HDSP-3400 Agilent(Hewlett-Packard), HDSP-3400 Datasheet - Page 42

• Manufacturer Part Number: HDSP-3400
• Description: 20 mm (0.8 inch) Seven Segment Displays
• Manufacturer: Agilent(Hewlett-Packard)

6. Register Definitions
6.1 Write Registers
ADDRESS (Hex)
00, 01, 02
03
04, 05, 06
42
Symbol Timing Frequency
The 20 bit straight binary number in this field establishes the symbol
timing frequency utilized within the demodulator. Bit 7 of address 00 is
the MSB and bit 4 of address 02 is the LSB. If Rs is the symbol rate
and f
the integer portion of R s (2
Symbol Timing Loop Gain Control
This field establishes the K1 and K2 gain values for the second order
loop filter of the symbol tracking loop. Bits 0,1 and 2 determine the
straight-through gain, and bits 4,5,6 and 7 determine the integration
path gain. The nominal value of this parameter in Hex, is expressed
below for different ranges of symbol rate to clock rate ratios:
Symbol Rate/Clock
0.75 - 0.40
0.40 - 0.20
0.20 - 0.10
0.10 - 0.05
0.05 - 0.025
0.025 - 0.016
Carrier Frequency
The 20 bit, two's complement number in this field establishes the
nominal carrier frequency of the demodulator. Bit 7 of address 04 is the
MSB and bit 4 of address 06 is the LSB. The number in this 20 bit field
multiplied by the clock frequency divided by 2
in Hertz. When the carrier sweep function is active, this value defines
the starting frequency.
c
is the clock frequency, the value to be stored in this 20 bit field is
Value
61
20
72
94
83
B6
A5
)/f c.
20
is the carrier frequency