TQ-Systems STK-MBa53, User Manual

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User's Manual l STK-MBa53 UM 100 l © 2013 TQ-Group Page 39
4.2.9 Audio
To process audio input and output signals the audio-codec SGTL5000 is provided.
It is connected to the TQMa53 over the interfaces I2C and I2S. The I2C bus 2 is used.
Illustration 34: Block diagram audio
The SGTL5000
10 provides a stereo line-in, stereo line-out, a microphone input, as well as an (amplified) headphone output.
The headphone output is, however, not available on the STK-MBa53 by default. It can be enabled at X13 by placement option.
The necessary configurations are shown in Table 52.
The audio interfaces are provided at three 3.5 mm jacks (X13 – X15). The basic electric characteristics are shown in Table 53.
Table 52: Configuration for headphone or line-out
Signals at X13 R112 R114 R113 R115 R117 R118 Remark
Line-out 0 Ω 0 Ω n.a. n.a. 0 Ω n.a. Default
Headphone n.a. n.a. 0 Ω 0 Ω n.a. 0 Ω
Table 53: Electric characteristics of the audio interface
Parameter Min. Typ. Max. Unit Remark
Headphone (p
Headphone (p Headphone (p
Headphone (placement option
lacement option lacement option
lacement option)))) Stereo
Stereo Stereo
Stereo
Output power – – 58 mW At 16 Ω input impedance
Output power – – 30 mW At 32 Ω input impedance
Signal-noise ratio – – 98 dB At 16 Ω input impedance, with –60 dB input power
Signal-noise ratio – – 100 dB At 32 Ω input impedance, with –60 dB input power
Line
Line Line
Line----out
out out
out Stereo
Stereo Stereo
Stereo
Signal-noise ratio – – 100 dB With –60 dB input power
Output level – – 1 V
RMS
–
Line Line Line Line----in in in in Stereo Stereo Stereo Stereo
Input impedance 10 – – kΩ –
Microphone input Microphone input Microphone input Microphone input Mono Mono Mono Mono
Gain – N*10 – dB N = [0, 2, 3, 4]
1.25 – 3 V Can be set in steps of 0.25 V
General General General General
Sampling rate 8 – 96 kHz Only multiples of SYS_MCLK (256×, 384×, 512×) can be selected
10 See (6), data sheet SGTL5000.