MLX71122_16 Datasheet, PDF (15/59 Pages) Melexis Microelectronic Systems – 300 to 930MHz FSK/FM/ASK Receiver

MLX71122
300 to 930MHz FSK/FM/ASK Receiver
Datasheet
2.2. RF Pin Impedance Models
The following table gives the typical equivalent circuits modelling the impedance of the RF-pins including
the package but without the PCB parasitics.
The LNA, MIX1 and TNK1/2 models are valid from 300 to 930MHz, the MFO model is valid from 1 to
10MHz.
LNAI (GAIN=”10”)
LNAI
LNAGAIN=“10“
2.5p
LNAI (GAIN="11”)
LNAI
LNAGAIN=“11“
(default)
2.4p
LNAO (GAIN=”10”´& “11”)
LNAO
LNAGAIN=“10 & 11“
1.4p
0.56p
MIX1P & MIX1N
MIX1P
MIX1N
1.0p
MFO
MFO
MFO=“IFOUT
& ROOUT“
0.88p
TNK1/2
TNK1
1.1n
2.7
TNK2
1.1n
2.7
CVCO
VCORANGE=0 VCORANGE=1
VCC=3V
VCC=5V
V_LF / V C_VCO / pF
C_VCO / pF
0.0
6.50
6.20
0.5
6.40
6.10
1.0
6.10
6.05
1.5
4.80
5.75
2.0
3.60
5.10
2.5
3.05
4.40
3.0
2.80
3.75
3.5
-
3.20
4.0
-
2.65
4.5
-
2.45
5.5
-
2.35
7
6
5
4
3
2
VCORANGE=1; VCC=5V
1
VCORANGE=0; VCC=3V
0
0
1
2
3
4
5
voltage at pin LF / V
Fig. 2: C-V tuning characteristic of the VCO
The C-V-characteristics for other supply voltages than given above can be derived by shifting the right end
of the curves to the desired supply voltage, since the VCO frequency depends on V_CC-V_LF.
REVISION 014 – AUGUST, 2016
390 10 71122 01
Page 15 of 59