ISL267450AIUZ-T - 12-Bit 1MSPS SAR ADC | Renesas | MSOP-8
MPN: ISL267450AIUZ-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.53 | $6.53 |
| 10 | $5.82 | $58.20 |
| 100 | $4.85 | $485.00 |
| 500 | $4.05 | $2,025.00 |
| 1,000 | $3.4 | $3,400.00 |
| 2,500 | $2.95 | $7,375.00 |
ISL267450AIUZ-T Overview
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that performs a binary search through successive bit trials to resolve an analog input into a digital code. SAR ADCs sit in the broader hierarchy of data converter -> ADC -> Nyquist-rate converter -> SAR architecture, where they are valued for zero-latency conversion, low power consumption, and deterministic behavior, making them a preferred choice for multiplexed data acquisition and precision industrial sensing.
Key features of the ISL267450AIUZ-T include a 12-bit resolution with no missing codes, a single 2.7 V to 5.25 V supply, an SPI/QSPI/MICROWIRE-compatible serial data interface, an integrated track-and-hold amplifier, and very low power dissipation. Per the manufacturer datasheet, the device is drop-in pin-compatible with the AD7450A from Analog Devices, simplifying migration paths for new and existing designs.
Architecturally, the ISL267450AIUZ-T combines a charge-redistribution DAC with a high-speed comparator and SAR control logic on a single CMOS die. The internal reference voltage is 2.5 V, while the analog input accepts a 0 V to VREF unipolar range. Power-down current drops to 1 µA between conversions, an important figure for battery-operated instruments that sample on demand.
Typical applications include remote industrial sensors, battery-powered instrumentation, portable data loggers, and process control front ends. The combination of 1 MSPS throughput, low power, and small MSOP-8 footprint also makes it attractive for medical patient monitoring and energy harvesting sensor nodes.
When designing with this ADC, allocate at least one 10 nF bypass capacitor close to the AVDD pin and route the analog and digital grounds as a star-connected pattern to avoid code-dependent noise coupling. Because it is a 1 MSPS SAR, settle the input amplifier to better than 12-bit accuracy within the acquisition window.
This page synthesizes distributor pricing, drop-in compatible alternatives, and engineering design guidance not found in a single source - useful for engineers who need to evaluate, qualify, and second-source the ISL267450AIUZ-T in production designs.
Drop-in alternatives for ISL267450AIUZ-T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL267450AIUZ-T7A
✅ Drop-In📋 Reference alternative (not in catalog)
ISL267450AIUZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL267440IHZ-T
✅ Drop-In📋 Reference alternative (not in catalog)
AD7450ABRMZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL267450AIUZ-T Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate | 1 MSPS (1000 kSamples/sec) |
| Number of Channels | 1 input |
| Input Type | Single-ended, pseudo-differential |
| Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Digital I/O Supply | 2.7 V to 5.25 V |
| Internal Reference Voltage | 2.5 V |
| Analog Input Range | 0 V to VREF |
| Power Dissipation (1 MSPS, 3 V) | 4.2 mW |
| Power-Down Current | 1 µA |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| Package | 8-pin MSOP (3.00 mm × 3.00 mm) |
| Screening Level | Industrial |
| Mounting Type | Surface Mount (Gull Wing) |
| RoHS Status | RoHS Compliant |
ISL267450AIUZ-T Pin Configuration
| Pin 1 | REF — Reference voltage input/output (2.5 V internal) |
| Pin 2 | IN+ — Analog positive input (single-ended) |
| Pin 3 | IN- — Analog negative/ground-sense input |
| Pin 4 | GND — Analog ground |
| Pin 5 | CS — Chip select (active low, frames serial data) |
| Pin 6 | SCLK — Serial clock input |
| Pin 7 | SDATA — Serial data output |
| Pin 8 | VDD — Analog supply voltage (2.7 V to 5.25 V) |
Typical Applications
ISL267450AIUZ-T is suitable for 6 applications: Remote Industrial Sensor Signal Chains, Battery-Powered Data Loggers, Process Control Front Ends, Portable Medical Patient Monitors, Energy Harvesting Sensor Nodes, Industrial Data Acquisition Cards.
Remote Industrial Sensor Signal Chains
The ISL267450AIUZ-T is ideal for remote industrial sensor front ends that digitize 4-20 mA or 0-10 V signals from pressure, flow, and temperature transducers. Its 12-bit resolution at 1 MSPS captures fast transients while the 1 µA power-down current enables aggressive duty cycling on battery-powered nodes. The wide 2.7 V to 5.25 V supply accepts common 3.3 V and 5 V industrial rails, and the SPI/QSPI/MICROWIRE-compatible serial output streams data directly to microcontrollers such as the Renesas RX or RA family without external glue logic. Compared to a sigma-delta ADC it offers zero latency, so closed-loop control loops can read a fresh conversion on every trigger edge.
Recommended
Battery-Powered Data Loggers
Portable data loggers running from 3 V lithium primary cells rely on the ISL267450AIUZ-T's 4.2 mW at 1 MSPS and 1 µA power-down figure to stretch battery life over multi-year deployments. Designers can wake the part on a sample timer, perform one burst conversion, then return to sleep - a duty cycle where quiescent draw dominates. The 12-bit no-missing-code accuracy captures sensor excursions with sufficient resolution for environmental and asset-tracking telemetry, while the small MSOP-8 footprint leaves board space for a battery holder or energy-harvesting cell.
