MAX1385 Datasheet, PDF (46/52 Pages) Maxim Integrated Products – Dual RF LDMOS Bias Controllers with I2C/SPI Interface

Dual RF LDMOS Bias Controllers
with I²C/SPI Interface
t_CNV11
CNVST
BUSY
t_ACQ11
t_ACQ11
INTERNAL
INT REFERENCE POWERS
UP IN ~60µs
TEMP CONVERSION
IN ~40µs
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
END OF SCAN, REF
AND TEMP SENSOR
POWER DOWN
AUTOMATICALLY
USER WRITES TO THE ANALOG-TO-DIGITAL CONVERSION REGISTER
TO SET UP CONVERSION SCAN OF INTERNAL
TEMPERATURE, PGAOUT1, AND ADCIN1
Figure 23. ADC Clock Mode 11, Example 1
CNVST
BUSY
t_APUINT
INTERNAL TEMPERATURE
CONVERSION RESULT IS
STORED IN FIFO
PGAOUT1
CONVERSION RESULT
STORED IN FIFO
ADCIN1
CONVERSION RESULT
STORED IN FIFO
t_CNV11
t_ACQ11
INTERNAL
INT REFERENCE POWERS
UP IN ~60µs
IDLE, BUT
REF STAYS
POWERED UP
TEMP CONVERSION
IN ~40µs
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
END OF SCAN, REF
AND TEMP SENSOR
POWER DOWN
AUTOMATICALLY
USER WRITES TO THE ANALOG-TO-DIGITAL
CONVERSION REGISTER TO SET UP CONVERSION
SCAN OF ADCIN2, EXTERNAL TEMPERATURE
SENSOR2, AND PGAOUT2
Figure 24. ADC Clock Mode 11, Example 2
ADCIN2 CONVERSION
RESULT STORED IN FIFO
EXTERNAL TEMPERATURE PGAOUT2
SENSOR 2
CONVERSION RESULT
CONVERSION RESULT STORED IN FIFO
STORED IN FIFO
3) Write to the Fine DAC1/DAC2 Write-Through Input
register without autocalibration (FINETHRU1/
FINETHRU2). If the coarse DAC1/DAC2 low wiper is
higher than the coarse DAC1/DAC2 high wiper,
invert the fine DAC1/DAC input register code.
The resulting output when the high wiper is higher than
the low wiper is shown below:
V_DACREF
2¹⁸
× FINECODE +
V_DACREF
2⁸
× LOWCODE
where FINECODE is the value written to the Fine
DAC1/DAC2 Input register, and LOWCODE is the value
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