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MAX9724AEBC+T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX9724AEBC+T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page 60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown _______________________________________________________________________________________ 9 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 thin QFN package is +68°C/W, and 154.2°C/W for the UCSP package. The MAX9724A/MAX9724B have two power dissipation sources; a charge pump and the two output amplifiers. If power dissipation for a given application exceeds the maximum allowed for a particular package, reduce VDD, increase load impedance, decrease the ambient temperature, or add heatsinking to the device. Large output, supply, and ground traces decrease θJA, allow- ing more heat to be transferred from the package to the surrounding air. Thermal-overload protection limits total power dissipa- tion in the MAX9724A/MAX9724B. When the junction temperature exceeds +150°C, the thermal protection circuitry disables the amplifier output stage. The ampli- fiers are enabled once the junction temperature cools by approximately 12°C. This results in a pulsing output under continuous thermal-overload conditions. Output Dynamic Range Dynamic range is the difference between the noise floor of the system and the output level at 1% THD+N. Determine the system’s dynamic range before setting the maximum output gain. Output clipping occurs if the out- put signal is greater than the dynamic range of the sys- tem. The DirectDrive architecture of the MAX9724A/ MAX9724B has increased the dynamic range compared to other single-supply amplifiers. Maximum Output Swing VDD < 4.35V If the output load impedance is greater than 1k Ω, the MAX9724A/MAX9724B can swing within a few millivolts of their supply rail. For example, with a 3.3V supply, the output swing is 2VRMS, or 2.83V peak while maintaining a low 0.003% THD+N. If the supply voltage drops to 3V, the same 2.83V peak has only 0.05% THD+N. VDD > 4.35V Internal device structures limit the maximum voltage swing of the MAX9724A/MAX9724B when operated at supply voltages greater than 4.35V. The output must not be driven such that the peak output voltage exceeds the opposite supply voltage by 9V. For example, if VDD = 5V, the charge pump sets PVSS = -5V. Therefore, the peak output swing must be less than ±4V to prevent exceeding the absolute maximum ratings. UVLO The MAX9724A/MAX9724B feature an undervoltage lockout (UVLO) function that prevents the device from operating if the supply voltage is less than 2.7V. This fea- ture ensures proper operation during brownout condi- tions and prevents deep battery discharge. Once the supply voltage exceeds the UVLO threshold, the MAX9724A/MAX9724B charge pump is turned on and the amplifiers are powered, provided that SHDN is high. Component Selection Input-Coupling Capacitor The input capacitor (CIN), in conjunction with the input resistor (RIN), forms a highpass filter that removes the DC bias from an incoming signal (see the Functional Diagram/Typical Operating Circuits). The AC-coupling capacitor allows the device to bias the signal to an opti- mum DC level. Assuming zero-source impedance, the - 3dB point of the highpass filter is given by: Choose the CIN such that f-3dB is well below the lowest frequency of interest. Setting f-3dB too high affects the device’s low-frequency response. Use capacitors whose dielectrics have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with high-voltage coefficients, such as ceramics, can result in increased distortion at low frequencies. Charge-Pump Capacitor Selection Use ceramic capacitors with a low ESR for optimum performance. For optimal performance over the extend- ed temperature range, select capacitors with an X7R dielectric. Table 2 lists suggested manufacturers. f RC dB IN IN − = 3 1 2 π SUPPLIER PHONE FAX WEBSITE Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Murata 770-436-1300 770-436-3030 www.murata.com Table 2. Suggested Capacitor Manufacturers |
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