ADS131M08 - 8-Ch 24-Bit 32kSPS Delta-Sigma ADC | TI
MPN： ADS131M08 ✓ 啟用中ADS131M08 概覽
A delta-sigma ADC oversamples the input signal and applies digital filtering to achieve very high resolution, making this converter category the dominant choice for precision measurements such as power metering. Within the signal-chain hierarchy, the ADS131M08 sits between analog front-end conditioning (resistor dividers, current transformers, shunts) and the digital MCU that processes energy computations.
Key features include eight simultaneously sampling differential inputs, programmable output data rate up to 32 kSPS, and programmable gain up to 128. Noise performance is 102-dB dynamic range at gain = 1 and 4 kSPS, and 80-dB dynamic range at gain = 64 and 4 kSPS. The device integrates a low-drift internal voltage reference, allowing ADC inputs to interface directly to resistor-divider networks or current-sensing elements without external precision references.
The simultaneous-sampling architecture is critical for polyphase energy metering: all eight channels convert at the same instant, preserving phase relationships between voltage and current channels needed for accurate active, reactive, and apparent power calculations. The ADS131M08 is AEC-Q100 qualified (temperature grade 1, -40C to +125C ambient) and Functional Safety-Capable, with documentation available to support functional safety system design, enabling automotive and industrial metering use.
Typical applications include three-phase smart energy meters, power quality analyzers, protective relay and circuit breaker monitoring, and solar inverter MPPT sensing. In a bidirectional interleaved buck-converter reference design, TI pairs the ADS131M08 with a C2000 MCU for precise current and voltage control.
Design tip: at gain = 64 the input-referred noise rises, so size shunt resistance and gain together to balance dynamic range against full-scale headroom.
直接替換替代品，適用於 ADS131M08 — 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： ADS131M08 （相同外形與佔位） — 差異在於 Number of Channels, Package, Application Focus, Input Type, Interface.
ADS131M08IPBS
✅ 直接替換聯絡詢價
查看資料表 →ADS131M08QPBSRQ1
✅ 直接替換聯絡詢價
查看資料表 →ADS131M06IPBS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS131M04IPBS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS131E08IPBS
⚡ 相同封裝📋 參考替代品（不在目錄中）
ADS131M08 最大額定值與電氣特性
| 解析度 | 24 bit |
| Number of Channels | 8 differential inputs |
| Sampling Architecture | Simultaneously sampling delta-sigma |
| 資料速率 | Programmable, up to 32 kSPS |
| Programmable Gain | Up to 128 |
| Dynamic Range (Gain=1, 4 kSPS) | 102 dB |
| Dynamic Range (Gain=64, 4 kSPS) | 80 dB |
| Reference | Internal low-drift reference |
| Input Interface | Direct resistor-divider or current-sensor connection |
| AEC-Q100 | Qualified, temperature grade 1 (-40C to +125C TA) |
| Functional Safety | Functional Safety-Capable (documentation available) |
| 封裝 | 32-TQFP (PBS), 5x5 mm |
| 安裝類型 | Surface Mount |
| Application Focus | Energy metering, power metrology, circuit breakers |
| Power | Low power |
ADS131M08 32-tqfp (pbs), 5x5 mm 腳位配置指南
ADS131M08（32-tqfp (pbs), 5x5 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： ADS131M08.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS131M08 適用於 6 應用s: Three-Phase Smart Energy Metering, Circuit Breaker and Protective Relaying, Solar Inverter MPPT and Grid Monitoring, Power Quality Analyzers, Motor Control Current Sensing, Battery Management and Test Equipment.
Three-Phase Smart Energy Metering
The ADS131M08's eight simultaneously sampling differential inputs capture all three phase voltages and currents (plus neutral) at the same instant, eliminating inter-channel skew that corrupts active and reactive power calculations. With 102-dB dynamic range at gain 1 and 4 kSPS, plus a low-drift internal reference, it interfaces directly to resistor dividers and current transformers without external precision references. The 32-kSPS rate supports harmonic analysis for modern metering accuracy classes.
