PRELIMINARY DATA SHEET
MSP 34x1G
Table 6–10: AD_CV parameters for Constant Input Gain (AD_CV[7]=0)
Step
AD_CV [6:1]
Constant Gain
Gain
Input Level at pin ANA_IN1+ and ANA_IN2+
maximum input level: 3 Vpp (FM) or 1 Vpp (NICAM)1)
0
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
3.00 dB
1
2
3
4
5
6
7
8
3.85 dB
4.70 dB
5.55 dB
6.40 dB
7.25 dB
8.10 dB
8.95 dB
9.80 dB
10.65 dB
11.50 dB
12.35 dB
13.20 dB
14.05 dB
14.90 dB
15.75 dB
16.60 dB
17.45 dB
18.30 dB
19.15 dB
20.00 dB
9
10
11
12
13
14
15
16
17
18
19
20
maximum input level: 0.14 Vpp
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.
6.3.5. Register MODE_REG
Note: The use of this register is no longer recom-
mended. It should be used only in cases where soft-
ware compatibility to the MSP 34x0D is required.
Using the STANDARD SELECTION register together
with the MODUS register provides a more economic
way to program the MSP 34x1G.
As soon as this register is applied, the MSP 34x1G
works in the MSP 34x0D Compatibility Mode. In this
mode: BTSC, EIA-J, and FM-Radio are disabled.
Only MSP 34x0D features are available; the use of
MODUS and STATUS register is not allowed. The
MSP 34x1G is reset to the normal mode by first pro-
gramming the MODUS register, followed by transmit-
ting a valid standard code to the STANDARD SELEC-
TION register.
The register ‘MODE_REG’ contains the control bits
determining the operation mode of the MSP 34x1G in
the MSP 34x0D Compatibility Mode; Table 6–11
explains all bit positions.
MICRONAS INTERMETALL
89
MICRONAS [ MICRONAS ]
