Baseband Processor For Mixed Mode Land Mobile Radio
CMX880
PROGRAMMING REGISTER Block 1
$C8 (B1.1)
FINE INPUT GAIN
Bit:
15
1
14
0
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Fine Input Gain (unsigned integer)
Gain = 20 ´ log(IG/16384)
[IG is the unsigned integer value in the ‘Fine Input Gain’ field]
Fine input gain adjustment should be kept within the range 0dB to -3.5dB.
Bits 15 must be set to ‘1’ and bit 14 cleared to ‘0’.
$C8 (B1.2)
INPUT OFFSET
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
2’s complement offset,
resolution = V (A)/16384 per LSB
0
0
DD
Used to compensate for inherent offsets in the FM discriminator signal input. It is recommended that the offset
is kept within the range +/-50mV.
Bits 15 and 14 must both be cleared to 0.
$C8 (B1.3)
FINE OUTPUT GAIN 1
Bit:
15
0
14
0
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Fine Output Gain 1 (unsigned integer)
$C8 (B1.4)
FINE OUTPUT GAIN 2
Bit:
15
0
14
0
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Fine Output Gain 2 (unsigned integer)
Gain = 20 ´ log(OG/16384)
[OG is the unsigned integer value in the ‘Fine Output Gain’ field]
Fine output gain adjustment should be kept within the range 0dB to -3.5dB.
Bits 15 and 14 must both be cleared to 0.
$C8 (B1.5)
OUTPUT 1 OFFSET
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
3
3
2
2
1
1
0
0
2’s complement offset,
0
0
resolution = V
(A)/16384 per LSB
DD
$C8 (B1.6)
OUTPUT 2 OFFSET
Bit:
15
14
13
12
11
10
9
8
7
6
5
4
2’s complement offset,
resolution = V (A)/16384 per LSB
0
0
DD
Used to compensate for inherent offsets in the output path via DAC 1 (Output 1 Offset) and DAC 2 (Output 2
Offset). It is recommended that the offset is kept within the range +/-50mV.
Bits 15 and 14 must both be cleared to 0.
ã 2001 Consumer Microcircuits Limited
59
D/880/1
CMLMICRO [ CML MICROCIRCUITS ]
