ISL5217_05 Datasheet, PDF (29/43 Pages) Intersil Corporation – Quad Programmable Up Converter

ISL5217
BIT
FUNCTION
15:0 Carrier Phase Offset
TABLE 23. CARRIER PHASE OFFSET (15:0)
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x07
DESCRIPTION
Initializes the most-significant 16-bits of the phase accumulator. The carrier phase offset is computed by
the formula:
Carrier Phase Offset (15:0) = INT [(Phase Offset 0 / 3600 * 2³²)) /216]
BIT
FUNCTION
15:0 Carrier NCO
TABLE 24. CARRIER FREQUENCY (31:16) MSW
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x08
DESCRIPTION
CF(31:16) is loaded in this address.
TABLE 25. CARRIER FREQUENCY (15:0) LSW
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x09
BIT
FUNCTION
DESCRIPTION
15:0 Carrier NCO
CF(15:0) is loaded in this address. The SIN/COS generator is controlled by a 32-bit NCO clocked at the
output clock rate. The center frequency is computed by the formula:
f_C
=
CF(31:0)
x
fCLK
x
-32
2;
CF(31:0)
=
INT(fC/fCLK
X
32
2 ).
NOTE: Writing to the LSW generates the update strobe to load the slave configuration reg when in the immediate mode
BIT
15
14:12
11:0
TABLE 26. GAIN
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x0a
FUNCTION
DESCRIPTION
Reserved
Not Used.
Step Atten (2:0)
Select 1 of 8 fixed attenuations
000 - scale by 4096
001 - scale by 256
010 - scale by 32
011 - scale by 16
100 - scale by 8
101 - scale by 4
110 - scale by 2
111 - scale by 1
Unsigned Gain Multiplier
The gain multiplier is computed by the formula:
Gain(11:0) =[10 ^{|(Gain(db)| / 20 )}2¹²]Hex
Bit weight. 2^-1 2^-2... 2^-12
Maximum 0xFFF = 1.0 - 2-12 _=0.9998
0x800 = 0.5
0x001 = 2^-12
Minimum 0x000 = 0.0
BIT
FUNCTION
8:7
Gain Profile Latency
6:0
Gain Profile Length
TABLE 27. GAIN PROFILE
TYPE: SINGLE CHANNEL DIRECT, ADDRESS: 0x0b
DESCRIPTION
Set bit 7 high to remove two edge latencies from the delay path. This should be combined DS=3, IP=4
settings to provide perfect symmetry through the gain block. Set bit 8 high to bypass all latency alignment
circuitry and to use TXENX as input to the channel.
Set to the upper address used for the gain profile RAM.
29
FN6004.3
July 8, 2005