AFE88101中文资料适用于传感器和现场变送器应用的单通道、低功耗、16 位 DAC数据手册TI规格书

描述 Description

The 16-bit AFE88101 and 14-bit AFE78101 ( AFEx8101) are highly-integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for sensor-transmitter applications.

The AFEx8101 devices include most of the components required to design a 4‑mA to 20‑mA, 2‑wire (loop-powered) sensor transmitter. In addition to the highly accurate DAC, these devices include a 10‑ppm/°C voltage reference and a diagnostic analog-to-digital converter (ADC). To accommodate intrinsic and functional-safety concerns, external voltage-to-current conversion and power regulation are required.

The internal diagnostic ADC is multiplexed to several internal nodes that enable an automatic self-health check. This check is capable of detecting errors or malfunctions of the internal bias sources, power regulator, voltage reference, DAC output, die temperature, and optional external voltage source. If any fault is detected from the diagnostic ADC, CRC frame-error checking, or windowed watchdog timer, the devices can optionally issue an interrupt, enter a fail-safe state corresponding to a standard NAMUR output value or user-specified custom value, or both.

These devices operate from supplies as low as 1.71 V with a maximum quiescent current of 210 µA. The devices are specified over the temperature range of –40°C to +125°C, but are functional from –55°C to +125°C.

特性 Features

• Functional Safety-Capable
• Low quiescent current: 170 µA (typ)
• 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V
• 4-LSB INL at 16 bits
• 12-bit 3.84-kSPS ADC for advanced diagnostics
• Internal 1.2288-MHz oscillator with clock output
• Serial peripheral interface (SPI)
• Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADC
• Wide operating temperature: –55°C to +125°C