TH71221 datasheet(22/44 Pages) MELEXIS

22 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 22 of 44

Data Sheet

Rev. 009

Nov/15

5.1.2 A – word

Name

Bits

Description

[9:0]

Reference divider ratio in RX operation mode

4d .. 1023d

OPMODE

[11:10]

Operation mode

Standby mode

Receive mode

Transmit mode

Idle mode

#default

LNAGAIN

[12]

LNA gain

low LNA gain

high LNA gain

#default

This selection is valid if bit LNACTR (bit 21 in C-word) is set to internal LNA gain control.

not used

[13]

set to ‘1’ for correct function

TXPOWER

[15:14]

Output power steps

#default

PACTRL

[16]

Set the PA-on condition

PA is switched on if the PLL locks

PA is always on in TX mode

#default

LOCKMODE

[17]

Set the PLL locked state observation mode

before lock only

#default

Locked state condition will be ascertained only one time afterwards the LD signal remains in

high state.

before and after lock

locked state will be observed permanently

CPCUR

[18]

Charge Pump output current

260 µA

1300 µA

#default

MODSEL

[19]

Modulation mode

ASK

FSK

#default

This selection is valid if bit MODCTRL (bit 21 in D-word) is set to internal modulation

control.

DTAPOL

[20]

Input data polarity

normal

#default

‘0’ for space at ASK or fmin at FSK, ‘1’ for mark at ASK or fmax at FSK

inverse

‘1’ for space at ASK or fmin at FSK, ‘0’ for mark at ASK or fmax at FSK

IDLESEL

[21]

Active blocks in IDLE mode

only RO active

whole PLL active

#default

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