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OP290GS Scheda tecnica(PDF) 8 Page - Analog Devices |
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OP290GS Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 12 page REV. A OP290 –8– 1 7 4 5 6 3 2 8 +18V –18V 100k 200 100k 1/2 OP290 1/2 OP290 Figure 2. Burn-In Circuit APPLICATIONS INFORMATION BATTERY-POWERED APPLICATIONS The OP290 can be operated on a minimum supply voltage of 1.6 V, or with dual supplies of 0.8 V, and draws only 19 pA of supply current. In many battery-powered circuits, the OP290 can be continuously operated for thousands of hours before requiring battery replacement, reducing equipment downtime and operating cost. High-performance portable equipment and instruments fre- quently use lithium cells because of their long shelf-life, light weight, and high energy density relative to older primary cells. Most lithium cells have a nominal output voltage of 3 V and are noted for a flat discharge characteristic. The low supply voltage requirement of the OP290, combined with the flat discharge characteristic of the lithium cell, indicates that the OP290 can be operated over the entire useful life of the cell. Figure 1 shows the typical discharge characteristic of a 1 Ah lithium cell power- ing an OP290 with each amplifier, in turn, driving full output swing into a 100 k Ω load. INPUT VOLTAGE PROTECTION The OP290 uses a PNP input stage with protection resistors in series with the inverting and noninverting inputs. The high breakdown of the PNP transistors coupled with the protection resistors provide a large amount of input protection, allowing the inputs to be taken 20 V beyond either supply without dam- aging the amplifier. SINGLE-SUPPLY OUTPUT VOLTAGE RANGE In single-supply operation the OP290’s input and output ranges include ground. This allows true “zero-in, zero-out” operation. The output stage provides an active pull-down to around 0.8 V above ground. Below this level, a load resistance of up to 1 MS2 to ground is required to pull the output down to zero. In the region from ground to 0.8 V, the OP290 has voltage gain equal to the data sheet specification. Output current source capa- bility is maintained over the entire voltage range including ground. +15V +15V –15V –15V V2 VIN 1k 9k 100 10k V1 20Vp-p @ 10Hz CHANNEL SEPARATION = 20 LOG V1 V2/1000 1/2 OP290 A 1/2 OP290 B OP37A Figure 3. Channel Separation Test Circuit APPLICATIONS TEMPERATURE TO 4–20 mA TRANSMITTER A simple temperature to 4–20 mA transmitter is shown in Figure 5. After calibration, the transmitter is accurate to +0.5 °C over the –50 °C to +150°C temperature range. The transmitter operates from 8 V to 40 V with supply rejection better than 3 ppm/V. One half of the OP290 is used to buffer the VTEMP pins while the other half regulates the output current to satisfy the current summation at its noninverting input. I VR R RR V RR R RR OUT TEMP SET = + () 67 210 26 7 210 – 100 80 0 0 60 40 20 3500 3000 2500 500 1000 2000 1500 HOURS Figure 4. Lithium Sulphur Dioxide Cell Discharge Characteristic with OP290 and 100 k Loads The change in output current with temperature is the derivative of the transfer function: ∆ ∆ ∆ ∆ I T V T RR RR OUT TEMP = + () 67 210 |
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