 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TPA6204A1 Datasheet(PDF) 10 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
TPA6204A1 Datasheet(HTML) 10 Page - Texas Instruments |
|
|
10 / 18 page  TPA6204A1 SLOS429 − MAY 2004 www.ti.com 10 SELECTING COMPONENTS Resistors (RI) The input resistor (RI) can be selected to set the gain of the amplifier according to equation 1. Gain = RF/RI The internal feedback resistors (RF) are trimmed to 40 kΩ. Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and the cancellation of the second harmonic distortion diminishes if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. USING LOW-ESR CAPACITORS Low-ESR capacitors are recommended throughout this applications section. A real (as opposed to ideal) capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance the more the real capacitor behaves like an ideal capacitor. Bypass Capacitor (CBYPASS) and Start-Up Time The internal voltage divider at the BYPASS pin of this device sets a mid-supply voltage for internal references and sets the output common mode voltage to VDD/2. Adding a capacitor to this pin filters any noise into this pin and increases kSVR. C(BYPASS) also determines the rise time of VO+ and VO− when the device is taken out of shutdown. The larger the capacitor, the slower the rise time. NO TAGNO TAGNO TAGNO TAGNO TAG show the relationship of C(BYPASS) to start-up time. Input Capacitor (CI) The TPA6204A1 does not require input coupling capacitors if using a differential input source that is biased from 0.5 V to VDD − 0.8 V. Use 1% tolerance or better gain-setting resistors if not using input coupling capacitors. In the single-ended input application an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper dc level. In this case, CI and RI form a high-pass filter with the corner frequency determined in equation 2. fc + 1 2 pR I C I −3 dB fc The value of CI is important to consider as it directly affects the bass (low frequency) performance of the circuit. Consider the example where RI is 10 kΩ and the specification calls for a flat bass response down to 100 Hz. Equation 2 is reconfigured as equation 3. C I + 1 2 pR I fc In this example, CI is 0.16 µF, so one would likely choose a value in the range of 0.22 µF to 0.47 µF. Ceramic capacitors should be used when possible, as they are the best choice in preventing leakage current. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/2, which is likely higher than the source dc level. It is important to confirm the capacitor polarity in the application. Decoupling Capacitor (CS) The TPA6204A1 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series- resistance (ESR) ceramic capacitor, typically 0.1 µF to 1 µF, placed as close as possible to the device VDD lead works best. For filtering lower frequency noise signals, a 10- µF or greater capacitor placed near the audio power amplifier also helps, but is not required in most applications because of the high PSRR of this device. (1) (2) (3) |
Similar Part No. - TPA6204A1_07 |
|
Similar Description - TPA6204A1_07 |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
