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LM49370RLX-NOPB Fiches technique(PDF) 32 Page - Texas Instruments

No de pièce LM49370RLX-NOPB
Description  Boomer짰 Audio Power Amplifier Series Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker Amplifier, a Dual-Mode Stereo Headphone Amplifier, and a Dedicated PCM Interface for Bluetooth Transceivers
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM49370RLX-NOPB Fiches technique(HTML) 32 Page - Texas Instruments

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LM49370
SNAS356D – FEBRUARY 2007 – REVISED MARCH 2012
www.ti.com
DAC CONFIGURATION REGISTER
This register is used to control the DAC levels to the mixer.
Table 24. DAC (0x11h)
Bits
Field
Description
4:0
DAC_LEVEL
This programs the gain/attenuation applied to the DAC input to the mixer. (1)
DAC_LEVEL
Level (With Boost)
Level (Without Boost)
000002
−34.5 dB
−46.5 dB
000012
−33 dB
−45 dB
000102
−31.5 dB
−43.5 dB
000112
−30 dB
−42 dB
00100 to 111002
−28.5 dB to +7.5 dB
−40.5 dB to −4.5 dB
111012
+9 dB
−3 dB
111102
+10.5 dB
−1.5 dB
111112
+12 dB
0 dB
5
DAC_BOOST
If set, the gain of the DAC inputs to the mixer is increased by 12dB (see above).
6
DAC_MUTE
If set, the stereo DAC input is muted on the next zero crossing.
7
USE_AUX_
If set, the gain of the DAC inputs is controlled by the AUX_LEFT and AUX_RIGHT registers, allowing a stereo
LEVELS
balance to be applied.
(1)
The output from the DAC is 1V RMS for a full scale digital input. This can be boosted by 12 dB if enough headroom is available.
Clipping may occur if the analog power supply is insufficient to cater for the required gain.
CP_OUTPUT CONFIGURATION REGISTER
This register is used to control the differential cell phone output.(2)
Table 25. CP_OUTPUT (0x12h)
Bit
Field
Description
s
0
MIC_SELECT
If set, the microphone channel of the mixer is added to the CP_OUT output signal.
1
RIGHT_SELECT
If set, the right channel of the mixer is added to the CP_OUT output signal.
2
LEFT_SELECT
If set, the left channel of the mixer is added to the CP_OUT output signal.
3
CPO_MUTE
If set, the CPOUT output is muted.
4
MIC_NOISE_GAT
If this is set and NOISE_GATE_ON (register 0x08h) is enabled, the MIC to CPO path will be gated if the signal is
E
determined to be noise by the AGC (that is, if the signal is below the set noise threshold).
(2)
The gain of cell phone output amplifier is 0 dB.
AUX_OUTPUT CONFIGURATION REGISTER
This register is used to control the differential auxiliary output. (1)
Table 26. AUX_OUTPUT (0x13h)
Bits
Field
Description
0
CPI_SELECT
If set, the cell phone input channel of the mixer is added to the AUX_OUT output signal.
1
RIGHT_SELECT
If set, the right channel of the mixer is added to the AUX_OUT output signal.
2
LEFT_SELECT
If set, the left channel of the mixer is added to the AUX_OUT output signal.
3
AUX_MUTE
If set, the AUX_OUT output is muted.
(1)
The gain of the auxiliary output amplifier is 0 dB. If a second (external) loudspeaker amplifier is to be used its gain should be set to 12
dB to match the onboard loudspeaker amplifier gain.
32
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