TH71221 datasheet(24/44 Pages) MELEXIS

24 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 24 of 44

Data Sheet

Rev. 009

Nov/15

5.1.4 C – word

Name

Bits

Description

[16:0]

Feedback divider ratio in RX operation mode

64d .. 131071d

BAND

[17]

Set the desired frequency range

recommended at fRF < 500 MHz

recommended at fRF > 500MHz

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

operations.

VCOCUR

[19:18]

VCO active current

low current (300 µA)

standard current (500 µA)

high1 current (700 µA)

high2 current (900 µA)

PFDPOL

[20]

Phase Detector polarity

negative

#default

positive

neg

pos

FREQUENCY

OUTPUT

VCO

VCO INPUT VOLTAGE

LNACTRL

[21]

LNA gain control mode

external LNA gain control

#default

LNA gain will be set via pin GAIN_LNA.

internal LNA gain control

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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