MICRF405 datasheet(37/46 Pages) MICREL

37 / 46 page

Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

LDO_by

LDO_EN1

LDO_EN0

Comments

LDOs turned off, power applied to AVDD, DVDD, RFVDD, min/max is 2.0/2.5 V, and

to VDD pin 11 and 1, min/max is 2.0/3.6V.

LDOs bypassed, power applied to the VDD pin1 and VDD pin11, min/max is 2.0/2.5 V

PA LDO turned on, power applied to VDD pin1 and 11, min/max is 2.0/3.6V, and to

AVDD and DVDD, min/max is 2.0/2.5V

PA and AVDD LDO turned on, power applied to the VDD pin1 and 11, min/max is

2.0/3.6V, and to DVDD, min/max is 2.0/2.5V

PA, AVDD and DIG LDO turned on, power applied to the VDD pin1 and VDD pin 11,

min/max is 2.0/3.6V

Table 30. Low DropOut Voltage Regulator.

PA_LDc_en

Comments

PA is only controlled by Mode1 and Mode and PA0-2, PA on in transmit mode (Mode[1:0]=3 and PA[2:0]>0)

In transmit mode, PA is turned on by Lock Detect (LD=1 -> PA on). PA is turned off by load pulse or when

using openloop modulation and setting the DATAIN pin in tri-state. PA will be turned on again once LD goes

high again. LD_en must be set to 1.

Table 31. Lock Detect Controlled PA.

MOD_LDc_en

Comments

Modulation starts once frame length is written into data byte.

Modulation starts once frame length is written into data byte and PA is turned on and LD is high.

Table 32. Lock Detect Controlled Start of Modulation (only for BIT_IO_en=0).

PA_FEc_en

Comments

PA is turned off by Mode1 and Mode0 or PA0-2 and PA_LDc_en=0

PA is turned off immediately after the frame is transmitted.

Table 33. Frameend Controlled PA.

LD_en

State

Comments

LD off

Output is 0 volt, or test signals specified by OUTS[2:0]

LD on

LD pin high indicate that the PLL is locked

Table 34. Lock Detector.

SyncID_Len1

SyncID_Len0

Comments

SyncID length is 1 byte. SyncID0 is sent

SyncID length is 2 bytes. SyncID0 and SyncID1 is sent

SyncID length is 3 bytes. SyncID0, SyncID1 and SyncID2 is sent

SyncID length is 4 bytes. SyncID0, SyncID1, SyncID2 and SyncID3 is sent.

Table 35. SyncID Field Length.

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