REF1933AIDDCTG4.B中文资料德州仪器数据手册PDF规格书

1 Features

1• Two Outputs, VREF and VREF / 2, for Convenient

Use in Single-Supply Systems

• Excellent Temperature Drift Performance:

– 25 ppm/°C (max) from –40°C to 125°C

• High Initial Accuracy: ±0.1% (max)

• VREF and VBIAS Tracking over Temperature:

– 6 ppm/°C (max) from –40°C to 85°C

– 7 ppm/°C (max) 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

2 Applications

• Digital Signal Processing:

– Power Inverters

– Motor Controls

• Current Sensing

• Industrial Process Controls

• Medical Equipment

• Data Acquisition Systems

• Single-Supply Systems

3 Description

Applications with only a positive supply voltage often

require an additional stable voltage in the middle of

the analog-to-digital converter (ADC) input range to

bias input bipolar signals. The REF19xx 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 REF19xx offers excellent temperature drift

(25 ppm/°C, max) and initial accuracy (0.1%) 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 6 ppm/°C (max) across the temperature

range of –40°C to 85°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 industrial applications.