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MAX9710EUE Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX9710EUE Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 15 page Detailed Description The MAX9710/MAX9711 are 3W BTL speaker ampli- fiers. The MAX9710 is a stereo speaker amplifier, while the MAX9711 is a mono speaker amplifier. Both devices feature a low-power shutdown mode, MUTE mode, and comprehensive click-and-pop suppression. These devices consist of high output-current op amps configured as BTL amplifiers (see Functional Diagram). The device gain is set by RF and RIN. BIAS These devices operate from a single 5V supply and feature an internally generated, power-supply-indepen- dent, common-mode bias voltage of 2.5V referenced to ground. BIAS provides both click-and-pop suppression and sets the DC bias level for the audio outputs. BIAS is internally connected to the noninverting input of each speaker amplifier (see Functional Diagram). Choose the value of the bypass capacitor as described in the BIAS Capacitor section. No external load should be applied to BIAS. Any load lowers the BIAS voltage, affecting the overall performance of the device. Shutdown The MAX9710/MAX9711 feature a 0.5µA low-power shut- down mode that reduces quiescent current consump- tion. Pulling SHDN low disables the device’s bias circuitry, the amplifier outputs are actively pulled low, and BIAS is driven to GND. Connect SHDN to VDD for normal operation. MUTE Both devices feature a clickless/popless MUTE mode. When the device is muted, the input disconnects from the amplifier. MUTE only affects the power amplifiers and does not shut down the device. Drive MUTE high to mute the device. Drive MUTE low for normal operation. Click-and-Pop Suppression The MAX9710/MAX9711 feature Maxim’s patented com- prehensive click-and-pop suppression. During startup, the common-mode bias voltage of the amplifiers slowly ramps to the DC bias point using an S-shaped wave- form. When entering shutdown, the amplifier outputs are actively driven low simultaneously. This scheme mini- mizes the energy present in the audio band. For optimum click-and-pop suppression, choose: RIN x CIN < RBIAS x CBIAS where RBIAS = 50k Ω. Applications Information BTL Amplifier The MAX9710/MAX9711 are designed to drive a load differentially, a configuration referred to as BTL. The BTL configuration (Figure 1) offers advantages over the single-ended configuration, where one side of the load is connected to ground. Driving the load differentially doubles the output voltage compared to a single- ended amplifier under similar conditions. Thus, the dif- ferential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is given by: Substituting 2 x VOUT(P-P) for VOUT(P-P) into the follow- ing equations yields four times the output power due to doubling of the output voltage: Since the differential outputs are biased at midsupply, there is no net DC voltage across the load. This elimi- nates the need for DC-blocking capacitors required for single-ended amplifiers. These capacitors can be large, expensive, consume board space, and degrade low-frequency performance. P V R OUT RMS L = 2 V V RMS OUT P P = − () 22 A R R VD F IN =× 2 3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown _______________________________________________________________________________________ 7 +1 VOUT(P-P) 2 x VOUT(P-P) VOUT(P-P) -1 Figure 1. Bridge-Tied Load Configuration |
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