Motore di ricerca datesheet componenti elettronici |
|
AD8542AR-REEL7 Scheda tecnica(PDF) 10 Page - Analog Devices |
|
AD8542AR-REEL7 Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 16 page AD8541/AD8542/AD8544 –10– REV. D much easier and/or less expensive to accomplish in the FNDR circuit. For example, the Twin-T notch uses three capacitors with two unique values, whereas the FNDR circuit uses only two capacitors, which may be of the same value. U3 is simply a buffer that is added to lower the output impedance of the circuit. 4 f = R2C2 L = C2 1 F 1/4 AD8544 11 6 1/4 AD8544 1/4 AD8544 10 8 9 C1 1 F 1 2 p LC1 R 2.61k R1 Q ADJUST 200 VOUT 2.5VREF 2 1 3 1/4 AD8544 R 2.61k 12 14 13 NC 2.5VREF SPARE 5 7 R 2.61k R 2.61k 2.5VREF U3 U2 U1 U4 Figure 3. FNDR 60 Hz Notch Filter with Output Buffer Comparator Function A comparator function is a common application for a spare op amp in a quad package. Figure 4 illustrates 1/4 of the AD8544 as a comparator in a standard overload detection application. Unlike many op amps, the AD854x family can double as comparators because this op amp family has rail-to-rail differential input range, rail-to-rail output, and a great speed versus power ratio. R2 is used to introduce hysteresis. The AD854x, when used as comparators, have 5 ms propagation delay at 5 V and 5 ms overload recovery time. R1 1k VOUT 2.5VREF VIN 1/4 AD8544 2.5VDC R2 1M Figure 4. AD854x Comparator Application–Overload Detector Photodiode Application The AD854x family has very high impedance with input bias current typically around 4 pA. This characteristic allows the AD854x op amps to be used in photodiode applications and other applications that require high input impedance. Note that the AD854x has significant voltage offset, which can be removed by capacitive coupling or software calibration. Figure 5 illustrates a photodiode or current measurement application. The feedback resistor is limited to 10 M W to avoid excessive output offset. Also, note that a resistor is not needed on the noninverting input to cancel bias current offset because the bias current related output offset is not significant when compared to the voltage offset contribution. For the best performance follow the standard high impedance layout techniques including: ∑ Shield the circuit. ∑ Clean the circuit board. ∑ Put a trace connected to the noninverting input around the inverting input. ∑ Use separate analog and digital power supplies. AD8541 4 6 7 3 2 VOUT 2.5VREF R 10M C 100pF D 2.5VREF OR V+ Figure 5. High Input Impedance Application–Photodiode Amplifier |
Codice articolo simile - AD8542AR-REEL7 |
|
Descrizione simile - AD8542AR-REEL7 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore 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 |