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LM4831 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM4831 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 12 page  Pin Descriptions (Continued) PWRDWN This pin is used to power down the entire IC (except BEEP Circuitry). Placing a logic high on the PWRDWN pin will place the LM4831 in a low supply current state. To minimize the shutdown-mode supply current, the PWRDWN pin should be pulled up to the voltage on the LM4831 power supply pins. The PWRDWN pin is overridden if an edge change occurs on any of the BEEP A–D inputs. L_INA, L_INB, L_INC These pins are the left channel inputs. Typical input impedance on each input is 20 k Ω. R_INA, R_INB, R_INC These pins are the right channel inputs. Typical input impedance on each input is 20 k Ω. L_MIX, R_MIX These pins are the inverting input nodes of the input mixer for the left and right channel, respectively. L_EQOUT, R_EQOUT These are the outputs of the input mixer for the left and right channel, respectively. This output is generally fed to an external filter to equalize the response of internal computer speakers and then back into the EQIN pins. L_EQIN, R_EQIN These pins are one of the two inputs to the 2:1 analog multiplexer and are used to feed in externally filtered versions of the EQOUT signals. The 2:1 multiplexer selects the signal on L_EQIN and R_EQIN if the HP_IN and DS_IN pins are both low. L_MUX, R_MUX These are the stereo outputs of the 2:1 analog multiplexer. The output of the 2:1 multiplexer is decided by the state of the HP-IN and DS-IN pins. If both HP-IN and DS-IN are low, the 2:1 mux selects the analog input on the EQIN pins. If either HP-IN or DS-IN is high, the 2:1 mux selects the internal analog path. See . L_LINEOUT, R_LINEOUT These are the line outputs for the left and right channel, respectively. Although these outputs are capable of driving a wide range of resistive loads, they are typically used to drive an impedance of at least 10 k Ω. These outputs are only enabled when the DS-IN pin is high, otherwise, they are in a high-impedance state. L_PA+IN, R_PA+IN These pins are the positive inputs of the output audio power amplifiers. Since the power amplifier is typically configured as an inverting amplifier, these pins should be connected to the BYPASS pin to properly bias the output power amplifiers. Further, these pins should be individually bypassed with a capacitor of 0.01 µF–0.1 µF. L_PA−IN, R_PA−IN These pins are the inverting inputs for the output audio power amplifier for the left and right channel, respectively. L_PA−OUT, R_PA−OUT These pins are the inverted power amp outputs for the left and right channel, respectively. In bridged mode (DS-IN = HP_IN = PWRDWN = low), each output drives one terminal of a direct coupled bridged speaker. In single-ended (headphone) mode, (HP_IN = high, PWRDWN = low, DS-IN = N/A) these outputs drive a capacitively coupled stereo headphone. In docking station mode (DS-IN = high, HP_IN = PWRDWN = low), these outputs are disabled. L_PA+OUT, R_PA+OUT These pins are the non-inverted power amp outputs for the left and right channel, respectively. In bridged mode (DS-IN = HP_IN = PWRDWN = low), each output drives one terminal of a direct coupled bridged speaker. In single-ended (headphone) mode (HP_IN = high, PWRDWN = low, DS-IN = N/A), these outputs are in a high impedance state, effectively muting the bridged loudspeaker. In docking station mode (DS-IN = high, HP_IN = PWRDWN = low), these outputs are disabled. www.national.com 6 |
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