參數(shù)資料
型號(hào)： HSP50016JC-75
廠商： INTERSIL CORP
元件分類(lèi)： 數(shù)字信號(hào)處理外設(shè)
英文描述： Digital Down Converter
中文描述： 16-BIT, DSP-MIXER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 15/31頁(yè)
文件大?。?/td> 209K
代理商： HSP50016JC-75
3-212
TABLE 3. DESTINATION ADDRESS = 0
BIT
POSITION
FUNCTION
DESCRIPTION
39-37
Address
000 = Control Word 0
36
Update
0 = Update Only This Control Register
1 = Update All Control Registers
35-32
Reserved
All Zeroes
TABLE 4. PHASE GENERATOR/TEST ENABLE/OUTPUT REGISTER
DESTINATION ADDRESS = 1
BIT
POSITION
FUNCTION
DESCRIPTION
39-37
Address
001 = Control Word 1
36
Update
0 = Update Only This Control Register
1 = Update All Control Registers
35-4
Minimum Phase
Increment
Bits 35-4 = 2
31
...2
0
. 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:
f
c
= (phase increment)f
s
2
-33
;
where f
c
is the desired local oscillator frequency, f
s
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[f
c
/ f
s
)2
33
]hex
Some examples of phase increments and local oscillator frequencies:
00000000
h: f
c
= zero frequency
00000001
h: f
c
= f
s
/2
33
- lowest frequency (75MHz x 2
-33
= 8.73mHz)
10000000
h: f
c
= f
s
/32
20000000
h: f
c
= f
s
/16
40000000
h: f
c
= f
s
/8
80000000
h: f
c
= f
s
/4
ffffffff
h: f
c
= (0.49999)f
s
- 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
HSP50016
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