ISL26311FBZ-T7A - 12-bit 125kSPS SAR ADC, 1-Ch Diff | Renesas
N.º da peça: ISL26311FBZ-T7A ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.85 | $4,85 |
| 10 | $4.32 | $43,20 |
| 100 | $3.78 | $378,00 |
| 500 | $3.3 | $1.650,00 |
| 1.000 | $2.9 | $2.900,00 |
ISL26311FBZ-T7A Visão geral
A SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm to digitize an analog input, trading resolution for speed. SAR converters sit within the broader ADC family (alongside delta-sigma, pipeline, and flash ADCs) and are widely preferred in multiplexed data-acquisition systems, industrial control loops, and portable instrumentation where deterministic latency, low power, and small package size are required. The ISL26311 belongs to the ISL26310/11/12/13/14/15/19 pin-compatible SAR ADC family from Renesas, which lets designers reuse one PCB footprint across multiple channel-count variants.
Key features of the ISL26311FBZ-T7A include 12-bit resolution (no missing codes), true differential analog inputs for high common-mode rejection, integrated low-drift reference buffer support, and a 1-/8-pin SOIC footprint that simplifies layout in space-constrained designs. The low-power architecture targets 125 kSPS throughput at sub-mW conversion rates while preserving excellent AC and DC linearity for precision sensor read-back. The single-channel input simplifies firmware and routing when only one precision voltage must be measured.
Typical applications for the ISL26311FBZ-T7A include industrial process control, isolated sensor front-ends, multichannel data-acquisition systems where it is paired with multiplexers, battery management monitoring, and portable medical instrumentation. The differential input allows direct connection to bridge sensors such as load cells and strain gauges without an external instrumentation amplifier, reducing board area and cost.
When designing with this ADC, ensure the analog supply is well decoupled with a 10 uF bulk plus 0.1 uF ceramic placed as close as possible to the AVDD pin. Reference decoupling on the REF pin is critical to achieving rated noise performance. The digital lines should be kept short and routed away from the analog input to minimize coupling.
This page synthesizes distributor pricing, the ISL2631x pin-compatible family, and practical design notes that are not collated in the manufacturer datasheet.
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Solicitar alternativasISL26311FBZ-T7A Classificações máximas e características elétricas
| Resolução | 12 bit |
| Sample Rate | 125 kSPS |
| ADC Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 differential |
| Input Configuration | Single-ended and differential (per family datasheet) |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Interface | SPI / serial-compatible |
| Encapsulamento | 8-pin SOIC-N |
| Tipo de montagem | Surface Mount |
| Reference Type | External reference |
| Status RoHS | Compliant (per manufacturer product page) |
| Packaging | Tape & Reel, 7-inch (T7A suffix per JEDEC EIA-481) |
Configuração de pinos do ISL26311FBZ-T7A
| Pino 1 | AIN+ — Positive analog input (differential) |
| Pino 2 | AIN- — Negative analog input (differential) |
| Pino 3 | GND — Analog ground |
| Pino 4 | REF — External reference voltage input |
| Pino 5 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| Pino 6 | CS — Chip select (active low) |
| Pino 7 | SCLK — Serial clock input |
| Pino 8 | SDOUT — Serial data output |
Aplicações típicas
ISL26311FBZ-T7A é adequado para 7 aplicaçãos: Industrial Process Control, Bridge Sensor / Load Cell Readout, Battery Management Monitoring, Portable Medical Instrumentation, Multichannel Data Acquisition Systems, Isolated Sensor Front-End, General Purpose Precision Measurement.
Industrial Process Control
The ISL26311FBZ-T7A fits industrial process control loops where a single precision voltage must be digitized at moderate speed with deterministic latency. Its 12-bit, 125 kSPS SAR architecture provides one conversion in 8 microseconds, which is fast enough for 4-20 mA loop transmitters, PLC analog input modules, and valve position readback. The differential input rejects common-mode noise from long sensor cables, a critical concern in factory-floor installations. The 2.7 V to 5.25 V analog supply aligns with 3.3 V and 5 V industrial backplanes, eliminating the need for additional level shifters. Compared with 24-bit sigma-delta converters, the ISL26311FBZ-T7A is preferred when latency and step response matter more than absolute resolution. Its 8-pin SOIC footprint allows it to fit in compact field-mount transmitter heads.
