Datasheet

MAX11014/MAX11015
Automatic RF MESFET Amplifier
Drain-Current Controllers
60 ______________________________________________________________________________________
When performing a write operation, the first 3 LUTDAT
bits, D15, D14, and D13 are don’t care. When perform-
ing a read operation, these bits are set to the LUT data
channel tag 110. Bits D12–D7 set the size of the LUT in
binary format. Set the LUT size between 8 (001000)
and 48 (110000). Bits D6, D5, and D4 set the hysteresis
bit threshold. Using the temperature LUT as an exam-
ple, if the HYS value is 101 (16 bits) and the latest tem-
perature measurement differs from the last one by more
than 2°C, a new TLUT operation is performed and a
new TLUT value is calculated. Bits D3–D0 set the LUT
step size. See Table 28c. The step size is based on the
value of 2
N
, with N equaling the digital value of the
STEP bits. Set the step size between 1 (2
0
) and 512
(2
9
). Locations 1010 (2
10
) to 1111 (2
15
) are reserved.
Do not write to these locations.
LUT Base
The following two-step sequence determines the
respective channel’s temperature or KLUT base value:
1) Set the LUTADD bits in the LUT address register to
C4h (TLUT1), C5h (TLUT2), C6h (KLUT1) and C7h
(KLUT2). See Table 28d.
2) Write to the LUT data register (LUTDAT15–
LUTDAT0) to initialize the base word. The KLUT
base 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.
LUTADD7–LUTADD0
HEX FUNCTION
0000 0000 to 0010 1111
00 to 2F
TLUT1-0 to TLUT1-47
0011 0000 to 0101 1111
30 to 5F
TLUT2-0 to TLUT2-47
0110 0000 to 1000 1111
60 to 8F
KLUT1-0 to KLUT1-47
1001 0000 to 1011 1111
90 to BF
KLUT2-0 to KLUT2-47
1100 0000 C0 TLUT1 configuration
1100 0001 C1 TLUT2 configuration
1100 0010 C2 KLUT1 configuration
1100 0011 C3 KLUT2 configuration
1100 0100 C4 TLUT1 base
1100 0101 C5 TLUT2 base
1100 0110 C6 KLUT1 base
1100 0111 C7 KLUT2 base
Table 28. LUT Addresses
LUTDAT15
LUTDAT0
ADDRESS
NAME
LUTADD7–
LUTADD0
(HEX)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
TLUT1
00 to 2F
110X
MSB — —————————LSB
TLUT2
30 to 5F
110X
MSB — —————————LSB
KLUT1
60 to 8F
110X
MSB — —————————LSB
KLUT2
90 to BF
110X
MSB — —————————LSB
TLUT1
Configuration
C0 1 1 0 See Table 28b for bit details.
TLUT2
Configuration
C1 1 1 0 See Table 28b for bit details.
KLUT1
Configuration
C2 1 1 0 See Table 28b for bit details.
KLUT2
Configuration
C3 1 1 0 See Table 28b for bit details.
TLUT1 Base
C4 1 1 0 X
MSB
—
—————————LSB
TLUT2 Base
C5 1 1 0 X
MSB
—
—————————LSB
KLUT1 Base
C6 1 1 0 X
MSB
—
—————————LSB
KLUT2 Base
C7 1 1 0 X
MSB
—
—————————LSB
Table 28a. LUT Data Register Memory Map
X = Don’t care.