Operation Guide

OPERATION GUIDE.
OG_LMD-401_v10e Circuit Design, Inc. 8
BLOCK DIAGRAM
ＲＦ
HPF(L
・
C)
RF SW
SAW-FILTER
LNA
RX2.8V
Down
Converter
RX2.8V
TX2.8V
LNA
LNA
TX2.8V
Up
Converter
DIS(L
・
C
・
R)
ATT(R)
MCF
21.7MHz
±
7.5kHz
IF-IC
RX2.8V
IF FILTER
450kHz
±
4.5kHz
DISC
450kHz
Butterworth
character
Active Filte r
LPF(L
・
C)
RX2.8V
DATA SLICER/AMP
RX2.8V
DO
AFOUT
RSSI
BUFF
VCO
PLL
VCO2.8V
VCO2.8V
21.25MHz
VCO2.8V
TC-XO
(with VC)
DATA
CLK
LE
LD
LNA
VC-XO
21.7MHz
1
VCO2.8V
Power
adj.
Local
adj.
Deviation adj.
AMP
1
LPF
DI
VCO2.8V
REGULATOR
VCC
GND
REGULATOR
VCO2.8V
TXSEL
RXSEL
SWITCH
2.8V
TX2.8V
RX2.8V
OE CONTROL
OE
VCO2.8V
2.8V
1
AMP
VCO2.8V
SAW-FILTER
Electrostatic
protection
SAW-FILTER