Features

• Sample Rate: 170Msps/135Msps
• 67.5dB SNR up to 140MHz Input
• 80dB SFDR up to 170MHz Input
• 775MHz Full Power Bandwidth S/H
• Single 3.3V Supply
• Low Power Dissipation: 890mW/660mW
• LVDS, CMOS, or Demultiplexed CMOS Outputs
• Selectable Input Ranges: ±0.5V or ±1V
• No Missing Codes
• Optional Clock Duty Cycle Stabilizer
• Shutdown and Nap Modes
• Data Ready Output Clock
• Pin Compatible Family
  185Msps: LTC2220-1 (12-Bit)
  170Msps: LTC2220 (12-Bit), LTC2230 (10-Bit)
  135Msps: LTC2221 (12-Bit), LTC2231 (10-Bit)
• 64-Pin 9mm × 9mm QFN Package

Typical Application

Description

The LTC2220 and LTC2221 are 170Msps/135Msps, sampling 12-bit A/D converters designed for digitizing high frequency, wide dynamic range signals. The LTC2220/LTC2221 are perfect for demanding communications applications with AC performance that includes 67.5dB SNR and 80dB spurious free dynamic range for signals up to 170MHz. Ultralow jitter of 0.15ps_RMS allows undersampling of IF frequencies with excellent noise performance.

DC specs include ±0.4LSB INL (typ), ±0.3LSB DNL (typ) and no missing codes over temperature. The transition noise is a low 0.5LSB_RMS.

The digital outputs can be either differential LVDS, or single-ended CMOS. There are three format options for the CMOS outputs: a single bus running at the full data rate or two demultiplexed buses running at half data rate with either interleaved or simultaneous update. A separate output power supply allows the CMOS output swing to range from 0.5V to 3.6V.

The ENC⁺ and ENC^– inputs may be driven differentially or single ended with a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed for a wide range of clock duty cycles.