RF2418_1 [RFMD]
LOW CURRENT LNA/MIXER; 低电流低噪声放大器/混频器
| 型号： | RF2418_1 |
| 厂家： | 
RF MICRO DEVICES |
| 描述： | LOW CURRENT LNA/MIXER |
| 文件： | 总12页 (文件大小：282K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RF2418
LOW CURRENT LNA/MIXER
RoHS Compliant & Pb-Free Product
Package Style: SOIC-14
LNA
LNA IN 1
GND 2
14 LNA OUT
13 GND
12 GND
11 RF IN
10 GND
9 DEC
Features
Single 3V to 6.5V Power Sup-
ply
VDD1 3
High Dynamic Range
Low Current Drain
High LO Isolation
RF AMP
VDD2 4
10pF
IF BYP 5
IF2 OUT 6
IF1 OUT 7
LNA Power Down Mode for
Large Signals
BUFFER
MIXER
Applications
8 LO IN
UHF Digital and Analog
Receivers
Digital Communication Sys-
tems
Functional Block Diagram
Product Description
Spread-Spectrum Communi-
cation Systems
The RF2418 is a monolithic integrated UHF receiver front-end. The IC con-
tains all of the required components to implement the RF functions of the
receiver except for the passive filtering and LO generation. It contains an
LNA (low-noise amplifier), a second RF amplifier, a dual-gate GaAs FET
mixer, and an IF output buffer amplifier which will drive a 50Ω load. In
addition, the IF buffer amplifier may be disabled and a high impedance
output is provided for easy matching to IF filters with high impedances.
The output of the LNA is made available as an output to permit the inser-
tion of a bandpass filter between the LNA and the RF/Mixer section. The
LNA section may be disabled by removing the VDD1 connection to the IC.
Commercial and Consumer
Systems
433MHz and 915MHz ISM
Band Receivers
General Purpose Frequency
Conversion
Ordering Information
RF2418
Low Current LNA/Mixer
RF2418PCBA-41X Fully Assembled Evaluation Board
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
9
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
1 of 12
RF2418
Absolute Maximum Ratings
Caution! ESD sensitive device.
Parameter
Rating
Unit
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical perfor-
mance or functional operation of the device under Absolute Maximum Rating condi-
tions is not implied.
Supply Voltage
-0.5 to 7
V
DC
Input LO and RF Levels
+6
dBm
°C
Ambient Operating Temperature
Storage Temperature
-40 to +85
-40 to +150
RoHS status based on EUDirective2002/95/EC (at time of this document revision).
°C
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended appli-
cation circuitry and specifications at any time without prior notice.
Specification
Parameter
Overall
Unit
Condition
Min.
Typ.
Max.
T = 25°C, V =5V, RF=850MHz,
CC
LO=921MHz
RF Frequency Range
Cascade Power Gain
400 to 1100
MHz
dB
23
High impedance output
Referenced to the input
Cascade IP
-13
dBm
3
Cascade Noise Figure
2.4
dB
Single sideband, includes image filter with
1.0dB insertion loss
First Section (LNA)
Noise Figure
Input VSWR
Input IP3
1.8
1.5:1
+4.0
14
2.0
dB
With external series matching inductor
+3.0
13
dBm
dB
Gain
Reverse Isolation
Output VSWR
40
dB
1.5:1
High impedance output
Second Section (RF Amp,
Mixer, IF1)
Noise Figure
9.5
dB
Single Sideband
Input VSWR
1.5:1
With external series matching inductor
Input IP3
+1
9
dBm
dB
Conversion Power Gain
Output Impedance
7
4000||10pF
Ω
Open Collector
Buffered output, 50Ω load
Second Section (RF Amp,
Mixer, IF2)
Noise Figure
10
1.5:1
0
dB
Single Sideband
Input VSWR
With external series matching inductor
Input IP3
-0.5
5
dBm
dB
Conversion Gain
Output Impedance
6
30
Ω
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
2 of 12
Rev A7 DS060203
RF2418
Specification
Typ.
