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AZV5001 Datasheet(PDF) 9 Page - Diodes Incorporated |
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AZV5001 Datasheet(HTML) 9 Page - Diodes Incorporated |
9 / 12 page AZV5001 Document number: DS37993 Rev. 2 - 2 9 of 12 www.diodes.com August 2015 © Diodes Incorporated AZV5001 Application Information Supply Voltage The AZV5001 device is guaranteed to operate at supply voltage ultra low to 1.6V. For better performance, a power supply decoupling capacitor is necessary, a minimum 0.1µF decoupling capacitor should be placed as close as possible to the VCC pin. Audio Jack Detection The AZV5001 is designed to simplify the detection of stereo audio connector with a microphone contact. When the headset is not connected, the internal pull-up resistors on L_Detect and G_Detect pull those pins high. When the headset is connected to the switched audio jack, the headset ground and left audio channel trigger L_Detect and G_Detect to logic low. The AZV5001 can work with either the CITA or OMTP standard. In order to support both standards simultaneously, a cross point switch and additional circuitry is necessary to detect and swap the ground and microphone pins. MIC Pin Biasing The AZV5001 typical application circuit in Figure 2 shows the recommended 2.2K Ω pull-up resistor to the MIC bias voltage under supply voltage 1.8V condition. While the headset is not detected, the internal NMOS transistor is enabled to mute the MIC signal. If the MIC sink current is 1mA under system application, the MIC pin is pulled near 1mV when the headset is not present. The internal NMOS transistor is optimized to sink up to 2mA of current, allowing some flexibility in the selection of the pull-up resistor and MIC bias voltage. |
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