ISL26314FVZ - 12-bit 125kSPS 4-CH Differential SAR ADC | Renesas
MPN: ISL26314FVZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.72 | $5.72 |
| 10 | $5.15 | $51.50 |
| 100 | $4.3 | $430.00 |
| 500 | $3.85 | $1,925.00 |
| 1,000 | $3.55 | $3,550.00 |
ISL26314FVZ Overview
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a sampling ADC architecture that performs one bit-trial per clock cycle using a binary search across an internal capacitive DAC. SAR ADCs are valued for deterministic latency (one conversion = N clock cycles), zero pipeline delay, excellent DC linearity, and low power consumption - they sit in the IC hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. SAR converters are preferred over delta-sigma converters for multiplexed multi-channel sampling where per-channel latency must be deterministic, and over pipeline ADCs when power and simplicity matter more than very high sample rates.
Key features include 4 differential inputs (expandable to 8 single-ended via software), 125 kSPS maximum throughput, ±1 LSB INL (typical), a proprietary input multiplexer with integrated buffer amplifier that reduces external drive requirements, and a wide operating temperature range of -40°C to +125°C. The device also integrates an internal 2.5 V reference (10 ppm/°C typical), an SPI/QSPI/MICROWIRE-compatible serial interface, and a hardware / software shutdown pin that reduces supply current to under 1 µA between conversions.
The ISL26314 is implemented on a low-power CMOS process. An internal charge redistribution DAC combined with the proprietary input multiplexer allows direct connection of high-impedance sensors without external instrumentation amplifiers, simplifying the analog front end. The part is part of a broader pin-compatible family (ISL26310/11/12/13/14/15/19) offering 1, 2, 4, and 8 single-ended and 1, 2, 4 differential channel counts - enabling one PCB layout to scale across product variants.
Typical applications include industrial process control, 4-20 mA loop digitization, multi-cell battery monitoring, programmable logic controller (PLC) analog input modules, weigh scales, and temperature measurement front-ends (RTD/thermocouple with external amplifier).
When designing with this part, note that the input buffer lowers kick-back current into high-source-impedance sensors, but adding an RC anti-alias filter ahead of the input requires careful selection to avoid degrading settling at 125 kSPS. Use the SHDN pin to drop idle channels to microamp-level quiescent current in battery-powered multi-channel systems.
This page synthesizes distributor pricing, same-family pin-compatible drop-in alternatives, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ISL26314FVZ — 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 ISL26314FVZ (same form factor and footprint) — differing in Input Type, Number of Input Channels, Package, Interface, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26314FVZ-T7A
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26314FVZ-T
✅ Drop-In✓ In Stock
$3.31 / Unit
View Datasheet →ISL26312FVZ-T
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →ISL26311FBZ
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ISL26313FBZ-T7A
✅ Drop-In📋 Reference alternative (not in catalog)
ISL26314FVZ Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Sample Rate | 125 kSPS |
| Number of Channels | 4 differential (8 single-ended via mux) |
| ADC Architecture | SAR (Successive Approximation) |
| Input Type | Single-ended / Differential (software-selectable) |
| Analog Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 1.8 V to 3.6 V |
| Supply Current (Full Speed) | 6.4 mW (typical at 3 V) |
| Shutdown Current | < 1 µA |
| Internal Reference | 2.5 V (10 ppm/°C typical) |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Operating Temperature | -40 °C to +125 °C |
| Package | 16-pin TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant (per digchip.com) |
| Lead Free Status | Lead Free (per digchip.com) |
ISL26314FVZ Pin Configuration
| Pin 1 | AIN0+ — Differential analog input 0, positive |
| Pin 2 | AIN0- — Differential analog input 0, negative |
| Pin 3 | AIN1+ — Differential analog input 1, positive |
| Pin 4 | AIN1- — Differential analog input 1, negative |
| Pin 5 | GND — Ground |
| Pin 6 | REF — Reference voltage input/output (2.5 V internal) |
| Pin 7 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 8 | DVDD — Digital supply voltage (1.8 V to 3.6 V) |
| Pin 9 | GND — Digital ground |
| Pin 10 | CS — Chip select (active low) |
| Pin 11 | SCLK — Serial clock input |
| Pin 12 | SDI — Serial data input (MOSI) |
| Pin 13 | SDO — Serial data output (MISO) |
| Pin 14 | SHDN — Shutdown input (active low) |
| Pin 15 | AIN2+/AIN3+ — Differential analog inputs 2/3 positive (per family datasheet mux) |
| Pin 16 | AIN2-/AIN3- — Differential analog inputs 2/3 negative (per family datasheet mux) |
Typical Applications
ISL26314FVZ is suitable for 7 applications: Industrial Process Control / 4-20 mA Loop Digitization, Multi-Cell Battery Monitoring (BMS), PLC Analog Input Module, Weigh Scale / Bridge Sensor Digitization, Temperature Measurement Front-End (RTD / Thermocouple), Data Acquisition Module / DAS Front-End, Portable / Battery-Powered Instrumentation.
