LM49352RLX/NOPB National Semiconductor, LM49352RLX/NOPB Datasheet - Page 87

• Manufacturer Part Number: LM49352RLX/NOPB
• Description: IC AMP AUDIO MONO D1.4W 36USMD
• Manufacturer: National Semiconductor
• Series: Boomer®, PowerWise®r
• Type: Class Dr

Specifications of LM49352RLX/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.4W x 1 @ 8 Ohm; 65mW x 2 @ 32 Ohm
• Features: Depop, Differential Inputs, I²C, I²S, Microphone, Shutdown, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 36-MicroSMDxt
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Other names: LM49352RLX

25.0 DAC Effects Registers
Bits
Bits
2:0
3:0
3
4
4
NOISE_FLOOR
DAC_SAMPLE
STEREO LINK
NG_ENB
LIMITER
Field
Field
This programs the timers on the ALC with the closest DAC sample rate.
If set, the circuit will never apply gain to the signal, no matter how small, but
it will attenuate the signal as soon as it reaches target and release it at the
decay rate, once signal level reduces below target. The I
the time the LIMITER is enabled) is the maximum gain that the ALC will apply.
Care should be taken when choosing the optimum I
enabling the Limiter.
If set, the ALC circuit uses the stereo average of the input signals to control
the gain of the stereo output. This maintains stereo imaging. If this bit is
cleared, then both channels operate as dual mono.
This sets the anticipated noise floor. Signals lower than the specified noise
floor will be gated from the ALC to avoid noise pumping.
This enables the Noise Gate
TABLE 64. DAC_ALC_1 (0xA0h)
TABLE 65. DAC_ALC_2 (0xA1h)
NOISE_FLOOR
DAC_SAMPLE
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
000
001
010
011
100
101
110
111
87
Description
Description
Expected DAC f
Noise Floor (dB)
192kHz
12kHz
16kHz
24kHz
32kHz
48kHz
96kHz
8kHz
-39
-42
-45
-48
-51
-54
-57
-60
-63
-66
-69
-72
-75
-78
-81
-84
2
C gain setting whenever
S
2
C gain setting (at
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