REF20XX中文资料德州仪器数据手册PDF规格书

1 Features

• 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:

– 6 ppm/°C (maximum) from –40°C to 85°C

– 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

• Matte-Sn version (REF2025AISDDCR) for

improved corrosion resistance in the Battelle Class

III and similar harsh environments

2 Applications

• Electricity meter

• Analog input module

• Analog output module

• Servo drive control module

• Circuit breaker (ACB, MCCB, VCB)

• Clinical digital thermometer

• Lab & field instrumentation

• Battery test

3 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 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 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 6 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 industrial applications.