Motore di ricerca datesheet componenti elettronici |
|
AD8592ARM Scheda tecnica(PDF) 10 Page - Analog Devices |
|
AD8592ARM Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 15 page AD8591/AD8592/AD8594 –10– REV. A If gain is required from the output amplifier, four additional resistors should be added as shown in Figure 35. The gain of the AD8592 can be set as: A R R V = 7 6 (5) U1-A R2 2k 4 C1 100 F +5V 1 10 2 3 5 +5V VDD VDD LEFTOUT AD1881 (AC97) RIGHTOUT VSS R4 20 +5V R1 100k 7 8 6 9 R5 20 C2 100 F NOTE: ADDITIONAL PINS OMITTED FOR CLARITY U1-B U1 = AD8592 R3 2k R7 20k R7 20k VREF R6 10k R6 10k AV = = +6dB WITH VALUES SHOWN R7 R6 NC 38 35 27 36 Figure 35. A PC-98 Compliant Headphone/Line Out Amplifier With Gain Input coupling capacitors are not required for either circuit as the reference voltage is supplied from the AD1881. R4 and R5 help protect the AD8592 output in case the output jack or headphone wires accidentally get shorted to ground. The output coupling capacitors C1 and C2 block dc current from the headphones and create a high-pass filter with a corner frequency of: f CR R dB L –3 1 21 4 = + () π (6) Where RL is the resistance of the headphones. A Combined Microphone and Speaker Amplifier for Cellphone and Portable Headsets The dual amplifiers in the AD8592 make an efficient design for interfacing with a headset containing a microphone and speaker. Figure 36 demonstrates a simple method for constructing an interface to a codec. U1-A 4 +5V 1 10 2 3 5 C2 10 F U1 = AD8592 7 8 6 9 R5 10k U1-B R6 10k (OPTIONAL) R4 10k FROM CODEC MONO OUT (OR LEFT OUT) TO CODEC R3 100k VREF FROM CODEC MIC + SPEAKER JACK R1 2.2k +5V R2 10k R8 100k +5V C1 0.1 F NC (RIGHT OUT) R7 1k Figure 36. A Speaker/Mic Headset Amplifier Circuit U1-A is used as a microphone preamplifier, where the gain of the preamplifier is set as R3/R2. R1 is used to bias an electret microphone and C1 blocks any dc voltages from the amplifier. U1-B is the speaker amplifier, and its gain is set at R5/R4. To sum a stereo output, R6 should be added, equal in value to R4. Using the same principle as described in the previous section, the normalizing contact on the microphone/speaker jack can be used to put the AD8592 into shutdown when the headset is not plugged in. The AD8592 shutdown inputs can also be con- trolled with TTL or CMOS compatible logic, allowing micro- phone or speaker muting if desired. An Inexpensive Sample-and-Hold Circuit The independent shutdown control of each amplifier in the AD8592 allows a degree of flexibility in circuit design. One par- ticular application for which this feature is useful is in designing a sample-and-hold circuit for data acquisition. Figure 37 shows a schematic of a simple, yet extremely effective sample-and-hold circuit using a single AD8592 and one capacitor. VIN U1-A C1 1nF U1-B SAMPLE AND HOLD OUTPUT +5V 1 2 3 5 9 8 7 6 SAMPLE CLOCK U1 = AD8592 +5V 4 10 Figure 37. An Efficient Sample-and-Hold Circuit |
Codice articolo simile - AD8592ARM |
|
Descrizione simile - AD8592ARM |
|
|
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 |