Parameter
Unit
Condition
Min.
Max.
LO Input
LO Frequency
LO Level
300 to 1200
-6 to +6
15
MHz
dBm
dB
LO to RF Rejection
LO to IF Rejection
LO Input VSWR
40
dB
With pin 5 connected to ground.
1.3:1
In order to achieve a low VSWR match at this
input, an 82Ω resistor to ground is placed in
parallel with this port.
Power Supply
Voltage
3.0
6.5
V
Current Consumption
14
20
9
mA
V
V
V
=5.0V, LNA On, Mixer On, Buffer Off
=5.0V, LNA On, Mixer On, Buffer On
=5.0V, LNA Off, Mixer On, Buffer Off
CC
CC
CC
12
6
26
20
mA
mA
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
3 of 12
RF2418
Pin
1
Function
LNA IN
Description
Interface Schematic
A series 10nH matching inductor is necessary to achieve specified gain
and noise figure at 900MHz. This pin is NOT internally DC-blocked. An
external blocking capacitor must be provided if the pin is connected to a
device with DC present. A DC path to ground (i.e. an inductor or resistor to
ground) is, however, acceptable at this pin. If a blocking capacitor is
required, a value of 22pF is recommended.
LNA IN
Ground connection. Keep traces physically short and connect immediately
to ground plane for best performance.
2
3
GND
Supply Voltage for the LNA only. A 22pF external bypass capacitor is
required and an additional 0.01μF is required if no other low frequency
bypass capacitors are near by. The trace length between the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.
VDD1
For large input signals, VDD1 may be disconnected, resulting in the LNA’s
gain changing from +11dB to -26dB and current drain decreasing by 4mA.
If the LNA is never required for use, then this pin can be left unconnected
or grounded, and Pin 11 is used as the first input.
Power supply for the IF buffer amplifier. If the high impedance mixer output
is being used, then this pin is not connected.
4
5
VDD2
If this pin is connected to ground, an internal 10pF capacitor is connected
in parallel with the mixer output. This capacitor functions as an LO trap,
which reduces the amount of LO to IF bleed-through and prevents high LO
voltages at the mixer output from degrading the mixer’s dynamic range. At
higher IF frequencies, this capacitance, along with parasitic layout capaci-
tance, should be parallel resonated out by the choice of the bias inductor
value at pin 7. If the internal capacitor is not connected to ground, the
buffer amplifier could become unstable. A ~10pF capacitor should be
added at the output to maintain the buffer’s stability, but the gain will not
be significantly affected.
IF BYP
50Ω buffered (open source) output port, one of two output options. Pin 7
6
7
IF2 OUT
IF1 OUT
must have a bias resistor to V and pin 6 must have a bias resistor to
DD
IF2 OUT
ground (see Buffered Output Application Schematic) in order to turn the
buffer amplifier on. Current drain will increase by approximately 8mA at
5V, and by approximately 5mA at 3V. It is recommended that these bias
resistors be less than 1kΩ.
High impedance (open drain) output port, one of two output options. This
pin must be connected to V through a resistor or inductor in order to
DD
bias the mixer, even when using IF2 Output. In addition, a 0.01μF bypass
capacitor is required at the other end of the bias resistor or inductor. The
ground side of the bypass capacitor should connect immediately to ground
plane. This output is intended to drive high impedance IF filters. The rec-
ommended matching network is shunt L, series C (see the application
schematic, high impedance output). This topology will provide matching,
bias, and DC-blocking.
IF1 OUT
Mixer LO input. A high-pass matching network, such as a single shunt
inductor (as shown in the application schematics), is the recommended
topology because it also rejects IF noise at the mixer input. This filtering is
required to achieve the specified noise figures. This pin is NOT internally
DC-blocked. An external blocking capacitor must be provided if the pin is
connected to a device with DC present. A DC path to ground (i.e. an induc-
tor or resistor to ground) is, however, acceptable at this pin. If a blocking
capacitor is required, a value of 22pF is recommended.
