Texas Instruments REF6200 高精度电压基准

Texas Instruments REF6200 高精度电压基准有一个集成式低输出阻抗缓冲器，使用户能够直接驱动精密数据转换器的基准 (REF) 引脚。不仅如此，还可同时保持线性度、失真和噪声性能。最精密 SAR 和 Σ-Δ 模数转换器 (ADC)，在转换过程中将二进制加权电容器切换到 REF 引脚上。为了支持这种动态负载，电压基准的输出必须用低输出阻抗、高带宽缓冲器进行缓冲。这些器件非常适合但不限于，驱动 ADS88xx 系列 SAR 数模转换器、ADS127xx 系列 Δ-Σ 数模转换器以及精密数模转换器的 REF 引脚。

In order to support this dynamic load, the output of the voltage reference must be buffered with a low-output impedance, high-bandwidth buffer. These devices are well suited, but not limited, to drive the REF pin of the ADS88xx family of SAR ADCs, and ADS127xx family of delta-sigma ADCs, as well as precision digital-to-analog converters (DACs).

特性

Excellent temperature drift performance
- 3ppm/°C (max) from 0°C to +70°C
Extremely low noise
- Total noise (5µV_RMS with 47µF capacitor)
- 1/f noise (0.1Hz to 10Hz) (3µVPP/V)
Integrated ADC drive buffer
- < 50mΩ (0-200kHz) low output impedance
- First sample precise to 18 bits with ADS8881
- Enables burst-mode DAQ systems
820µA low supply current

1µA low shutdown current
±0.05% high initial accuracy
Very low noise and distortion
- SNR: 100.5dB, THD: –125dB (ADS8881)
- SNR: 106dB, THD: –120dB (ADS127L01)
±4mA output current drive
Programmable short-circuit current
Verified to drive REF pin of ADS88xx family of SAR ADCs and ADS127xx family of wideband ΔΣ ADCs