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RF3857 の電気的特性と機能

RF3857のメーカーはRF Micro Devicesです、この部品の機能は「DUAL CHANNEL LNA」です。


製品の詳細 ( Datasheet PDF )

部品番号 RF3857
部品説明 DUAL CHANNEL LNA
メーカ RF Micro Devices
ロゴ RF Micro Devices ロゴ 




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RF3857 Datasheet, RF3857 PDF,ピン配置, 機能
RF3857
DUAL CHANNEL LNA WITH BYPASS MODE
Package Style: QFN, 16-Pin, 3mmx3mmx0.45mm
Features
Low Noise and High Intercept
Point
Adjustable Bias Current
Power Down Control
Low Insertion Loss Bypass
Feature
1.8V to 4V Operation (See
“Bias Note” on Page 3)
0.9GHz to 4.0GHz Operation
Applications
WiFi LNA with Bypass Feature
WiMAX LNA with Bypass Fea-
ture
CDMA PCS LNA with Bypass
Feature
Suitable for 1x2 or 2x1
MIMO Applications
Commercial and Consumer
Systems
16
GAIN SEL1 1
GND 2
15 14
Logic Logic
Control Control
13
12 GAIN SELECT2
11 GND
RFOUT1 3
10 RFOUT2
N/C 4
9 N/C
5678
Functional Block Diagram
Product Description
The RF3857 is a dual channel switchable low noise amplifier with a very
high dynamic range designed for digital cellular, WiMAX, and WiFi applica-
tions. The device functions as an outstanding front end low noise ampli-
fier. The bias current may be set externally. The RF3857 combines two
receive paths, which is ideal in an application that requires two receive
paths, such as 1x2 and 2x2 MIMO for both WiFi and WiMax aplications.
The IC is featured in a standard QFN, 16-pin, 3mmx3mm plastic package.
DS110616
Optimum Technology Matching® Applied
GaAs HBT
SiGe BiCMOS
GaAs pHEMT
GaN HEMT
GaAs MESFET
Si BiCMOS
Si CMOS
RF MEMS
InGaP HBT
SiGe HBT
Si BJT
LDMOS
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 [email protected].
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1 Page





RF3857 pdf, ピン配列
RF3857
Parameter
Specification
Min. Typ. Max.
Unit
Condition
WiMAX Low Noise Amplifier,
cont.
Noise Figure
1.2 1.7 2.0 dB Over full temp range, frequency range, and pro-
cess.
IIP3 9 dBm
Total Current Drain (per channel)
8.5 10 mA Total current drain includes ICC+IREF.
VCC=3.3V, VREF=3.3V, Gain select<1.8V.
BYPASS MODE
Gain
Input IP3
Gain Select>1.8V, VREF=0V
-3 dB Note: Bypass mode insertion loss will degrade
gradually as VCC goes below 2.7V.
20 dBm
Total Current Drain (per channel)
Power Supply
2
mA Total current drain includes ICC+IREF
Voltage (VCC)
VSELECT Low
VSELECT High
Power Down per RX Path
1.8 3.0 5.0 V See bias note
0.8 V High Gain mode.
Gain Select<0.8V, VREF=3.3V
1.8 V Low Gain mode.
Gain Select>1.8V, VREF=0V
0 10 A Gain Select<0.8V, VREF=0V, VCC=3.3V (Over
full temp range, frequency, and beta)
VREF1 or VREF 2 Turn On/Off
100
<150
nSec
For faster turn on and off time C1 and C2
should be changed from 22nF to a value
between 10pF to 100pF
Gain Select 1 or 2 Turn On/Off
100
<150
nSec
For faster turn on and off time C1 and C2
should be changed from 22nF to a value
between 3.0pF to 100pF
Bias note: Due to the presence of ESD protection circuitry on the RF3857, the maximum allowable collector bias voltage (pin 4) is 4.0V. Higher
supply voltages such as 5V are permissible if a series resistor is used to drop VCC to <4.0V for a given ICC.
DS110616
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
3 of 11


3Pages


RF3857 電子部品, 半導体
RF3857
Evaluation Board Schematic
WiBRO/WiFi (2.3GHz to 2.7GHz)
C7
10 nF
C8
100 pF
L1
1.5 nH
C10
1.5 pF
C9
DNI
R1
0 50  strip
R2
0
VCC1
J3
RFOUT1
GAIN SEL1
J1
RFIN1
J2
RFIN2
50  strip
C1
22 nF
50  strip
C2
22 nF
4
5
6
7
8
9
321
16
Logic
Control
Logic
Control
15
14
13
10 11 12
R3
1.8 k
R4
1.8 k
VREF1
VREF2
GAIN SEL2
R5
0
J4
C5
DNI
L2
1.5 nH
C6
1.5 pF
R6
0
50  strip
RFOUT2
C3
100 pF
C4
10 nF
VCC2
Note: for best turn on and OFF time for both RX paths C1 and C2 should be changed to a value between 10pF to 100pF.
6 of 11
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
DS110616

6 Page



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