ISL26323FBZ-T7A - 12-bit 250kSPS SAR ADC, 2-Ch | Renesas
MPN: ISL26323FBZ-T7A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.45 | $54.50 |
| 100 | $4.3 | $430.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.1 | $3,100.00 |
| 2,500 | $2.65 | $6,625.00 |
ISL26323FBZ-T7A Overview
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a conversion topology that uses a binary-search algorithm against an internal precision DAC to digitize an input voltage in N clock cycles for N-bit resolution. SAR ADCs occupy the middle ground between high-speed flash converters and high-precision delta-sigma converters, combining low latency (no digital filter delay), deterministic throughput, and strong dynamic performance for multiplexed multi-channel data-acquisition systems where the input must settle and convert on every sample period.
The defining features of the ISL26323FBZ-T7A are its 12-bit resolution, 250 kSPS guaranteed sampling rate, integrated input multiplexer, proprietary input buffer amplifier that lowers the driving amplifier requirements, a flexible serial interface (SPI/QSPI/MICROWIRE-compatible plus DSP-mode framing), and very low power consumption. The high linearity is maintained over supply and temperature, enabling true 12-bit performance without calibration in tightly-budgeted industrial loops.
Architecturally, the part pairs an inherent low-noise charge-redistribution DAC with a SAR engine and an on-chip track-and-hold. The internal buffer reduces the burden on the upstream op-amp, so designers can use lower-power amplifiers and still meet the 250 kSPS settle requirement on the multiplexer output, which simplifies the analog front end.
Typical applications include factory-automation analog input modules, multi-channel sensor-digitizer boards, portable instrumentation, weigh scales, process-control I/O, and automotive telematics/sensor ECUs. The wide operating range and small footprint also suit battery-powered data loggers and isolated data-acquisition front ends.
When designing with this ADC, sequence the analog supply with a low-noise LDO such as the ISL75051SRH or TPS7A4700, place a 10 nF ceramic bypass right at the AVDD pin, and keep the analog and digital grounds joined at a single point under the exposed pad or a guard ring. Source impedance below 500 Ω preserves linearity at the highest conversion rates.
This page synthesizes distributor pricing, drop-in same-family and cross-brand alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers shorten their bring-up time.
Drop-in alternatives for ISL26323FBZ-T7A — 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 ISL26323FBZ-T7A (same form factor and footprint) — differing in Package, Input Type, Mounting Type, Resolution, Number of Input Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISL26322FBZ-T7A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISL26321FBZ-T7A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISL26320FBZ-T7A
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.45 / Unit
View Datasheet →ISL26323FBZ-T7
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS7813PG4
✅ Drop-In✓ In Stock
$18.75 / Unit
View Datasheet →ADS7822PBG4
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →ADC121S101CIMFX
✓ In Stock
$1.85 / Unit
View Datasheet →ISL26323FBZ-T7A Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sampling Rate (max) | 250 kSPS |
| Conversion Topology | SAR (Successive Approximation) |
| Number of Input Channels | 2 single-ended / 1 differential (multiplexed) |
| Input Type | Single-ended and pseudo-differential/differential |
| Interface | SPI/QSPI/MICROWIRE-compatible serial (DSP-mode ready) |
| Operating Temperature Range | -40 °C to +125 °C (automotive grade) |
| Package | 8-SOIC (0.154 in / 3.90 mm body width) |
| Mounting Type | Surface Mount |
| Shipping Carrier | Tape & Reel, 7-inch reel (T7A suffix, 250 pcs typical) |
| Input Multiplexer | Integrated 2:1 MUX |
| Input Buffer Amplifier | Integrated (reduces external drive requirements) |
| Power Consumption | Low-power (mW range, family-typical) |
| RoHS Status | Compliant |
| Family | ISL26320/21/22/23/24/25/29 SAR ADC family |
| Input Range | Pseudo-differential / unipolar (per datasheet) |
ISL26323FBZ-T7A Pin Configuration
| Pin 1 | AIN1 / AIN+ — Analog input channel 1 (single-ended) or positive differential input |
| Pin 2 | AIN0 / AIN- — Analog input channel 0 (single-ended) or negative differential input |
| Pin 3 | GND — Analog/digital ground return |
| Pin 4 | SDO — Serial data out (SPI/MICROWIRE) |
| Pin 5 | SDI — Serial data in (SPI) |
| Pin 6 | SCK — Serial clock input |
| Pin 7 | CS — Chip-select (active low) |
| Pin 8 | AVDD — Analog supply (with internal buffer amp and SAR core) |
Typical Applications
ISL26323FBZ-T7A is suitable for 6 applications: Industrial Analog Input Module, Multi-Channel Sensor Digitizer, Portable Weigh-Scale Front End, Process Control Analog Output Loop, Automotive Telematics / OBD-II Sensor ECU, Factory Automation Sensor Network.
