th71221 Melexis Company, th71221 Datasheet - Page 24

• Manufacturer Part Number: th71221
• Description: Transceiver - 27 To 930mhz, Fsk/fm/ask, Multi-channel 32l Qfn 5x5 Quad
• Manufacturer: Melexis Company

5.1.4
39010 071221
Rev. 006
LNACTRL
VCOCUR
PFDPOL
BAND
Name
NR
C – word
[19:18]
[16:0]
Bits
[17]
[20]
[21]
64d .. 131071d
00
01
10
11
0
1
0
1
0
1
recommended at f
recommended at f
Some tail current sources are linked to this bit in order to save current for low frequency
operations.
low current (300 µA)
standard current (500 µA)
high1 current (700 µA)
high2 current (900 µA)
negative
#default
positive
external LNA gain control
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.
Feedback divider ratio in RX operation mode
Page 24 of 44
FREQUENCY
Set the desired frequency range
OUTPUT
RF
RF
VCO
Phase Detector polarity
< 500 MHz
> 500MHz
LNA gain control mode
VCO active current
VCO INPUT VOLTAGE
Description
FSK/FM/ASK Transceiver
pos
neg
TH71221
27 to 930MHz
Data Sheet
#default
June/08