Texas Instruments REF60xx/REF61xx 高精度电压基准

Texas Instruments REF60xx/REF61xx 高精度电压基准是一系列集成了低输出阻抗缓冲器的电压基准。该缓冲器使用户能够直接驱动精密数据转换器的 REF 引脚，同时保持线性度、失真和噪声性能。最精密 SAR 和 Σ-Δ 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。 REF60xx/REF61xx 系列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 数模转换器以及其他数模转换器的 REF 引脚。

特性

Excellent temperature drift performance
- REF60xx: 5ppm/°C (max) from –40°C to +125°C
- REF61xx: 8ppm/°C (max) from –40°C to +125°C
Extremely low noise
- 5µVRMS with 47µF capacitor total noise
- 3µVPP/V 1/f noise (0.1Hz to 10Hz)
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