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MAX9730 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX9730 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page 2.4W, Single-Supply, Class G Power Amplifier 8 _______________________________________________________________________________________ Utilizing a Class G output stage with an inverting charge pump allows the MAX9730 to realize a 2.4W output power with a 5V supply. The theoretical best efficiency of a linear amplifier is 78%; however, that efficiency is only exhibited at peak output powers. Under normal operating levels (typical music reproduction levels), efficiency falls below 30%, whereas the MAX9730 still exhibits 50% efficiency under the same conditions. Inverting Charge Pump The MAX9730 features an integrated charge pump with an inverted supply rail that can supply greater than 700mA over the positive 2.7V to 5.5V supply range. In the case of the MAX9730, the charge pump generates the negative supply rail (PVSS) needed to create the higher supply range, which allows the output of the device to operate over a greater dynamic range as the battery supply collapses over time. Shutdown Mode The MAX9730 has a shutdown mode that reduces power consumption and extends battery life. Driving SHDN low places the MAX9730 in a low-power (0.3µA) shutdown mode. Connect SHDN to VCC for normal operation. Click-and-Pop Suppression The MAX9730 Class G amplifier features Maxim’s com- prehensive, industry-leading click-and-pop suppres- sion. During startup, the click-and-pop suppression circuitry eliminates any audible transient sources inter- nal to the device. Applications Information Differential Input Amplifier The MAX9730 features a differential input configuration, making the device compatible with many CODECs, and offering improved noise immunity over a single-ended input amplifier. In devices such as PCs, noisy digital signals can be picked up by the amplifier’s input traces. The signals appear at the amplifiers’ inputs as common-mode noise. A differential input amplifier amplifies the difference of the two inputs, and signals common to both inputs are canceled out. When config- ured for differential inputs, the voltage gain of the MAX9730 is set by: where AV is the desired voltage gain in dB. RIN+ should be equal to RIN- and RFB+ should be equal to RFB-. The Class G output stage has a fixed gain of 4V/V (12dB). Any gain or attenuation set by the external input stage resistors will add to or subtract from this fixed gain. See Figure 3. A R R dB V FB IN =× ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ ⎡ ⎣ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ () 20 4 log _ _ MAX9730 EFFICIENCY vs. CLASS AB OUTPUT POWER (W) 1.5 1.0 0.5 10 20 30 40 50 60 70 80 90 100 0 0 2.0 MAX9730 TRADITIONAL CLASS AB MAX9730 + IN+ FB+ RIN+ RIN- CIN- CIN- IN- FB- - CLASS G OUTPUT STAGE RFB+ RFB- Figure 2. MAX9730 Efficiency vs. Class AB Efficiency vs. Class D Efficiency Figure 3. Gain Setting |
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