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MAX13331GEET Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX13331GEET Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Automotive DirectDrive Headphone Amplifiers with Output Protection and Diagnostics 8 _______________________________________________________________________________________ Detailed Description The MAX13330/MAX13331 headphone amplifiers fea- ture Maxim’s DirectDrive architecture, eliminating the large output-coupling capacitors required by conven- tional single-supply headphone amplifiers. The devices consists of two Class AB headphone amplifiers, under- voltage lockout (UVLO), low-power shutdown control, comprehensive click-and-pop suppression, output short-circuit/ESD protection and output short-circuit diagnostics. These devices can drive loads as low as 8 Ω, and deliv- er up to 120mW per channel into 16 Ω and 135mW into 32 Ω. The MAX13330 features a fixed gain of -1.5V/V, and the MAX13331 features a programmable gain con- figured with external resistors. The headphone outputs feature ±15kV Human Body Model ESD protection, and enhanced short-circuit protection to ground or battery (VBAT up to +45V). An integrated short-circuit diagnos- tic output provides the status of the MAX13330/ MAX13331 during operation as a fraction of the analog supply voltage. DirectDrive Conventional single-supply headphone amplifiers have their outputs biased about a nominal DC voltage (typi- cally half the supply) for maximum dynamic range. Large coupling capacitors are needed to block this DC bias from the headphone. Without these capacitors, a significant amount of DC current flows to the head- phone, resulting in unnecessary power dissipation and possible damage to both the headphone and the head- phone amplifier. Maxim’s DirectDrive architecture uses a charge pump to create an internal negative-supply voltage, allowing the MAX13330/MAX13331 outputs to be biased about SGND (Figure 1). With no DC component, there is no need for the large DC-blocking capacitors. Instead of two large (220µF, typ) tantalum capacitors, the MAX13330/MAX13331 charge pump requires two small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the headphone amplifier. See the Output Power vs. Load Resistance graph in the Typical Operating Characteristics for details of the possible capacitor sizes. There is a low DC voltage on the amplifier out- puts due to amplifier offset. However, the output offset of the MAX13330 is typically ±2.5mV which, when com- bined with a 32 Ω load, results in less than ±78µA of DC current flow to the headphones. Previous attempts to eliminate the output-coupling capacitors involved bias- ing the headphone return (sleeve) to the DC-bias volt- age of the headphone amplifiers. This method raises some issues: • The sleeve is typically grounded to the chassis. Using this biasing approach, the sleeve must be isolated from system ground, complicating product design. • During an ESD strike, the amplifier’s ESD structures are the only path to system ground. Thus, the ampli- fier must be able to withstand the full ESD strike. • When using the headphone jack as a line out to other equipment, the bias voltage on the sleeve may conflict with the ground potential from other equipment, resulting in possible damage to the amplifiers. VDD VSS GND VOUT CONVENTIONAL DRIVER-BIASING SCHEME DirectDrive BIASING SCHEME VDD/2 VDD GND VOUT Figure 1. Conventional Driver Output Waveform vs. MAX13330/ MAX13331 Output Waveform |
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