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REF192 Datasheet(PDF) 22 Page - Analog Devices |
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REF192 Datasheet(HTML) 22 Page - Analog Devices |
22 / 24 page ![]() REV. E –22– REF19x Series For VS levels lower than the LOWER threshold, U3’s output is low, thus U2 and Q1 are OFF, while U1 is ON. For VS levels higher than the UPPER threshold, the situation reverses, with U1 OFF and both U2 and Q1 ON. In the interest of battery power conservation, all of the comparison switching circuitry is powered from VS and is arranged so that when VS fails, the default output comes from U1. For the R1–R3 values as shown, the LOWER/UPPER VS switching thresholds are approximately 5.5 V and 6 V, respectively. These can obviously be changed to suit other VS supplies, as can the REF19x devices used for U1 and U2, over a range of 2.5 V to 5V of output. U3 can operate down to a VS of 3.3 V, which is generally compatible with all family devices. A Low Power, Strain Gage Circuit As shown in Figure 12, the REF19x family of references can be used in conjunction with low supply voltage operational amplifi- ers, such as the OP492 and the OP283, in a self-contained strain gage circuit. In this circuit, the REF195 was used as the core of this low power, strain gage circuit. Other references can be easily accommodated by changing circuit element values. The references play a dual role as the voltage regulator to provide the supply voltage requirements of the strain gage and the operational amplifiers as well as a precision voltage reference for the current source used to stimulate the bridge. A distinct feature of the circuit is that it can be remotely controlled ON or OFF by digital means via the SLEEP pin. 500 0.1% 57k 1% 0.1 F 10k 1% 0.1 F 1/4 OP492 10 F 1 F REF195 1/4 OP492 1/4 OP492 1/4 OP492 2.21k 20k 1% 10k 1% 20k 1% 20k 1% 0.01 F 10 F 100 OUTPUT 2N2222 20k 1% 10k 1% Figure 12. A Low Power, Strain Gage Circuit |
Similar Part No. - REF192 |
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Similar Description - REF192 |
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