1 Features

? Functional Safety-Capable

– Documentation available to aid functional safety

system design: AFE88101, AFE78101

? Low quiescent current: 170 μA (typ)

? 16-bit or 14-bit monotonic high-performance DAC

– 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V

– 5-V supply: 0.3 V to 2.5 V, 0.4 V to 2.0 V

– 4-LSB INL at 16 bits

– 0.07 FSR (max) TUE from –40°C to +125°C

? 12-bit 3.84-kSPS ADC for advanced diagnostics

? Integrated 1.25-V reference at 10 ppm/°C

? Internal 1.2288-MHz oscillator with clock output

? Digital interfaces:

– Serial peripheral interface (SPI)

– Universal asynchronous receiver-transmitter

(UART)

? Fault detection: CRC bit error checking, windowed

watchdog timer, diagnostic ADC

? Wide operating temperature: –55°C to +125°C

2 Applications

? 2-wire transmitters

? 4-mA to 20-mA loop-powered applications

? Process control and industrial automation

? Smart transmitters

? PLC or DCS I/O modules

3 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 sensortransmitter

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 analogto-

digital converter (ADC). To accommodate intrinsic

and functional-safety concerns, external voltage-tocurrent

conversion and power regulation are required.

The internal diagnostic ADC is multiplexed to

several internal nodes that enable an automatic selfhealth

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.

TLVH431B屬于集成電路（IC） > 電壓基準。美國德州儀器公司制造生產(chǎn)的TLVH431B電壓基準產(chǎn)品屬于基準電壓源系列，可通過相對較不穩(wěn)定的電源提供穩(wěn)定的電勢，電壓值始終保持恒定，以便在測量、控制和類似應(yīng)用中用作比較的標準。其功能行為可能與用于大功率調(diào)節(jié)的線性穩(wěn)壓器相似，但基準電壓源器件卻不適合用于此類用途。用作比較標準時，若輸出電流容量或?qū)嶋H負載電流增大，其性能通常會降低。