REF5025IDR IC

Technical Specifications of REF5025IDR

Datasheet	REF5025IDR datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Reference
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Reference Type	Series
Output Type	Fixed
Voltage – Output (Min/Fixed)	2.5V
Voltage – Output (Max)	–
Current – Output	10mA
Tolerance	±0.05%
Temperature Coefficient	3ppm/°C
Noise – 0.1Hz to 10Hz	3μVp-p
Noise – 10Hz to 10kHz	–
Voltage – Input	2.7 V ~ 18 V
Current – Supply	1.2mA
Current – Cathode	–
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SOIC

REF5025IDR Description

The REF50xx is a group of ultra-precise voltage references that provide low noise and drift. Excellent line and load regulation allow these references to function as both sinks and sources of current. We could use advanced design methods to reduce temperature drift to 3 ppm/°C while maintaining a high degree of accuracy (0.05%). The REF50xx family is well suited for high-precision data-gathering systems due to its combination of these capabilities with extremely low noise. High-grade (REF50xxIDGK) and standard-grade (REF50xxID) versions of every reference voltage are also on hand (REF50xxAIDGK and REF50xxAID). Both 8-pin VSSOP and SOIC packages are available for these reference voltages, with a temperature range of -40 to 125 degrees Celsius.

REF5025IDR Features

Low-temperature drift

• Maximum quality: 3 ppm/°C (maximum)
• 8 ppm/°C is the standard quality (maximum)

High accuracy

• Maximum purity: 0.05% (maximum)
• At the minimum, 0.1% must be standard (maximum)

Low noise: 3 μVPP/V

Excellent long-term stability

• 50 ppm/1000 hr (typical) first 1000 hours (VSSOP)
• 25 ppm/1000 hr (typical) second 2000 hours (VSSOP)
• High-output current: ±10 mA
• Temperature range: –40°C to 125°C
• Parameter Measurement Information

Solder Heat Shift

Since the components that make up the REF50xx are made from materials with varying coefficients of thermal expansion, the device die experiences strain whenever the component in question is heated. The product’s initial accuracy and drift parameters can be degraded due to the device being subjected to mechanical and thermal stress, which can cause the output voltages to move. This problem frequently occurs as a result of reflow soldering.

Detailed Description

The REF50xx is a set of low-noise, precision band-gap voltage references specifically built for outstanding initial voltage accuracy and drift. These references are part of a larger product line known as the REF50xx.

Noise Performance

The output voltage and the temperature at which the device is being operated contribute to an increase in the noise voltage. Additional filtering can be applied to reduce the amount of noise produced by the output; however, caution is needed to ensure that the output impedance does not negatively impact performance.

Long-Term Stability

Throughout their lifetimes, all semiconductor devices undergo a process of physical ageing caused by the effects of both time and the environment. This process affects both the semiconductor die and the packaging material. Because of these changes and the associated stress that the packaging places on the die, the output voltage of precision voltage references will deviate throughout their useful lives. In the datasheet, there is a parameter referred to as the long-term stability, also referred to as long-term drift (LTD). This parameter’s value specifies how much this change will occur over time.

Device Functional Modes

Basic Connections

A supply bypass capacitor with a value between 1 and 10 microfarads is what Texas Instruments suggests using. From the output terminal (VOUT), a capacitor with a value between 1 and 50 microfarads (CL) needs to be connected to GND. To maintain consistent output, CL’s equivalent series resistance (ESR) value must be either less than or equal to 1.5 ohms. To achieve the best results in terms of noise reduction, it is recommended that the ESR of CL be between 1 and 1.5.

Application Information

Supply Voltage

The voltage references that belong to the REF50xx family have an exceptionally low dropout voltage. Except for the REF5020, which requires a minimum supply voltage of 2.7 V, these references can be operated with a supply of 200 mV greater than the output voltage when unloaded. The REF5020 has a minimum supply voltage need of 2.7 V.

The accuracy of data-collecting systems is frequently dependent on the availability of steady voltage references. Excellent-performance data converters can be found in the REF50xx series, distinguished by its low noise, very low drift, and high initial precision.

Design Requirements

Choose an appropriate output capacitor when utilizing the REF50xx in the design. This will ensure that gain peaking is not produced, which would lead to an increase in total system noise. At the same time, the capacitor has to be chosen so that it can supply the system with the necessary level of filtering performance. In addition, an input bypass capacitor and noise reduction capacitor need to be included for the performances to be at their best. During designing the data acquisition system, equal consideration must be given to both the buffering analog input signal and the reference voltage. Both of these aspects are essential to the functioning of the system. The data acquisition system must fulfil the criteria of possessing a well-designed input buffer and an accompanying RC filter to achieve the desired level of performance.

Detailed Design Procedure

The OPA365 drives the 16-bit analogue-to-digital converter when it’s put to work (ADS8326). The charge kickback caused when the sampling switch inside the ADC is opened and closed can be mitigated with the help of the RC filter that is located at the output of the OPA365. Construct the RC filter so that it takes the voltage at the sampling capacitor no longer than the period allotted by the ADC to settle down to 16 bits of precision. At the very least, the bandwidth of the driving amplifier needs to be four times greater than the bandwidth of the RC filter.

For driving the REF pin of the ADS8326, the REF5040 is the component of choice. Getting the choice of voltage reference output capacitor right is one of the most critical things you can do for this design. Gain-peaking is caused by low equivalent series resistance (ESR), which lowers the system’s overall signal-to-noise ratio (SNR). If the equivalent series resistance of the capacitor is insufficient, an additional resistor must be placed in series with the output capacitor. The band-gap noise of the REF50xx can be reduced by connecting a capacitor with a value of 1 microfarad to the NR pin.

Conclusion

The dropout voltage is very small in the REF50xx family of voltage references. Except for the REF5020, these references can be used with a supply that is only 200 mV higher than the output voltage when not under load.

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