RF2411TR7 RFMD, RF2411TR7 Datasheet - Page 3

• Manufacturer Part Number: RF2411TR7
• Description: IC AMP/MIXER LOW-NOISE 14-SOIC
• Manufacturer: RFMD

Specifications of RF2411TR7

• Rf Type: UHF
• Frequency: 500MHz ~ 1.9GHz
• Number Of Mixers: 1
• Gain: 25dB
• Noise Figure: 3.4dB
• Current - Supply: 8.5mA
• Voltage - Supply: 3 V ~ 6.5 V
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -

F IN
UT 1
UT 2
mixer performance at LO drive levels between -7dBm
and -4dBm.
A typical application is diagrammed in Figure 6. Similar
to many cellular phone receiver applications, a mono-
lithic image filter and interface to a differential IF filter
are utilized. The IC RF ports are not blocked to DC by
internal capacitors since the typical monolithic duplexer
and image filters do not present a DC path. The only
external components necessary in such an application
are the series inductor at the mixer RF port, a broad-
band AC bypass at the IC V
face components. The IF interface components can be
simply two chip inductors to power supply as shown,
connecting to a differential input SAW IF filter such as
the Sawtek 854596. The inductor value is chosen to
resonate with filter and circuit board stray capacitance
at the IF frequency. The mixer interface impedance is
set by the filter input impedance in this example circuit,
1000Ω (differential) for the Sawtek filter. Alternately,
impedance transformation may be included in the inter-
face circuit to a higher impedance to increase conver-
sion gain or to a lower impedance to increase mixer
1dB compression point. In all cases ground connec-
tions must be low inductance paths directly to a good
RF ground plane.
Figure 7 shows the dependence of overall cascaded
noise figure, gain, IIP3, and DC current drain on power
supply voltage for such a configuration at 880MHz RF
and 965MHz LO (85MHz 1000Ω differential IF inter-
Figure 6: Schematic for Typical Application
L2
V
CC
L1
100 pF
L3
1
2
3
4
5
6
7
MIXER
LNA
RF AMP
CC
pins, and the IF inter-
14
13
12
11
10
9
8
Copyright 1997-2002 RF Micro Devices, Inc.
100 pF
100 pF
100 pF
18 nH
50 Ω Image
Filter
300 pF
0.1 µF
V
L
face). The image filter loss is 3dB at 880MHz. Gain
can be seen to decrease from 24.8dB to 18.7dB as
V
8.8dBm to -20.5dBm largely due to the mixer. Noise
figure decreases from 4.4dB at 5V to a minimum of
3.3dB at 3V.
LO leakage to the LNA input is less than -43dBm with
0dBm LO input power. This value is less than the sum
of LNA and mixer reverse isolation, indicating degrada-
tion by a leakage mechanism external to the IC.
The RF2411 integrates the LNA and mixer of a high-
performance UHF receiver downconverter in a 14 lead
small outline plastic package. Its broadband character-
istics extend the useful frequency range from 500MHz
to 1900MHz frequency range. The flexible IF interface
accommodates single-ended and differential filters
from < 400kHz to > 200MHz. It is especially useful in
portable equipment, requiring the bare minimum of
external components to minimize total circuit size and
cost.
Figure 7: Cascaded Noise Figure, Gain, and IIP3,
and Current Drain vs. Supply Voltage
CC
is reduced from 5V to 2.5V. IIP3 decreases from -
-10
-15
-20
-25
30
25
20
15
10
-5
5
0
2.5
Frf = 880 & 881 MHz, Flo = 965 MHz @ -3 dBm, 3 dB loss image filter
3
3.5
RF2411 Cascaded Performance
Vcc (Volts)
TA0026
4
Conversion Gain
SSB NF
IIP3
4.5
15-123
5
15