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PDF RF2861PCBA-410 Data sheet ( Hoja de datos )
| Número de pieza | RF2861PCBA-410 | |
| Descripción | CDMA LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Typical Applications
• CDMA/JCDMA Cellular Systems
• CDMA450 Handsets/Data Cards
• AMPS Cellular Systems
RF2861
CDMA LOW NOISE AMPLIFIER/MIXER
900MHz DOWNCONVERTER
• General Purpose LNA and Downconverter
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
Product Description
The RF2861 is a receiver front-end for CDMA cellular
applications, including JCDMA and CDMA450. It is
designed to amplify and downconvert RF signals, using a
three gain state LNA to obtain 17dB of stepped gain con-
trol. Features include digital control of LNA gain and
power down mode, along with an integrated TX LO buffer
amplifier. Another feature of the chip is adjustable IIP3 of
the LNA and mixer using off-chip current setting resistors
to allow for minimum DC current consumption. Noise fig-
ure, IIP3, and other specs are designed to be compatible
with the TIA/EIA 98D standard for CDMA cellular commu-
nications. The IC is manufactured on an advanced Silicon
Germanium Bi-CMOS process and is in a 3mmx3mm,
16-pin, 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
16 15 14 13
G2 1
12 LO IN
LNA IN 2
11 GND
LNA EMITTER 3
10 IF OUT-
LNA OUT 4
9 IF OUT+
5678
Functional Block Diagram
0.10 C A
-A-
3.00
2 PLCS
1.50 TYP
2 PLCS
0.10 C B
0.70
0.65
0.05 C
0.90
0.85
0.05
0.00
3.00
2 PLCS
0.10 C B
2 PLCS
0.10 C A
2.75 SQ
-B-
1.37 TYP
0.60
0.24
TYP
NOTES:
1. Shaded lead is pin 1.
2 Dimension applies to plated terminal: to be measured
between 0.20 mm and 0.25 mm from terminal end.
12°
MAX
Dimensions in mm.
SEATING
-C- PLANE
0.10 M C A B
0.30
0.18 2
PIN 1 ID
R.20
1.65
1.35
SQ.
0.50
0.30
0.50
Package Style: QFN, 16-Pin, 3x3
Features
• 3mmx3mm LNA/Mixer Solution
• Adjustable LNA and Mixer Current/IIP3
• Meets IMD Tests with Three Gain
States/Two Logic Control Pins
• Integrated TX LO Buffer Amplifier
• Full ESD Protection on all Pins
Ordering Information
RF2861
CDMA Low Noise Amplifier/Mixer 900MHz Down-
converter
RF2861 PCBA-410 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 A2 040107
8-1
1 page  
RF2861
Gain Control Logic Table
Gain State
ENABLE
G1
G2
High Gain
100
Mid Gain
110
Low Gain
111
Low Gain (alternate)
101
NOTES: All IDC current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
TX Buffer On: Add 2mA to total current.
Cell Band Cascaded Performance High Mixer Gain Nominal IIP3 (Typical Values for VCC=2.75V)
NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
Parameter
CELL CDMA
LNA (High Gain)
LNA (Mid Gain)
LNA (Low Gain)
Cascaded:
Gain (dB)
25.0 16.5
8.0
Noise Figure (dB)
2.1 6.3 12.5
Input IP3 (dBm)
-5.6 +2.0 +11.4
Total Current (mA)
25.0 21.5 18.0
NOTE: Assumes 2.5dB image filter insertion loss. The TX Buffer is off.
Cell Band Cascaded Performance Nominal Mixer Gain High IIP3 (Typical Values for VCC=2.75V)
Parameter
CELL CDMA
LNA (High Gain)
LNA (Mid Gain)
LNA (Low Gain)
Cascaded:
Gain (dB)
22.5 14.0
5.5
Noise Figure (dB)
2.1 6.3 12.5
Input IP3 (dBm)
-3.7 +3.5 +13.3
Total Current (mA)
25.0 21.5 18.0
NOTE: Assumes 2.5dB image filter insertion loss. The TX Buffer is off.
CDMA450 Band Cascaded Performance (Typical Values for VCC=2.75V)
Parameter
CDMA450
LNA (High Gain)
LNA (Mid Gain)
LNA (Low Gain)
Cascaded:
Gain (dB)
24.5 12.0
5.5
Noise Figure (dB)
2.2 8.5 14.0
Input IP3 (dBm)
-7.6 +4.5 +11.3
Total Current (mA)
29.5 25
21
NOTE: Assumes 2.5dB image filter insertion loss. The TX Buffer is off.
Rev A2 040107
8-5
5 Page 
RF2861
Evaluation Board Schematic
CDMA450 Band
J1
CELL LNA IN
VCC
J2
CELL LNA OUT
ENABLE
TX BUFF
ENABLE
C46
33 nF
VCC
J6
LO OUT
P1-1
C54
33 nF
L17
2.2 nH
C6
33 nF
C55
33 nF
16 15 14 13
C7
33 nF
C4
33 nF
C25
33 nF
L1
33 nH
G2
L24
5.6 nH
L21
27 nH
1
2
3
4
12
11
C5
10
C35
9
R2
2.7 pF
5678
R6
6.8 kΩ
C3
+ C20
1 uF
L11
P1
1 VCC1 P2-1
2 GND P2-2
P2
1 ENABLE
2 TX BUF EN
3 GND P2-3 3 G1
CON3
P2-4 4 G2
J5
LO IN
CON4
L6 VCC
C17
C22
J4
CDMA IF
R4
22 kΩ
C2
33 nF
Freq IF Freq LO C3 C5 C35 R2 L11 L6 C22 C17
(MHz) (MHz) (pF) (pF) (pF) (kΩ) (nH) (nH) (nF) (pF)
85 549 91 91 DNI 6.8 68 270 33 27
L3
33 nH
G1
C9
2.2 pF
C1
33 nF
C8
DNI J3
CELL MIX IN
Rev A2 040107
8-11
11 Page | ||
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