Industrial Process Control / 4-20 mA Loop Digitization
The ISL26314FVZ's 4 differential input channels and 12-bit 125 kSPS throughput make it well-suited to multi-channel industrial process-control digitizers where each differential pair rejects common-mode noise from long sensor cables. Differential inputs handle ±VREF±5 V common-mode signals directly, eliminating the need for an external instrumentation amplifier in many 4-20 mA loop circuits; the integrated 2.5 V reference and buffer amplifier reduce external BOM count. Compared to delta-sigma ADCs, SAR architecture gives deterministic per-channel latency, which matters when the controller runs a multiplexed control loop at fixed update rate.
Recommended
Multi-Cell Battery Monitoring (BMS)
The ISL26314FVZ enables monitoring of up to 4 battery cells (8 cells with software mux pairing) in a battery management system. Differential inputs handle the high common-mode voltage seen when stacked cells share a series string, while the <1 µA shutdown current between conversions extends idle time on battery-powered packs. With 12-bit resolution, the ADC resolves cell voltages to about 1 mV per LSB at typical Li-ion 4.2 V levels, sufficient for coulomb counting and over-voltage/under-voltage protection. SPI/QSPI-compatible serial interface glues directly to common BMS microcontrollers.
Recommended
PLC Analog Input Module
The ISL26314FVZ packs 4 differential channels into a 16-pin TSSOP, allowing a compact 4-channel analog input slice on a PLC backplane. Its 2.7-5.25 V analog and 1.8-3.6 V digital supplies accept the common 24 V -> 5 V/3.3 V PLC rails directly, simplifying power tree design. SPI interface drops onto an isolated SPI barrier (digital isolator) for high-voltage isolation to the PLC CPU. The -40 °C to +125 °C operating range matches industrial control cabinet thermal environments.
Recommended
Weigh Scale / Bridge Sensor Digitization
The ISL26314FVZ's 4 differential inputs accept Wheatstone bridge load-cell outputs directly. Differential signaling rejects 50/60 Hz line noise injected into long cable runs from the scale platform to the indicator. The integrated input buffer lowers kick-back current into the high-impedance bridge, reducing settling time at constant conversion rates and eliminating the external instrumentation amp that bridge digitizers usually require. 12-bit resolution supports commercial weighing scale precision (typically 0.1% FS).
Recommended
Temperature Measurement Front-End (RTD / Thermocouple)
The ISL26314FVZ with external gain stage digitizes RTD or thermocouple signals using its differential inputs. Differential topology rejects ground-loop noise between the sensor and the digitizer, critical for thermocouple measurements where the junction sits at a different ground than the controller. The internal 2.5 V reference can be replaced with an external precision reference for higher absolute accuracy. SPI interface is software-compatible with most microcontroller-based temperature transmitters.
Recommended
Data Acquisition Module / DAS Front-End
The ISL26314FVZ forms the analog front-end of a multi-channel data acquisition system, pairing 4 differential inputs at 125 kSPS aggregate throughput with deterministic SAR latency. The proprietary input multiplexer/buffer amplifier reduces external drive requirements, allowing direct connection to high-impedance sensors without external amplifiers. SPI interface supports multi-ADC daisy-chaining on a single SPI bus - useful when more than 4 channels are needed by stacking multiple ISL26314FVZ devices per CS line.
