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Dual RF LDMOS Bias Controllers
with I 2 C/SPI Interface
Appendix: Recommended
Power-Up Code Sequence
The following section shows the recommended startup
code for the MAX1385. This code ensures clean startup
of the part, irrespective of power-supply ramp speed
and starts the device regulating to 312.5mV on both
channels. Change the THRUDAC writes to change the
voltage across the sense resistor. Note it should be run
after the power supplies have stabilized.
REGISTER
MNEMONIC
SHUT
REGISTER
ADDRESS (hex)
0x64
CODE
WRITTEN
0x0080
Removes the global power.
NOTES
Powers up all parts of the MAX1385 and forces the internal reference to
SHUT
0x64
0x0080
remain powered. The internal oscillator is required for the subsequent
reset command.
SCLR
SCLR
SCLR
SCLR
SHUT
0x68
0x68
0x68
0x68
0x64
0x0100
0x0200
0x0100
0x0200
0x0080
Arms the full reset.
Completes the full reset.
Arms the full reset.*
Completes the full reset.*
Removes the global power.
Powers up all parts of the MAX1385 and forces the internal reference to
SHUT
0x64
0x0080
remain powered. The internal oscillator is required for the subsequent
reset command.
DCFIG
0x30
0x000A
Selects internal references for both DAC and ADC.
Runs autocalibration on both PGA channels to set the input referred
PGACAL
0x4E
0x0002
offset to < 50μV. Busy goes low after approximately 30ms and then the
V GATE DACs can be set.
*Double reset. This ensures that the internal ROM is reset correctly after power-up and that the ROM data is latched correctly irre-
spective of power-supply ramp speed.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
52 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
? 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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