AIS Baseband IC with/without RF Synthesiser
CMX7032/CMX7042
8.1.4 Parametric Performance
For the following conditions unless otherwise specified:
External components as recommended in Figure 2.
Maximum load on digital outputs = 30pF.
CLK Frequency = 19.2MHz (±20ppm); Tamb = 40°C to +85°C.
AV = DV = CPV = 3.0V to 3.6V; RFV = 2.25V to 2.75V.
DD
DD
DD
DD
Reference Signal Level = 300mV pk-pk with AV = 3.3V.
DD
Signal levels track with supply voltage, so scale accordingly.
Signal to Noise Ratio (SNR) in bit rate bandwidth.
Input stage gain = 0dB, Output stage attenuation = 0dB.
Transmit Parameters
Notes
Min.
Typ.
Max.
Unit
AIS (GMSK 9600bps), 25kHz channel
Bit rate accuracy
BT
Storage time (filter delay)
Tx Buffer size
–
–
–
–
–
0.4
8
±50
–
–
ppm
1
bits
bytes
–
176
Receive Parameters
AIS (GMSK 9600bps), 25kHz channel
Bit rate accuracy
Notes
Min.
Typ.
Max.
Unit
ppm
bits
–
–
–
–
–
–
–
–
–
0.4
8
–
–
–
–
–
±50
–
–
20%
20%
20%
2 x176
184
BT
Storage time
2
Packet error rate (PER) limit
PER with –10dB co-channel interference
PER with 10dB SNR
Rx Buffer Size (burst mode)
Rx Buffer Size (raw mode)
3
4
bytes
bytes
DSC (FSK 1200bps, 6dB/octave de-emphasis)
Bit rate accuracy
Sub-carrier
Tx mark frequency
Tx space frequency
–
–
1290
2090
–
–
1700
1300
2100
8
±50
–
1310
2110
–
ppm
Hz
Hz
Hz
bits
Storage time (filter delay)
Bit error rate (BER) with 10dB SNR
2
4
–
–
1%
SLOT CLOCK
Rise/Fall time
–
–
1.0
µs
Notes:
1.
2.
3.
4.
Through GMSK/FSK transmit filter.
Through GMSK/FSK receive filters.
Measured at baseband to IEC 62287-1.
Measured at baseband with simulated FM channel noise.
2012 CML Microsystems Plc
56
D/7032/42_FI1.2/13
CMLMICRO [ CML MICROCIRCUITS ]
