HSP50016 データシートの表示（PDF） - Intersil
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HSP50016 Datasheet PDF : 31 Pages
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BIT
POSITION
FUNCTION
39-37
Address
36
Update
35-32
Reserved
HSP50016
TABLE 3. DESTINATION ADDRESS = 0
000 = Control Word 0
0 = Update Only This Control Register
1 = Update All Control Registers
All Zeroes
DESCRIPTION
TABLE 4. PHASE GENERATOR/TEST ENABLE/OUTPUT REGISTER
DESTINATION ADDRESS = 1
BIT
POSITION
FUNCTION
DESCRIPTION
39-37
Address
001 = Control Word 1
36
35-4
Update
Minimum Phase
Increment
0 = Update Only This Control Register
1 = Update All Control Registers
Bits 35-4 = 231...20. Range: 0 < Minimum Phase Increment < π (1-2-32) radians.
In the CW mode this is the phase increment of the NCO which is added to the NCO intitial phase offset
state. The desired Sin/Cos generator (local oscillator) frequency is set by the equation:
fc = (phase increment)fs2-33;
where fc is the desired local oscillator frequency, fs is the input sampling frequency, and phase increment
is the control word value in hexidecimal.
To calculate the value to be programmed into this field, use this equation:
phase increment = INT[fc / fs)233]hex
Some examples of phase increments and local oscillator frequencies:
00000000h:
00000001h:
fc
fc
=
=
zero frequency
fs /233 - lowest
frequency
(75MHz
x
2-33
=
8.73mHz)
10000000h: fc = fs /32
20000000h: fc = fs /16
40000000h: fc = fs /8
80000000h:
ffffffffh:
fc
fc
=
=
fs /4
(0.49999)fs
-
highest
frequency
(75MHz
x
2-33
=
37.49MHz)
In the CHIRP modes, this is the smallest allowable phase increment.
In the Filter Only mode, this parameter should be set to 0.
3
Test Enable
0 = Test Features Disabled
1 = Test Features Enabled
2-0
Phase Generator Mode 000 = Filter Only
001 = Normal Mode (CW)
010 = Reserved
011 = Up Chirp
100 = Reserved
101 = Down Chirp
110 = Reserved
111 = Up/Down Chirp
Note that the lsb sets the gain through the DDC as follows:
0 = Gain is1
1 = Gain is 2
3-212
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