ISL5239 Datasheet, PDF (28/31 Pages) Intersil Corporation – Pre-Distortion Linearizer

ISL5239
BIT
FUNCTION
15:8 Reserved
7:0
Coefficient Address
TABLE 36. COEFFICIENT INDEX
TYPE: CORRECTION FILTER, ADDRESS: 0x29
DESCRIPTION
Not used.
Pointer to current LUT location. Default is 0. 0x00-0x7F are I coefficients, 0x80-0xff are Q coefficients.
Master register to slave register transfer occurs after the processor interface last write to the Q
coefficient. The circuit uses the slave registers. All reads are from the slave register values. There are
13 each I and Q coefficients.
BIT
FUNCTION
15:0 Coefficient Data
TABLE 37. COEFFICIENT VALUE
TYPE: CORRECTION FILTER, ADDRESS: 0x2a
DESCRIPTION
Coefficient data access. Default = 0, non centered coef. Default = 1 - 2^(1-15) centered coef.
TABLE 38. STATUS
TYPE: CORRECTION FILTER, ADDRESS: 0x2b
BIT
FUNCTION
DESCRIPTION
15:4 Reserved
Not used.
3:2
Reserved
Internal use only.
1
I Channel Saturation
When high indicates the correction filter saturated at least one sample since the last control word 0x28,
bit 2 command.
0
Q Channel Saturation When high indicates the correction filter saturated at least one sample since the last control word 0x28,
bit 2 command.
BIT
FUNCTION
15:8 Reserved
8
Reserved
7:4
Output Word Width
3
Output Format
2
Status clear
1
Bypass
0
Reserved
TABLE 39. CONTROL
TYPE: OUTPUT DATA CONDITIONER, ADDRESS: 0x30
DESCRIPTION
Not used.
Internal use only.
Select the width of the output data bus IOUT<17:0> and QOUT<17:0>.
0000 - 8 bits
0001 - 9 bits
0010 - 10 bits
0011 - 11 bits
0100 - 12 bits
0101 - 13 bits
0110 - 14 bits
0111 - 15 bits
1000 - 16 bits
1001 - 17 bits
1010 - 18 bits (default)
Set high to select offset binary, low to select 2’s compliment.
Set high to clear all status bits, low to enable bits to be active.
Set high (default) to bypass, low to enable output processing.
Not used.
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