RF2475PCBA View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2475PCBA' PDF : 20 Pages View PDF
Preliminary
RF2475
Truth Table of Pin-by-Pin Biasing
Pin #
1
28
8
9
Pin
Name
Biased
by VCC
Supply
Mode
LNA
VCC19
RX19
VCC
LNA
OUT19
RX19
VCC
LNA
VCC8
RX8
VCC
LNA
OUT8
RX8
VCC
RX-800
L
L
H
H
RX-1900 H
H
L
L
TX-800
L
L
L
L
TX-1900
L
L
L
L
12
MXR
VCC19
RX19
VCC
L
H
L
L
14
TX
LO19
TX19
VCC
L
L
L
H
L = Supply Off
H = Supply On
15
VCC
TX19
TX19
VCC
16
DOUBLER
VCC
PLL
VCC
18
IF B
IF
VCC
L
H
H
L
H
H
L
H
L
H
H
L
19
IF A
IF
VCC
H
H
L
L
22
VCC
TX8
TX8
VCC
L
L
H
L
23
TX
LO8
TX8
VCC
25
MXR
VCC8
RX8
VCC
L
H
L
L
H
L
L
L
Power Control Modes
Mode Pin Name Pin # Controls the Following Circuit Functions
RX19
LNA VCC19
1
1900MHz LNA Bias
MXR VCC19 12
Mixer RF Amplifier
Mixer LO Driver
RX LO Doubler
Doubler VCC 16
IF B
18
DC Return for the LO Doubler
DC Return for Mixer
8
IF A
19
DC Return for Mixer
RX8
LNA VCC8
8
800MHz LNA Bias
MXR VCC8
25
Mixer RF Amplifier
Mixer LO Driver
IF B
18
DC Return for Mixer
IF A
19
DC Return for Mixer
TX8
VCC TX8
22
800MHz TX LO Buffer
TX19
VCC TX19
15
1900MHz TX LO Buffer
TX LO Doubler
Doubler VCC 16
DC Return for the LO Doubler
NOTES:
There are separate RX/TX LO doublers with a common output.
The DC return path for both the TX and RX doublers is via the PLL VCC which is on in all TX and RX modes.
This allows sharing of the LC load at the doubler output, which saves a significant amount of die area.
Rev A2 010918
8-95
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