Recommended
Portable / Battery-Powered Instrumentation
The ISL26314FVZ's 6.4 mW typical power at 3 V and <1 µA shutdown current suit portable handheld instruments. Using the SHDN pin, idle channels drop to microamp-level quiescent current, allowing field instruments to log sensor data over extended battery life. Single 3.3 V operation (AVDD=DVDD) minimizes the power tree. The 16-pin TSSOP is small enough for compact handheld enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ISL26314FVZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26314FVZ-T7A | ISL26314FVZ-T | ISL26312FVZ-T | ISL26311FBZ | ISL26313FBZ-T7A |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 16-pin TSSOP | 16-pin TSSOP (same) | 16-pin TSSOP (same) | 16-pin TSSOP (same) | 16-pin SOIC (16-pin SMT, slightly different footprint) | 16-pin SOIC (16-pin SMT, slightly different footprint) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS | 125 kSPS |
| Channel Count (Differential) | 4 differential | 4 differential | 4 differential | 2 differential (-50%) | 1 differential (-75%) | 4 single-ended (0 differential) |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Packaging Form | Tube | Tape & Reel (7-inch) | Tape & Reel | Tape & Reel | Tube | Tape & Reel (7-inch) |
Key Differentiators
- Highest channel count in same-family pin-compatible family (vs ISL26312FVZ-T)
- Differential input topology vs single-ended only (vs ISL26313FBZ-T7A)
- Integrated input buffer reduces external drive requirements (vs External instrumentation amp + ADC)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the AVDD pin (pin 7) and another to DVDD (pin 8), plus a 10 µF bulk capacitor on AVDD within 10 mm. Reference pin (pin 6) requires a 0.1 µF + 10 µF decoupling pair to stabilize the internal 2.5 V reference. Use a ground plane on layer 2 to provide low-impedance return paths for the analog inputs; route AVDD/DVDD/REF traces over this plane and avoid routing digital signals (SCLK, SDO) directly over the analog section. Per the ISL26310-26319 family datasheet layout guidance, separate analog and digital ground domains at a single point near the IC to avoid digital switching noise coupling into analog inputs.
Differential input traces (AIN0+/AIN0- through AIN3+/AIN3-) must be routed as a matched-length, balanced pair with constant spacing to preserve common-mode rejection ratio. Keep input traces away from SCLK and SDO digital traces to avoid capacitive coupling; if the layout forces crossings, route at 90 degrees. Place an RC low-pass anti-alias filter ahead of each differential input - typical values are 100 Ω series + 330 pF to ground on each input, giving a ~4.8 MHz cutoff well above the 125 kSPS Nyquist. The proprietary input buffer lowers kick-back current into high-source-impedance sensors, but the external RC must settle within one conversion cycle (8 µs at 125 kSPS) to avoid gain error.
AVDD accepts 2.7 V to 5.25 V and DVDD accepts 1.8 V to 3.6 V. In single-rail 3.3 V systems, AVDD and DVDD may be tied together; per the family datasheet, AVDD must remain within the spec range even during line transients. For noise-sensitive applications, use an LDO (e.g., TPS7A4701) on AVDD instead of a switching regulator to avoid injecting switching noise into the analog supply. The SHDN pin (active low) drops quiescent current to <1 µA when not converting - useful for battery-powered multi-channel systems where the ADC is duty-cycled.
Do not exceed the absolute maximum analog input voltage of AVDD + 0.3 V on any AIN pin - even during fault conditions - or the input ESD diodes will forward-conduct and inject current into the analog supply. Use external TVS diodes or current-limit resistors if the input can exceed this. The internal reference is shared across all input channels; if your application ratiometrically measures against AVDD, configure the ADC for external-reference mode and tie REF to AVDD. The CS pin must be toggled low at the start of each conversion cycle - leaving CS continuously low in SPI mode can cause bus contention in multi-device configurations.
Compliance Information
RoHS compliant and lead-free per digchip.com datasheet entry. AEC-Q100 not applicable - this is a general industrial/commercial part, not automotive-grade.