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Interfaces and Connectors

Revised July 2011 Trim-Slice 11

3.4 Audio Subsystem

3.4.1 Analog Audio

The Trim-Slice analog audio subsystem is implemented with Texas Instruments TLV320AIC23b

audio codec. The analog audio subsystem supports the following features:

 Single ended stereo-line output

 Single ended stereo-line input

 Integrated electret-microphone biasing and buffering solution

 -kHz – 96-kHz Sampling-Frequency Support

 -dB SNR multi-bit Sigma-Delta DAC (A-weighted at 48 kHz)

 -dB SNR multi-bit Sigma-Delta ADC (A-weighted at 48 kHz)

The audio codec is connected to the Tegra2 I2S-0 port.

Analog line output is routed to the audio jack P4. Analog line input is routed to the audio jack P5.

Table 6 Audio Characteristics

Parameter

Test conditions

Min

Typ

Max

Unit

Headphone Output

-dB full-scale output voltage

1.0

Vrms

Maximum output power, PO

Rload = 32Ω

Rload = 16Ω

Signal-to-noise ratio, A-weighted (see

Note 2)

Total harmonic distortion

1kHz output

Pout = 10mW

0.1

Pout = 20mW

1.0

Power supply rejection ratio

1 kHz, 100 mVp-p

Programmable gain

1 kHz output

-73

Programmable-gain step size

Mute attenuation

1 kHz output

Line Input to ADC

Input signal level (0 dB)

1.0

Vrms

Signal-to-noise ratio, A-weighted, 0-dB

gain (see Notes 1 and 2)

Fsample = 48 kHz.

Dynamic range, A-weighted, −60-dB

full-scale input (see Note 2)

Total harmonicdistortion, −1-dB input,

0-dB gain

-80

Power supply rejection ratio

1 kHz, 100 mVp-p

ADC Channel Separation

1 kHz input tone

Programmable-gain step size

Monotonic

1.5

Mute attenuation

0dB, 1 kHz input tone

Input resistance

12 dB input gain

kΩ

0 dB input gain

Input capacitance

For additional details, please refer to the TLV320AIC23B datasheet, available from

http://focus.ti.com/.

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