GMSK Packet Data Modem and RF Transceiver
CMX990
RamDac control
$10
Write
7
6
5
4
3
3
2
1
0
Bit:
Inc Aux
RAM
address
En Aux
RAM
access
RAM DAC scan rate
[0-7 = /1024 to /8]
Scan
direction
En auto
cycle
En RAM
DAC
Aux Control1 $11
Write
7
6
5
4
2
1
0
Bit:
Enable
ADC 5
Enable
ADC 4
Enable
ADC 3
Enable
ADC 2
Enable
ADC 1
Enable
ADC 0
0
0
Aux Control2 $12
Write
7
6
5
0
4
0
3
0
2
1
0
Bit:
DAC RAM
Polarity
Reset DAC
RAMs
Conversion Enable cont
rate conversion
Start
conversion
AuxRamData1
$14-15 Write
Bit:
7
6
6
5
5
4
3
2
2
1
1
0
0
7
6
0
5
0
4
0
3
0
2
0
1
1
0
0
MSB
0
LSB
AuxRamData2
Bit:
$16-17 Write
7
4
3
7
0
6
0
5
0
4
0
3
0
2
0
MSB
LSB
0
Analogue Setup 1
$18
Write
7
6
5
4
3
2
1
Bit:
Set Tx attenuation:
'11' = 10dB, '10' = 15
'01' = 25, '00' = 35
Coarse Rx I offset, '10000' = Mid value
'00000' = Max -ve offset, '11111' = Max +ve offset
Analogue Setup 2
$19
Write
7
6
5
4
3
2
1
0
0
Bit:
Set Rx AGC:
'11' = +40, '10' = +25
'01' = +10, '00' = -5dB
Coarse Rx Q offset, '10000' = Mid value
'00000' = Max -ve offset, '11111' = Max +ve offset
Special Command
$1A
Write
7
6
5
4
3
2
1
Bit:
Special Command
ã 2004 CML Microsystems Plc
49
D/990/1
CMLMICRO [ CML MICROCIRCUITS ]
