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High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2500MHz Quadrature Mod/Demod
Pin Description
PIN
1, 5, 9 –12, 14, 16 –19, 22,
24, 27 –30, 32, 34, 35, 36
NAME
GND
Ground
FUNCTION
2
RBIASLO3 3rd LO Amplifier Bias. Connect a 301
resistor to ground.
3
VCCLOA
LO Input Buffer Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1 μF
capacitors as close as possible to the pin.
4
LO Local Oscillator Input. 50
input impedance. Requires a DC-blocking capacitor.
6
7
RBIASLO1 1st LO Input Buffer Amplifier Bias. Connect a 432
N.C. No Connection. Leave unconnected.
resistor to ground.
8
RBIASLO2 2nd LO Amplifier Bias. Connect a 562
resistor to ground.
13
15
VCCLOI1
VCCLOI2
I-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF
capacitors as close as possible to the pin.
I-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1 μF
capacitors as close as possible to the pin.
20
21
23
25
26
BBI+ Baseband In-Phase Noninverting Port
BBI- Baseband In-Phase Inverting Port
RF RF Port. This port is matched to 50 . Requires a DC-blocking capacitor.
BBQ- Baseband Quadrature Inverting Port
BBQ+ Baseband Quadrature Noninverting Port
31
33
EP
VCCLOQ2
VCCLOQ1
GND
Q-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF
capacitors as close as possible to the pin.
Q-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1 μF
capacitors as close as possible to the pin.
Exposed Ground Pad. The exposed pad MUST be soldered to the ground plane using
multiple vias.
Detailed Description
The MAX2023 is designed for upconverting differential
in-phase (I) and quadrature (Q) inputs from baseband
to a 1500MHz to 2500MHz RF frequency range. The
device can also be used as a demodulator, downcon-
verting an RF input signal directly to baseband.
Applications include single and multicarrier 1500MHz to
2500MHz DCS/PCS EDGE, WCDMA/LTE/TD-LTE,
cdma2000, and PHS/PAS base stations. Direct conver-
sion architectures are advantageous since they signifi-
cantly reduce transmitter or receiver cost, part count,
and power consumption as compared to traditional
IF-based double-conversion systems.
The MAX2023 integrates internal baluns, an LO buffer,
a phase splitter, two LO driver amplifiers, two matched
double-balanced passive mixers, and a wideband quad-
rature combiner. The MAX2023’s high-linearity mixers, in
conjunction with the part’s precise in-phase and quadra-
ture channel matching, enable the device to possess
excellent dynamic range, ACLR, 1dB compression point,
and LO and sideband suppression characteristics. These
features make the MAX2023 ideal for single-carrier GSM
and multicarrier WCDMA/LTE/TD-LTE operation.
10
LO Input Balun, LO Buffer, and
Phase Splitter
The MAX2023 requires a single-ended LO input, with a
nominal power of 0dBm. An internal low-loss balun at
the LO input converts the single-ended LO signal to a
differential signal at the LO buffer input. In addition, the
internal balun matches the buffer’s input impedance to
50 Ω over the entire band of operation.
The output of the LO buffer goes through a phase split-
ter, which generates a second LO signal that is shifted
by 90° with respect to the original. The 0° and 90° LO
signals drive the I and Q mixers, respectively.
LO Driver
Following the phase splitter, the 0° and 90° LO signals
are each amplified by a two-stage amplifier to drive the
I and Q mixers. The amplifier boosts the level of the LO
signals to compensate for any changes in LO drive lev-
els. The two-stage LO amplifier allows a wide input
power range for the LO drive. The MAX2023 can toler-
ate LO level swings from -3dBm to +3dBm.
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