RF3854TR7 RFMD, RF3854TR7 Datasheet - Page 16

• Manufacturer Part Number: RF3854TR7
• Description: IC QUADRATURE MOD QUAD-BND 24QFN
• Manufacturer: RFMD

Specifications of RF3854TR7

• Function: Modulator
• Lo Frequency: 800MHz ~ 2GHz
• Rf Frequency: 800MHz ~ 2GHz
• P1db: 7dBm
• Noise Floor: -150dBm/Hz
• Current - Supply: 110mA
• Voltage - Supply: 2.7 V ~ 3.3 V
• Test Frequency: 2.11GHz
• Package / Case: 24-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Power: -
• Other names: 689-1029-2

RF3854
16 of 26
Base
Pkg
Pin
20
22
23
21
24
DIE FLAG
Function
MODE A
MODE B
I SIG P
I SIG N
VCC1
Description
Mode control pin. See the Logic Truth table.
CMOS Logic inputs: Logic 0=0V to 0.4V; Logic 1=1.4V to V
Supply for modulator, VGA and PA driver amplifiers.
In-phase I channel positive baseband input port.
Best performance is achieved when the ISIGP and ISIGN are driven differ-
entially with a 1.2V common mode DC voltage. The recommended differ-
ential drive level (V
modulation and 1.0V
This input should be DC-biased at 1.2V. In sleep mode an internal FET
switch is opened, the input goes high impedance and the modulator is de-
biased.
Phase or amplitude errors between the ISIGP and ISIGN signals will result
in a common-mode signal which may result in an increase in the even
order distortion of the modulation in the output spectrum.
DC offsets between the ISIGP and ISIGN signals will result in increased
carrier leakage. Small DC offsets may be deliberately applied between the
ISIGP/ISIGN and QSIGP/QSIGN inputs to cancel out the LO leakage. The
optimum corrective DC offsets will change with mode, frequency and gain
control.
Common-mode noise on the ISIGP and ISIGN should be kept low as it may
degrade the noise performance of the modulator.
Phase offsets from quadrature between the I and Q baseband signals
results in degrades sideband suppression.
In-phase I channel negative baseband input port. See pin 22.
Mode control pin. See the Logic Truth table.
CMOS Logic inputs: Logic 0=0V to 0.4V; Logic 1=1.4V to V
Ground for LO section, modular, biasing, variable gain amplifier, and sub-
strate.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
ISIGP
P-P
-V
for GMSK modulation.
ISIGN
) is 1.2V
P-P
for EDGE, 0.8V
P-P
CC
CC
W-CDMA
.
.
Interface Schematic
See pin 6.
See pin 22.
See pin 6.
LO Quadrature
Generator and
VCC1
GND1
V
CC2
Buffers
x1
Rev A1 DS070313