MAX11008 Datasheet, PDF (50/67 Pages) Maxim Integrated Products – Dual RF LDMOS Bias Controller with Nonvolatile Memory

Dual RF LDMOS Bias Controller with
Nonvolatile Memory
Set T_AVG to 1 to enable the temperature averaging
and filtering function for channel 1 and channel 2. The
TSRC_ field in the SCFG register controls the source of
the sample.
Set TALARM_ to 1 to enable and to 0 to disable the
alarm function for channel 1 and channel 2 temperature
measurements.
Set TWIN_ to 0 to configure the channel 1 and channel 2
temperature alarms for hysteresis mode, and set TWIN_
to 1 to configure the channel 1 and channel 2 tempera-
ture alarms for window mode. See the Hysteresis Mode
and Window Mode sections for detailed descriptions of
each alarm mode. Use the Alarm Hardware
Configuration register to set the value of hysteresis when
in window mode (see Tables 14 and 14a).
Set IALARM_ to 1 to enable and to 0 to disable the
alarm function for channel 1 and channel 2 current
measurements.
Set IWIN_ to 0 to configure the channel 1 and channel
2 current-sense alarm for hysteresis mode, and set
IWIN_ to 1 to configure the channel 1 and channel 2
current-sense alarm for window mode. See the
Hysteresis Mode and Window Mode sections for
detailed descriptions of each alarm mode. Use the Alarm
Hardware Configuration register to set the value of hys-
teresis when in window mode (see Tables 14 and 14a).
Software Configuration Register (SCFIG)
(Read/Write)
Bits D[15:0] in the Software Configuration register (see
Table 13) control the parameters that trigger V_{GATE_}
calculations, how the results of the V_{GATE_} calculation
are applied (APC and/or temperature compensation),
and whether the calculation result is written to the DAC
input register only or to both input and output registers.
The register also determines the source of the APC and
temperature parameters, which are used to calculate
the LUT pointer for retrieving LUT values (see the
Temperature/APC LUT Configuration Registers sec-
tion). The data stored in the Software Configuration reg-
ister can be initialized from the EEPROM. Table 13d
summarizes all of the possible V_{GATE_} calculation trig-
ger conditions that can be set by the Software
Configuration register.
Set T2AVGCTL to 1 to enable the channel 2 averaging-
equation bit. The T2AVGCTL bit controls the averaging
equation for channel 2 while the device is in tracking
mode. The T2AVGCTL bit only affects the tracking
mode of the averaging. The bit does not affect the
acquirement of the initial average. The initial average
always requires 16 samples to generate a valid aver-
age. Set T2AVGCLT to 0 for average plus 1/16 of the
difference. Set T2AVGCLT to 1 for average plus 1/4 of
the difference. See Table 13a.
Program T2LIMIT[2:0] to enable and set the difference
limiter for channel 2 temperature averaging. The chan-
nel 2 temperature average must be enabled for the
contents of the T2LIMIT[2:0] field to have any effect on
the measured data (see the Alarm Software
Configuration Register (ALMSCFIG) (Read/Write) sec-
tion). The T2LIMIT[2:0] field only affects the tracking
mode of the average function. When tracking the aver-
age, the difference between the current average and
the new sample is calculated. The difference is then
added into the average according to the T2AVGCTL
bit, but before being added the difference is limited
according to the T2LIMIT[2:0] field. See Table 13b.
Set LDAC_ to 0 to load the V_{GATE_} calculation result
into the channel 1 and channel 2 DAC input and output
registers, forcing the V_{GATE_} output to change as soon
as the V_{GATE_} calculation is completed. Set LDAC_ to 1
to load the calculation result into the channel 1 and
channel 2 DAC input registers. Transfer the results from
the input register to the output register by writing to the
Load DAC register (see the Load DAC Register (LDAC)
(Write Only) section).
Set TCOMP_ to 1 to allow V_{GATE_} calculations to be
triggered by changes in channel 1 and channel 2 tem-
perature measurements. In this mode, the V_{GATE_} cal-
culation includes a temperature LUT value. The
temperature measurement values that trigger V_{GATE_}
calculations depend on the settings of T_HIST[3:0] in
the APC Parameter register.
Set APCCOMP_ to 1 to allow V_{GATE_} calculations to be
triggered by changes in channel 1 and channel 2 cur-
rent-sense measurements or the APC parameter in the
APC Parameter register. In this mode, the V_{GATE_} cal-
culation includes an APC LUT value. The current mea-
surement values that trigger V_{GATE_} calculations
depend on the settings of A_HIST[3:0] in the APC
Parameter register.
Set TSRC_ to 0 to use the channel 1 and channel 2
external temperature sensor as the source of the temper-
ature parameter for V_{GATE_} calculations. Set TSRC_ to 1
to use the internal temperature sensor as the source of
the temperature parameter for V_{GATE_} calculations.
Set APCSRC[1:0] to select the source of the APC para-
meter used for V_{GATE_} calculations (see Table 13c).
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