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MAX9719 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9719 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 26 page Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers 10 ______________________________________________________________________________________ Pin Description (continued) PIN TDFN-EP/ µMAX UCSP TQFN-EP UCSP TSSOP-EP NAME FUNCTION — — 10 B4 12 OUTL- Left-Channel Bridge Amplifier Negative Output — — 12 D4 14 OUTR+ Right-Channel Bridge Amplifier Positive Output — — 15 D2 1 OUTR- Right-Channel Bridge Amplifier Negative Output — — 16 D1 2 INR- Right-Channel Inverting Input —— — — — EP Exposed Pad. Connect EP to GND. Detailed Description The MAX9718/MAX9719 are 1.4W BTL speaker ampli- fiers. The MAX9718 is a mono speaker amplifier, while the MAX9719 is a stereo speaker amplifier. Both devices feature a low-power shutdown mode, and industry-leading click-and-pop suppression. The MAX9718 features a two-input shutdown scheme to configure shutdown for active high or active low. These devices consist of high output-current audio amps con- figured as BTL amplifiers (see the Functional Diagrams). Both adjustable and fixed gain (0dB, 3dB, 6dB) versions are available. BIAS These devices operate from a single 2.7V to 5.5V sup- ply and feature an internally generated, common-mode bias voltage of VCC/ 2 referenced to ground. BIAS pro- vides both click-and-pop suppression and sets the DC bias level for the audio outputs. Choose the value of the bypass capacitor as described in the BIAS Capacitor section. Do not connect external loads to BIAS as this can affect the overall performance. Shutdown Mode The MAX9718/MAX9719 feature a 100nA low-power shutdown mode that reduces quiescent current con- sumption. Entering shutdown disables the device’s bias circuitry, the amplifier outputs go high impedance, and BIAS is driven to GND. The MAX9718 SHDM input con- trols the polarity of SHDN. Drive SHDM high for an active-high SHDN input. Drive SHDM low for an active- low SHDN input (see Table 1). The MAX9719 features an active-low shutdown input, SHDN. Click-and-Pop Suppression The MAX9718/MAX9719 feature Maxim’s industry-lead- ing click-and-pop suppression circuitry. During startup, the amplifier common-mode bias voltage ramps to the DC bias point. When entering shutdown, the amplifier outputs are high impedance to 100k Ω between both outputs. This scheme minimizes the energy present in the audio band. Applications Information BTL Amplifier The MAX9718/MAX9719 are designed to drive a load differentially, a configuration referred to as bridge-tied load or 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. Substituting 2 x VOUT(P-P) for VOUT(P-P) into the following 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 SHDM SHDN OPERATIONAL MODE 0 0 Shutdown 0 1 Normal operation 1 0 Normal operation 1 1 Shutdown Table 1. Shutdown Mode Selection (MAX9718 Only) |
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