ISL26311FBZ - 12-bit 125kSPS SAR ADC | Renesas Electronics
N.º da peça: ISL26311FBZ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.85 | $3,85 |
| 10 | $3.45 | $34,50 |
| 100 | $2.95 | $295,00 |
| 500 | $2.62 | $1.310,00 |
| 1.000 | $2.3 | $2.300,00 |
ISL26311FBZ Visão geral
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm with an internal DAC and comparator to digitize an analog input one bit at a time per clock cycle. SAR ADCs sit in the broader hierarchy of ADC architectures (SAR -> Nyquist-rate ADC -> data converter -> mixed-signal IC -> semiconductor) and are favored for medium-resolution, medium-speed acquisitions where low latency, deterministic sampling, and excellent DC accuracy are required.
Key features include 12-bit resolution, 125 kSPS maximum sampling rate, single-channel input with single-ended or differential operation, an internal reference, and a SPI/QSPI/MICROWIRE-compatible serial interface. The wide analog input range and integrated input multiplexer simplify front-end signal conditioning, while the small 8-pin SOIC footprint supports compact PCB layouts in space-constrained designs.
The device uses a low-noise charge-redistribution SAR architecture with an input track-and-hold, achieving ±1 LSB INL and low aperture jitter. The robust digital interface simplifies host-MCU integration, and the part operates from a single analog supply, reducing external component count. Its low power consumption makes it suitable for battery-powered data-acquisition systems.
Typical applications include industrial process control loop monitoring, portable instrumentation and data loggers, multi-channel sensor signal acquisition, medical patient-monitoring front ends, and precision measurement equipment. The single-supply operation simplifies isolated sensor interface designs where low power and small package size are critical.
When designing with this ADC, ensure the analog input does not exceed the supply rails and use the recommended bypass capacitors on AVDD and DVDD. The internal reference may be bypassed with an external capacitor for low-noise operation; verify timing against the SAR acquisition window in your specific signal-chain design.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers a single reference for sourcing and substituting the ISL26311FBZ.
Alternativas drop-in para ISL26311FBZ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ISL26311FBZ (mesmo formato e footprint) — diferindo em Package, Input Type, Number of Input Channels, Interface, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISL26321FBZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL26311FBZ-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADS7822PG4
✅ Drop-In✓ Em estoque
$3.2 / unidade
Ver ficha técnica →ADS7816PG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ISL26311FBZ Classificações máximas e características elétricas
| Resolução | 12 bit |
| Taxa de amostragem | 125 kSPS |
| Number of Input Channels | 1 (single-ended or differential) |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended / Differential |
| Data Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Encapsulamento | 8-pin SOIC |
| Tipo de montagem | Surface Mount |
| Reference | Internal |
| Tensão de alimentação | Single supply, see datasheet |
| Power Consumption | Low power (see datasheet) |
| Faixa de temperatura de operação | Industrial, see datasheet |
| Status RoHS | Compliant |
| Manufacturer | Renesas Electronics (formerly Intersil) |
| Conversion Latency | Deterministic per SAR cycle |
Configuração de pinos do ISL26311FBZ
| Pino 1 | AIN+ — Analog input positive (differential mode) or single-ended input |
| Pino 2 | AIN- — Analog input negative (differential mode) or ground reference |
| Pino 3 | GND — Ground |
| Pino 4 | REF — Reference voltage input/output (internal reference) |
| Pino 5 | DVDD — Digital supply voltage |
| Pino 6 | DOUT — Serial data output (SPI) |
| Pino 7 | SCLK — Serial clock input |
| Pino 8 | CS — Chip select (active low) |
Aplicações típicas
ISL26311FBZ é adequado para 6 aplicaçãos: Industrial Process Control Loop Monitoring, Portable Data Loggers and Handheld Instrumentation, Multi-Channel Sensor Signal Acquisition, Medical Patient Monitoring Front End, Precision Measurement and Test Equipment, Isolated Sensor Interface Modules.
Industrial Process Control Loop Monitoring
The ISL26311FBZ's 12-bit resolution and 125 kSPS sampling rate make it well-suited for monitoring 4-20 mA or 0-10 V process-control signals in industrial PLCs and DCS systems. With a single-channel differential input and SPI interface, the ADC can digitize a single sensor signal per chip with strong common-mode rejection against ground loops typical in factory environments. The low power consumption and small SOIC-8 footprint ease integration into compact analog input cards, while the internal reference simplifies BOM. Designers typically place the ISL26311FBZ behind an instrumentation amplifier and isolation barrier, using its deterministic SAR latency to feed control loops with predictable timing.
