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LM4930 数据表(PDF) 5 Page - Texas Instruments

部件名 LM4930
功能描述  LM4930 Boomer??Audio Power Amplifier Series Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM4930 数据表(HTML) 5 Page - Texas Instruments

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LM4930
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SNAS212C – JULY 2003 – REVISED MAY 2013
Table 2. VOICE/TEST CONFIG Registers(1)
VOICETESTCONFIG (XX10001).
(Set = logic 1, Clear = logic 0)
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Register
Description
0
CLASS
If set, configures the chip for use with an external class D or linear amplifier and turns the BTL
speaker output into a buffer.(2)
4:1
SIDESTONE_ATTEN
Programs the attenuation of the digital sidetone. Attenuation is set as follows:
4:1
Sidetone
4:1
Sidetone Attenuation
Attenuation
0000
Mute
1000
-9dB
0001
-30dB
1001
-6dB
0010
-27dB
1010
-3dB
0011
-24dB
1011
0dB
0100
-21dB
1100
Mute
0101
-18dB
1101
Mute
0110
-15dB
1110
Mute
0111
-12dB
1111
Mute
5
AUTOSIDE
This feature is included for use with the mono speaker in hands-free applications where sidetones
may not be desirable. If set, the sidetone is always muted in modes when voice is played on the
mono speaker (0010, 0100, 1001, and 1010), otherwise the sidetone is present at whatever level is
set in the attenuation conrol register
6
CLOCK_DIV
If set, allows for the use of a 24.576MHz crystal. Default setting is for 12.288MHz crystal.(2)
7
ZXD_DISABLE
Disables the zero crossing detect in the stereo DAC to ensure immediate mode changes rather than
waiting for a zero cross.(3)
8:9
RSVD
RESERVED(4)
10:11
CAP_SIZE
Set to accomodate different bypass capacitor values to give correct turn-off delay and click/pop
performance. Value is set as follows:(2)
10:11
Delay
Bypass Capacitor Size
00
25ms
0.1µF
01
50ms
0.39µF
10
85ms
1µF
11
RESERVED
RESERVED
12
ZXDS_SLOW
If set, this forces the stereo DAC outputs to wait for a zero crossing before powering down
13
MUTE_LS
If set, mutes the loudspeaker amplifier in any mode where it is not already muted
14
MUTE_HP
If set, mutes the headphone amplifier in any mode where it is not already muted
15
MUTE_MIC
If set, mutes the microphone preamp
(1)
This register configures the voiceband codec, sidetone attenuation, and selected control functions. The 7 bit address for the VOICE
TESTCONFIG register is XX10001.
(X = 0 if ADDR is set to logic 0)
(X = 1 if ADDR is set to logic 1)
(2)
It is recommended to alter this bit only while the part is in Powerdown Mode.
(3)
To ensure a successful transistion into Powerdown Mode, ZXD_DISABLE must be set whenever there is no audio input signal present.
(4)
Reserved bits should be set to zero when programming the associated register.
Copyright © 2003–2013, Texas Instruments Incorporated
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