8
9
LO IN
LO IN
Connection for the external bypass capacitor for the mixer RF input
preamp. 1000pF is recommended. The trace length between the pin and
the capacitor should be minimized. The ground side of the bypass capaci-
tor should connect immediately to ground plane.
RF BYP
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
4 of 12
Rev A7 DS060203
RF2418
Pin
10
11
Function
GND
RF IN
Description
Same as pin 2.
Interface Schematic
Mixer RF Input port. For a 50Ω match at 900MHz use a 15nH series
inductor. This pin is NOT internally DC-blocked. An external blocking capac-
itor must be provided if the pin is connected to a device with DC present. A
DC path to ground (i.e. an inductor or resistor to ground) is, however,
acceptable at this pin. If a blocking capacitor is required, a value of 22pF is
recommended.To minimize the mixer’s noise figure, it is recommended to
have a RF bandpass filter before this input. This will prevent the noise at
the image frequency from being converted to the IF.
RF IN
Same as pin 2.
12
13
14
GND
GND
LNA OUT
Same as pin 2.
50Ω output. Internally DC-blocked.
LNA OUT
Package Drawing
0.156
0.148
0.010
.014
0.347
0.339
0.050
0.252
0.236
0.057
8° MAX
0° MIN
0.0500
0.0164
0.010
0.007
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
5 of 12
RF2418
Application Schematic
High Impedance Output Configuration
850MHz
I
m
a
g
e
F
i
l
t
e
r
1 0 n H
I
L N A
R F IN
F
1
2
3
4
5
6
7
1 4
1 3
1 2
1 1
1 0
9
5
0
F
i D
Ω
V
D
l
t
e
r
,
R F A M P
1 5 n H
1 0 0 n F
4 7 p F
1 0 p F
H
i
1
4
n F
p F
Z
B U F F E R
M IX E R
C 1
IF O U T
L O IN
8
L 1
1 0 n H
V
D
D
1 0 0 n F
L 1 a n d C 1 a r e p ic k e d to m a tc h th e m ix e r 's o u tp u t im p e d a n c e ( 4 k Ω II 1 0 p F ) to th e IF
filte r 's im p e d a n c e , a t th e IF fr e q u e n c y . C 1 a ls o s e r v e s a s
a D C b lo c k , in c a s e th e IF filte r is
n o t a n o p e n c ir c u it a t D C .
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
6 of 12
Rev A7 DS060203
RF2418
Application Schematic
Buffered Output Configuration
850MHz
I
m
a
g
e
F
i
l
t
e
r
,
1 0 n H
L N A
R F IN
1
2
3
4
5
6
7
1 4
1 3
1 2
1 1
1 0
9
5
0
Ω
V D D
R F A M P
1 5 n H
1 0 0 n F
4 7 p F
1 0 p F
C 1
R 1
1
4
n F
p F
IF O U T
B U F F E R
M IX E R
I
F
L O IN
8
1 0 n H
F
i
l
t
e
r
R 2
L 1
V D D
L 1 s h o u ld p a ra lle l re s o n a te , a t th e IF fre q u e n c y , w ith th e in te rn a l
1 0 p F c a p a c ito r p lu s a n y e x tra p a ra s itic la y o u t c a p a c ita n c e .
,
1 0 0 n F
1 0 0 n F
R 1 a n d R 2 a re b ia s re s is to rs th a t s e t th e b ia s c u rre n t fo r th e b u ffe r
a m p lifie r. T h e v a lu e re c o m m e n d e d is 5 1 0 W , e a c h . H ig h e r v a lu e s
w ill d e c re a s e th e c u rre n t c o n s u m p tio n b u t a ls o d e c re a s e th e o u tp u t
le v e l a t w h ic h v o lta g e c lip p in g b e g in s to o c c u r. A t lo w e r IF
fre q u e n c ie s , w h e re th e in te rn a l 1 0 p F c a p a c ito r d o e s n o t ro ll o ff th e
c o n v e rs io n g a in , L 1 m a y b e e lim in a te d .