Recomendado
Portable Data Loggers and Handheld Instrumentation
Battery-powered data loggers benefit from the ISL26311FBZ's low power consumption and single 8-SOIC footprint, which together reduce BOM cost and PCB area. The 12-bit, 125 kSPS conversion rate is sufficient to capture temperature, pressure, voltage, and current sensor signals at logging rates from a few Hz up to audio-bandwidth sampling. The internal reference eliminates an extra component, simplifying enclosure design for handheld cases where board space is at a premium. Designers often pair the ISL26311FBZ with a low-power MCU such as an MSP430 or RL78 to build multi-week battery-life loggers for field service technicians.
Recomendado
Multi-Channel Sensor Signal Acquisition
When paired with an external analog multiplexer, the ISL26311FBZ can digitize multiple sensor channels sequentially at 125 kSPS aggregate throughput, supporting thermocouple, RTD, strain gauge, and bridge-pressure sensor arrays. The differential input mode rejects common-mode noise shared across sensor cables, critical when sensors are physically separated from the data-acquisition board. The SAR architecture's deterministic latency simplifies synchronization with host-side DSP filtering. The 8-SOIC package keeps each ADC channel-isolated on small daughterboards for distributed sensing topologies in machine-vision and condition-monitoring systems.
Recomendado
Medical Patient Monitoring Front End
The ISL26311FBZ's differential input and 12-bit resolution are appropriate for digitizing ECG, SpO2, temperature, and respiration sensor signals in patient monitors. The SPI-compatible interface simplifies connection to low-power medical MCUs, while the SOIC-8 package supports compact, isolated analog-front-end designs required by IEC 60601 patient-safety standards. The internal reference reduces component count for cost-sensitive medical disposables. Designers typically use the ISL26311FBZ as part of a multi-ADC front-end panel where each chip handles one isolated patient parameter.
Recomendado
Precision Measurement and Test Equipment
Benchtop multimeters, bench data-acquisition systems, and laboratory instrumentation leverage the ISL26311FBZ's 12-bit accuracy and differential input to digitize analog measurement channels. The SPI interface allows easy connection to FPGAs or DSPs for further digital signal processing, while the SOIC-8 package simplifies layout on mixed-signal boards with strict analog-digital partitioning. Designers use the ISL26311FBZ as a per-channel ADC in modular digitizer cards where deterministic SAR sampling is preferred over delta-sigma latency.
Recomendado
Isolated Sensor Interface Modules
Industrial sensor-to-bus modules with galvanic isolation use the ISL26311FBZ on the field side to digitize analog sensor signals before crossing the isolation barrier. This reduces noise pickup from long cable runs and enables digital isolation at much lower data rates than analog isolation. The single-channel, single-ended/differential input covers most 4-20 mA, 0-10 V, and bridge-sensor outputs. The small 8-SOIC package fits alongside digital isolators on compact DIN-rail or panel-mount module PCBs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISL26311FBZ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISL26321FBZ | ISL26311FBZ-T | ADS7822PG4 | ADS7816PG4 |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Texas Instruments |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 125 kSPS | 125 kSPS | 125 kSPS | 200 kSPS | 200 kSPS |
| Input Channels | 1 | Multiple (higher count) | 1 | 1 | 1 |
| Input Type | Single-ended / Differential | Single-ended / Differential | Single-ended / Differential | Single-ended / Differential | Pseudo-differential |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI | SPI |
| Reference | Internal | Internal | Internal | External | External |
Principais diferenciais
- Internal reference eliminates external component (vs ADS7822PG4)
- Pin-compatible higher-channel upgrade path (vs ISL26321FBZ)
- Deterministic SAR latency for control loops (vs AD7995YRMZ-0)
Notas de projeto
The ISL26311FBZ requires proper decoupling on both AVDD and DVDD pins. Place a 10 uF tantalum or ceramic capacitor in parallel with a 0.1 uF ceramic bypass capacitor as close as possible to each supply pin to minimize digital switching noise coupling into the analog front end. Estimated: a 0.1 uF X7R ceramic with 1 oz copper trace provides approximately 10 nH of effective inductance, sufficient to filter SAR conversion transients up to 125 kSPS.
Keep analog input traces short and routed away from digital lines, particularly SCLK and DOUT, to avoid digital coupling into the analog front end. Use a ground plane under the SOIC-8 footprint to provide a low-impedance return path, and avoid running analog traces parallel to digital clock lines. Place the reference bypass capacitor directly at the REF pin with a short, wide trace to minimize reference noise pickup.
Do not exceed the absolute maximum analog input voltage relative to AVDD/GND; voltages outside the input common-mode range can permanently damage the ADC input stage. When using differential inputs, ensure the common-mode voltage remains within the specified range. Verify timing of CS, SCLK, and DOUT against the datasheet timing diagram to avoid data corruption at high clock frequencies.
Informações de conformidade
RoHS and REACH compliant per Renesas product page. Not AEC-Q100 qualified - standard industrial grade. Lead-free finish. Halogen-free status not explicitly stated in verified data.
