1.8V, 8-Bit, 250Msps Analog-to-Digital Converter with LVDS Outputs for Wideband Applications

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The MAX1121 is a monolithic 8-bit, 250Msps analog-to-digital converter (ADC) optimized for outstanding dynamic performance at high IF frequencies up to 500MHz. The product operates with conversion rates of up to 250Msps while consuming only 477mW.

At 250Msps and an input frequency of 100MHz, the MAX1121 achieves a spurious-free dynamic range (SFDR) of 68dBc. Its excellent signal-to-noise ratio (SNR) of 48.9dB at 10MHz remains flat (within 0.5dB) for input tones up to 500MHz. This makes the MAX1121 ideal for wideband applications such as digital predistortion in cellular base-station transceiver systems.

The MAX1121 requires a single 1.8V supply. The analog input is designed for either differential or single-ended operation and can be AC- or DC-coupled. The ADC also features a selectable on-chip divide-by-2 clock circuit, which allows the user to apply clock frequencies as high as 500MHz. This helps to reduce the phase noise of the input clock source. A differential LVDS sampling clock is recommended for best performance. The converter's digital outputs are LVDS compatible, and the data format can be selected to be either two's complement or offset binary.

The MAX1121 is available in a 68-pin QFN with exposed pad (EP) and is specified over the industrial (-40°C to +85°C) temperature range.

For pin-compatible, higher resolution versions of the MAX1121, refer to the MAX1122 (170Msps), the MAX1123 (210Msps), and the MAX1124 (250Msps) data sheets.
MAX1121: Block Diagram MAX1121: Block Diagram Enlarge+

Key Features

  • 250Msps Conversion Rate
  • SNR = 48.8dB/48.7dB at fIN = 100MHz/500MHz
  • SFDR = 68dBc/63.8dBc at fIN = 100MHz/500MHz
  • Single 1.8V Supply
  • 477mW Power Dissipation at 250Msps
  • On-Chip Track-and-Hold and Internal Reference
  • On-Chip Selectable Divide-by-2 Clock Input
  • LVDS Digital Outputs with Data Clock Output
  • Evaluation Kit Available (Order MAX1124EVKIT)


  • Communications Test Equipment
  • Digital Oscilloscopes
  • Digital Predistortion Receivers
  • Instrumentation
  • Radar and Satellite Subsystems Antenna Array Processing
  • Wireless and Wired Broadband Communication

MAX1124EVKIT: Evaluation Kit for the MAX1121, MAX1122, MAX1123, and MAX1124
Request Reliability Report for: MAX1121 
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Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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