ISL26312FVZ - 12-bit 125kSPS 2-ch Diff SAR ADC | Renesas
MPN: ISL26312FVZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 10 | $3.68 | $36.80 |
| 100 | $3.1 | $310.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.05 | $2,050.00 |
ISL26312FVZ Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm and a precision internal DAC to converge on the input voltage in one conversion cycle per bit. SAR ADCs sit in the broader category hierarchy of data converter -> ADC -> successive-approximation ADC -> precision data acquisition IC, and are typically chosen over delta-sigma converters when low latency (no pipeline delay), wide input bandwidth, and true-differential inputs are required in industrial control and instrumentation front ends.
Key features include excellent linearity over supply and temperature, an input multiplexer combined with a low-drive buffer amplifier that relaxes external driver requirements, and a proprietary input MUX that supports 1-, 2-, 4-, and 8-channel single-ended configurations as well as 1-, 2-, and 4-channel differential configurations across the family. Typical INL/DNL is better than 1 LSB and the device draws only a few mW at full throughput, making it suitable for battery-powered monitoring.
Typical applications include industrial process control loop measurement, multi-channel sensor data acquisition (temperature, pressure, strain gauges), battery monitoring and management systems, motor-control feedback, and instrumentation front-ends that require low-latency differential conversion. Designers appreciate the combination of small TSSOP footprint, simple SPI interface, and high DC accuracy.
When designing with this device, place the analog and digital ground planes with proper partitioning and keep the REFIN decoupling capacitor as close to the pin as possible to maintain DC accuracy. Use a low-impedance input buffer when driving the AIN pins from high-impedance sensors.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives within the ISL2631x family, and practical design notes that complement the manufacturer datasheet for fast design-in decisions.
Drop-in alternatives for ISL26312FVZ — 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 ISL26312FVZ (same form factor and footprint) — differing in Resolution, RoHS Status, ADC Architecture, Input Configuration, Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26310FVZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26311FVZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26313FVZ
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26314FVZ
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →ISL26312FVZ-T7A
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →ISL26312FVZ Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 125 kSPS |
| Number of Channels | 2 differential inputs |
| Input Configuration | Single-ended or true differential |
| ADC Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Digital I/O Supply (DVDD) | 1.8 V to AVDD |
| Interface | SPI-compatible, daisy-chain capable |
| Package | 16-pin TSSOP |
| Power Consumption | Low-power SAR architecture |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ISL26312FVZ Pin Configuration
| Pin 1 | AIN0+ — Differential analog input 0, positive |
| Pin 2 | AIN0- — Differential analog input 0, negative |
| Pin 3 | AGND — Analog ground |
| Pin 4 | REF — Voltage reference input/output |
| Pin 5 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 6 | DGND — Digital ground |
| Pin 7 | DVDD — Digital I/O supply (1.8 V to AVDD) |
| Pin 8 | CS — Chip select (active low) for SPI interface |
| Pin 9 | SCLK — SPI serial clock input |
| Pin 10 | SDI — SPI serial data input |
| Pin 11 | SDO — SPI serial data output |
| Pin 12 | AIN1+ — Differential analog input 1, positive |
| Pin 13 | AIN1- — Differential analog input 1, negative |
| Pin 14 | AGND — Analog ground |
| Pin 15 | DGND — Digital ground |
| Pin 16 | DVDD — Digital I/O supply |
Typical Applications
ISL26312FVZ is suitable for 6 applications: Industrial Process Control, Multi-Channel Sensor Data Acquisition, Battery Monitoring and Management, Motor Control Feedback, Precision Instrumentation Front-End, Portable Medical Devices.
Industrial Process Control
The ISL26312FVZ's 12-bit resolution at 125 kSPS and dual true-differential inputs make it ideal for industrial process control loops where 4-20 mA or 0-10 V transducer signals must be digitized with low latency and excellent common-mode rejection. Each differential channel rejects industrial ground noise and switch-mode ripple, while the SPI interface simplifies isolation barrier implementation. Power consumption in the low-mW range allows deployment in DIN-rail and remote I/O modules without complex thermal design.
Recommended
Multi-Channel Sensor Data Acquisition
For multi-sensor data acquisition boards, the ISL26312FVZ provides 2 differential channels with an integrated input multiplexer and buffer amplifier that reduces external driver requirements. Sensor front-ends such as strain gauges, thermocouple amplifiers, and pressure transducers connect directly without instrumentation-grade op-amps, simplifying BOM and saving PCB area. The 125 kSPS throughput supports simultaneous sampling of dynamic sensors while 12-bit resolution satisfies most industrial control and predictive maintenance applications.
