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REF193GSZ Datasheet(PDF) 24 Page - Analog Devices |
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REF193GSZ Datasheet(HTML) 24 Page - Analog Devices |
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24 / 28 page  REF19x Series Rev. I | Page 24 of 28 For VS levels lower than the lower threshold, U3 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 to R3 values, as shown in Figure 30, lower/upper VS switching thresholds are approximately 5.5 V and 6 V, respectively. These can be changed to suit other VS supplies, as can the REF19x devices used for U1 and U2, over a range of 2.5 V to5 V of output. U3 can operate down to a VS of 3.3 V, which is generally compatible with all REF19x family devices. LOW POWER, STRAIN GAGE CIRCUIT As shown in Figure 31, the REF19x family of references can be used in conjunction with low supply voltage operational amplifiers, such as the OP492 or the OP283, in a self-contained strain gage circuit in which the REF195 is used as the core. Other references can be easily accommodated by changing circuit element values. The references play a dual role, first as the voltage regulator to provide the supply voltage requirements of the strain gage and the operational amplifiers, and second 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. 500Ω 0.1% 57kΩ 1% 0.1µF 10kΩ 1% 0.1µF 1/4 OP492 10µF REF195 2.21kΩ 20kΩ 1% 10kΩ 1% 20kΩ 1% 20kΩ 1% 20kΩ 1% 0.01µF 10µF 100Ω OUTPUT 2N2222 + 1µF + 6 2 4 + – 1 4 11 2 3 1/4 OP492 + – 7 5 6 1/4 OP492 + – 14 12 13 1/4 OP492 + – 8 10 9 10kΩ 1% Figure 31. A Low Power, Strain Gage Circuit |
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