ISDB-T Single-Segment Low-IF Tuners
Table 5. Control Register
BIT NAME
BIT LOCATION
(0 = LSB)
RECOMMENDED
DEFAULT
FUNCTION
Sets the modulation mode and the baseband gain step.
MOD
7
0
0 = selects QAM mode and disables the 7dB gain step
1 = selects QPSK mode and adds 7dB of gain in the baseband stages
Set the bias current for the baseband circuits to provide for fine linearity
adjustments.
BBL[1:0]
6, 5
10
00 = lower linearity
01 = nominal linearity
10 = medium linearity
11 = high linearity
Selects between high-side and low-side LO injection.
HSLS
4
1
0 = low-side injection
1 = high-side injection
Set the AGC attack point (at RFIN).
000 = -62dBm
001 = -60dBm
010 = -58dBm
PD[2:0]
3, 2, 1
011
011 = -56dBm
100 = -54dBm
101 = -52dBm
110 = -50dBm
111 = -48dBm
Enables or disables the power-detector circuit.
EPD
0
0
0 = disables the power-detector circuit for low-current mode
1 = enables the power-detector circuit
14
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