starved IoT edge devices.
Được đề xuất
Data Acquisition Front End for Embedded Systems
Embedded DAQ cards based on FPGAs and microcontrollers benefit from the ISL26325FVZ's SPI interface and daisy-chain capability. The part drops into a 16-TSSOP footprint with a 5 V supply, directly compatible with common 5 V-tolerant FPGA GPIO banks. With 250 kSPS throughput per channel, the converter can serve as the analog front end for vibration analysis, audio-bandwidth DSP, or control-loop feedback in motor-control applications. The 12-bit output word fits cleanly in 16-bit SPI frames, simplifying firmware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISL26325FVZ — 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 | ISL26325FVZ-T7A | ISL26325FVZ-T13 | ISL26320FBZ-T7A | ISL26315FVZ-T7A | ISL26312FVZ-T |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 8-MSOP | 16-TSSOP | 16-TSSOP |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 125 kSPS (-50%) |
| Input Channels | 4 single-ended / 2 differential | 4 single-ended / 2 differential | 4 single-ended / 2 differential | 1 single-ended / 1 differential | 2 single-ended / 1 differential | 4 single-ended / 2 differential |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Auto Power-down Current | 8 µA | 8 µA | 8 µA | 8 µA | 8 µA | 8 µA |
Bảo phân biệt quan trọng
- Proprietary input multiplexer with combination buffer amplifier reduces external drive requirements (vsISL26320FBZ-T7A)
- 4 single-ended channels in 16-TSSOP with SPI daisy-chaining (vsISL26315FVZ-T7A)
- 8 µA Auto Power-down current for battery applications (vsISL26312FVZ-T)
Ghi chú thiết kế
Place the 0.1 µF VDD decoupling capacitor as close as possible to pin 7, with a trace length below 3 mm. According to standard ADC layout practice referenced in the Renesas datasheet family, a star-ground topology with separate analog and digital ground returns reduces digital switching noise coupling into the analog front end. The REF pin (pin 5) should be bypassed with a 1 µF ceramic and 10 µF tantalum or ceramic combination to suppress reference noise.
Keep the SCLK trace short and route it away from the analog input traces to avoid capacitive coupling that injects clock-edge noise into the sample-and-hold. A 33 Ω series-termination resistor near the SCLK source can help dampen reflections on long SPI bus runs, especially when the MCU is on a separate board. Use a ground guard trace between AIN lines and digital signals if routing density forces proximity.
Do not leave the SHDN pin floating - it must be tied high (active low) for normal operation. According to the Renesas datasheet, the SHDN pin is internally pulled weakly; external noise can cause unintended shutdown events. Tie SHDN directly to VDD with a 10 kΩ resistor for robustness in noisy industrial environments. Verify the external reference voltage is stable before CS framing begins, since Auto Power-down assumes a valid reference for proper wake-up timing.
Thông tin tuân thủ
RoHS and REACH compliance confirmed via Renesas product page. AEC-Q100 status not explicitly stated in retrieved data - confirm with Renesas factory for automotive safety-critical deployments.
