Electronic Components Datasheet Search |
|
MAX9718AETB+T Datasheet(PDF) 11 Page - Maxim Integrated Products |
|
MAX9718AETB+T Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 26 page Power Dissipation and Heat Sinking Under normal operating conditions, the MAX9718/ MAX9719 dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation: where TJ(MAX) is +150°C, TA is the ambient tempera- ture, and θJA is the reciprocal of the derating factor in °C/W as specified in the Absolute Maximum Ratings section. For example, θJA of the TQFN package is +59.2°C/W. The increase in power delivered by the BTL configura- tion directly results in an increase in internal power dis- sipation over the single-ended configuration. The maximum internal power dissipation for a given VCC and load is given by the following equation: If the internal power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by increasing the ground plane heat-sinking capability and the size of the traces to the device (see the Layout and Grounding section). Other methods for reducing power dissipation are to reduce VCC, increase load impedance, decrease ambi- ent temperature, reduce gain, or reduce input signal. Thermal-overload protection limits total power dissipa- tion in the MAX9718/MAX9719. When the junction tem- perature exceeds +160°C, the thermal protection circuitry disables the amplifier output stage. The ampli- fiers are enabled once the junction temperature cools by 15°C. A pulsing output under continuous thermal overload results as the device heats and cools. For optimum power dissipation and heat sinking, con- nect the exposed pad found on the µMAX, TDFN, TQFN, and TSSOP packages to a large ground plane. Fixed Differential Gain The MAX9718B/E, MAX9718C/F, MAX9718D/G, MAX9719B, MAX9719C, and MAX9719D feature inter- nally fixed gains (see the Selector Guide). This simpli- fies design, decreases required footprint size, and eliminates external gain-setting resistors. Resistors R1 and R2 shown in the Functional Diagrams are used to achieve each fixed gain. Adjustable Differential Gain Gain-Setting Resistors External feedback resistors set the gain of the MAX9718A/H and MAX9719A. Resistors RF and RIN (Figure 2) set the gain of the amplifier as follows: where AV is the desired voltage gain. Hence, an RIN of 10k Ω and an RF of 20kΩ yields a gain of 2V/V, or 6dB. RF can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. A R R V F IN = P V R D MAX CC L () = 2 2 2 π P TT D MAX J MAX A JA () () = − θ Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers ______________________________________________________________________________________ 11 +1 VOUT(P-P) 2 x VOUT(P-P) VOUT(P-P) -1 Figure 1. Bridge-Tied Load Configuration RF RF MAX9718A/H MAX9719A BIAS GENERATOR INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT (OPTIONAL) (OPTIONAL) IN+ IN- OUT+ OUT- RIN RIN Figure 2. Setting the MAX9718A/H/MAX9719A Gain |
Similar Part No. - MAX9718AETB+T |
|
Similar Description - MAX9718AETB+T |
|
|
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 |