5
0
Ω
C 1 is
a b lo c k in g c a p a c ito r, in c a s e th e IF filte r's in p u t is n o t a n o p e n
c irc u it a t D C .
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
7 of 12
RF2418
Evaluation Board Schematic
RF=850MHz, IF=71MHz
L3
10 nH
LNA
50 Ω μstrip
50 Ω μstrip
50 Ω μstrip
50 Ω μstrip
J1
LNA IN
J5
1
2
3
4
5
6
7
14
13
12
11
10
9
LNA OUT
R4
5.11 kΩ
L2
18 nH
RF AMP
P1-3
50 Ω μstrip
J4
RF IN
C3
47 pF
Jumper
E2 E1
see note
10pF
C2
1 nF
R3
610 Ω
J2
IF OUT
C5
BUFFER
MIXER
C1
0.1 μF
3 pF to 5 pF
J3
LO IN
8
L4
10 nH
TP1
see note
R1
300 Ω
L1
1 μH
C4
0.1 μF
2418400C
P1
1
NC
Notes:
2
3
GND
VDD
For high impedance output
1) Populate L1 and TP1
2) Remove jumper E1 to E2
P1-3
VDD
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
8 of 12
Rev A7 DS060203
RF2418
Evaluation Board Layout
Board Size 1.52” x 1.52”
Board Thickness 0.031”, Board Material FR-4
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support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
9 of 12
RF2418
High Impedance Mixer Gain versus Voltage, RF=850MHz
High Impedance Casc. Gain versus Voltage,
RF=850MHz
10.0
9.5
9.0
8.5
8.0
7.5
7.0
26.0
24.0
22.0
20.0
18.0
16.0
14.0
T =-40
T =26
T = 85
T =-40
T = 26
T = 85
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
6.5
6.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
6.5
6.5
Voltage (V)
Voltage (V)
High Impedance Mixer Input IP3 versus Voltage,
RF=850MHz
High Impedance Casc. Input IP3 versus Voltage,
RF=850MHz
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-10.0
-10.5
-11.0
-11.5
-12.0
-12.5
-13.0
-13.5
-14.0
-14.5
-15.0
T =-40
T = 26
T = 85
T =-40
T =26
T = 85
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Voltage (V)
Voltage (V)
Buffered LNA Gain versus Voltage,
RF=850MHz
Buffered Mixer Gain versus Voltage,
RF=850MHz
17.0
16.0
15.0
14.0
13.0
12.0
11.0
10.0
9.0
15.0
14.0
13.0
12.0
11.0
10.0
9.0
T =-40
T = 26
T = 85
8.0
T =-40
T = 26
T =85
7.0
8.0
6.0
7.0
5.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Voltage (V)
Voltage (V)
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
10 of 12
Rev A7 DS060203
RF2418
Buffered Casc. Gain versus Voltage,
RF=850MHz
Buffered LNA Input versus Voltage,
RF=850MHz
30.0
25.0
20.0
15.0
10.0
5.0
6.0
4.0
T =-40
T = 26
T =85
T =-40
T =26
T = 85
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
6.5
6.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Voltage (V)
Voltage (V)
Buffered Mixer Input IP3 versus Voltage,
RF=850MHz
Buffered Casc. Input IP3 versus Voltage,
RF=850MHz
2.0
1.5
-10.0
-11.0
-12.0
-13.0
-14.0
-15.0
-16.0
T =-40
T = 26
T = 85
T =-40
T =26
T = 85
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Voltage (V)
Voltage (V)
Buffered LNA Noise Figure versus Voltage,
RF=850MHz Part to Part Variation
Buffered Mixer Noise Figure versus Voltage,
RF=850MHz Part to Part Variation
2.0
1.8
1.6
1.4
11.0
10.5
10.0
9.5
Part 1
Part 2
Part 3
Part 4
Part 5
Part 1
Part 2
Part 3
Part 4
Part 5
9.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Voltage (V)
Voltage (V)
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A7 DS060203
11 of 12
RF2418
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
12 of 12
Rev A7 DS060203
相关型号：
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