Electronic Components Datasheet Search |
|
NE5517DR2 Datasheet(PDF) 10 Page - ON Semiconductor |
|
NE5517DR2 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 15 page NE5517, NE5517A, AU5517 http://onsemi.com 10 Voltage-Controlled Resistor (VCR) Because an OTA is capable of producing an output current proportional to the input voltage, a voltage variable resistor can be made. Figure 26 shows how this is done. A voltage presented at the RX terminals forces a voltage at the input. This voltage is multiplied by gM and thereby forces a current through the RX terminals: Rx + R ) RA gM ) RA where gM is approximately 19.21 mMHOs at room temperature. Figure 27 shows a Voltage Controlled Resistor using linearizing diodes. This improves the noise performance of the resistor. Voltage-Controlled Filters Figure 28 shows a Voltage Controlled Low-Pass Filter. The circuit is a unity gain buffer until XC/gM is equal to R/RA. Then, the frequency response rolls off at a 6dB per octave with the −3 dB point being defined by the given equations. Operating in the same manner, a Voltage Controlled High-Pass Filter is shown in Figure 29. Higher order filters can be made using additional amplifiers as shown in Figures 30 and 31. Voltage-Controlled Oscillators Figure 32 shows a voltage-controlled triangle-square wave generator. With the indicated values a range from 2.0 Hz to 200 kHz is possible by varying IABC from 1.0 mA to 10 mA. The output amplitude is determined by IOUT × ROUT. Please notice the differential input voltage is not allowed to be above 5.0 V. With a slight modification of this circuit you can get the sawtooth pulse generator, as shown in Figure 33. APPLICATION HINTS To hold the transconductance gM within the linear range, IABC should be chosen not greater than 1.0 mA. The current mirror ratio should be as accurate as possible over the entire current range. A current mirror with only two transistors is not recommended. A suitable current mirror can be built with a PNP transistor array which causes excellent matching and thermal coupling among the transistors. The output current range of the DAC normally reaches from 0 to −2.0 mA. In this application, however, the current range is set through RREF (10 kW) to 0 to −1.0 mA. IDACMAX + 2 @ VREF RREF + 2 @ 5V 10kW + 1mA −VCC 4 3 − + NE5517/A 8 VOUT −VCC 11 +VCC RX 5 IO 2 R 7 INT INT C +VCC VC RX + R ) RA gM @ RA Figure 26. VCR 30kW 200W 200W 100kW 10kW −VCC 4 3 NE5517/A 8 −VCC 11 +VCC RX 5 ID 2 R 7 INT INT C +VCC VC +VCC VOS RP 1 6 Figure 27. VCR with Linearizing Diodes 30kW 1kW 100kW 10kW |
Similar Part No. - NE5517DR2 |
|
Similar Description - NE5517DR2 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |