AZV5001

Document number: DS37993 Rev. 2 - 2

9 of 12

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August 2015

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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

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.