MSP3421G MICRONAS [Micronas], MSP3421G Datasheet - Page 90

• Manufacturer Part Number: MSP3421G
• Description: Multistandard Sound Processor Family with Virtual Dolby Surround
• Manufacturer: MICRONAS [Micronas]

MSP 34x1G
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 6–9: AD_CV Register; reset status: all bits are “0”
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)
90
Bit
[0]
[1:6]
[7]
[8]
[9]
[10:15]
X : not affected while choosing the TV sound standard by means of the STANDARD SELECT Register
Application
Terrestrial TV
SAT
ADR
1)
FM Standards
NICAM/FM
NICAM/AM
NICAM only
For signals above 1.4 V
robustness of the internal processing, the IC works up to and even more than 3 V
FM1/FM2 ratio are supposed. In this overflow case, a loss of FM-S/N ratio of about 10 dB may appear.
Function
not used
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).
Determination of Automatic Gain or
Constant Gain
Selection of Sound IF source
(identical to MODUS[8])
MSP-Carrier-Mute Feature
not used
Input Signal Contains
1 or 2 FM Carriers
1 FM and 1 NICAM Carrier
1 AM and 1 NICAM Carrier
1 NICAM Carrier only
1 or more FM Carriers
FM and ADR carriers
pp
, the minimum gain of 3 dB is switched, and overflow of the A/D converter may result. Due to the
(00 BB
AD_CV
hex
)
AD_CV [6:1]
Ref. Value
101000
101000
100011
010100
100011
see DRP 3510A data sheet
Settings
must be set to 0
0 = constant gain
1 = automatic gain
0 = ANA_IN1
1 = ANA_IN2
0 = off: no mute
1 = on: mute as de-
scribed in section 2.2.2.
must be set to 0
AD_CV [6:1]
in integer
40
40
35
20
35
pp
, if norm conditions of FM/NICAM or
Range of Input Signal
at pin ANA_IN1
and ANA_IN2
0.10
0.10
0.10
(recommended: 0.10
0.05
0.10
Automatic setting by
STANDARD SELECT Register
2-8, 0A-60
0
101000
1
X
1
0
PRELIMINARY DATA SHEET
3 V
3 V
1.4 V
1.0 V
3 V
pp
pp
pp
hex
1)
1)
pp
pp
1)
9
0
100011
1
X
0
0
0.8 V
Micronas
pp
)