FX829 Datasheet, PDF (16/34 Pages) CML Microcircuits – Baseband Signal Processor

Baseband Signal Processor
FX829
MOD LEVELS Register (Hex address $12)
The six least significant bits of the first byte in this register are used to set the attenuation of the Modulator 1
amplifier and the five least significant bits of the second byte in this register are used to set the attenuation of
the Modulator 2 amplifier, according to the tables below:
543210
0XXXXX
100000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
Mod. 1 Attenuation
Disabled (V_BIAS)
>40dB
12.0dB
11.6dB
11.2dB
10.8dB
10.4dB
10.0dB
9.6dB
9.2dB
8.8dB
8.4dB
8.0dB
7.6dB
7.2dB
6.8dB
6.4dB
6.0dB
5.6dB
5.2dB
4.8dB
4.4dB
4.0dB
3.6dB
3.2dB
2.8dB
2.4dB
2.0dB
1.6dB
1.2dB
0.8dB
0.4dB
0dB
43210
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Mod. 2 Attenuation
>40dB
6.0dB
5.8dB
5.6dB
5.4dB
5.2dB
5.0dB
4.8dB
4.6dB
4.4dB
4.2dB
4.0dB
3.8dB
3.6dB
3.4dB
3.2dB
3.0dB
2.8dB
2.6dB
2.4dB
2.2dB
2.0dB
1.8dB
1.6dB
1.4dB
1.2dB
1.0dB
0.8dB
0.6dB
0.4dB
0.2dB
0dB
X = don't care
MOD1 ENABLE When this bit is "1" the MOD1 attenuator is enabled.
(Bit 5, first byte) When this bit is "0" the MOD1 attenuator is disabled (i.e. powersaved).
Bits 6 and 7 in the first byte and bits 5, 6 and 7 in the second byte should always
be set to "0". MOD LEVELS (1) register is loaded first.
Note: The MOD2 attenuator is enabled by the AMP2 ENABLE signal (bit 6 of
CONTROL1 register).
RX SYNC WORD Register (Hex $44)
This is a two byte register that defines the 16-bit programmable synchronisation word. This word is compared
with the incoming Rx data and, if a match is found, it is indicated in the STATUS register and an interrupt is
generated. Bit 15, the MSB of the first byte, is loaded first.
© 1997 Consumer Microcircuits Limited
16
D/829/4