TSM6025

Page 8

TSM6025 Rev. 1.0

Output Voltage Hysteresis

Reference output voltage thermal hysteresis is the

change in the reference’s +25°C output voltage after

temperature cycling from +85°C to +25°C and from -

40°C to +25°C. Thermal hysteresis is caused by

differential package stress impressed upon the

TSM6025’s internal bandgap core transistors and

depends on whether the reference IC was previously

at a higher or lower temperature. At 130ppm, the

TSM6025’s typical temperature hysteresis is equal

to 0.33mV with respect to a 2.5V output voltage.

Voltage Reference Turn-On Time

combined turn-on and settling time to within 0.1% of

its 2.5V final value is approximately 340

μs.

A Positive and Negative Low-Power Voltage

Reference

The circuit in Figure 1 uses a CD4049 hex inverter

and a few external capacitors as the power supply to

a dual-supply precision op amp to form a ±2.5V

precision, bipolar output voltage reference around

the TSM6025. The CD4049-based circuit is a

discrete charge pump voltage doubler/inverter that

generates ±6V supplies for any industry-standard

OP-07 or equivalent precision op amp.

Figure 1: Positive and Negative 2.5V References from a Single +3V or +5V Supply