MSP 3410 B
PRELIMINARY DATA SHEET
11.2. Write Registers: Functions and Values
In the following, the functions of some registers are ex-
plained and their (default) values are defined:
11.2.1. Setting of Parameter AD_CV
Table 11–2: AD_CV Register
AD_CV 00BB
hex
Bit
Meaning
Settings
AD_CV [0]
test
0 = on (default)
1 = off (for testing)
AD_CV [6:1]
Reference level in case of Automatic Gain
Control = on (see Table 11–3). Constant gain
factor when Automatic Gain Control = off
(see Table 11–4).
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
MSP-Carrier-Mute Function
0 = off (no mute)
1 = on (mute as described in section
4.1.)
AD_CV[10]
NICAM-FIFO-Watchdog (only for test mode)
reserved
0 = on (default)
1 = off (for testing)
AD_CV[15:11]
0
Table 11–3: 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 41 or 43
1)
Terrestrial TV
2 FM Carriers or
1 FM and
101000
40
0.14 – 3 V
pp
1 NICAM Carrier
1)
SAT
1 or more
FM Carriers
100011
010100
35
20
0.14 – 3 V
pp
NICAM only
1 NICAM Carrier only
0.07 – 1.0 V
pp
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, 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.
18
ITT Semiconductors
MICRONAS [ MICRONAS ]
