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REF102 Datasheet(PDF) 5 Page - Texas Instruments |
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REF102 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 20 page  REF102 5 SBVS022B www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VS = +15V, unless otherwise noted. TYPICAL REF102 REFERENCE NOISE 6 4 2 0 −2 −4 −6 Low Frequency Noise (1s/div) (See Noise Test Circuit) – + OPA227 DUT Noise Test Circuit. 100 µF 15.8k Ω 20 Ω 2k Ω 8k Ω 2 µF Oscilloscope Gain = 100V/V f = 0.1Hz and 10Hz −3dB THEORY OF OPERATION Refer to the diagram on the first page of this data sheet. The 10V output is derived from a compensated buried zener diode DZ1, op amp A1, and resistor network R1 – R6. Approximately 8.2V is applied to the non-inverting input of A1 by DZ1. R1, R2, and R3 are laser-trimmed to produce an exact 10V output. The zener bias current is established from the regulated output voltage through R4. R5 allows user-trimming of the output voltage by providing for small external adjust- ment of the amplifier gain. Because the temperature coeffi- cient (TCR) of of R5 closely matches the TCR of R1, R2 and R3 , the voltage trim has minimal effect on the reference drift. The output voltage noise of the REF102 is dominated by the noise of the zener diode. A capacitor can be connected between the Noise Reduction pin and ground to form a low- pass filter with R6 and roll off the high-frequency noise of the zener. DISCUSSION OF PERFORMANCE The REF102 is designed for applications requiring a preci- sion voltage reference where both the initial value at room temperature and the drift over temperature are of importance to the user. Two basic methods of specifying voltage refer- ence drift versus temperature are in common usage in the industry—the butterfly method and the box method. The REF102 is specified by the more commonly-used box method. The box is formed by the high and low specification tempera- tures and a diagonal, the slope of which is equal to the maximum specified drift. Since the shape of the actual drift curve is not known, the vertical position of the box is not known, either. It is, however, bounded by VUPPER BOUND and VLOWER BOUND (see Figure 1). Figure 1 uses the REF102CU as an example. It has a drift specification of 2.5ppm/ °C maximum and a specification temperature range of –25 °C to +85°C. The box height, V1 to V2, is 2.75mV. REF102CU V UPPER BOUND +10.00275 V1 V NOMINAL +10.0000 2.75mV Worst-case ∆V OUT for REF102CU V2 +9.99725 REF102CU V LOWER BOUND −25 0 +25 +50 +85 Temperature ( °C) FIGURE 1. REF102CU Output Voltage Drift. |
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