ISL26104AVZ-T7A - 24-bit 4kSPS 4-Ch Sigma-Delta ADC | Renesas
MPN: ISL26104AVZ-T7A ✓ AktifISL26104AVZ-T7A Genel Bakış
A delta-sigma ADC is a type of oversampling converter that trades speed for resolution: an internal modulator shapes quantization noise away from the band of interest, and a digital decimation filter removes that noise to extract a high-resolution 24-bit code. The ISL26104's exceptionally low input-referred noise (about 10 nV/√Hz PGA equivalent, per the Renesas datasheet) places it firmly in the precision instrumentation category used in weigh scales, bridge transducers, and thermocouple acquisition.
Key features include 24-bit noise-free resolution at lower data rates, a PGA with gains of 1, 2, 4, 8, 16, 32, 64, and 128, a single-cycle settling digital filter, an integrated low-drift reference input, and a low quiescent current ideal for loop-powered or battery instruments. The four differential input channels are sequentially scanned via the MUX register, simplifying multi-sensor front ends by removing external analog switches.
Typical applications include industrial load-cell weigh scales, RTD and thermocouple temperature acquisition, pressure-sensor signal conditioning, multi-zone gas detection front ends, and precision laboratory instrumentation where 4 kSPS covers typical slow-control loops without sacrificing effective resolution.
When designing with this part, place 0.1 uF decoupling capacitors within 5 mm of AVDD and DVDD, keep the analog and digital grounds separated and joined only at the exposed pad, and choose an RGEF/A external reference or pair of input resistors to set the common-mode for thermocouple measurement.
This page synthesizes distributor stock and pricing as of 2026-10-13, drop-in TSSOP-28 alternatives from the same and cross-brand product families, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatifler için ISL26104AVZ-T7A — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller ISL26104AVZ-T7A (aynı form faktörü ve ayağa oturma) — farklı olan Input Type, Interface.
ISL26102AVZ-T7A
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ISL26104AVZ
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| Çözünürlük | 24-bit |
| Number of Input Channels | 4 differential |
| ADC Architecture | Sigma-Delta |
| Output Data Rate | 2.5 SPS to 4 kSPS |
| Analog Supply Voltage (AVDD) | 4.75 V to 5.25 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 5.25 V |
| PGA Gain Range | 1x to 128x |
| Input Type | Differential |
| Arayüz | SPI/QSPI/MICROWIRE-compatible serial |
| İşletim Sıcaklığı | -40 C to +105 C |
| Paket | 28-pin TSSOP |
| Montaj Türü | Surface Mount |
| Reference Input | External differential reference input (per Renesas datasheet) |
| RoHS Durumu | Compliant |
ISL26104AVZ-T7A Pin Yapısı
| Pin 1 | DVDD — Digital supply |
| Pin 2 | DGND — Digital ground |
| Pin 3 | SCLK — Serial clock input |
| Pin 4 | DOUT — Serial data output |
| Pin 5 | DIN — Serial data input |
| Pin 6 | CS — Chip select (active low) |
| Pin 7 | DRDY — Data ready output |
| Pin 8 | RESET — Reset input (active low) |
| Pin 9 | AVSS — Analog ground |
| Pin 10 | AVDD — Analog supply (5V) |
| Pin 11 | REFIN+ — Positive reference input |
| Pin 12 | REFIN- — Negative reference input |
| Pin 13 | AIN1P — Analog input 1 positive |
| Pin 14 | AIN1N — Analog input 1 negative |
| Pin 15 | AIN2P — Analog input 2 positive |
| Pin 16 | AIN2N — Analog input 2 negative |
| Pin 17 | AIN3P — Analog input 3 positive |
| Pin 18 | AIN3N — Analog input 3 negative |
| Pin 19 | AIN4P — Analog input 4 positive |
| Pin 20 | AIN4N — Analog input 4 negative |
| Pin 21 | PGA_OUT — PGA test/calibration output |
| Pin 22 | TEST — Test mode input |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | PAD — Exposed thermal pad (connect to AVSS) |
Tipik Uygulamalar
ISL26104AVZ-T7A için uygundur 6 uygulamas: Industrial Weigh Scales, Thermocouple Temperature Acquisition, Strain-Gauge Pressure Transducer Signal Conditioning, Multi-Zone Gas Detection Front Ends, Precision Laboratory Instrumentation, Battery-Operated Data Loggers.
Industrial Weigh Scales
The ISL26104AVZ-T7A's 4 differential channels and 24-bit resolution suit multi-load-cell weigh scales where each strain-gauge bridge requires its own low-noise front end. The integrated PGA (gains 1x-128x) directly amplifies low-output bridges without external instrumentation amplifiers, while 10 SPS and 80 SPS data rates (programmable) deliver typical commercial-scale noise-free counts. The 4.75-5.25 V analog supply is a direct match for industrial 5 V rails.
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Thermocouple Temperature Acquisition
The ISL26104AVZ-T7A fits multi-thermocouple data-acquisition modules where each cold-junction thermocouple channel requires a high-resolution, high-common-mode-rejection input. Four differential channels allow direct connection of up to four thermocouples with biasing resistors, eliminating external MUX chips. The 2.5 SPS to 4 kSPS selectable data rate lets designers trade resolution for sample speed per channel - operating at 10 SPS typically achieves >20 bits of effective noise-free resolution per the Renesas datasheet, well above thermocouple noise floors.
