TH71221 datasheet(24/44 Pages) MELEXIS

tên linh kiện	TH71221

Giải thích chi tiết về linh kiện	27 to 930MHz FSK/FM/ASK Transceiver

PDF	44 Pages

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nhà sản xuất	MELEXIS [Melexis Microelectronic Systems]

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24 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 24 of 44

Data Sheet

Rev. 005

June/07

5.1.4

C – word

Name

Bits

Description

Feedback divider ratio in RX operation mode

[16:0]

64d .. 131071d

Set the desired frequency range

recommended at fRF < 500 MHz

recommended at fRF > 500MHz

BAND

[17]

Some tail current sources are linked to this bit in order to save current for low frequency

operations.

VCO active current

VCOCUR

[19:18]

low current (300 µA)

standard current (500 µA)

high1 current (700 µA)

high2 current (900 µA)

Phase Detector polarity

PFDPOL

[20]

negative

#default

positive

neg

pos

FREQUENCY

OUTPUT

VCO

VCO INPUT VOLTAGE

LNA gain control mode

external LNA gain control

#default

LNA gain will be set via pin GAIN_LNA.

internal LNA gain control

LNACTRL

[21]

LNA gain will be set via bit LNAGAIN (bit 12 in A-word). Nevertheless pin GAIN_LNA must

be connected to either VCC or VEE.

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