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MAX9789A Datasheet(PDF) 16 Page - Maxim Integrated Products |
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MAX9789A Datasheet(HTML) 16 Page - Maxim Integrated Products |
16 / 26 page Windows Vista-Compliant, Stereo Class AB Speaker Amplifiers and DirectDrive Headphone Amplifiers 16 ______________________________________________________________________________________ Speaker and Headphone Amplifier Enable The MAX9789A/MAX9790A feature control inputs for the independent enabling of the speaker and headphone amplifiers, allowing both to be active simultaneously if required. Driving SPKR_EN high disables the speaker amplifiers. Driving HP_EN low independently disables the headphone amplifiers. For applications that require only one of the amplifiers to be on at a given time, SPKR_EN and HP_EN can be tied together allowing a single logic voltage to enable either the speaker or the headphone amplifier as shown in Figure 4. MUTE The MAX9789A/MAX9790A allow for the speaker and headphone amplifiers to be muted. By driving MUTE low, both the speaker and headphone amplifiers are muted. When muted, the speaker outputs remain biased at VDD / 2. Shutdown The MAX9789A/MAX9790A feature a low-power shut- down mode, drawing 0.3µA of supply current. By dis- abling the speaker, headphone amplifiers and the LDO (for MAX9789A), the MAX9789A/MAX9790A enter low- power shutdown mode. Set SPKR_EN to VDD and HP_EN and LDO_EN to GND to disable the speaker amplifiers, headphone amplifiers, and LDO, respectively. Click-and-Pop Suppression Speaker Amplifier The MAX9789A/MAX9790A speaker amplifiers feature Maxim’s comprehensive, industry-leading click-and- pop suppression. During startup, the click-and-pop suppression circuitry eliminates any audible transient sources internal to the device. When entering shut- down, the differential speaker outputs ramp to GND quickly and simultaneously. Headphone Amplifier In conventional single-supply headphone amplifiers, the output-coupling capacitor is a major contributor of audi- ble clicks and pops. Upon startup, the amplifier charges the coupling capacitor to its bias voltage, typically VDD / 2. Likewise, during shutdown, the capacitor is dis- charged to GND. A DC shift across the capacitor results, which in turn, appears as an audible transient at the headphone. Since the MAX9789A/MAX9790A do not require output-coupling capacitors, no audible transient occurs. Additionally, the MAX9789A/MAX9790A features exten- sive click-and-pop suppression that eliminates any audible transient sources internal to the device. The startup/shutdown waveform in the Typical Operating Characteristics shows that there are minimal spectral components in the audible range at the output. Applications Information BTL Speaker Amplifiers The MAX9789A/MAX9790A feature speaker amplifiers designed to drive a load differentially, a configuration referred to as bridge-tied load (BTL). The BTL configu- ration (Figure 5) 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 operating under similar conditions. The doubling of the output voltage yields four times the out- put power at the load. Since the differential outputs are biased at mid-supply, 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. MAX9789A/MAX9790A SPKR_EN SINGLE CONTROL PIN HP_EN Figure 4. Enabling Either the Speaker or Headphone Amplifier with a Single Control Pin +1 VOUT(P-P) 2 x VOUT(P-P) VOUT(P-P) -1 Figure 5. Bridge-Tied Load Configuration |
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Similar Description - MAX9789A |
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