LMX2216M National Semiconductor, LMX2216M Datasheet - Page 11

• Manufacturer Part Number: LMX2216M
• Description: IC AMP/MIXER LO NOISE 16-SOIC
• Manufacturer: National Semiconductor

Specifications of LMX2216M

• Current - Supply: 6.5mA ~ 8mA
• Frequency: 100MHz ~ 2GHz
• Gain: 9dB ~ 10dB
• Noise Figure: 4.8dB ~ 6dB
• P1db: -5dBm ~ -3dBm
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Rf Type: Cellular, WLAN, PCS, PHS, Cordless Phones
• Test Frequency: 2GHz
• Voltage - Supply: 2.85V ~ 3.15V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LMX2216M

higher than DSB noise figure
Figures of Merit
Due to the presence of image frequencies and the method
in which noise figure is defined noise figures can be mea-
sured and specified in two ways double side band (DSB) or
single side band (SSB) In DSB measurements the image
frequency component of the input noise source is not fil-
tered and contributes to the total output noise at the inter-
mediate frequency In SSB measurements the image fre-
quency is filtered and the output noise is not caused by this
frequency component In most mixer applications where
only one side band is wanted SSB noise figure is 3 dB
In this application the LMX2216 is used in a radio receiver
front end where it amplifies the signal from the antenna and
then down converts it to an intermediate frequency The
image filter placed between the LNA and the mixer attenu-
1
2
3
4
5
6
System Cumulative Values
Comp
Filter
Switch
LNA
Filter
Mixer
Filter
Data per Stage
b
b
b
b
Gain
12 3
(Continued)
2 0
0 6
3 0
5 8
3 0
Gain
N Fig
IIP
OIP
FIGURE 8 Typical Applications Circuit of the LMX2216
3
N Fig
3
13 7
2 0
0 6
3 7
3 0
3 0
b
FIGURE 9 Cascade Analysis Example
b
10 5 dBm
9 5 dB
9 7 dB
1 0 dBm
100 0
100 0
100 0
100 0
OIP3
6 0
3 0
11
ates the image frequency The mixer is shown to use an LO
signal generated by a PLL synthesizer but depending on
the type of application the LO signal could be generated by
a device as simple as a free-running oscillator The IF output
is then typically filtered by a channel-select filter following
the mixer and this signal can then be demodulated or go
through another down conversion depending upon the in-
termediate frequency and system requirements This exter-
nal filter rejects adjacent channels and also attenuates any
LO feed through Figure 9 shows a cascade analysis of a
typical RF front-end subsystem in which the LMX2216 is
used It includes the bandpass filter and the switch through
which the input RF signal goes in a radio system before
reaching the LNA Typical values are used for the insertion
loss of the various filters in this example
1
2
3
4
5
6
Gain
b
b
12 5
2 0
2 6
9 7
6 7
9 5
Cumulative Data
N Fig
2 0
2 6
6 3
6 4
9 6
9 7
b
b
IIP3
b
b
97 9
96 6
10 5
10 5
3 7
3 7
TL W 11814– 18
OIP3
b
95 9
94 0
6 0
3 0
2 0
1 0