High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod

The MAX2023 low-noise, high-linearity, direct upconversion/downconversion quadrature modulator/demodulator is designed for single and multicarrier 1500MHz to 2300MHz DCS 1800/PCS 1900 EDGE, cdma2000®, WCDMA, and PHS/PAS base-station applications. Direct conversion architectures are advantageous since they significantly reduce transmitter or receiver cost, part count, and power consumption as compared to traditional IF-based double-conversion systems.

In addition to offering excellent linearity and noise performance, the MAX2023 also yields a high level of component integration. This device includes two matched passive mixers for modulating or demodulating in-phase and quadrature signals, two LO mixer amplifier drivers, and an LO quadrature splitter. On-chip baluns are also integrated to allow for single-ended RF and LO connections. As an added feature, the baseband inputs have been matched to allow for direct interfacing to the transmit DAC, thereby eliminating the need for costly I/Q buffer amplifiers.

The MAX2023 operates from a single +5V supply. It is available in a compact 36-pin TQFN package (6mm x 6mm) with an exposed pad. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range.

Applications

* Cable Modem Termination Systems (CMTS) * Digital and Spread-Spectrum Communication Systems * Fixed Broadband Wireless Access * Microwave Links * Military Systems * PHS/PAS Base Stations * Predistortion Transmitters and Receivers * Single and Multicarrier cdmaOne™ and cdma2000® Base Stations * Single and Multicarrier WCDMA/LTE/TD-LTE Base Stations * Single-Carrier DCS 1800/PCS 1900 EDGE Base Stations * Video-on-Demand (VOD) and DOCSIS® Compliant Edge QAM Modulation

* 1500MHz to 2500MHz RF Frequency Range

* Scalable Power: External Current-Setting Resistors Provide Option for Operating Device in Reduced-Power/Reduced-Performance Mode

* 36-Pin, 6mm x 6mm TQFN Provides High Isolation in a Small Package

* Modulator Operation:

* Meets GSM Spurious Emission of -75dBc at 600kHz Offset at POUT = +6dBm

* +23.5dBm Typical OIP3

* +61dBm Typical OIP2

* +16dBm Typical OP1dB

* -54dBm Typical LO Leakage

* 48dBc Typical Sideband Suppression

* -165dBc/Hz Output Noise Density

* Broadband Baseband Input of 450MHz Allows a Direct Launch DAC Interface, Eliminating the Need for Costly I/Q Buffer Amplifiers

* DC-Coupled Input Allows Ability for Offset Voltage Control

* Demodulator Operation:

* +38dBm Typical IIP3

* +59dBm Typical IIP2

* +30dBm Typical IP1dB

* 9.5dB Typical Conversion Loss

* 9.6dB Typical NF

* 0.025dB Typical I/Q Gain Imbalance

* 0.56° I/Q Typical Phase Imbalance