Sundance SMT349 - Manual (Page 13)

Version 2.1 Page 13 of 32 SMT349 User Manual
6.1 Digital control specifications
RX-AGC - done using 2x31 dB att. 1dB resolution
(10 digital control bits, 5x2)
TX-AGC – done using 1x31 dB att. 1dB resolution
(5 digital control bits)
Frequency setting
(3 wires serial interface)
Switches and mode configuration Rx/Tx switch
(1 digital control bit)
6.2 Signal filtering performances of the SMT349:
70MHz BPF characteristics
-1dB .............................................. +/-8 MHz
-20dB BW ........................................ +/-12 MHz
-50dB BW ........................................ +/-15 MHz
Pass Band Ripple ............................ 1dB maximum
Fix RF group delay variation .................... 100nSec maximum, any 1MHz band
IF BPF characteristics
-1dB BW .......................................... +/-8 MHz
-20dB BW ........................................ +/-20 MHz
-50dB BW ........................................ +/-30 MHz
Group Delay variation...................... 100nSec maximum
Ripple .............................................. 1dB maximum
7 Communication resources
It is strongly advised to read the Sundance help file to understand the principle of the
Sundance communication resources and their connectivity principles.
7.1 Comports
The FPGA module has two comports, numbered 0 and 3. The default firmware only
implements CP3
The addresses of the Comport registers are described in the SMT6400 help file .
Control commands from the host are received via comports.
7.2 SHB
The SMT349 has two SHB connectors, both of which are connected to the FPGA to
give 2x 16-bit SDB interfaces. These interfaces operate with a fixed clock rate of
100MHz.