MAX2023ETX Maxim Integrated Products, MAX2023ETX Datasheet - Page 8

• Manufacturer Part Number: MAX2023ETX
• Description: Modulator / Demodulator High-Dynamic-Range D irect Up-/Downconver
• Manufacturer: Maxim Integrated Products

High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod
The MAX2023 is designed for upconverting differential
in-phase (I) and quadrature (Q) inputs from baseband
to a 1500MHz to 2300MHz 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
2300MHz DCS/PCS EDGE, UMTS/WCDMA, cdma2000,
and PHS/PAS base stations. Direct conversion archi-
tectures are advantageous since they significantly
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 operation.
8
1, 5, 9–12, 14, 16–19, 22,
24, 27–30, 32, 34, 35, 36
________________________________________________________________________________________________
PIN
EP
13
15
20
21
23
25
26
31
33
2
3
4
6
7
8
Detailed Description
RBIASLO3 3rd LO Amplifier Bias. Connect a 300Ω resistor to ground.
RBIASLO1 1st LO Input Buffer Amplifier Bias. Connect a 432Ω resistor to ground.
RBIASLO2 2nd LO Amplifier Bias. Connect a 562Ω resistor to ground.
VCCLOQ2
VCCLOQ1
VCCLOI1
VCCLOI2
VCCLOA
NAME
BBQ+
BBQ-
GND
BBI+
GND
N.C.
BBI-
LO
RF
Ground
LO Input Buffer Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1µF
capacitors as close to the pin as possible.
Local Oscillator Input. 50Ω input impedance. Requires a DC-blocking capacitor.
No Connection. Leave unconnected.
I-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1µF
capacitors as close to the pin as possible.
I-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1µF
capacitors as close to the pin as possible.
Baseband In-Phase Noninverting Port
Baseband In-Phase Inverting Port
RF Port. This port is matched to 50Ω. Requires a DC-blocking capacitor.
Baseband Quadrature Inverting Port
Baseband Quadrature Noninverting Port
Q-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1µF
capacitors as close to the pin as possible.
Q-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1µF
capacitors as close to the pin as possible.
Exposed Ground Paddle. The exposed paddle MUST be soldered to the ground plane
using multiple vias.
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
50Ω 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.
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.
FUNCTION
LO Input Balun, LO Buffer, and
Pin Description
Phase Splitter
LO Driver