Electronic Components Datasheet Search |
|
OP497 Datasheet(PDF) 8 Page - Analog Devices |
|
OP497 Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page REV. D OP497 –8– OPEN-LOOP GAIN LINEARITY The OP497 has both an extremely high gain of 2000 V/mv mini- mum and constant gain linearity. This enhances the precision of the OP497 and provides for very high accuracy in high closed-loop gain applications. Figure 5 illustrates the typical open-loop gain linearity of the OP 497 over the military temperature range. 15 –10 –15 10 5 0 –5 OUTPUT VOLTAGE – Volts RL = 10k VS = 15V VCM = 0V TA = +25C TA = –55 C TA = +125 C Figure 5. Open-Loop Linearity of the OP497 APPLICATIONS Precision Absolute Value Amplifier The circuit of Figure 6 is a precision absolute value amplifier with an input impedance of 30 M Ω. The high gain and low TCVOS of the OP497 ensure accurate operation with microvolt input signals. In this circuit, the input always appears as a com- mon-mode signal to the op amps. The CMR of the OP497 exceeds 120 dB, yielding an error of less than 2 ppm. +15V 2 3 VIN –15V 4 C3 0.1 F 8 1 6 5 7 0V < V < 10V OUT D1 1N4148 R3 1k R1 1k C2 0.1 F C1 30pF D2 1N4148 R2 2k 1/4 OP497 1/4 OP497 Figure 6. Precision Absolute Value Amplifier PRECISION CURRENT PUMP Maximum output current of the precision current pump shown in Figure 7 is ±10 mA. Voltage compliance is ±10 V with ±15 V supplies. Output impedance of the current transmitter exceeds 3 M Ω with linearity better than 16 bits. 2 3 1 7 8 5 6 4 –15V +15V IOUT 10mA – + VIN IOUT = = = 10mA/ V VIN R5 VIN 100 R1 10k R2 10k R4 10k R3 10k R5 10k 1/4 OP497 1/4 OP497 Figure 7. Precision Current Pump PRECISION POSITIVE PEAK DETECTOR In Figure 8, the CH must be of polystyrene, Teflon *, or polyeth- ylene to minimize dielectric absorption and leakage. The droop rate is determined by the size of CH and the bias current of the OP497. 2 3 1 7 8 5 6 4 –15V +15V 1N4148 2N930 CH RESET VIN VOUT 1k 1k 1k 1k 0.1 F 0.1 F 1/4 OP497 1/4 OP497 Figure 8. Precision Positive Peak Detector SIMPLE BRIDGE CONDITIONING AMPLIFIER Figure 9 shows a simple bridge conditioning amplifier using the OP497. The transfer function is: VV R RR R R OUT REF F = + ∆ ∆ The REF43 provides an accurate and stable reference voltage for the bridge. To maintain the highest circuit accuracy, RF should be 0.1% or better with a low temperature coefficient. *Teflon is a registered trademark of the Dupont Company. |
Similar Part No. - OP497 |
|
Similar Description - OP497 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |