ISL26325FVZ - 12-Bit 250kSPS 4-Channel SAR ADC | Renesas
MPN: ISL26325FVZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.8 | $4.80 |
| 10 | $4.32 | $43.20 |
| 100 | $3.85 | $385.00 |
| 500 | $3.47 | $1,735.00 |
| 1,000 | $3.1 | $3,100.00 |
ISL26325FVZ Overview
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.
Drop-in alternatives for ISL26325FVZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISL26325FVZ (same form factor and footprint) — differing in Package, Number of Input Channels, Input Type, Interface, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26325FVZ-T7A
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →ISL26325FVZ-T13
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26320FBZ-T7A
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →ISL26315FVZ-T7A
✅ Drop-In✓ In Stock
$2.52 / Unit
View Datasheet →ISL26312FVZ-T
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →ISL26325FVZ Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sampling Rate | 250 kSPS |
| Number of Input Channels | 4 single-ended / 2 differential |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage | 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 |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 16-TSSOP (4.40 mm body width) |
| Mounting Type | Surface Mount |
| Number of Pins | 16 |
| Auto Power-down Mode | Yes |
| Family | ISL26320 / ISL26321 / ISL26322 / ISL26323 / ISL26324 / ISL26325 / ISL26329 |
| RoHS Status | Compliant |
ISL26325FVZ Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | REF — Voltage reference input |
| Pin 6 | GND — Analog ground |
| Pin 7 | VDD — Analog supply voltage (5 V) |
| Pin 8 | CS — Chip select, active low |
| Pin 9 | SCLK — Serial clock input |
| Pin 10 | DOUT — Serial data output |
| Pin 11 | DIN — Serial data input |
| Pin 12 | SHDN — Shutdown, active low |
| Pin 13 | A0 — Channel/address select 0 |
| Pin 14 | A1 — Channel/address select 1 |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
Typical Applications
ISL26325FVZ is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ISL26325FVZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Proprietary input multiplexer with combination buffer amplifier reduces external drive requirements (vs ISL26320FBZ-T7A)
- 4 single-ended channels in 16-TSSOP with SPI daisy-chaining (vs ISL26315FVZ-T7A)
- 8 µA Auto Power-down current for battery applications (vs ISL26312FVZ-T)
Design Notes
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.
Compliance Information
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.
