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Número de pieza | RF3334 | |
Descripción | IF LOW NOISE AMPLIFIER/MIXER | |
Fabricantes | RF Micro Devices | |
Logotipo | ||
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Typical Applications
• Cable Set Top Box
• General Purpose Downconverter
RF3334
IF LOW NOISE AMPLIFIER/MIXER
• Commercial and Consumer Systems
Product Description
The RF3334 is an IF LNA/Mixer suitable for downconver-
sion of forward channel control data in a set-top box appli-
cation. It consists of a single-ended 75Ω terminated LNA,
followed by a differential gain control stage with 30dB of
analog gain control and a double-balanced mixer. The
mixer load is available via pins 10 and 11 should an exter-
nal filter be required. The mixer output is connected to an
IF amplifier that can be configured from 10dB to 40dB
gain with an external resistor. The amplifier is capable of
6V pk-pk output into a 1kΩ load.
Optimum Technology Matching® Applied
Si BJT
9Si Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
16 15 14 13
RFDEC 1
12 RFAGC
RFIN 2
11 MIXLOAD
2 PLCS
-A- 0.10 C A
4.00 SQ.
2.00 TYP
0.70
0.65
0.10 C B
2 PLCS
0.05 C
0.90
0.85
0.05
0.00
0.10 C B
2 PLCS
0.10 C A
2 PLCS
3.75 SQ
0.60
0.24
TYP
12°
MAX
-B-
1.87 TYP
-C-
Shaded lead is pin 1.
Dimensions in mm.
0.35
0.23
0.10 M C A B
Pin 1 ID
0.20 R
SEATING
PLANE
2.25
1.95
SQ.
0.75 TYP
0.50
0.65
Package Style: QFN, 16-Pin, 4x4
Features
• 30dB RF Gain Control
• 40dB IF Gain Control
• 5dB Max. Noise Figure SSB
• LNA Input Internally Matched to 75Ω
• Single 5V Supply
GND 3
IFVCC 4
IF AMP
10 MIXLOADB
9 GND
5678
Ordering Information
RF3334
LNA Mixer
RF3334 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A5 031020
8-457
1 page RF3334
Pin
12
13
Function
RFAGC
LO
Description
RF Gain select voltage input. The voltage applied to this pin sets the
gain of the RF amplifier. The voltage applied to this pin should be
between 0.5V and 4.5V. The RF gain characteristic is such that 0.5V
yields a gain of -2dB and 4.5V yields a gain of +30dB as measured
from the input of the LNA to the output of the mixer stage.
Differential LO Input. This pin and pin 14 (LOB) are the differential LO
inputs. This input should be AC-coupled. The differential input imped-
ance across pins 13 and 14 is 75Ω. The LO may be driven single
ended but will require a higher drive level. If a single ended LO is
applied, pin 14 should be AC-coupled to ground.
Interface Schematic
RFAGC
100 kΩ
10 kΩ
VREF
VBIAS
LOB
300 Ω
300 Ω
LO
75 Ω
14
LOB
Complementary LO Input. Should be AC-coupled.
VBIAS
LOB
300 Ω
300 Ω
LO
75 Ω
15
16
GND
GND
RFVCC
Paddle
Ground.
5V supply for RF section.
Backside of package should be connected to ground.
Rev A5 031020
8-461
5 Page LNA + AGC + Mixer Gain versus Control Voltage over
Temperature (Freq = 100 MHz, VCC = 5.0 V)
35.0
30.0
25.0
20.0
15.0
10.0
5.0
-40°C
0.0 +25°C
+85°C
-5.0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
RFAGC (V)
SSB, Cascaded Noise Figure versus Gain over
Temperature (Freq = 100 MHz, VCC = 5.0 V)
35.0
-40°C
+25°C
30.0
+85°C
25.0
20.0
15.0
10.0
5.0
0.0
25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0
Gain (dB)
LO Input VSWR versus Temperature Across
Temperature (VCC = 5.0 V)
1.75
1.70
1.65
1.60
1.55
1.50
118.00
128.00
138.00
148.00
158.00
Frequency (MHz)
-40°C
+25°C
+85°C
168.00
178.00
Rev A5 031020
RF3334
LNA + AGC + Mixer + IF AMP - IIP3 versus Gain over
Temperature (Freq = 100 MHz, VCC = 5.0 V)
90.0
88.0
86.0
84.0
82.0
80.0
78.0
76.0
74.0 -40°C
+25°C
72.0
+85°C
70.0
30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0
Gain (dB)
RF Input VSWR versus Frequency Across Temperature
(VCC = 5.0 V)
1.40
1.38
1.36
1.34
1.32
1.30
1.28
1.26
1.24
1.22
1.20
70.00
80.00
-40°C
+25°C
+85°C
90.00
100.00
110.00
Frequency (MHz)
120.00
130.00
8-467
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet RF3334.PDF ] |
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