NAFE13388 - 24-bit 8-Ch ±25V Universal Input AFE | NXP
MPN： NAFE13388 ✓ 啟用中NAFE13388 概覽
An analog front-end (AFE) is the circuit block that conditions real-world analog signals - voltage, current, resistance, temperature - before digitization. In the signal-chain hierarchy it sits between field sensors or transducers and the digital controller: multiplexer -> programmable gain amplifier (PGA) -> ADC. Universal-input AFEs like the NAFE13388 replace dozens of discrete signal-conditioning components by integrating low-leakage high-voltage fast multiplexers, a low-offset low-drift PGA, and a precision converter in one silicon device.
Key features include the ±25 V input tolerance that removes the need for external attenuators and protection in many industrial modules, low-leakage HV analog inputs configurable from eight single-ended to four differential channels with external common input (AICOM) or internal AGND reference, and integrated excitation sources that directly drive RTDs and other resistive sensors. The device also integrates multiple diagnostic features that support industrial functional-safety and self-test requirements.
Architecturally, the NAFE13388 combines the fast HV multiplexers with a low-offset, low-drift programmable gain amplifier and a 24-bit converter, delivering high-precision multichannel measurement with low power. The factory-ordered configuration options (part number suffix) cover speed/power variants and calibration options within the NAFEx3388 family.
Typical applications include industrial process-control analog input modules (PLC AI cards), building and factory automation systems, RTD/thermocouple universal input measurement, and test-and-measurement equipment where 8 channels of ±25 V-capable, 24-bit digitization in one IC dramatically reduces BOM size and calibration effort.
Design consideration: because the part tolerates ±25 V directly at the pins, layout should still observe creepage/clearance rules for HV rails, and the excitation sources must be budgeted into the 150 mW power envelope.
This page adds distributor availability data, drop-in family alternatives, and practical design guidance beyond the manufacturer datasheet.
直接替換替代品，適用於 NAFE13388 — 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： NAFE13388 （相同外形與佔位） — 差異在於 Excitation Sources, Grade, Input Voltage Range, Number of Input Channels, Power Consumption.
NAFE13388 最大額定值與電氣特性
| Product Type | Universal input analog front-end (AFE) |
| Number of Input Channels | 8 (up to 4 differential) |
| ADC Resolution | 24 bit |
| 輸入電壓範圍 | ±25 V (HV analog inputs) |
| Power Consumption | 150 mW |
| Excitation Sources | Integrated (on-chip) |
| Input Multiplexer | Low-leakage high-voltage fast multiplexer |
| PGA | Low-offset, low-drift programmable gain amplifier |
| Reference Options | External common input (AICOM) or internal AGND |
| Diagnostics | Integrated diagnostic features |
| 封裝 | 64-HVQFN (9x9 mm) |
| 安裝類型 | Surface Mount |
| Grade | Industrial-grade |
| Orderable Part (SKU) | NAFE13388B40BSK |
| 生命週期狀態 | Active |
NAFE13388 64-hvqfn (9x9 mm) 腳位配置指南
NAFE13388（64-hvqfn (9x9 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： NAFE13388.
請參閱 資料表 以查看完整腳位配置。
典型應用
NAFE13388 適用於 6 應用s: Industrial PLC Analog Input Modules, RTD and Thermocouple Temperature Measurement, Building and Factory Automation, Test and Measurement Instrumentation, Battery-Operated Data Loggers, Energy and Power Monitoring.
Industrial PLC Analog Input Modules
The NAFE13388 fits PLC analog input cards because its ±25 V HV inputs tolerate industrial 24 V field signal levels directly, eliminating external attenuators and protection stages. Eight single-ended or four differential channels per IC let one device cover a typical 8-point AI card, and integrated diagnostics support module self-test routines required in industrial automation. Used between field terminals and the module MCU over SPI, the 24-bit converter resolves both 0-10 V and millivolt signals with one architecture. The main trade-off is power: budget the 150 mW consumption across channel count in dense cards. NXP application note AN14547 documents a four-channel universal input solution using this family, providing a validated reference for module designers.
推薦
RTD and Thermocouple Temperature Measurement
The NAFE13388 integrates excitation sources that directly drive RTD sensors, while its low-offset, low-drift PGA and 24-bit delta-sigma ADC resolve microvolt-level thermocouple signals. Because inputs tolerate ±25 V, one universal input channel can be wired for RTD, thermocouple or plain voltage probes without front-end rework - a key requirement in building automation and process instrumentation. Place the excitation source current through the RTD and measure with the PGA in high-gain mode; the 24-bit result supports 0.1 C-class accuracy with proper linearization. The trade-off versus a dedicated temperature AFE is slightly higher power (150 mW), acceptable in mains-powered modules. The NAFE13388-UIM Arduino shield provides a quick evaluation path for this use case.