推薦
Circuit Breaker and Protective Relaying
Protective circuit breakers require simultaneous, wide-dynamic-range measurement of phase currents and voltages to detect faults quickly and trip reliably. The ADS131M08's simultaneous sampling preserves phase relationships across channels, while 80-dB dynamic range at gain 64 allows direct small shunt signals. AEC-Q100 grade 1 qualification (-40C to +125C) on the Q1 variant and Functional Safety-Capable documentation support safety-relevant protection designs in industrial and automotive breakers.
推薦
Solar Inverter MPPT and Grid Monitoring
Grid-tied solar inverters need precise simultaneous voltage and current measurement on both DC and AC sides for maximum power point tracking, anti-islanding, and grid code compliance. The ADS131M08's eight differential channels monitor multiple strings and grid phases concurrently, and its 24-bit resolution with 102-dB dynamic range at 4 kSPS resolves small panel current differences. TI's reference design pairs it with a C2000 MCU for precise bidirectional buck-converter control.
推薦
Power Quality Analyzers
Power quality instruments measure harmonics, flicker, sags, and swells across multiple channels simultaneously. The ADS131M08's programmable 32-kSPS maximum data rate supports harmonic analysis well beyond the 50th order at 50/60 Hz, while 24-bit resolution and the low-drift internal reference maintain measurement accuracy over temperature. Simultaneous sampling of all eight differential inputs ensures phase-accurate cross-channel measurements required by power quality standards.
推薦
Motor Control Current Sensing
High-performance motor drives use inline shunt current sensing for field-oriented control. The ADS131M08's programmable gain up to 128 amplifies small shunt voltages directly, and simultaneous sampling synchronizes all phase-current measurements with the control loop. With a 32-kSPS data rate and low latency delta-sigma architecture, it feeds C2000 MCUs executing FOC algorithms; the 80-dB dynamic range at gain 64 resolves currents across wide load ranges in industrial drives and robotics.
推薦
Battery Management and Test Equipment
Battery test systems and BMS development tools require precise, simultaneous multi-cell voltage and current measurement. The ADS131M08's eight 24-bit differential channels monitor cell voltages and pack current concurrently, while the low-drift internal reference and 102-dB dynamic range at gain 1 deliver the millivolt-level accuracy needed for state-of-charge estimation. The SPI interface integrates easily with host MCUs, and low power operation suits rack-mounted cyclers and portable analyzers alike.
推薦
推薦產品摘要
工程參考資料，適用於 ADS131M08 — 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 | ADS131M08IPBS | ADS131M08QPBSRQ1 | ADS131M04IPBS |
|---|---|---|---|---|
| Package | 32-TQFP (PBS) 5x5 mm | 32-TQFP (PBS) - same | 32-TQFP (PBS) - same | 32-TQFP (PBS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 8 simultaneous | 8 simultaneous | 8 simultaneous | 4 simultaneous |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit |
| Max Data Rate | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS |
| Dynamic Range (G=1, 4 kSPS) | 102 dB | 102 dB | 102 dB | 102 dB |
| AEC-Q100 Qualified | Q1 variant available | No (industrial) | Yes (grade 1) | Q1 variant available |
| Reference | Internal low-drift | Internal low-drift | Internal low-drift | Internal low-drift |
主要差異化特點
- Eight simultaneous channels in one footprint (對比ADS131M04IPBS)
- Automotive AEC-Q100 grade 1 option (對比ADS131M08IPBS)
- Higher data rate than E-family (對比ADS131E08IPBS)
設計說明
Simultaneous sampling only helps if the front end is symmetric. Match anti-alias filter components and trace lengths across all eight differential input pairs so voltage and current channels preserve phase relationships. TI's energy metering reference designs use matched RC filters per channel before the ADC inputs.
At programmable gain 64, dynamic range drops to 80 dB (at 4 kSPS), so a small shunt signal gains amplification but loses noise headroom. Size shunt resistance and gain together: choose gain so maximum expected shunt voltage fills the input full-scale without clipping at fault currents.
Use the low-drift internal reference to save BOM cost, but if board-level accuracy class demands it, evaluate the analog supply and reference decoupling per the TI datasheet layout guidance. Keep the delta-sigma modulator clocks away from the analog inputs and use a solid ground plane under the 5x5 mm TQFP.
合規資訊
AEC-Q100 qualified (temperature grade 1, -40C to +125C) per TI datasheet for the Q1 variant. Functional Safety-Capable with supporting documentation. Other compliance statuses not stated in provided data.
