General Description

The MAX1003 is a dual, 6-bit analog-to-digital converter (ADC) that combines high-speed, low-power operation with a user-selectable input range, an internal reference, and a clock oscillator. The dual parallel ADCs are designed to convert in-phase (I) and quadrature (Q) analog signals into two 6-bit, offset-binary-coded digital outputs at sampling rates up to 90Msps. The ability to directly interface with baseband I and Q signals makes the MAX1003 ideal for use in direct-broadcast satellite, VSAT, and QAM16 demodulation applications.

Features

♦ Two Matched 6-Bit ADCs

♦ High Sampling Rate: 90Msps per ADC

♦ Low Power Dissipation: 350mW

♦ Excellent Dynamic Performance:

5.85 ENOB with 20MHz Analog Input

5.7 ENOB with 50MHz Analog Input

♦ ±1/4LSB INL and DNL (typ)

♦ Internal Bandgap Voltage Reference

♦ Internal Oscillator with Overdrive Capability

♦ 55MHz (-0.5dB) Bandwidth Input Amplifiers with

True Differential Inputs

♦ User-Selectable Input Full-Scale Range

(125mVp-p, 250mVp-p, or 500mVp-p)

♦ 1/4LSB Channel-to-Channel Offset Matching (typ)

♦ 0.1dB Gain and 0.5° Phase Matching (typ)

♦ Single-Ended or Differential Input Drive

♦ Flexible, 3.3V, CMOS-Compatible Digital Outputs

Applications

Direct Broadcast Satellite (DBS) Receivers

VSAT Receivers

Wide Local Area Networks (WLANs)

Cable Television Set-Top Boxes