推薦
Building and Factory Automation
In building management systems (BMS) and factory automation I/O, the NAFE13388 consolidates analog sensing of 0-10 V actuators, resistive sensors and contact-level signals into one IC. The ±25 V input rating covers wiring faults such as miswired 24 V field power onto an analog input - a common field failure that destroys conventional AFEs. Integrated diagnostics enable periodic channel health checks without extra muxes or comparators. Its 150 mW budget suits DIN-rail mounted controllers with passive cooling, and the SPI interface pairs with standard automation MCUs. Designers should observe creepage/clearance rules at the HV terminals even though the IC tolerates the voltage. NXP's open-CMSIS driver packs on the NAFE13388-UIM board shorten firmware development for these platforms.
推薦
Test and Measurement Instrumentation
Bench and modular instruments (DAQ modules, data loggers) benefit from the NAFE13388's combination of 24-bit resolution, eight multiplexed inputs and ±25 V direct measurement range. The low-leakage HV multiplexer preserves accuracy when measuring high-impedance sources, and the PGA's low drift keeps gain error stable across temperature, reducing calibration frequency. Integrated excitation sources let a single instrument channel handle voltage, current-shunt and resistance measurements by reconfiguration rather than re-wiring. At 150 mW the device suits portable and rack instruments alike. When scanning channels at speed, account for delta-sigma settling per channel switch - consult the NXP datasheet timing tables. The GitHub nxp-appcodehub examples (NAFE13388 with i.MX RT1170) provide ready-made acquisition firmware for prototyping.
推薦
Battery-Operated Data Loggers
The NAFE13388's 150 mW operating power, combined with its ability to wake, scan multiple channels and return results over SPI, suits multi-channel battery-powered loggers used in energy monitoring and condition monitoring. The ±25 V input tolerance protects against transient overvoltage on long field cabling where surge protection is limited by battery budget. Because excitation sources are integrated, RTD logging needs no external current source, saving quiescent power and board area versus discrete solutions. Duty-cycle the converter between samples to push average power well below the 150 mW active figure. Note that 24-bit conversion takes longer per sample than 16-bit - the family's NAFE73388 variant trades resolution for speed in power-critical designs.
推薦
Energy and Power Monitoring
Energy meters and submetering nodes use the NAFE13388 to digitize voltage-divider and current-transformer signals with 24-bit accuracy; four differential configurations map naturally to single-phase plus neutral or multi-circuit monitoring. The ±25 V rating allows direct connection to resistor-divided bus voltages, and AICOM referencing simplifies shared-common input topologies common in metering front ends. Integrated diagnostics support tamper and self-test detection increasingly required in smart-meter standards environments. At 150 mW the AFE fits both panel-mounted meters and DIN-rail submeters. Designers should verify converter timing against the metering standard's update-rate requirements and use the NXP datasheet's noise tables to confirm ENOB at the target sample rate before finalizing accuracy budgets.
推薦
推薦產品摘要
工程參考資料，適用於 NAFE13388 — 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 | NAFE73388 |
|---|---|---|
| Package | 64-HVQFN (9x9 mm) | 64-HVQFN (9x9 mm) - same footprint |
| Brand | NXP Semiconductors | NXP Semiconductors |
| ADC Resolution | 24 bit | 16 bit |
| Input Channels | 8 (up to 4 differential) | 8 (up to 4 differential) |
| Input Voltage Range | ±25 V | ±25 V |
| Excitation Sources | Integrated | Integrated |
| Lifecycle Status | Active | Active |
主要差異化特點
- Direct ±25 V inputs remove external attenuation (對比Discrete PGA + ADC chains)
- Integrated excitation sources for resistive sensors (對比NAFE73388)
- Single-IC 8-channel consolidation (對比TI/ADI multichannel delta-sigma AFEs)
設計說明
Although the NAFE13388 tolerates ±25 V directly at its HV analog input pins, PCB layout must still maintain appropriate creepage and clearance distances between the field-input nets and low-voltage digital circuitry per the end equipment's insulation requirements. Use a solid AGND plane under the AFE, keep the 64-HVQFN exposed pad soldered to a grounded thermal land with an adequate via array, and route the SPI clock away from the analog input traces to avoid digital coupling into the 24-bit converter front end.
Budget the 150 mW active consumption from the DigiKey listing for NAFE13388B40BSK, plus any excitation-source current delivered to external sensors such as RTDs. Estimated: at a 3.3 V analog supply, 150 mW implies roughly 45 mA average - verify your LDO thermal capability accordingly. For battery designs, duty-cycle conversions between samples to reduce average power well below the active figure, and consult the datasheet per-mode current tables for sleep and idle states.
Do not assume all NAFEx3388 family members are identical: NXP states the family differs in high-speed/low-power class, factory calibration, and 24-bit vs 16-bit ADC. Ordering the wrong suffix (for example a 16-bit or non-calibrated variant instead of NAFE13388B40BSK) will change system accuracy. Also, when switching multiplexer channels between conversions, allow the delta-sigma converter's full settling time per the NXP datasheet timing specification before latching a result, or channel-to-channel accuracy will degrade.
合規資訊
Compliance details not present in the retrieved web data; verify RoHS/REACH status on the NXP product page for NAFE13388B40BS under Environmental Quality.