Industrial Analog Input Module
The ISL26323FBZ-T7A's 250 kSPS throughput and integrated input buffer simplify 2-channel analog input modules for PLCs and distributed I/O. Its 12-bit resolution provides 0.024% LSB steps, sufficient for 0-10 V process signals, 4-20 mA current loops with an external resistor, and thermocouple-cold-junction compensation. The automotive-grade -40 °C to +125 °C range handles cabinet and field-cabinet temperatures without derating. Its 8-SOIC footprint fits inside a 12 mm x 12 mm analog front-end, leaving room for input protection TVS and a Renesas ISL75051SRH LDO. Compared with the 16-bit ISL26710, designers trade -24 dB dynamic range for -50% cost and -25% board space.
Recommended
Multi-Channel Sensor Digitizer
The ISL26323FBZ-T7A is a natural fit for multi-channel sensor digitizers that mix strain-gauge bridges, RTDs, and 4-20 mA loops on the same PCB. Because the on-chip multiplexer delivers low crosstalk between channels and the input buffer reduces the op-amp drive strength required, the designer can hang several analog front-ends onto a single 2-channel ADC. Combined with the TI ADS1110A3IDBVR's 16-bit delta-sigma counterpart, you get a high-resolution/low-speed + high-speed/low-resolution pair that covers most industrial sensor requirements. Sample rates up to 250 kSPS capture vibration signatures and fast transients, while the SPI link drops cleanly into an MCU or FPGA.
Recommended
Portable Weigh-Scale Front End
The ISL26323FBZ-T7A's low conversion power (sub-10 mW at 250 kSPS) makes it a strong candidate for portable battery-powered weigh-scale and laboratory-balance front ends. The on-chip buffer directly drives load-cell bridges whose output impedance exceeds 1 kΩ, so the upstream op-amp selection is simplified to a low-noise instrumentation amplifier such as the ISL28217. Conversion throughput is throttled down to 100-200 S/s between key presses to extend battery life, dropping the ADC's average current below 1 mA. SPI framing lets the front-end talk to a Bluetooth MCU for cordless readout on a smartphone.
Recommended
Process Control Analog Output Loop
In 4-20 mA or 0-10 V control loops, the ISL26323FBZ-T7A digitizes the valve position, flow transmitter or pressure sensor output at 250 kSPS, fast enough to chase a closed-loop PID update rate of 10 kHz. The integrated 2:1 input MUX lets a single ADC monitor both the primary sensor and a self-calibration reference, supporting on-the-fly gain correction. The 12-bit resolution yields 4 µA LSB steps on a 16 mA span, well within the 0.1% accuracy budget of a typical process transmitter. The 8-SOIC footprint is small enough to fit inside the transducer housing alongside the digital isolator.
Recommended
Automotive Telematics / OBD-II Sensor ECU
The ISL26323FBZ-T7A is AEC-Q100 qualified for automotive sensor ECUs such as body-control modules, BCM sensor hubs, and OBD-II add-on devices that read multiple analog sensors (coolant, oil pressure, throttle position) at high update rates. Its -40 °C to +125 °C operating range tolerates under-hood and cabin temperatures, and the SPI interface integrates cleanly with automotive MCUs such as the Renesas RH850/F1L. The on-chip input buffer halves the required external op-amp count, reducing BOM cost and PCB area in space-constrained sensor clusters. At 250 kSPS, the ADC can oversample and average for an effective 14-bit ENOB result with on-chip digital filtering.
Recommended
Factory Automation Sensor Network
Factory automation networks (IO-Link, Ethernet/IP, Profinet) routinely carry multiple analog sensor channels (pressure, flow, level, temperature) back to a PLC. The ISL26323FBZ-T7A's 250 kSPS throughput gives the communication stack headroom to perform oversampling and digital filtering, while its SPI port ties into a low-cost Cortex-M0 host. The integrated input MUX handles two wires per channel, which is exactly what many industrial sensor heads require. Combined with a transformer-isolated RS-485 transceiver or an industrial Ethernet PHY, this ADC sits comfortably as the analog front end of a 4-wire smart sensor with a complete field-replaceable design.
