CMX981 Consumer Microcircuits Limited, CMX981 Datasheet - Page 31
CMX981
Manufacturer Part Number
CMX981
Description
Advanceddigital Radio Baseband Processor (tetra Etc.)
Manufacturer
Consumer Microcircuits Limited
Datasheet
1.CMX981.pdf
(66 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
CMX981Q1
Manufacturer:
CML
Quantity:
20 000
Advanced Digital Radio Baseband Processor
5.11.16 $12
5.11.17 $13
2002 CML Microsystems Plc
Setting any of bits 4 to 0 high will power down the appropriate section of the device.
Setting bit 5 high will speed up the digital outputs, reducing rise and fall times, but increasing
power consumption and ground bounce.
Setting bit 7 high will bypass the Rx ADC passive filter.
Setting bit 6 high will bypass the Tx DAC passive filter.
Bit 5 will bypass the voice codec IIR filter allowing direct access to the ADC/DAC. This option will
also increase the codec sample clock to 32kHz and configure the CodecData register as a 16-bit
interface.
Setting bit 4 high will connect the output of the codec DAC to the input of the codec ADC.
Setting bit 3 high will connect the output of the Tx DAC to the input of the Rx ADC, thus passing
transmit constellation data through a raised cosine filter and allowing the resultant data samples to
be monitored digitally at the Rx output.
Bit 2 will enable access to the receive path data access point.
Bit 1 will enable access to the transmit path data access point.
Setting bit 0 high will connect the output of the Tx path data operator to the Rx port. Data is taken
from the I and Q channels on alternate sample clocks.
Bit
Bit
Not used.
Rx ADC
Set this
Bypass
passive
bit low.
filter
7
7
PowerDownCtrl
LoopBackCtrl
Not used.
Tx DAC
Set this
passive
Bypass
bit low.
filter
6
6
Set pins
Bypass
fast
IIR
5
5
Power Down Control Register
Loop Back Control Register
31
bias chain
loop back
analogue
analogue
Enable
Power
codec
down
4
4
down Aux
loop back
analogue
Enable
Power
DAC4
3
3
down Aux
data path
receive
Enable
access
Power
DAC3
2
2
down Aux
data path
transmit
Enable
access
Power
DAC2
1
1
down Aux
loop back
Enable
Power
DAC1
digital
0
0
CMX981
D/981/1