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MSP3440G 参数 Datasheet PDF下载

MSP3440G图片预览
型号: MSP3440G
PDF下载: 下载PDF文件 查看货源
内容描述: 多标准音频处理器系列 [Multistandard Sound Processor Family]
分类和应用:
文件页数/大小: 106 页 / 1906 K
品牌: MICRONAS [ MICRONAS ]
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MSP 34x0G  
DATA SHEET  
6.3.4. Register AD_CV  
The use of this register is no longer recommended.  
Use it only in cases where compatibility to the  
MSP 34x0D is required. Using the STANDARD  
SELECTION register together with the MODUS regis-  
ter provides a more economic way to program the  
MSP 34x0G.  
Table 6–9: AD_CV Register; reset status: all bits are “0”  
AD_CV  
(00 BBhex  
Automatic setting by  
STANDARD SELECT Register  
)
Bit  
[0]  
Function  
Settings  
2-8, 0A-60hex  
9
not used  
must be set to 0  
0
0
[1:6]  
Reference level in case of Automatic Gain  
Control = on (see Table 6–10). Constant  
gain factor when Automatic Gain Control =  
off (see Table 6–11).  
101000  
100011  
[7]  
[8]  
[9]  
Determination of Automatic Gain or  
Constant Gain  
0 = constant gain  
1 = automatic gain  
1
X
1
1
X
0
Selection of Sound IF source  
(identical to MODUS[8])  
0 = ANA_IN1+  
1 = ANA_IN2+  
MSP-Carrier-Mute Feature  
0 = off: no mute  
1 = on: mute as de-  
scribed in section 2.2.2.  
[10:15]  
not used  
must be set to 0  
0
0
X : not affected while choosing the TV sound standard by means of the STANDARD SELECT Register  
Note: This register is initialized during STANDARD SELECTION and is automatically updated when Automatic  
Sound Select (MODUS[0]=1) is on.  
Table 6–10: Reference Values for Active AGC (AD_CV[7] = 1)  
Application  
Input Signal Contains  
AD_CV [6:1]  
Ref. Value  
AD_CV [6:1]  
in integer  
Range of Input Signal  
at pin ANA_IN1+  
and ANA_IN2+  
Terrestrial TV  
FM Standards  
NICAM/FM  
NICAM/AM  
1)  
1 or 2 FM Carriers  
101000  
101000  
100011  
40  
40  
35  
0.10 3 Vpp  
1)  
1 FM and 1 NICAM Carrier  
1 AM and 1 NICAM Carrier  
0.10 3 Vpp  
0.10 1.4 Vpp  
(recommended: 0.10 0.8 Vpp  
)
NICAM only  
1 NICAM Carrier only  
010100  
100011  
20  
35  
0.05 1.0 Vpp  
1)  
SAT  
1 or more FM Carriers  
FM and ADR carriers  
0.10 3 Vpp  
ADR  
see DRP 3510A data sheet  
1)  
For signals above 1.4 Vpp, the minimum gain of 3 dB is switched, and overflow of the A/D converter may result. Due to the  
robustness of the internal processing, the IC works up to and even more than 3 Vpp, if norm conditions of FM/NICAM or  
FM1/FM2 ratio are supposed. In this overflow case, a loss of FM-S/N ratio of about 10 dB may appear.  
92  
May 27, 2003; 6251-476-1DS  
Micronas  
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