MSP 3400C
PRELIMINARY DATA SHEET
6.2. Registers: Functions and Values
In the following, the functions of several registers are ex-
plained and their (default) values are defined.
6.2.1. Setting of Parameter AD_CV
Table 6–3: AD_CV Register
AD_CV Bit Range
AD_CV [0]
Meaning
Settings
not used
must be set to 0
see Table 6–5
AD_CV [6:1]
Reference level in case of Automatic Gain
Control = on.
Constant gain factor when Automatic Gain
Control = off .
see Table 6–6
AD_CV [7]
AD_CV [8]
AD_CV [9]
Determination of Automatic Gain or Constant
Gain
0 = constant gain
1 = automatic gain
Selection of analog input
0 = ANALOG IN1
1 = ANALOG IN2
MSPC-Carrier-Mute Function
0 = off: no mute
1 = on: mute (see section 4.1.8.)
AD_CV [11–10]
AD_CV [15–12]
Programmable Carrier-Mute Level
not used
see Table 6–4
must be set to 0
Table 6–4: Carrier Mute Level
Step
AD_CV [11:10]
binary
AD_CV [11:10] Internal reference level for mute active
decimal
(dBr: relative to MSP 3410 )
0
1
2
3
00
01
10
11
0
1
2
3
0 dBr
–3 dBr
–6 dBr
–12 dBr
Table 6–5: Reference values AD_CV [6:1] for active AGC (AD_CV[7] = 1)
Application
Input Signal Contains
Ref. Value
binary
Ref. Value
decimal
Range of Input Signal
at pin ANA_IN_1+ and
ANA_IN_2+
1)
Terrestrial TV
SAT
2 FM Carriers
101000
100011
40
35
20
0.14 – 3 V
0.14 – 3 V
0.14 – 3 V
pp
pp
pp
1)
1)
1 or more FM Carriers
ADR
1 or more FM Carriers and 010100
1 or more ADR Carriers
1)
For signals above 1.4 Vpp, the minimum gain of 3 dB is switched and overflow of the AD converter may result. Due
to the robustness of the internal processing in FM mode, the IC works properly up to and even more than 3 Vpp. In AM
mode, of course, no AD converter overflow is allowed. As a consequence, in the AM-mode, the maximum input at pins
41 or 43 must not exceed 1.4 Vpp.
MICRONAS INTERMETALL
21
MICRONAS [ MICRONAS ]
