Analog Devices Inc./Maxim Integrated MAX2361EGM

Overview

MAX2361EGM from Maxim Integrated is a dual-band, triple-mode complete quadrature transmitter IC for cellular handsets, integrating I/Q modulator, dual IF VGAs, dual synthesizers (IF/RF), dual IF VCOs, image-reject upconverter, RF VGA, and three PA drivers. It delivers +9dBm linear RF output power with 100dB power-control range, supports CDMA/cdma2000/TDMA/W-CDMA/GAIT mobile phones, and operates across 800–1000MHz (RFL) and 1700–2000MHz (RFH0/RFH1) bands.

For engineers reviewing the MAX2361EGM datasheet, MAX2361EGM pinout, MAX2361EGM application, or MAX2361EGM equivalent, key selection considerations include its dual IF frequency support (120–380MHz), SPI/QSPI/MICROWIRE-compatible 3-wire interface, integrated IF/RF PLL charge-pump control, and open-collector PA driver outputs requiring external pullup inductors for RF matching.

Technical Context

The MAX2361EGM implements a cascaded architecture: differential I/Q baseband inputs feed a quadrature modulator generating IF (120–380MHz), which is routed to dual differential IF outputs (IFOUTL+/− or IFOUTH+/−) for external bandpass filtering before single-sideband upconversion. Two independent IF VCOs (TANKL+/− and TANKH+/−) support low/high IF bands, each selectable via VCO_SEL register bit.

Upconversion uses external LO signals (LOL at 800–1150MHz, LOH at 800–2360MHz) applied to image-reject mixers driving RF VGAs and three dedicated PA drivers (RFL, RFH0, RFH1). Gain control is unified via analog GC pin (0.6V–2.4V), enabling simultaneous IF/RF gain adjustment over 85dB (IF) and 40dB (RF) ranges while maintaining linearity and current efficiency.

Key Specifications

Pinout & Package

MAX2361EGM is housed in a 48-pin TQFN-EP (exposed paddle) package, 7mm × 7mm × 0.8mm, with thermal pad soldered to PCB ground for enhanced power dissipation and RF isolation. Pin numbering follows standard counter-clockwise layout starting from top-left corner (Pin 1 = RFL).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quadrature transmitter applications.

Compared with MAX2363EGM and MAX2365EGM, the MAX2361EGM uniquely provides full dual-band (cellular + PCS), triple-mode (CDMA/cdma2000/FM) operation with three independent RF outputs-enabling split-band PCS filtering and eliminating external SAW filters where the alternatives require them.

Availability

MAX2361EGM is available at Aetrix Electronics and suitable for CDMA/cdma2000 mobile handsets, W-CDMA dual-mode phones, and satellite communication terminals requiring stable component supply, full production traceability, and long-term lifecycle support.

Supply support for MAX2361EGM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a leading designer of high-performance analog, mixed-signal, and RF ICs for communications, computing, consumer, and industrial applications.

The MAX2361EGM belongs to Maxim's complete quadrature transmitter product line, engineered specifically for space-constrained, multi-standard cellular handsets requiring integrated IF/RF synthesis, wide dynamic range, and minimal external components.

FAQ

What is the primary function of the MAX2361EGM in a cellular handset design?

The MAX2361EGM serves as the complete transmit signal chain IC in cellular handsets, performing baseband I/Q modulation, IF upconversion, dual-band RF upconversion (800–1000MHz and 1700–2000MHz), and driving external power amplifiers via three dedicated open-collector outputs. It integrates dual synthesizers, dual IF VCOs, and unified gain control to replace discrete modulators, filters, and drivers-reducing bill-of-materials and PCB area while maintaining CDMA/cdma2000/W-CDMA spectral compliance.

How does the MAX2361EGM achieve 100dB power-control range?

The MAX2361EGM achieves 100dB total power-control range by combining an 85dB IF VGA gain-control range (via GC pin voltage 0.6V–2.4V) with a 40dB RF VGA gain-control range, both controlled simultaneously by the same analog GC input. This unified control ensures coordinated gain scaling across the signal chain, preserving linearity and minimizing distortion while enabling precise output power ramping for standards-compliant transmission.

Can the MAX2361EGM operate without external SAW filters?

Yes-the MAX2361EGM eliminates the need for external RF SAW filters through its single-sideband upconverter architecture, which suppresses image signals to −35dBc at maximum output power. This allows direct connection of its RFL, RFH0, and RFH1 outputs to PA input matching networks, reducing component count, insertion loss, and board space versus traditional double-conversion transmitters requiring image-reject filtering.

What are the key differences between the MAX2361EGM and MAX2365EGM?

The MAX2361EGM supports dual-band (cellular + PCS) and triple-mode (CDMA/cdma2000/FM) operation with three RF outputs (RFL, RFH0, RFH1), whereas the MAX2365EGM is single-band (cellular only) and dual-mode (FM + digital), featuring only the RFL output. The MAX2361EGM includes dual IF VCOs and IF ports for split-band filtering; the MAX2365EGM omits RFH0/RFH1 and associated circuitry, making it incompatible for PCS-band applications.

What package type and thermal characteristics does the MAX2361EGM use?

The MAX2361EGM is packaged in a 48-pin TQFN-EP (7mm × 7mm × 0.8mm) with exposed thermal paddle. It is rated for −40°C to +85°C operation and features 2.1W continuous power dissipation at +70°C (derating 27mW/°C above), requiring multiple vias from the EP pad to internal ground planes for effective thermal management and RF isolation in high-power transmit applications.