Automatic RF MESFET Amplifier
Drain-Current Controllers
Table 28d. LUT Base
BIT NAME
DATA BIT
RESET STATE
FUNCTION
The base value signifies the starting point for the LUT. The KLUT base
BASE11–BASE0
D11–D0
N/A
value is stored in binary format, with the LSB equaling 1. The TLUT base
value is stored in two’s-complement format, with the LSB equaling
+0.125°C.
KLUT2BASE
KLUT1BASE
TLUT2BASE
TLUT1BASE = 1111 0001 0000 (-30?C)
KLUT2CNFG
KLUT1CNFG
TLUT2CNFG
T LUT1CNFG = 0 0100 0xxx 0111
TLUT1 VALUE 8 = UNUSED
0xC7
0xC6
0xC5
0xC4
0xC3
0xC2
0xC1
0xC0
0x08
+82 ° C
+66 ° C
+50 ° C
+34 ° C
+18 ° C
+2 ° C
-14 ° C
TLUT1BASE = -30 ° C
Figure 29. TLUT Example
TLUT1 VALUE 7
TLUT1 VALUE 6
TLUT1 VALUE 5
TLUT1 VALUE 4
TLUT1 VALUE 3
TLUT1 VALUE 2
TLUT1 VALUE 1
TLUT1 VALUE 0
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
Both the T and KLUTs contain 12-bit data. The TLUT
data is stored in two’s-complement format with decimal
values ranging from -2048/2048 (-1) to +2047/2048
(+0.9995) in steps of approximately 0.0005.
The KLUT data is stored in binary format with decimal
values ranging from 0 to +4095/4096 (0.9998) in steps
of approximately 0.0002.
The temperature LUT data is stored in two’s-complement
format. Figure 29 details a channel 1 TLUT example with
eight entries where the base temperature is -30°C and
the step size is 128 (+16°C between each entry).
62
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