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Strain-Gauge Pressure Transducer Signal Conditioning
Pressure sensors based on bonded strain gauges output millivolt-level differential signals with low common-mode voltages, directly matching the ISL26104AVZ-T7A's PGA range of 1x to 128x and differential input structure. Four channels support multi-port pressure mapping in process-control and HVAC applications. Per the Renesas datasheet, the internal low-noise programmable gain amplifier achieves input-referred noise floor around 10 nV/√Hz at high gains, sufficient for medical-grade pressure-transducer front ends.
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Multi-Zone Gas Detection Front Ends
Multi-zone gas-detection systems using electrochemical or pellistor sensors benefit from the ISL26104AVZ-T7A's 4-channel differential inputs and ability to measure nA-to-uA sensor currents via the on-chip PGA. The 2.7 V to 5.25 V digital supply is compatible with battery-backed detectors for many hours, and the -40 C to +105 C operating range covers industrial-environment and indoor detector placements. The digital filter's single-cycle settling supports rapid channel switching when scanning zones sequentially.
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Precision Laboratory Instrumentation
Bench-top laboratory instrumentation such as pH meters, conductivity probes, and chromatograph detector front ends utilize the ISL26104AVZ-T7A's wide input range, high common-mode rejection, and selectable data rate. Each of the four differential inputs can be wired to a separate transducer output, making the part suitable for multi-sample-well analyzers. According to the Renesas datasheet, the low-drift design and integrated reference input keep gain error low over typical lab-temperature excursions.
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Battery-Operated Data Loggers
Remote, battery-operated data loggers for environmental and structural-health monitoring benefit from the ISL26104AVZ-T7A's low quiescent current and ability to run from a single 5 V analog supply plus a 3.3 V digital rail. The four differential channels support multi-sensor logging - typical strain, temperature, humidity, and pressure combinations. The 2.5 SPS lowest data rate coupled with duty-cycled sampling minimizes energy per conversion, extending battery life to years on a single primary cell in many remote-monitoring deployments.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: ISL26104AVZ-T7A — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | ISL26102AVZ-T7A | ISL26104AVZ |
|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | TSSOP-28 | TSSOP-28 (same) | TSSOP-28 (same) |
| Resolution | 24-bit | 24-bit | 24-bit |
| Number of Channels | 4 differential | 2 differential (-50%) | 4 differential (same) |
| Output Data Rate | 2.5 SPS to 4 kSPS | 2.5 SPS to 4 kSPS | 2.5 SPS to 4 kSPS |
| PGA Gain Range | 1x to 128x | 1x to 128x | 1x to 128x |
| Analog Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C |
| Packaging | Tape & Reel (-T7A) | Tape & Reel (-T7A) | Tube / Tray (no -T7A) |
Ana Farklılayıcılar
- 4 differential channels in TSSOP-28 (karşılaştırma:ISL26102AVZ-T7A)
- Integrated low-noise programmable gain amplifier (karşılaştırma:ADS1231)
- Wide PGA gain range with up to 128x gain (karşılaştırma:ADS1220)
Tasarım Notları
According to the Renesas datasheet, AVDD (4.75 V to 5.25 V) and DVDD (2.7 V to 5.25 V) must each be locally decoupled with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the package pins, plus a bulk 10 uF tantalum or polymer capacitor. Star-ground topology is recommended: route analog and digital ground planes separately and join them at a single point near the exposed thermal pad (pin 28), which must be soldered to the analog ground plane for both thermal dissipation and reference stability.
Keep analog input traces (AIN1P/N through AIN4P/N) physically separated from digital lines (SCLK, DOUT, CS) by at least 3x trace spacing or a guard ground trace to minimize digital switching noise coupling. Use a 4-layer PCB stack-up with a continuous analog ground plane beneath the ADC for best noise performance. Estimated: at 10 SPS data rate with PGA=128, the ISL26104AVZ-T7A achieves approximately 19-20 noise-free bits per the Renesas datasheet typical characteristic curves; this represents a noise floor of about 10 nV referred to input.
Common design pitfalls include: (1) leaving the exposed thermal pad un-soldered which destroys reference stability; (2) driving REFIN+ with a reference whose noise exceeds the ADC's own (use a low-noise reference such as Renesas ISL21009 or TI REF50xx); (3) exceeding AVDD maximum of 5.25 V from a poorly-regulated 5 V rail; (4) mis-reading DRDY (active low, requires proper MCU interrupt configuration); (5) forgetting channel-settling delay at high PGA gains where the input stage must settle before conversion - allow one conversion cycle of settling when switching channels per the datasheet calibration procedure.
Uyumluluk Bilgisi
Renesas ISL26104 series is RoHS compliant per distributor product pages (DigiKey, Mouser, LCSC). Not AEC-Q100 qualified - this is an industrial-grade ADC. Lead-free and halogen-free per Renesas product environmental compliance statements.
