Datasheet

TLV320DAC3101

www.ti.com

SLAS666A –JANUARY 2010–REVISED MAY 2012

5.4 Analog Signals

The TLV320DAC3101 analog signals consist of:

• Microphone bias (MICBIAS)

• Analog inputs AIN1 and AIN2

• Analog outputs class-D speaker driver and headphone/lineout driver providing output capability for the

DAC, AIN1, AIN2 or a mix of the three

5.4.1 MICBIAS

The TLV320DAC3101 includes a microphone bias circuit which can source up to 4 mA of current and is

programmable to a 2-V, 2.5-V, or AVDD level. The level can be controlled by writing to page 1 /

Table 5-10. MICBIAS Settings

D1 D0 FUNCTIONALITY

0 0 MICBIAS output is powered down.

0 1 MICBIAS output is powered to 2 V.

1 0 MICBIAS output is powered to 2.5 V.

1 1 MICBIAS output is powered to AVDD.

During normal operation, MICBIAS can be set to 2.5 V for better performance. However, depending on the

model of microphone that is selected, optimal performance might be obtained at another setting, so the

performance at a given setting should be verified.

The lowest current consumption occurs when MICBIAS is powered down. The next-lowest current

consumption occurs when MICBIAS is set at AVDD.

5.4.2 Analog Inputs AIN1 and AIN2

AIN1 (pin 13) and AIN2 (pin 14) are inputs to the output mixer along with the DAC output. Page 1 /

of the output mixer then can be attenuated or gained through the class-D and/or headphone/lineout

drivers.

5.5 Audio DAC and Audio Analog Outputs

Each channel of the stereo audio DAC consists of a digital audio processing block, a digital interpolation

filter, a digital delta-sigma modulator, and an analog reconstruction filter. This high oversampling ratio

(normally DOSR is between 32 and 128) exhibits good dynamic range by ensuring that the generated

quantization noise stays outside of the audio frequency band. Audio analog outputs include stereo

headphone/lineouts and stereo class-D speaker outputs.

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