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PDF RF2890 Data sheet ( Hoja de datos )
| Número de pieza | RF2890 | |
| Descripción | DUAL-BAND CDMA CELLULAR/GPS LOW NOISE AMPLIFIER/MIXER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Typical Applications
• CDMA Cellular/GPS Applications
• JCDMA/GPS Applications
• AMPS/GPS Applications
RF2890
DUAL-BAND CDMA CELLULAR/GPS
LOW NOISE AMPLIFIER/MIXER
• CDMA Modem/Data Cards
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
Product Description
The RF2890 is a high performance dual band CDMA Cel-
lular and GPS LNA/mixer. An integrated optional LO pres-
caler allows VCO flexibility. The device is designed to
exceed all sensitivity, intermodulation and single-tone
requirements. The RF2890 is designed for three state
gain control solutions (17.5dB of gain control) for cellular
band IMD testing. The device offers a dedicated low cur-
rent (15.5mA) GPS LNA/mixer with 32.5dB gain. An inte-
grated TX LO buffer is also included. The design is
flexible, in that the bias currents may be set using off-chip
current reference resistors for the mixer and LNA blocks.
Noise figure, IIP3, and other specifications are designed
to be compatible with the TIA/EIA 98D standard for
CDMA cellular communications. The device is packaged
in a plastic, 4mmx4mm QFN.
Optimum Technology Matching® Applied
Si BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
InGaP/HBT
SiGe HBT
Si CMOS
9GaN HEMT
SiGe Bi-CMOS
24 23 22 21 20 19
CELL
LNA OUT
1
18 GPS IF+
CELL
LNA EMITTER
2
17 GPS IF-
CELL
LNA IN
3
16 CDMA IF+
GPS
LNA IN
4
/2 15 CDMA IF-
VG1 5
14
TX BUFF
ENAB
GPS
LNA OUT
6
13 LO OUT
7 8 9 10 11 12
Functional Block Diagram
-A-
3
4.00 SQ
2.00 TYP
0.15 C A
2 PLCS
0.15 C B
2 PLCS
2 PLCS
0.15 C B
0.15 C A
2 PLCS
0.05 C
0.90
0.85
0.70
0.65
0.05
0.00
1.87 TYP
3.75 SQ
Top View
0.60
0.24
TYP
-B-
0.10 M C A B
0.30 2
0.18
PIN 1 ID
0.20 R
12°
MAX
Dimensions in mm
0.50
0.30
TYP
2.49
2.19
SQ.
-C-
NOTES:
1 Shaded lead is pin 1.
SEATING
PLANE
0.50
Bottom View
2 Dimension applies to plated terminal: to be measured between 0.20 mm and 0.25 mm from terminal end.
3 Pin 1 identifier must exist on top surface of package by identification mark or feature on the package body.
Package Style: QFN, 24-Pin, 4x4
Features
• Optional Divide-by-Two LO Prescaler
allows VCO Flexibility
• Three Gain State Cellular LNA
• High IIP3 (8.5dBm) Cellular Mixer
• Full ESD Protection on all Pins
• 15.5mA GPS LNA/Mixer Solution
Ordering Information
RF2890
RF2890PCBA-410
Dual-Band CDMA Cellular/GPS Low Noise
Amplifier/Mixer
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A4 040421
8-409
1 page  
RF2890
Operation Mode Control Table
Mode
BAND SEL
Cellular CDMA
0
GPS
1
Gain Control Logic Table
Gain Setting
VG1 VG2
00
10
11
01
Cellular
LNA
High Gain
Mid Gain
Low Gain
Low Gain
Resulting Gain State
GPS
Comments
LNA
High Gain
Cellular CDMA IMD Test 1 and 2
High Gain
Cellular CDMA IMD Test 3 and 4
High Gain
Cellular CDMA IMD Test 5 and 6
High Gain
Cellular CDMA IMD Test 5 and 6
VCO Options and Divider Logic Table
Dual-Band Application
Dual VCO Configuration
2GHz CDMA VCO
1.4GHz GPS VCO
DIV SEL pin tied to BAND SEL
MODE
CONTROL PINS
DIV SELECT
BAND SEL
CDMA Cellular
0
0
GPS
11
Dual-Band Application
Dual VCO Configuration
1GHz CDMA VCO
1.4GHz GPS VCO
DIV SEL pin tied to VCC
MODE
CONTROL PINS
DIV SELECT
BAND SEL
CDMA Cellular
1
0
GPS
11
ON-CHIP LO PRESCALER RESULT
Divide-by-2
ON
OFF
ON-CHIP LO PRESCALER RESULT
Divide-by-2
OFF
OFF
Rev A4 040421
8-413
5 Page 
Single-End IF Matching
IF Output Interface Network
RF2890
IF+ 10
IF- 9
4
5
IF Saw
C3
VCC
100 pF
L2 L1
R
C1
IF+
C2
IF-
C1
L1, C1, C2, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency
and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to
the following equation:
fIF
=
-----------------------------1------------------------------
2π L--2--1--(C1 + 2C2 + CEQ)
Where CEQ is the equivalent stray capacitance and capacitance looking into pins 9 and 10. An average value to use for
CEQ is 2.5pF.
R can then be used to set the output impedance according to the following equation:
R
=
-4----⋅---R--1--O----U---T-
–
-R-1--P--
–1
where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1.
C2 should first be set to 0 and C1 should be chosen as high as possible (not greater than 39pF), while maintaining an RP
of L1 that allows for the desired ROUT. If the self-resonant frequencies of the selected C1 produce unsatisfactory linearity
performance, their values may be reduced and compensated for by including C2 capacitor with a value chosen to main-
tain the desired FIF frequency.
L2 and C3 serve dual purposes. L2 serves as an output bias choke, and C3 serves as a series DC block.
In addition, L2 and C3 may be chosen to form an impedance matching network if the input impedance of the IF filter is
not equal to ROUT. Otherwise, L2 is chosen to be large (suggested 120nH) and C3 is chosen to be large (suggested
22nF) if a DC path to ground is present in the IF filter, or omitted if the filter is DC-blocked.
Rev A4 040421
8-419
11 Page | ||
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| PDF Descargar | [ Datasheet RF2890.PDF ] | |
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