Sirep: Newly Launched Ultra-Low Temperature Drift Precision Voltage Reference Module TPR70ULTC
Sirep 3PEAK has launched the ultra-low temperature-drift precision voltage reference module TPR70ULTC. Leveraging an innovative closed-loop temperature-control architecture, this product achieves precise control of the chip’s surface temperature across a wide operating range of –40°C to 80°C, reducing temperature drift to as low as 0.1 ppm/°C. This meets the stringent requirements of high-end instrumentation for highly stable voltage references and is well suited for precision measurement equipment and high-reliability applications.
I. Product Advantages of TPR70ULTC
1. Innovative Constant-Temperature Control Architecture
In response to the high temperature sensitivity of voltage reference chips, the TPR70ULTC employs a unique constant-temperature control design that uses power bipolar junction transistors (BJTs) to implement closed-loop heating of the PCB, thereby creating a “constant-temperature environment” for the internal voltage reference chip. Through this precise control, the system can dynamically adjust the thermal balance in real time, maintaining the chip’s surface temperature consistently around 80°C and effectively compensating for the impact of external ambient temperature fluctuations on the output voltage.
Figure 1: TPR70ULTC Closed-Loop Temperature Control Circuit
2. Ultra-low temperature drift performance
Leveraging an innovative constant-temperature control architecture, the TPR70ULTC delivers industry-leading temperature-drift suppression. In comprehensive environmental testing spanning –40°C to 80°C, the module’s typical temperature coefficient (TC) is only 0.2 ppm/°C. Test results demonstrate performance as low as 0.19 ppm/°C, significantly enhancing system measurement accuracy and long-term stability. Furthermore, for applications demanding ultra-high precision, Sirep can provide custom solutions with a TC as low as 0.1 ppm/°C.
Figure 2: Relationship between the output voltage of the TPR70ULTC and ambient temperature
3. Excellent long-term stability and thermal hysteresis performance
The TPR70ULTC module is meticulously designed to meet the stringent requirements of precision systems for repeatability and long-term reliability. In terms of long-term stability, the TPR70ULTC achieves a drift of just 10 ppm over 1,000 hours. Additionally, thermal hysteresis is a critical metric for assessing the ability of a voltage reference to recover after temperature cycling; the TPR70ULTC demonstrates outstanding stability even after undergoing thermal cycles ranging from −40°C to 80°C and back to room temperature. Test results show that the device’s output voltage stabilizes by the second cycle, significantly reducing the warm-up and stabilization time required for precision instruments operating in complex environments. Furthermore, the module incorporates a built-in soft-start function that limits the inrush current to below 300 mA, effectively mitigating system surge transients and ensuring reliable long-term operation.
Figure 3: Thermal Hysteresis Performance as a Function of Temperature Cycling (25°C → −40°C → 80°C → 25°C, First Cycle)
Figure 4: Relationship between Thermal Hysteresis and Temperature Cycling
4. Ultra-low noise output
In the low-frequency range of 0.1–10 Hz, the TPR70ULTC module features deep optimization to mitigate flicker noise (1/f noise) generated by the bandgap reference, achieving an exceptionally low noise performance of less than 5 µV/div. Additionally, users can add a high-capacitance bypass network at the VOUT pin to suppress broadband noise (10 Hz–10 kHz), further reducing the output noise.
Figure 5: Voltage Noise Characteristics in the 0.1–10 Hz Frequency Band
II. Product Features of TPR70ULTC
• Wide input voltage range: 9 V to 16 V;
• Low temperature coefficient: typical value of 0.2 ppm/°C (-40°C to 80°C);
• Thermal hysteresis: rapid convergence, achieving stability after just two cycles;
• Low-frequency noise (0.1–10 Hz): Noise output less than 5 µV/div, with bypass capacitor optimization supported.
III. Typical Applications of TPR70ULTC
The TPR70ULTC is specifically designed for high-precision test and measurement equipment and is widely used in digital multimeters, precision data acquisition systems, calibration instruments, automated test equipment, and other applications. Its ultra-low temperature drift ensures exceptional voltage reference stability, making it an ideal choice for high-precision instruments and meters—particularly in industrial settings and metrology laboratories where ambient temperatures can fluctuate significantly—thereby guaranteeing consistent measurement results.
Voltage reference chips are highly sensitive to temperature variations. The TPR70ULTC uses a power BJT to heat the PCB, creating a “constant-temperature environment” that ensures the voltage reference chip always operates at its specified optimal temperature, effectively disregarding drastic changes in ambient temperature and achieving ultra-low temperature drift.
Figure 6: TPR70ULTC Hardware Evaluation Board
(Source: Silipu official website)
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