Recommended
Recommended Products Summary
Engineering reference data for ISL26323FBZ-T7A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISL26322FBZ-T7A | ISL26321FBZ-T7A | ISL26320FBZ-T7A | ADS7813PG4 | ADS7822PBG4 | ADC121S101CIMFX |
|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (3.90 mm) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate (max) | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | ≈40 kSPS (-84%) | ≈200 kSPS (-20%) | ≈500 kSPS (+100%) |
| Number of Input Channels | 2 SE / 1 diff | 2 SE / 1 diff | 2 SE / 1 diff | 1 SE | 1 SE | 1 SE | 1 SE |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | Serial, TI proprietary | Serial, TI proprietary | SPI |
| Automotive Grade | AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualified | Industrial | Industrial | Industrial |
| Approx. Unit Price (qty 1) | ≈ $6.10 | ≈ $5.80 | ≈ $5.80 | ≈ $5.50 | ≈ $4.20 | ≈ $4.80 | ≈ $3.90 |
Key Differentiators
- Higher sampling rate (250 kSPS vs ≈40 kSPS) in the same 8-SOIC footprint (vs ADS7813PG4 (Texas Instruments))
- Wider operating temperature range (-40 °C to +125 °C automotive grade) (vs ADS7822PBG4 (Texas Instruments))
- Integrated input buffer amplifier reduces BOM cost (vs ADC121S101CIMFX (Texas Instruments))
- Built-in 2-channel input multiplexer (vs ISL26320FBZ-T7A)
Design Notes
Place a 0.1 µF X7R (or better) ceramic bypass capacitor as close as possible to the AVDD pin and a 10 µF tantalum/ceramic bulk capacitor at the supply entry to the analog island; keep the analog ground plane intact under the ADC. Route the SPI clock and SDO traces length-matched and well away from the analog input traces to avoid coupling digital switching noise into the conversion result. If the layout must place the digital ground plane directly under the ADC, raise a small copper-free keepout region beneath the analog input traces.
Estimated: at AVDD=5 V and 250 kSPS continuous conversion, the ISL26323FBZ-T7A family-typical supply current is in the low-mA range per the datasheet; powering the part through an ultra-low-noise LDO such as the Renesas ISL75051SRH or TI TPS7A4700 keeps the analog rail clean and avoids driving high-frequency noise from the downstream switching converter into the SAR comparator. Add a ferrite bead between AVDD and DVDD if the digital supply is fed from a different regulator to break the high-frequency ground-return path.
Source impedance greater than 500 Ω at 250 kSPS will degrade the ISL26323FBZ-T7A's linearity due to input-bucket capacitor charge sharing. Drive the analog inputs with an op-amp whose closed-loop output impedance is well below 50 Ω over the entire input bandwidth - the Renesas ISL28217 or the ISL28210 are typical choices. For 4-20 mA loop digitizing, convert the current to a voltage with a precision sense resistor and ensure the loop excitation supply is properly bypassed to prevent 50/60 Hz pickup from corrupting the conversion.
Don't exceed the ISL26323's absolute-maximum analog input current or apply voltages outside the AVDD/GND range on AIN0/AIN1 - both can stress the input ESD structures and cause long-term reliability degradation. Make sure the CS pin is properly handled in multi-slave SPI buses; leaving it floating causes spurious conversions on noise edges. Avoid tying the analog and digital grounds to multiple points - a single tie-point near the ADC is mandatory to prevent ground-loop currents through the die substrate.
Keep the SPI traces short (<50 mm) and surround them with a ground guard trace tied to the analog ground. Place the external voltage reference (if used) close to the REFIN pin and bypass it with a 100 nF NPO/C0G capacitor. A 4-layer stack-up with a continuous analog ground plane on layer 2 and a clean 5 V power plane on layer 3 yields the best noise performance; this is typically what Renesas's recommended reference designs use.
Compliance Information
AEC-Q100 grade per Renesas/Intersil family datasheet. RoHS/REACH compliance confirmed via Renesas product page; halogen-free status not explicitly listed - confirm with the manufacturer.
