Overview
The REF7025QFKHT is a high-precision voltage reference from Texas Instruments, part of the REF70 family. It is renowned for its ultra-low noise, low temperature drift, and high accuracy, making it ideal for applications requiring precise voltage references. This component is particularly suited for test and measurement, precision data acquisition, and noise-sensitive medical applications such as ultrasound and X-ray systems.
The REF7025QFKHT offers a hermetically sealed ceramic package (LCCC) that ensures low long-term drift and stability over a wide temperature range of −40°C to +125°C. This makes it a reliable choice for industrial and medical applications where precision and stability are critical.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Output Voltage Accuracy | TA = 25°C | −0.025 | 0.025 | % | |
| Output Voltage Temperature Coefficient | −40°C ≤ TA ≤ 125°C | 2 | ppm/°C | ||
| Low Frequency Noise (1/f Noise) | 0.1 Hz to 10 Hz | 0.23 | ppm p-p | ||
| Output Voltage Noise | 10 Hz to 1 kHz | 0.35 | ppm rms | ||
| Input Voltage Range | 2.75 | 18 | V | ||
| Output Current Range | −10 | 10 | mA | ||
| Dropout Voltage | IL = 10 mA | 400 | mV | ||
| Power Supply Rejection Ratio (PSRR) | At 1 kHz | 107 | dB | ||
| Operating Temperature Range | −40 | 125 | °C |
Key Features
- Ultra-Low Noise: 0.23 ppm p-p (0.1 Hz to 10 Hz) and 0.35 ppm rms (10 Hz to 1 kHz) for precise measurements.
- Low Temperature Drift: Maximum of 2 ppm/°C over the operating temperature range.
- High Accuracy: ±0.025% maximum output voltage accuracy.
- High PSRR: 107 dB at 1 kHz for excellent noise rejection.
- Low Dropout Voltage: 400 mV at 10 mA output current.
- Flexible Output Capacitor Range: Stable with 1-µF to 100-µF output low-ESR capacitor.
- Hermetically Sealed Package: LCCC (FKH) package for low long-term drift and stability.
- Wide Input Voltage Range: Up to 18 V, making it suitable for various applications.
Applications
- Test and Measurement: Ideal for precision data acquisition systems and semiconductor test equipment.
- Medical Applications: Suitable for noise-sensitive applications such as ultrasound and X-ray systems.
- Industrial Instrumentation: Used in precision weight scales, PLC analog I/O modules, field transmitters, and power monitoring systems.
- High-Resolution Data Converters: Paired with precision data converters like ADS8900B, ADS127L01, and DAC11001A for optimal performance.
Q & A
- What is the typical noise performance of the REF7025QFKHT?
The REF7025QFKHT has a low frequency noise of 0.23 ppm p-p (0.1 Hz to 10 Hz) and an output voltage noise of 0.35 ppm rms (10 Hz to 1 kHz).
- What is the temperature drift coefficient of the REF7025QFKHT?
The temperature drift coefficient is a maximum of 2 ppm/°C over the operating temperature range of −40°C to +125°C.
- What is the output voltage accuracy of the REF7025QFKHT?
The output voltage accuracy is ±0.025% maximum at 25°C.
- What is the power supply rejection ratio (PSRR) of the REF7025QFKHT?
The PSRR is 107 dB at 1 kHz.
- What is the dropout voltage of the REF7025QFKHT?
The dropout voltage is 400 mV at an output current of 10 mA.
- What are the package options available for the REF7025QFKHT?
The REF7025QFKHT is available in a hermetically sealed ceramic package (LCCC) and a VSSOP package.
- What is the operating temperature range of the REF7025QFKHT?
The operating temperature range is −40°C to +125°C.
- What are some typical applications of the REF7025QFKHT?
Typical applications include test and measurement, precision data acquisition systems, medical applications like ultrasound and X-ray, and industrial instrumentation.
- Can the REF7025QFKHT be used with high-resolution data converters?
Yes, it is designed to be paired with precision, high-resolution data converters such as ADS8900B, ADS127L01, and DAC11001A.
- What is the input voltage range of the REF7025QFKHT?
The input voltage range is from 2.75 V to 18 V.
