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PDF RF2461 Data sheet ( Hoja de datos )
| Número de pieza | RF2461 | |
| Descripción | CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHZ DOWNCONVERTER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RF2461 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Preliminary
8
Typical Applications
• CDMA/FM Cellular Systems
• Supports Dual-Mode AMPS/CDMA
• Supports Dual-Mode TACS/JCDMA
RF2461
CDMA/FM LOW NOISE AMPLIFIER/MIXER
900MHZ DOWNCONVERTER
• General Purpose Downconverter
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
Product Description
The RF2461 is a receiver front-end designed for the
receive section of dual-mode CDMA/FM cellular applica-
tions. It is designed to amplify and downconvert RF sig-
nals, while providing 30dB of stepped gain control range.
Features include digital control of LNA gain, mixer gain,
and power down mode. Another feature of the chip is
adjustable IIP3 of the LNA and mixer using an off-chip
current setting resistor. Noise figure, IP3, and other specs
are designed to be compatible with the IS-98B interim
standard for CDMA cellular communications. The IC is
manufactured on an advanced Silicon Germanium HBT
process and is in a 4mmx4mm, 20-pin, leadless chip car-
rier.
Optimum Technology Matching® Applied
Si BJT
Si Bi-CMOS
GaAs HBT
üSiGe HBT
GaAs MESFET
Si CMOS
20 19 18 17 16
LNA GAIN 1
15 IF2+
MIX GAIN 2
14 IF2-
LNA IN 3
13 BYPASS
VCC1 4
12 IF1+
GND1B 5
11 IF1-
6 7 8 9 10
Functional Block Diagram
1.00
0.90
0.60
0.24 typ
3 0.20
4.00
sq.
0.65
0.30
4 PLCS
2.10
sq.
12°
MAX
0.75
0.50
0.05
0.50
Dimensions in mm.
NOTES:
1 Shaded lead is Pin 1.
Note orientation of package.
2 Pin 1 identifier must exist on top surface of package by identification
mark or feature on the package body. Exact shape and size is optional.
3 Dimension applies to plated terminal: to be measured between 0.02 mm
and 0.25 mm from terminal end.
4 Package Warpage: 0.05 mm max.
5 Die Thickness Allowable: 0.305 mm max.
0.23
0.13
4 PLCS
Package Style: LCC, 20-Pin, 4x4
Features
• Complete Receiver Front-End
• Stepped LNA/Mixer Gain Control
• Adjustable LNA/Mixer Bias Current
• Adjustable LNA/Mixer IIP3
• Meets IMD Tests with Three Gain States/
Two Logic Control Lines
Ordering Information
RF2461
RF2461 PCBA
CDMA/FM Low Noise Amplifier/Mixer 900MHz
Downconverter
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
8
Rev A13 010607
8-123
1 page  
Preliminary
RF2461
Pin
15
Function
IF2+
Description
First differential output pin for the second mixer. Open collector. A cur-
rent combiner external network performs a differential to single-ended
conversion and sets the output impedance. A DC blocking cap must be
present if the IF filter input has a DC path to ground. Mixer (IF2+ and
IF2-) needs to “see” a differential impedance between 2kΩ to 4kΩ.
Interface Schematic
IF2- IF2+
16
VCC2
VCC pin for the LO buffer/bias circuitry.*
17
LO IN
LO limiter input pin.
LO IN
18 ENABLE This pin is used to enable or disable the RF2461. A logic high (>2.0V)
enables the circuitry. A logic low (<1.0V) disables the circuitry.
ENABLE
19
20
Pkg
Base
IP SET
IF SEL
GND
Controls the setting of the LNA current. A logic low (<1.0V) selects the
internal resistance (49.5kΩ), resulting in an LNA current of 5mA. A
logic high (>2.0V) selects the external resistance at pin 8.
Determines which IF port is active. A logic low (<1.0V) activates IF1
and deactivates IF2. A logic high (>2.0V) activates IF2 and deactivates
IF1.
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias.
IP SET
IF SEL
8
*The bias circuitry current drop when LO signal is not present. Total LO buffer/bias circuitry current is 7mA when LO sig-
nal is present.
Rev A13 010607
8-127
5 Page 
Preliminary
RF2461
LNA Gain, Noise Figure and IIP3 versus ICC -
LNA Only (LNA High Gain)
16.0 15.0
25.00
Mixer Gain, Noise Figure and IIP3 versus ICC -
Mixer (Mixer High Gain, LO=-7dBm)
10.00
14.0 10.0
12.0
5.0
10.0
0.0
8.0
-5.0
6.0 Gain (dB)
NF (dB)
-10.0
4.0 IIP3 (dBm)
2.0 -15.0
0.0 -20.0
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0
ICC (mA)
20.00
15.00
10.00
5.00
5.00
0.00
0.00
-5.00
-10.00
-15.00
-20.00
10.00
15.00
20.00
25.00
ICC (mA)
30.00
Gain (dB)
NF (dB)
IIP3 (dBm)
-5.00
35.00
-10.00
40.00
Resistor (R3) versus ICC (mA) -
200.0
LNA Only (LNA High Gain)
Resistor (R2) versus ICC - Mixer (Mixer High Gain,
200.0
LO=2170@-7dBm)
180.0
160.0
R3 (kohm)
180.0
160.0
R2 (kohm)
140.0
140.0
120.0
120.0
100.0
100.0
80.0 80.0
60.0 60.0
40.0 40.0
20.0 20.0
0.0
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0
ICC (mA)
0.0
10.0 15.0 20.0 25.0 30.0 35.0 40.0
ICC (mA)
Condition T=25oC, VCC=2.75V, RF=880 and 881MHz, LO=965MHz @-10dBm
MIXER_GAIN
LNA_GAIN1
LNA_GAIN2
IP_SET
0
1
1
IF_SEL
0
0
0
LNA GAIN
0
0
1
MIX GAIN
1
0
0
ENABLE
1
1
1
LNA Current=LNA Gain2-LNA-Gain1
8
Rev A13 010607
8-133
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RF2461.PDF ] | |
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