STW81200 datasheet(40/58 Pages) STMICROELECTRONICS

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Circuit description

STW81200

40/58

DocID025943 Rev 7

ST4 Register

Address:

STW81200BaseAddress + 0x04

Type:

R/W

Description:

Lock det. control, Ref. Buffer, CP supply mode, VCO settings, Output power control

[26]

RESERVED: must be set to ‘0’

[25:23]

RF_OUT_PWR: RF output power control bit; set output power level of differential signal (valid

for both RF1 and RF2 outputs; measured @ 4 GHz). When VCC_RFOUT is supplied at 2.6 V

‘0’ and ‘1’ are the only values allowed.

000: (0) -1.0 dBm (-4.0 dBm on each single-ended signal)

001: (1) +1.0 dBm (-2.0 dBm on each single-ended signal)

010: (2) +2.5 dBm (-0.5 dBm on each single-ended signal)

011: (3) +3.5 dBm (+0.5 dBm on each single-ended signal)

100: (4) +4.5 dBm (+1.5 dBm on each single-ended signal)

101: (5) +5.5 dBm (+2.5 dBm on each single-ended signal)

110: (6) +6.5 dBm (+3.5 dBm on each single-ended signal)

111: (7) +7.0 dBm (+4.0 dBm on each single-ended signal)

[22]

VCO_2V5_MODE: to be set to ‘1’ when VCO core (pin #3) is supplied at 2.6 V

[21]

RESERVED: must be set to ‘0’

[20]

RESERVED: must be set to ‘0’

[19]

EXT_VCO_EN: external VCO Buffer enable

0: external VCO buffer disabled; integrated VCOs are used

1: external VCO buffer enabled; external VCO required (internal VCOs are powered down)

[18:15]

VCO_AMP: set VCO signal amplitude at the internal oscillator circuit nodes; higher signal level

gives best phase noise performance while lower signal level gives low current consumption.

Different ranges of value are available, based upon the supply voltage provided to pin

VCC_VCO_core (pin #3).

Allowed settings:

0000 to 0110: (0-6) when VCO core is supplied at 2.6 V

0000 to 1010: (0-10) when VCO core is supplied at 3.3 V

0000 to 1111: (0-15) when VCO core is supplied at 4.5/5 V

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