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Preliminary
8-95
RF2475
Rev A2 010918
8
Truth Table of Pin-by-Pin Biasing
Power Control Modes
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.
Pin #
1
28
8
9
121415
16
18192223
25
Pin
Name
LNA
VCC19
LNA
OUT19
LNA
VCC8
LNA
OUT8
MXR
VCC19
TX
LO19
VCC
TX19
DOUBLER
VCC
IF B
IF A
VCC
TX8
TX
LO8
MXR
VCC8
Biased
by VCC
Supply
RX19
VCC
RX19
VCC
RX8
VCC
RX8
VCC
RX19
VCC
TX19
VCC
TX19
VCC
PLL
VCC
IF
VCC
IF
VCC
TX8
VCC
TX8
VCC
RX8
VCC
Mode
RX-800
LL
H
H
LLL
H
H
HL
L
H
RX-1900
H
HL
L
HL
L
H
H
HL
L
L
TX-800
L
LLL
LLL
HL
L
H
HL
TX-1900
L
LLL
L
H
H
HL
L
L
L
L
L =
Supply Off
H=
Supply On
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
DC Return for the LO Doubler
IF B
18
DC Return for Mixer
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
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