REF20-Q1数据手册TI中文资料规格书

描述 Description

Applications with only a positive supply voltage often require additional stable voltage in the middle of the analog-to-digital converter (ADC) input range to bias input bipolar signals. The REF20xx-Q1 provides a reference voltage (VREF) for the ADC and a second highly-accurate voltage (VBIAS) that can be used to bias the input bipolar signals.

The REF20xx-Q1 offers excellent temperature drift (8 ppm/°C, maximum) and initial accuracy (0.05%) on both the VREF and VBIAS outputs while operating at a quiescent current less than 430 µA. In addition, the VREF and VBIAS outputs track each other with a precision of 7 ppm/°C (maximum) across the temperature range of –40°C to 125°C. All these features increase the precision of the signal chain and decrease board space, while reducing the cost of the system as compared to a discrete solution. Extremely low dropout voltage of only 10 mV allows operation from very low input voltages, which can be very useful in battery-operated systems.

Both the VREF and VBIAS voltages have the same excellent specifications and can sink and source current equally well. Very good long-term stability and low noise levels make these devices ideally-suited for high-precision applications.

特性 Features

• AEC-Q100 qualified with the following results:
• Device temperature grade 1: –40°C to +125°C ambient operating temperature
• Device HBM ESD classification level 2
• Device CDM ESD classification level C7B

• Functional Safety-Capable
• Documentation available to aid functional safety system design

• Two Outputs, VREF and VREF / 2, for convenient use in single-supply systems
• Excellent temperature drift performance:
• 8 ppm/°C (maximum) from –40°C to 125°C

• High initial accuracy: ±0.05% (maximum)
• VREF and VBIAS tracking overtemperature:
• 7 ppm/°C (maximum) from –40°C to 125°C

• Microsize package: SOT23-5
• Low dropout voltage: 10 mV
• High output current: ±20 mA
• Low quiescent current: 360 µA
• Line regulation: 3 ppm/V
• Load regulation: 8 ppm/mA