SNAS393D March 2007 – November 2016 LME49720
PRODUCTION DATA.
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
These typical connection diagrams highlight the required external components and system level connections for proper operation of the device. Any design variation can be supported by TI through schematic and layout reviews. Visit e2e.ti.com for design assistance and join the audio amplifier discussion forum for additional information
For this design example, use the parameters listed in Table 1.
DESIGN PARAMETER | EXAMPLE VALUE |
---|---|
Power Supply | ±15 |
Speaker | 2 KΩ |
Temperature and applied DC voltage influence the actual capacitance of high-K materials. Table 2 shows the relationship between the different types of high-K materials and their associated tolerances, temperature coefficients, and temperature ranges. Notice that a capacitor made with X5R material can lose up to 15% of its capacitance within its working temperature range.
Select high-K ceramic capacitors according to the following rules:
Multiply the nominal value by a factor of 2 for safety. If a 10-µF capacitor is required, use 20µF.
The preceding rules and recommendations apply to capacitors used in connection with this device. The LME49720 cannot meet its performance specifications if the rules and recommendations are not followed.
Material | COG/NPO | X7R | X5R |
---|---|---|---|
Typical Tolerance | ±5% | ±10% | 80/–20% |
Temperature | ±30ppm | ±15% | 22/–82% |
Temperature Range, ºC | –55/125ºC | –55/125ºC | –30/85 ºC |
fo (Hz) | C1 | C2 | R1 | R2 |
---|---|---|---|---|
32 | 0.12μF | 4.7μF | 75kΩ | 500Ω |
64 | 0.056μF | 3.3μF | 68kΩ | 510Ω |
125 | 0.033μF | 1.5μF | 62kΩ | 510Ω |
250 | 0.015μF | 0.82μF | 68kΩ | 470Ω |
500 | 8200pF | 0.39μF | 62kΩ | 470Ω |
1k | 3900pF | 0.22μF | 68kΩ | 470Ω |
2k | 2000pF | 0.1μF | 68kΩ | 470Ω |
4k | 1100pF | 0.056μF | 62kΩ | 470Ω |
8k | 510pF | 0.022μF | 68kΩ | 510Ω |
16k | 330pF | 0.012μF | 51kΩ | 510Ω |