MSP3411G Datasheet, PDF (88/102 Pages) Micronas – Multistandard Sound Processor Family with Virtual Dolby Surround

MSP 34x1G
PRELIMINARY 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 34x1G.
Table 6–8: AD_CV Register; reset status: all bits are “0”
Bit
Function
[0]
not used
AD_CV
(00 BB_hex)
Settings
must be set to 0
Automatic setting by
STANDARD SELECT Register
2-8, 0A-60_hex 9
0
0
[1−6]
Reference level in case of Automatic Gain
Control = on (see Table 6–9). Constant gain
factor when Automatic Gain Control = off
(see Table 6–10).
101000
100011
[7]
Determination of Automatic Gain or
0 = constant gain
1
1
Constant Gain
1 = automatic gain
[8]
Selection of Sound IF source
(identical to MODUS[8])
0 = ANA_IN1+
X
X
1 = ANA_IN2+
[9]
MSP-Carrier-Mute Feature
0 = off: no mute
1
0
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
Table 6–9: 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 1 or 2 FM Carriers
101000
40
− NICAM/FM
1 FM and 1 NICAM Carrier
101000
40
− NICAM/AM
1 AM and 1 NICAM Carrier 100011
35
− NICAM only
1 NICAM Carrier only
010100
20
SAT
1 or more FM Carriers
100011
35
0.10 − 3 V_pp1)
0.10 − 3 V_pp1)
0.10 − 1.4 V_pp
(recommended: 0.10 − 0.8 V_pp)
0.05 − 1.0 V_pp
0.10 − 3 V_pp1)
ADR
FM and ADR carriers
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 V_pp, 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.
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