ADS131M08IRSNR - 24-Bit 32kSPS 8-Ch Delta-Sigma ADC | TI
MPN： ADS131M08IRSNR ✓ 啟用中ADS131M08IRSNR 概覽
A delta-sigma ADC is a type of analog-to-digital converter that oversamples the input signal and applies digital filtering to achieve very high resolution, making the device family a key element of the broader signal chain hierarchy: delta-sigma ADC -> data converter -> mixed-signal IC -> semiconductor. Because the channels are sampled simultaneously, phase relationships between all inputs are preserved - critical for multi-phase power measurement.
Key features include 24-bit resolution across all eight simultaneous channels, a programmable output data rate up to 32 kSPS, energy-measurement-specific features such as a built-in phase calibration and a wide dynamic range optimized for current transformers, shunts, and Rogowski coils. The inputs can interface directly to resistor-divider networks or power-line monitoring circuitry, and the device communicates over a SPI-compatible serial interface.
Architecturally, each channel uses its own delta-sigma modulator with a shared digital filter stage, guaranteeing inherent simultaneous sampling without channel-to-channel skew. TI specifically designed the ADS131M08 for energy metering, power metrology, and circuit breaker applications, where wide dynamic range and channel-to-phase accuracy translate directly into metering class compliance.
Typical applications include polyphase smart energy meters, solar string inverters and power quality analyzers, plus power metrology in motor control and circuit breaker protection where multiple voltage and current channels must be digitized with zero sample skew.
A key design consideration is that the ADC inputs can be driven directly from resistor dividers, but anti-aliasing filter design and reference stability directly determine achievable ENOB - verify the manufacturer datasheet guidance before finalizing the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ADS131M08IRSNR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS131M08IRSNR （相同外形與佔位） — 差異在於 Interface, Number of Channels, Package, Power Consumption, Sampling Rate.
ADS131M06IRSNT
✅ 直接替換📋 參考替代品（不在目錄中）
ADS131M04IRSNT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS131M02IRSNT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS131M08QPBSRQ1
✅ 直接替換聯絡詢價
查看資料表 →ADS131M08IRSNR 最大額定值與電氣特性
| 解析度 | 24 bit |
| Number of Channels | 8 (simultaneous sampling) |
| Converter Type | Delta-Sigma (ΔΣ) |
| 取樣率 | up to 32 kSPS per channel |
| Number of Inputs | 8 |
| 介面 | SPI (serial) |
| 封裝 | 32-QFN (4x4 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +125C (I grade) |
| Typical Applications | Energy metering, power metrology, circuit breakers |
| Input Interfacing | Direct resistor-divider or transformer interface |
| Dynamic Range | Wide dynamic range (energy-measurement optimized) |
| Power Consumption | Low power (per datasheet) |
| RoHS 狀態 | Compliant (standard TI offering) |
ADS131M08IRSNR 32-qfn (4x4 mm) 腳位配置指南
ADS131M08IRSNR（32-qfn (4x4 mm) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ADS131M08IRSNR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS131M08IRSNR 適用於 6 應用s: Polyphase Smart Energy Meters, Solar String Inverters, Circuit Breakers and Protection Relays, Power Quality Analyzers, Motor Control and Drive Metrology, Bidirectional DC-DC Converter Control.
Polyphase Smart Energy Meters
The ADS131M08's eight simultaneously-sampling 24-bit channels are purpose-built for polyphase metering: three phase voltages, three phase currents, neutral current, and one spare channel all digitize with zero inter-channel skew, which is mandatory for accurate active/reactive power calculation across phases. The wide dynamic range supports direct connection to resistor-divider voltage sensing and CT or shunt current sensing without external gain stages. Its energy-measurement-specific features, such as phase calibration, help designers meet metering accuracy class requirements, while the low-power operation suits communication-enabled smart meter endpoints.
推薦
Solar String Inverters
In grid-tied solar string inverters, the ADS131M08 digitizes DC string voltages/currents plus AC grid side voltage and current channels simultaneously, enabling accurate power, energy, and power-factor computation for grid compliance and MPPT control. The 32-kSPS per-channel rate provides ample bandwidth for 50/60 Hz metrology with margin for harmonics analysis, and the 24-bit resolution resolves low-current night-time consumption for anti-islanding and standby-power monitoring. Simultaneous sampling preserves phase alignment between grid voltage and inverter output current - critical for accurate feed-in billing and reactive power control.
推薦
Circuit Breakers and Protection Relays
The ADS131M08 fits circuit breaker and protection applications because it continuously samples multiple current channels with wide dynamic range, capturing both normal load currents and short-circuit fault transients without range switching. The simultaneous sampling of all eight channels means phase comparison and residual (sum-of-currents) earth-fault detection remain phase-accurate. Its energy-measurement heritage provides precise RMS computation from the digitized streams, letting protection algorithms trip on accurate thresholds, while SPI CRC error checking ensures data integrity in the electrically noisy switchgear environment.
