CMX981 Consumer Microcircuits Limited, CMX981 Datasheet - Page 55

• Manufacturer Part Number: CMX981
• Description: Advanceddigital Radio Baseband Processor (tetra Etc.)
• Manufacturer: Consumer Microcircuits Limited

Advanced Digital Radio Baseband Processor
Receive Parameters
Input Impedance
Differential input voltage
Signal to noise
Signal to noise plus distortion
3
ADC sampling rate
ADC resolution
Integral accuracy
Differential accuracy
FIR filter sampling rate (Decimation section)
(RRC section)
Output rate (16 bit words per channel) - selectable
Offset (without adjustment)
Gain matching, I to Q (without adjustment, 0 - 10kHz)
Phase matching, I to Q (0 - 10kHz)
Storage time (with default coefficients)
With internal anti-alias filter disabled:
With internal anti-alias filter enabled:
TETRA Specific Parameters
RRC roll-off coefficient ( )
 2002 CML Microsystems Plc
rd
(Capacitive load to V
(Source impedance should be < 1k
SCLK >= MCLK/2
SCLK = MCLK/4
External anti-alias requirements
External anti-alias requirements
|H(f)| 0 - 5.85kHz
|H(f)| at 9kHz
|H(f)| at 10.05kHz
|H(f)| at 12.15kHz
|H(f)| at 16kHz
|H(f)| >25kHz
order intercept
at MCLK/70
at MCLK/4
at MCLK/70
SS1
Parameter
or V
SS2
)
55
Notes
6, 7
1
2
2
3
4
5
5
5
8
-30.0
-70.0
-85.0
Min.
90.0
85.0
-0.2
-2.9
-6.5
100
MCLK/128
MCLK/64
MCLK/64
MCLK/4
MCLK/4
Typ.
95.0
90.0
0.35
200
-3.0
-6.9
1.7
10.0
16
0
Max.
-15.0
-110
+0.2
-3.1
-7.3
1.9
20.0
-13
10
17
0.1
0.5
1
1
Symbols
Degrees
V pk-pk
V pk-pk
CMX981
D/981/1
Units
LSB
LSB
Bits
mV
k
pF
dB
dB
Hz
Hz
Hz
Hz
Hz
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB