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MAX97000 Datasheet(PDF) 18 Page - Maxim Integrated Products |
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MAX97000 Datasheet(HTML) 18 Page - Maxim Integrated Products |
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18 / 33 page  Audio Subsystem with Mono Class D Speaker and Class H Headphone Amplifier 18 Pin Description (continued) Detailed Description The MAX97000 audio subsystem combines a mono speaker amplifier with a stereo headphone amplifier and an analog DPST switch. The high-efficiency 725mW Class D speaker amplifier operates directly from the bat- tery and consumes no more than 1FA when in shutdown mode. The headphone amplifier utilizes a dual-mode charge pump and a Class H output stage to maximize efficiency while outputting a ground-referenced signal that does not require output coupling capacitors. The headphone and speaker amplifiers have independent volume control and on/off control. The four inputs are configurable as two differential inputs or four single- ended inputs. All control is performed using the 2-wire, I2C interface. The speaker amplifier incorporates a distortion limiter to automatically reduce the volume level when excessive clipping occurs. This allows high gain for low-level sig- nals without compromising the quality of large signals. Internal Linear Regulator The MAX97000 includes an internal regulator (LDOIN) to generate VDD. The regulator allows single-supply opera- tion directly from a Li+ battery. Signal Path The MAX97000 signal path consists of flexible inputs, signal mixing, volume control, and output amplifiers (Figure 2). The inputs can be configured for single- ended or differential signals (Figure 3). The internal preamplifiers feature programmable gain settings using internal resistors and an external gain setting using a trimmed internal feedback resistor. The external option allows any desired gain to be selected. Following pream- plification, the input signals are mixed, volume adjusted, and routed to the headphone and speaker amplifiers based on the desired configuration. Figure 2. Signal Path -64dB TO +6dB MIXER AND MUX INA2 INA1 INB2 INB1 0/3dB -64dB TO +6dB 0/3dB -30dB TO +20dB +12dB INPUT A -6dB TO +18dB INPUT B -6dB TO +18dB BUMP NAME FUNCTION D1 OUTN Negative Speaker Output D2 COM1 Analog Switch 1 Input D3 COM2 Analog Switch 2 Input D4 INB1 Input B1. Left or negative input. D5 INB2 Input B2. Right or positive input. E1 OUTP Positive Speaker Output E2 NC1 Analog Switch 1 Output E3 NC2 Analog Switch 2 Output E4 INA1 Input A1. Left or negative input. E5 INA2 Input A2. Right or positive input. |
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