Rainbow Electronics MAX1386 - Manual (Page 46)

MAX1385/MAX1386
Dual RF LDMOS Bias Controllers
with I
2 C/SPI Interface
46 ______________________________________________________________________________________
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:
where FINECODE is the value written to the Fine
DAC1/DAC2 Input register, and LOWCODE is the value
V
FINECODE
V
LOWCODE
DACREF DACREF
2 2
18 8
Ч + Ч
USER WRITES TO THE ANALOG-TO-DIGITAL
CONVERSION REGISTER TO SET UP CONVERSION
SCAN OF ADCIN2, EXTERNAL TEMPERATURE
SENSOR2, AND PGAOUT2 ADCIN2 CONVERSION
RESULT STORED IN FIFO EXTERNAL TEMPERATURE
SENSOR 2
CONVERSION RESULT
STORED IN FIFO PGAOUT2
CONVERSION RESULT
STORED IN FIFO
END OF SCAN, REF
AND TEMP SENSOR
POWER DOWN
AUTOMATICALLY
2.0
µ
s ACQUISITION FOR ADCIN1
5.5
µ
s CONVERSION TIME FOR ADCIN1
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
TEMP CONVERSION
IN ~40µs
TEMP SENSOR POWERS UP AND ACQUIRES IN ~6.7
µ
s
INT REFERENCE POWERS
UP IN ~60µs
CNVST
INTERNAL
BUSY
t APUINT
t CNV11 t ACQ11
5.5
µ
s CONVERSION TIME FOR ADCIN2 2µ
s ACQUISITION OF ADCIN2
IDLE, BUT
REF STAYS
POWERED UP
Figure 24. ADC Clock Mode 11, Example 2
CNVST
USER WRITES TO THE ANALOG-TO-DIGITAL CONVERSION REGISTER
TO SET UP CONVERSION SCAN OF INTERNAL
TEMPERATURE, PGAOUT1, AND ADCIN1
INTERNAL
BUSY
INT REFERENCE POWERS
UP IN ~60µs
TEMP SENSOR POWERS UP AND ACQUIRES IN ~6.7
µ
s
TEMP CONVERSION
IN ~40µs
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
IDLE, BUT REF
AND TEMP
SENSOR STAY
POWERED UP
47
µ
s ACQUISITION FOR
PGAOUT1
5.5
µ
s CONVERSION TIME FOR PGAOUT1
2µ
s ACQUISITION FOR
ADCIN1
5.5
µ
s CONVERSION TIME
FOR ADCIN1
END OF SCAN, REF
AND TEMP SENSOR
POWER DOWN
AUTOMATICALLY
t ACQ11 t ACQ11
INTERNAL TEMPERATURE
CONVERSION RESULT IS
STORED IN FIFO PGAOUT1
CONVERSION RESULT
STORED IN FIFO ADCIN1
CONVERSION RESULT
STORED IN FIFO
t CNV11
Figure 23. ADC Clock Mode 11, Example 1