推薦
Power Quality Analyzers
Power quality analyzers must measure voltage sags, swells, harmonics, and unbalance across all three phases at once. The ADS131M08's eight simultaneous 24-bit channels capture all phase voltages and currents coherently, and its 32-kSPS maximum data rate resolves harmonic content well beyond the 50th harmonic order per IEC-type measurement practice. The wide dynamic range accommodates both high load currents and small leakage/standby currents in a single range, and per-channel delta-sigma modulators eliminate multiplexer settling artifacts that plague scanned-input ADCs in power quality instruments.
推薦
Motor Control and Drive Metrology
In motor drives, the ADS131M08 provides simultaneous digitization of three phase currents plus DC bus voltage and current, giving the control loop phase-accurate feedback for field-oriented control and precise power metering of the drive. The 32-kSPS rate comfortably exceeds typical PWM control-loop update rates, and the delta-sigma architecture provides inherent anti-aliasing that suppresses switching-frequency noise from the inverter stage. Its low latency filter modes support fast overcurrent detection, while the 24-bit resolution enables high-accuracy torque ripple and efficiency analysis in lab and production test systems.
推薦
Bidirectional DC-DC Converter Control
TI's reference design for precisely controlling the current and voltage of a bidirectional interleaved buck-converter power stage pairs a C2000 MCU with the ADS131M08 precision ADC. The ADC's simultaneous multi-channel sampling captures inductor currents and bus voltages without skew, enabling accurate current sharing between interleaved phases and fast transient response in battery charge/discharge and energy-storage converters. The 24-bit resolution supports coulomb-counting-level current accuracy, while the SPI interface with CRC gives the digital controller clean, trustworthy feedback data in high dV/dt power conversion environments.
推薦
推薦產品摘要
工程參考資料，適用於 ADS131M08IRSNR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS131M06IRSNT | ADS131M04IRSNT | ADS131M02IRSNT | ADS131M08QPBSRQ1 |
|---|---|---|---|---|---|
| Package | QFN-32 (4x4 mm) | QFN-32 (4x4 mm) - same | QFN-32 (4x4 mm) - same | QFN-32 (4x4 mm) - same | VQFN-64 - different footprint (Q1 variant) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit | 24 bit |
| Channel Count | 8 (simultaneous) | 6 | 4 | 2 | 8 |
| Max Sampling Rate | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS |
| Sampling Architecture | Simultaneous sampling | Simultaneous sampling | Simultaneous sampling | Simultaneous sampling | Simultaneous sampling |
| Interface | SPI (serial) | SPI (serial) | SPI (serial) | SPI (serial) | SPI (serial) |
主要差異化特點
- Full 8-channel simultaneous sampling in a compact 4x4 mm footprint (對比ADS131M06IRSNT)
- Energy-measurement-specific feature set (對比AD7768)
- Cost optimization path within the same footprint (對比ADS131M04IRSNT)
設計說明
Keep the analog front-end routing for the eight input channels symmetric and away from the SPI clock lines to prevent digital coupling into the delta-sigma inputs. Place a solid ground plane under the QFN-32 (4x4 mm) and use a low-ESR 100 nF decoupling capacitor at each supply pin plus bulk capacitance near the device. Route voltage-channel resistor dividers with short, matched traces so per-channel parasitics remain consistent across phases - mismatch here directly appears as phase error in metering calculations.
Because each of the eight channels has its own modulator, simultaneous sampling is inherent - but the accuracy of phase relationships depends on a clean master clock. Use a crystal or low-jitter oscillator for the ADC clock rather than an MCU-generated GPIO clock, and follow the TI datasheet SPI timing requirements (setup/hold) to avoid read errors at high SCLK rates. Enable the optional CRC data-word check when operating in electrically noisy switchgear or inverter environments.
Do not assume the ADS131M08QPBSRQ1 automotive variant is pin-compatible on your board - it comes in a larger VQFN-64 package, so switching grades mid-design requires PCB rework. Also, performance metrics such as SNR and ENOB are characterized differently between vendors; per the TI E2E forum discussion on ADS131M08 vs Microchip MCP3914A1, a direct datasheet-to-datasheet comparison of SINAD/SFDR between manufacturers is not valid. Always compare against TI's own characterization conditions stated in the ADS131M08 datasheet.
合規資訊
RoHS status per standard TI offering (IRSNR suffix, Tape & Reel). Not AEC-Q100 qualified - use ADS131M08QPBSRQ1 for automotive. Detailed REACH/halogen status: verify on TI.com product page.
