Analog Devices Inc./Maxim Integrated MAX1003CAX+T

Overview

MAX1003CAX+T from Maxim Integrated is a dual, 6-bit, 90Msps analog-to-digital converter optimized for I/Q baseband sampling in satellite and broadband demodulation systems. It integrates matched input amplifiers with 55MHz (-0.5dB) bandwidth, internal bandgap reference, on-chip oscillator, and CMOS-compatible 3.3V digital outputs. Designed for direct interface to DBS, VSAT, and QAM16 receivers, it delivers 5.85 ENOB at 20MHz input and operates from +5V analog and +3.3V digital supplies.

For engineers reviewing the MAX1003CAX+T datasheet, MAX1003CAX+T pinout, MAX1003CAX+T application, or MAX1003CAX+T equivalent, key selection criteria include channel matching (0.1dB gain, 0.5° phase), user-selectable full-scale ranges (125/250/500mVp-p), pipeline delay of 1 clock cycle, and SSOP-36 package compatibility with high-density RF layout requirements.

Technical Context

The MAX1003CAX+T implements two independent flash ADC cores, each using 63 fully differential comparators and a proprietary encoding scheme limiting dynamic encoding error to ≤1LSB. Its I/Q signal path isolation achieves -55dB crosstalk, while on-chip offset correction-enabled via external 0.22µF compensation capacitors on IOCC+/IOCC− and QOCC+/QOCC−-nulls DC offset to ±0.5LSB in AC-coupled mode.

Timing is synchronized by either an internal differential tank oscillator (70–110MHz) or external overdrive clock (300mVp-p to 1.25Vp-p); DCLK output provides 3.6ns clock-to-data propagation delay with 1.5ns inter-channel skew. The device uses offset-binary coding (1LSB = FSR/63) and supports both single-ended and true differential analog inputs within 1.75V–2.75V common-mode range.

Key Specifications

Pinout & Package

MAX1003CAX+T is housed in a 36-pin SSOP (Shrink Small Outline Package) with 0.025" lead pitch, optimized for RF layout isolation and thermal dissipation in space-constrained satellite receiver front-ends.

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 ADS5272IPFP, the MAX1003CAX+T offers superior integration for cost-sensitive, space-constrained satellite receivers - combining matched I/Q amplifiers, selectable full-scale range, internal oscillator, and parallel CMOS outputs in a single SSOP-36 package without requiring external support components.

Availability

MAX1003CAX+T is available at Aetrix Electronics and suitable for Direct Broadcast Satellite (DBS) receivers, VSAT terminals, and cable television set-top boxes requiring stable component supply across extended production lifecycles.

Supply support for MAX1003CAX+T 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 precision analog, mixed-signal, and high-frequency ICs for communications, computing, and industrial applications.

The MAX1003CAX+T belongs to Maxim's high-speed data converter product line, designed specifically for I/Q sampling in satellite, broadband, and wireless infrastructure equipment where channel matching, low power, and integration reduce system-level design complexity.

FAQ

What is the operating temperature range for the MAX1003CAX+T?

The MAX1003CAX+T is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with indoor satellite receiver and set-top box environments. The device's internal bandgap reference and matched amplifier topology ensure stable INL, DNL, and ENOB performance across this full range without recalibration.

Does the MAX1003CAX+T require external passive components for basic operation?

Yes, the MAX1003CAX+T requires external components for reliable operation: four 0.01µF ceramic capacitors for VCC bypassing (pins 6,8,13,36), two 47pF capacitors for VCCO (pins 26,28), and 0.22µF capacitors on IOCC+/IOCC− and QOCC+/QOCC− for AC-coupled offset correction. A tank network (inductor + varactor) is needed only if using the internal oscillator mode.

Can the MAX1003CAX+T accept single-ended analog inputs?

Yes, the MAX1003CAX+T supports both single-ended and true differential analog inputs. For single-ended use, connect the inverting input (e.g., IIN−) to the internal 2.35V bias voltage (available at IOCC+ with appropriate decoupling) or to a matched external reference. The input resistance is 20kΩ and common-mode range is 1.75V–2.75V, accommodating standard op-amp driver outputs.

What is the function of the GAIN pin on the MAX1003CAX+T?

The GAIN pin on the MAX1003CAX+T selects the full-scale input range for both I and Q input amplifiers: grounded for 125mVp-p (low gain), left open for 250mVp-p (mid gain), or tied to VCC for 500mVp-p (high gain). This configuration is latched at power-up and remains static during operation, allowing hardware-level range optimization for specific LNB or IF signal levels.

How does the MAX1003CAX+T handle clock synchronization between its two ADC channels?

Both ADC channels in the MAX1003CAX+T share a single clock source - either from the internal tank oscillator or external overdrive signal applied to TNK+/TNK−. This guarantees inherent synchronization, with measured data valid skew of only 1.5ns between DIx and DQx outputs. The DCLK output provides a clean, buffered version of the internal sampling clock for downstream timing capture.