Analog Devices Inc./Maxim Integrated MAX1003CAX

Overview

The MAX1003CAX from Maxim Integrated is a dual, 6-bit analog-to-digital converter (ADC) designed for simultaneous I/Q baseband signal digitization in RF receiver front-ends. It delivers 90Msps sampling per channel, 5.85 ENOB at 20MHz input, and supports user-selectable 125/250/500mVp-p full-scale ranges with true differential inputs and internal bandgap reference. It operates from +5V analog and +3.3V digital supplies and targets satellite demodulation systems.

For engineers reviewing the MAX1003CAX datasheet, MAX1003CAX pinout, MAX1003CAX application, or MAX1003CAX equivalent, key selection criteria include its matched dual-channel timing (1.5ns data skew), -75dB PSRR, 55MHz (-0.5dB) analog bandwidth, ±1/4LSB INL/DNL, and SSOP-36 package compatibility with high-density RF layout requirements.

Technical Context

The MAX1003CAX implements two independent flash ADCs with 63 fully differential comparators and a proprietary encoding scheme limiting dynamic encoding error to ≤1LSB. Each channel features programmable-gain amplifiers with true differential inputs, 20kΩ internal bias resistors, and on-chip offset-correction circuitry requiring external 0.22µF compensation capacitors for AC-coupled operation.

It integrates a differential tank-based oscillator (70–110MHz) with overdrive capability for external clock injection, a buffered bandgap voltage reference, and +3.3V CMOS-compatible digital outputs with pipeline delay of one clock cycle. The separation of analog (GND) and digital (OGND) grounds and dedicated VCC/VCCO supplies enables noise isolation critical for ENOB preservation in RF sampling.

Key Specifications

Pinout & Package

MAX1003CAX is housed in a 36-pin Shrink Small Outline Package (SSOP) with exposed pad not electrically connected. Pin spacing is 0.025", body width 0.209", and total package dimensions 9.9mm × 3.9mm × 1.75mm. Thermal pad is non-functional; no solder paste required.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.

Compared with AD9222ASTZ and ADS5271IPFP, the MAX1003CAX uniquely balances 90Msps dual-channel sampling, 350mW power, and 3.3V CMOS parallel outputs-making it the only option optimized for legacy satellite receiver architectures requiring minimal board redesign and thermal budget headroom.

Availability

MAX1003CAX is available at Aetrix Electronics and suitable for Direct Broadcast Satellite (DBS) Receivers, VSAT Receivers, and Cable Television Set-Top Boxes requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for MAX1003CAX 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 semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The MAX1003CAX belongs to Maxim's high-speed data converter product line, engineered specifically for cost-sensitive, power-constrained RF receiver applications demanding precise I/Q signal fidelity and minimal external component count.

FAQ

What is the operating temperature range for the MAX1003CAX?

The MAX1003CAX is specified for commercial-grade operation from 0°C to +70°C. This range aligns with indoor satellite receiver and set-top box environments where ambient temperatures remain within controlled limits. The device's thermal design-350mW total dissipation and SSOP-36 package-ensures stable performance across this full range without derating. All DC and AC specifications in the datasheet are guaranteed within this temperature window.

Does the MAX1003CAX require external reference components?

No, the MAX1003CAX does not require external reference components. It integrates a buffered bandgap voltage reference generating a stable 2.35V internal reference that drives both ADC ladders and input amplifier bias networks. This eliminates external reference ICs, reduces PCB area, and improves temperature tracking between reference, input stage, and conversion core-directly contributing to the ±1/4LSB INL specification.

How is clocking implemented on the MAX1003CAX?

The MAX1003CAX supports two clocking modes: internal tank-based oscillation (70–110MHz) using TNK+/TNK− pins with an external LC network, or external clock overdrive (300–1250mVp-p sinusoid) injected into the same pins. The internal clock driver buffers and distributes the clock to all comparators simultaneously, minimizing skew. DCLK output provides a synchronous frame signal for latch timing with 3.6ns propagation delay.

Can the MAX1003CAX accept single-ended analog inputs?

Yes, the MAX1003CAX supports both differential and single-ended analog inputs. For single-ended use, connect the inverting input (IIN− or QIN−) to the internal 2.35V bias voltage (via 20kΩ resistor) and drive the non-inverting input (IIN+ or QIN+) with the signal source. Figures 2 and 4 in the datasheet provide validated schematics for AC- and DC-coupled single-ended configurations, preserving specified dynamic performance.

What digital interface standards does the MAX1003CAX support?

The MAX1003CAX uses a parallel CMOS-compatible digital interface with 6-bit I-channel (DI0–DI5) and 6-bit Q-channel (DQ0–DQ5) outputs, plus a frame-synchronizing DCLK signal. All outputs operate at +3.3V logic levels with 1MΩ load and 15pF max capacitance. It does not implement serial interfaces (e.g., JESD204B), SPI, or I²C-its interface is purpose-built for direct connection to 3.3V DSPs, FPGAs, or ASICs with parallel data capture capability.