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

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

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

◁

Dual RF LDMOS Bias Controllers

with I2C/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.

MNEMONIC

SHUT

ADDRESS (hex)

0x64

CODE

WRITTEN

0x0080

Removes the global power.

NOTES

SHUT

0x64

0x0080

Powers up all parts of the MAX1385 and forces the internal reference to

remain powered. The internal oscillator is required for the subsequent

reset command.

SCLR

SHUT

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.

SHUT

0x64

0x0080

Powers up all parts of the MAX1385 and forces the internal reference to

remain powered. The internal oscillator is required for the subsequent

reset command.

DCFIG

0x30

0x000A

Selects internal references for both DAC and ADC.

PGACAL

0x4E

0x0002

Runs autocalibration on both PGA channels to set the input referred

offset to < 50ÂµV. Busy goes low after approximately 30ms and then the

VGATE 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

Maxim is a registered trademark of Maxim Integrated Products, Inc.