Recommended
Battery Monitoring and Management
In battery management systems (BMS), the ISL26312FVZ digitizes cell voltages and pack currents with true-differential inputs that reject ground shift between the high-side battery rail and the low-side control MCU. The low operating voltage range of 2.7 V to 5.25 V matches 3.3 V system rails, and the SPI interface connects to host microcontrollers for state-of-charge computation. Low quiescent current and small TSSOP-16 footprint suit portable and electric-vehicle 12 V/48 V battery packs where board area is constrained.
Recommended
Motor Control Feedback
Motor control systems require low-latency current and voltage feedback, and the ISL26312FVZ delivers SAR-class conversion with no pipeline delay at 125 kSPS. Two differential channels can digitize phase current and DC-bus voltage simultaneously, feeding FOC or trapezoidal commutation algorithms in real time. The differential input rejects common-mode switching noise from the inverter stage, and the SPI daisy-chain feature allows multiple ISL26312FVZ parts to be addressed from a single MCU SPI peripheral.
Recommended
Precision Instrumentation Front-End
Test-and-measurement instruments benefit from the ISL26312FVZ's true-differential inputs and SAR architecture, which provide wide input bandwidth and immediate conversion results without the latency of delta-sigma modulators. The 2-channel differential configuration supports bridge sensors, weigh scales, and laboratory data loggers where DC accuracy and channel-to-channel matching matter. Integrated input buffering further simplifies the analog front-end, reducing component count and calibration complexity in precision instrumentation.
Recommended
Portable Medical Devices
Patient monitors and portable diagnostic equipment require low-power, accurate ADCs in compact footprints, and the ISL26312FVZ delivers 12-bit resolution at low mW dissipation in a TSSOP-16 package. Differential inputs digitize biopotential signals (ECG/EMG) with good common-mode rejection of mains interference, while the SPI interface connects to low-power MCUs running real-time DSP. The 2.7 V minimum supply supports single-cell Li-ion operation, enabling battery-powered patient wearables and bedside monitors.
Recommended
Recommended Products Summary
Engineering reference data for ISL26312FVZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26310FVZ | ISL26313FVZ | ISL26314FVZ | ISL26312FVZ-T7A |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | TSSOP-16 | TSSOP-16 (same) | TSSOP-16 (same) | TSSOP-16 (same) | TSSOP-16 (same) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS |
| Number of Channels | 2 differential | 1 differential | 4 differential | 8 single-ended | 2 differential |
| Analog Supply | 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 I/O Supply | 1.8 V to AVDD | 1.8 V to AVDD | 1.8 V to AVDD | 1.8 V to AVDD | 1.8 V to AVDD |
| Interface | SPI, daisy-chain | SPI, daisy-chain | SPI, daisy-chain | SPI, daisy-chain | SPI, daisy-chain |
| Packaging Format | Tube | Tube | Tube | Tube | Tape & Reel (7") |
Key Differentiators
- True differential dual inputs in TSSOP-16 (vs ISL26310FVZ)
- Lower channel count than 4/8-channel variants (vs ISL26313FVZ)
- Family pin-compatibility for future scaling (vs ISL26312FVZ-T7A)
Design Notes
Partition the PCB into analog and digital ground planes joined at a single point beneath the AGND pin to minimize switching noise coupling into the SAR comparator. Place the REF decoupling capacitor (typically 10 uF ceramic in parallel with 0.1 uF) within 2 mm of the REF pin, and route AVDD traces with wide copper to reduce IR drop. Keep the SCLK trace short and surround it with ground to limit radiated digital noise into the analog front-end.
AVDD should be sourced from a low-noise LDO rather than a switching regulator to preserve the ADC's INL/DNL. DVDD can share a switching regulator if a ferrite bead and 10 uF + 0.1 uF decoupling network isolate the supply. Estimated: at 125 kSPS continuous conversion the ISL26312FVZ draws single-digit mA; a 100 mA LDO provides >10x headroom for transient response.
Drive the AIN+ and AIN- pins with matched source impedances to maximize common-mode rejection. If the sensor is single-ended, bias the negative input to mid-supply (e.g. AVDD/2) using a low-impedance buffer. The integrated input buffer amplifier simplifies driving but still benefits from RC anti-aliasing on the front-end to limit broadband noise folding into the SAR sampling capacitor.
Do not exceed AVDD = 5.25 V or DVDD > AVDD as defined in the datasheet absolute maximum ratings. Avoid floating the CS pin - it must be driven low to enable the SPI interface. When using daisy-chain mode, verify the SDO-to-SDI timing budget across the cascade of devices to avoid setup/hold violations at the maximum SCLK rate.
Compliance Information
RoHS and REACH compliance per Renesas product page. Not AEC-Q100 qualified - this part targets industrial and consumer applications, not automotive.