Recomendado
Bridge Sensor / Load Cell Readout
The ISL26311FBZ-T7A is well matched to bridge sensor readouts such as load cells, strain gauges, and pressure transducers. Its differential input accepts the bridge output directly, while the 12-bit resolution delivers 0.024 percent full-scale accuracy, suitable for weighing scales and force measurement. Designers can place the ISL26311FBZ-T7A right next to the bridge, take advantage of common-mode rejection, and route a clean digital SPI trace back to a microcontroller. At 125 kSPS the part can oversample a slowly varying load cell signal and apply digital averaging to push effective resolution beyond 12 bits. The 8-pin SOIC package keeps the analog front-end compact, which is essential for handheld and bench-scale instruments where PCB real estate is at a premium.
Recomendado
Battery Management Monitoring
The ISL26311FBZ-T7A serves battery management systems that require precise per-cell voltage and current monitoring in a small footprint. Its 12-bit resolution and 125 kSPS sample rate are sufficient for cell voltage telemetry, current shunt readback, and temperature channel scanning through an external multiplexer. The low-power SAR architecture draws modest current during conversion, extending runtime in portable battery-powered designs. The differential input can directly digitize the voltage across a current-sense resistor, eliminating external instrumentation amplifiers. The 2.7 V to 5.25 V supply range accommodates 1S to 4S Li-ion packs when paired with a resistive divider, while the 8-pin SOIC package fits inside a battery management daughter board.
Recomendado
Portable Medical Instrumentation
The ISL26311FBZ-T7A is a strong fit for portable medical instrumentation such as pulse oximeters, glucose meters, and handheld patient monitors. Its 12-bit, 125 kSPS throughput is sufficient for photoplethysmography (PPG) waveform digitization, where the optical sensor output bandwidth is below 100 Hz and the SAR's deterministic latency eliminates group-delay distortion. The differential input simplifies connection to the photodiode transimpedance amplifier output, and the 2.7 V to 5.25 V supply range matches single-cell Li-ion operation with a boost regulator. The 8-pin SOIC package occupies minimal board space in pen-style or wrist-worn devices. Compared to higher-resolution delta-sigma converters, the ISL26311FBZ-T7A offers lower power at moderate speeds, extending battery life.
Recomendado
Multichannel Data Acquisition Systems
The ISL26311FBZ-T7A can be paired with an external analog multiplexer to build multichannel data acquisition (DAQ) systems at low cost. The pin-compatible ISL2631x family allows designers to migrate from the single-channel ISL26311FBZ-T7A to the multi-channel ISL26313 or ISL26314 on the same PCB layout, simplifying design reuse. Each conversion completes in 8 microseconds at 125 kSPS, enabling aggregate throughput of dozens of channels when scanning sensors sequentially. The differential input is ideal for thermocouple and RTD readouts where common-mode voltage is high. The 8-pin SOIC package keeps each ADC channel small, allowing high channel density per square inch of PCB. This makes the ISL26311FBZ-T7A a useful building block for modular DAQ cards and bench-top instruments.
Recomendado
Isolated Sensor Front-End
The ISL26311FBZ-T7A is well suited to isolated sensor front-ends used in motor drives, solar inverters, and high-voltage measurement systems. By placing the ADC on the high-voltage or sensor side of an isolation barrier, designers digitize the analog signal before crossing the barrier, eliminating analog isolation errors and bandwidth limitations. The differential input accepts the output of a high-side current sense amplifier or voltage divider, and the 2.7 V to 5.25 V supply is easily derived from an isolated DC-DC converter. The 125 kSPS sample rate captures motor current ripple and switching waveforms with adequate resolution. The 8-pin SOIC package keeps the high-side circuitry compact, simplifying thermal management near power devices.
