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Automatic RF MESFET Amplifier
Drain-Current Controllers
Table 28b. LUT Configuration
BIT NAME
SIZE5
SIZE4
SIZE3
SIZE2
SIZE1
SIZE0
DATA BIT
D12
D11
D10
D9
D8
D7
RESET
0
0
0
0
0
0
FUNCTION
The SIZE field is a straight binary representation of the size of the respective LUT.
SIZE5 is the MSB of the 6 SIZE bits. SIZE0 is the LSB. Set the size of the LUT between
eight entries (001000) and 48 entries (110000).
The HYS2, HYS1, and HYS0 bits set the hysteresis bit threshold for each LUT. When
the difference between the last index value and the next index value is less than the
HYS2
D6
0
value set by HYS2, HYS1, and HYS0 bits, the LUT operation for that parameter is
omitted and the last value calculated for the respective LUT is used.
Set the HYS2 (MSB), HYS1, and HYS0 (LSB) bits to the following hysteresis bit values:
000: 0 bits (a new LUT operation is always performed)
001: 1 bit (if the value differs by 1 bit, a new LUT operation is performed)
010: 2 bits
HYS1
D5
0
011: 4 bits
100: 8 bits
101: 16 bits
110: 32 bits
HYS0
STEP3
STEP2
STEP1
STEP0
D4
D3
D2
D1
D0
0
0
0
0
0
111: 64 bits
The STEP3–STEP0 bits determine the LUT 12-bit step size. The step size is a 2 N value.
The N value is determined by the STEP bits, with STEP3 being the MSB and STEP0
the LSB. See Table 28c for the TLUT and KLUT step-size equivalents.
Table 28c. LUT Configuration Step Sizes
STEP3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
STEP2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
STEP1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
STEP0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LUT STEP SIZE
1
2
4
8
16
32
64
128
256
512
TLUT STEP-SIZE
EQUIVALENT
+0.125°C
+0.25°C
+0.5°C
+1°C
+2°C
+4°C
+8°C
+16°C
+32°C
+64°C
Reserved. Do not use.
Reserved. Do not use.
Reserved. Do not use.
Reserved. Do not use.
Reserved. Do not use.
Reserved. Do not use.
KLUT STEP-SIZE
EQUIVALENT
1
2
4
8
16
32
64
128
256
512
______________________________________________________________________________________
61
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