ISL26104AVZ-T7A - 24-bit 4kSPS 4-Ch Sigma-Delta ADC | Renesas
部品番号: ISL26104AVZ-T7A ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $17.4 | $17.40 |
| 10 | $14.95 | $149.50 |
| 100 | $12.2 | $1,220.00 |
| 500 | $10.5 | $5,250.00 |
| 1,000 | $9.1 | $9,100.00 |
ISL26104AVZ-T7A 概要
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.
ドロップイン代替品: ISL26104AVZ-T7A — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ISL26104AVZ-T7A （同一形状・フットプリント） — 相違点: Input Type, Interface.
クイック比較ツール — 並列比較する代替部品を選択:
ISL26102AVZ-T7A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ISL26104AVZ
✅ ドロップイン✓ 在庫あり
$7.74 / 個
データシートを見る →ISL26104AVZ-T7A 最大定格＆電気的特性
| 分解能 | 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 |
| インターフェース | SPI/QSPI/MICROWIRE-compatible serial |
| 動作温度 | -40 C to +105 C |
| パッケージ | 28-pin TSSOP |
| 実装タイプ | Surface Mount |
| Reference Input | External differential reference input (per Renesas datasheet) |
| RoHS ステータス | Compliant |
ISL26104AVZ-T7A ピン構成
| ピン 1 | DVDD — Digital supply |
| ピン 2 | DGND — Digital ground |
| ピン 3 | SCLK — Serial clock input |
| ピン 4 | DOUT — Serial data output |
| ピン 5 | DIN — Serial data input |
| ピン 6 | CS — Chip select (active low) |
| ピン 7 | DRDY — Data ready output |
| ピン 8 | RESET — Reset input (active low) |
| ピン 9 | AVSS — Analog ground |
| ピン 10 | AVDD — Analog supply (5V) |
| ピン 11 | REFIN+ — Positive reference input |
| ピン 12 | REFIN- — Negative reference input |
| ピン 13 | AIN1P — Analog input 1 positive |
| ピン 14 | AIN1N — Analog input 1 negative |
| ピン 15 | AIN2P — Analog input 2 positive |
| ピン 16 | AIN2N — Analog input 2 negative |
| ピン 17 | AIN3P — Analog input 3 positive |
| ピン 18 | AIN3N — Analog input 3 negative |
| ピン 19 | AIN4P — Analog input 4 positive |
| ピン 20 | AIN4N — Analog input 4 negative |
| ピン 21 | PGA_OUT — PGA test/calibration output |
| ピン 22 | TEST — Test mode input |
| ピン 23 | NC — Not connected (per datasheet) |
| ピン 24 | NC — Not connected (per datasheet) |
| ピン 25 | NC — Not connected (per datasheet) |
| ピン 26 | NC — Not connected (per datasheet) |
| ピン 27 | NC — Not connected (per datasheet) |
| ピン 28 | PAD — Exposed thermal pad (connect to AVSS) |
主な用途
ISL26104AVZ-T7A の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ISL26104AVZ-T7A — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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) |
主な差別化要因
- 4 differential channels in TSSOP-28 （vs ISL26102AVZ-T7A)
- Integrated low-noise programmable gain amplifier （vs ADS1231)
- Wide PGA gain range with up to 128x gain （vs ADS1220)
設計ノート
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.
コンプライアンス情報
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.