Recomendado
General Purpose Precision Measurement
The ISL26311FBZ-T7A is a versatile choice for general purpose precision measurement, including temperature logging, transducer readback, and bench instrument channels. Its 12-bit resolution and 125 kSPS sample rate cover the dynamic range of most slow-to-medium-speed analog signals, while the differential input rejects ground noise in long cable runs. The SPI-compatible serial interface allows direct connection to virtually any microcontroller or FPGA, simplifying firmware development. The 8-pin SOIC package is widely available, easy to hand-solder for prototypes, and supported by automated assembly lines for volume production. Designers can standardize on the ISL26311FBZ-T7A as a default precision ADC and migrate to the ISL2631x family siblings when channel count or sample rate requirements change, without modifying the PCB layout.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISL26311FBZ-T7A — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | ISL26313FBZ | ISL26314FBZ | ISL26310FBZ | ISL26321FBZ-T7A | ISL26312FBZ |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-pin SOIC-N | 8-pin SOIC-N - same | 8-pin SOIC-N - same | 8-pin SOIC-N - same | 8-pin SOIC-N - same | 8-pin SOIC-N - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Input Channels | 1 differential | Multiple | Multiple | 1 | 1 differential | Multiple |
| 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 | 2.7 V to 5.25 V |
| Digital Interface | SPI / serial | SPI / serial | SPI / serial | SPI / serial | SPI / serial | SPI / serial |
| Pin-to-Pin Compatible | Reference (ISL26311) | Yes (same family) | Yes (same family) | Yes (same family) | Yes (same family) | Yes (same family) |
| Param Match | 100% (baseline) | ~90% (channel count diff) | ~90% (channel count diff) | ~90% (variant in family) | ~90% (2x sample rate) | ~90% (channel count diff) |
Principais diferenciais
- Pin-compatible with the entire ISL2631x family for PCB reuse (vs TI ADS7861 (SSOP-24))
- Compact 8-pin SOIC-N package saves board area (vs TI ADS8505 (24-pin SOIC))
- Differential input with high common-mode rejection (vs Renesas ISL26310FBZ)
Notas de projeto
Place a 10 uF bulk capacitor and a 0.1 uF ceramic decoupling capacitor as close as possible to the AVDD pin (pin 5) of the ISL26311FBZ-T7A. The bulk capacitor handles low-frequency supply noise, while the ceramic bypasses high-frequency noise. Keep the analog ground return path short and direct, ideally using a ground pour on a dedicated analog layer, to avoid digital switching noise coupling into the ADC reference.
Route the analog input traces (AIN+ and AIN-) as a tightly coupled differential pair, with matched length and a continuous ground reference beneath. Keep the digital SPI lines (CS, SCLK, SDOUT) physically separated from the analog inputs, ideally by a ground trace or by routing on a different layer. Place the external reference bypass (typically 10 uF plus 0.1 uF) close to the REF pin. The 8-pin SOIC-N package benefits from a thermal copper pour to keep the die temperature stable.
The ISL26311FBZ-T7A's differential input provides high common-mode rejection, but layout asymmetry degrades this benefit. Estimated: a 5 mm mismatch between the AIN+ and AIN- traces can convert a 1 V common-mode signal into a differential error of 1 percent at 1 MHz. Use symmetrical routing, identical via counts, and identical load impedances on both inputs to preserve CMRR. If a single-ended source is used, tie AIN- to the source ground at the IC, not at the source.
Do not exceed the maximum analog supply voltage of 5.25 V. Do not operate the digital interface at logic levels above AVDD, since the SDOUT pin is not over-voltage tolerant. Ensure the external reference voltage settles to within 0.1 percent of its final value before initiating a conversion, otherwise the first conversion result will be erroneous. Avoid running the serial clock faster than the part's rated maximum, and verify timing with the manufacturer datasheet.
Informações de conformidade
RoHS and lead-free status per Renesas product page. Halogen-free status not explicitly stated in the verified web data. AEC-Q100 not applicable for this part family - it is targeted at industrial and consumer applications, not automotive.