Recommended
Process Control Front Ends
PLC analog input modules benefit from the ISL267450AIUZ-T's 1 MSPS throughput to digitize up to eight thermocouple or RTD channels through an external mux without aliasing. The 2.5 V internal reference eliminates a separate reference IC, and the SPI interface clocks out 12 bits in 16 SCLK cycles - fast enough for 1 kHz channel switching. Industrial certification at -40 °C to +85 °C supports control cabinet and outdoor installation, while the MSOP-8 package simplifies through-hole field replacement by leaving accessible test pads around the part.
Recommended
Portable Medical Patient Monitors
Wearable patient monitors use the ISL267450AIUZ-T to digitize ECG, SpO2 photodiode, and respiration signals at 1 MSPS with deterministic latency, enabling accurate heart-rate detection and arrhythmia analysis. The 12-bit resolution captures the dynamic range of bioelectric signals while the SPI output reduces microcontroller pin count compared to parallel ADCs. Industrial temperature grading and low power consumption support continuous body-worn operation, and the MSOP-8 footprint allows placement close to the analog front-end for short, noise-immune traces.
Recommended
Energy Harvesting Sensor Nodes
Energy-harvesting nodes in wireless sensor networks rely on the ISL267450AIUZ-T's 1 µA power-down current to operate from tiny harvested charges between transmissions. The 2.7 V minimum supply lets the part run directly from a single lithium-ion or two-cell alkaline supply without boost regulation. With 12 bits at 1 MSPS the converter captures bursty vibration, current, or strain-gauge events with low latency, while its SPI interface shares the same bus as the wireless MCU for compact, single-bus node designs.
Recommended
Industrial Data Acquisition Cards
PCI/PCIe and USB data acquisition cards use the ISL267450AIUZ-T as a single-channel high-speed capture stage ahead of an FPGA or DSP processor. Its 1 MSPS rate supports ultrasonic, vibration, and audio-bandwidth signal recording, while the 12-bit dynamic range offers 72 dB of spurious-free range for spectrum analysis. The 8-pin MSOP simplifies layout under a BNC connector footprint, and the part's wide supply tolerance allows shared 3.3 V or 5 V analog rails common to mixed-signal data-acquisition designs.
Recommended
Recommended Products Summary
Engineering reference data for ISL267450AIUZ-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL267450AIUZ-T7A | ISL267450AIUZ | ISL267440IHZ-T | AD7450ABRMZ |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices |
| Package | MSOP-8 (3.0 x 3.0 mm) | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same |
| Resolution | 12 bits | 12 bits | 12 bits | 10 bits | 12 bits |
| Sample Rate | 1 MSPS | 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 |
| Serial Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE-compatible |
| 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 |
Key Differentiators
- Drop-in pin-compatible with AD7450A (vs AD7450ABRMZ)
- Same MSOP-8 footprint as the 10-bit ISL267440IHZ-T (vs ISL267440IHZ-T)
- 1 µA power-down current extends battery life (vs AD7450ABRMZ)
- Integrated 2.5 V internal reference reduces BOM (vs AD7450ABRMZ)
Design Notes
The ISL267450AIUZ-T draws 4.2 mW at 1 MSPS with a 3 V supply and only 1 µA in power-down. Place a 10 µF bulk and 100 nF decoupling capacitor as close as possible to the AVDD pin; for multi-channel designs, gate power to the ADC with a load switch so the part can sit idle between burst conversions. Estimated: power dissipation at 5 V, 1 MSPS ≈ 9 mW based on datasheet scaling.
Route the analog input trace as a microstrip surrounded by a continuous ground pour on the top layer, and keep the trace length under 25 mm to limit coupling noise. The MSOP-8 thermal pad (if present on the specific package) should be soldered to a star-grounded copper island to keep the die substrate at the same potential as analog GND. Avoid running digital SCLK/SDATA traces parallel to the IN+/IN- traces for more than a few millimeters.
Because this is a 1 MSPS SAR with 12-bit no-missing-codes performance, the front-end amplifier must settle to better than 1/2 LSB (≈305 µV at 2.5 V full-scale) within the 150 ns acquisition window. Use a low-capacitance CMOS-input op amp such as the AD8628 in a unity-gain buffer configuration, and add a 10 pF anti-aliasing RC at the ADC input. Common pitfalls include undersized input RC bandwidth that filters the wanted signal, and using too low a drive strength op amp that fails to settle during acquisition.
Do not leave CS floating: per the Renesas datasheet, an unasserted CS line will allow stray SCLK edges to shift data on SDATA. Also, ensure the digital I/O supply (DVDD) is tied to the same rail as AVDD or a clean 3.3 V source - mixing 5 V logic into the serial lines on a 3 V analog supply violates the absolute maximum ratings. Always assert CS high between conversions to keep the part awake but quiet.
The MSOP-8 has a typical θJA of about 200 °C/W, so thermal shutdown is unlikely in normal use. However, if the part is mounted inside a sealed enclosure with no airflow, derate the AVDD above 4.5 V at sustained 1 MSPS sampling to keep junction rise below 30 °C. Estimated: at 5 V, 1 MSPS in a still-air pocket, junction rise ≈ 8 °C above ambient; this is well within the 125 °C junction maximum.
Compliance Information
RoHS compliance and lead-free status confirmed per Renesas product documentation and distributor listings. AEC-Q100 not applicable - this part is industrial grade, not automotive grade.
