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12-Bit, 20Msps, +3.3V, Low-Power ADC with Internal Reference

Product Details

Key Features

Parametric specs for High-Speed ADCs (> 5Msps)
Resolution (bits) 12
# Input Channels 1
Sample Rate (Msps) (max) 20
Data Bus Interface µP/12
AC Specs (MHz) (@ fIN) 15
SFDR (dBc) (min) 74
ENOB (bits) (min) 10.5
SINAD (dB) 65
SNR (dB) 67
THD (dB) -72
DNL (±LSB) 1
INL (±LSB) 2
Package/Pins LQFP/48
Budgetary
Price (See Notes)
8.71
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Simplified Block Diagram

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Parameters

Parametric specs for High-Speed ADCs (> 5Msps)
Resolution (bits) 12
# Input Channels 1
Sample Rate (Msps) (max) 20
Data Bus Interface µP/12
AC Specs (MHz) (@ fIN) 15
SFDR (dBc) (min) 74
ENOB (bits) (min) 10.5
SINAD (dB) 65
SNR (dB) 67
THD (dB) -72
DNL (±LSB) 1
INL (±LSB) 2
Package/Pins LQFP/48
Budgetary
Price (See Notes)
8.71

Key Features

  • Single 3.3V Power Supply
  • 67dB SNR at fIN = 5MHz
  • Internal 2.048V Precision Bandgap Reference
  • Differential Wideband Input T/H Amplifier
  • Power-Down Modes
    • 130mW (Reference Shutdown Mode)
    • 10µW (Shutdown Mode)
  • Space-Saving 48-Pin TQFP Package

Applications/Uses

  • CCD Pixel Processing
  • Data Acquisition
  • IF and Baseband Digitization
  • Medical Ultrasound Imaging
  • Radar

Description

The MAX1422 3.3V, 12-bit analog-to-digital converter (ADC) features a fully differential input, pipelined, 12- stage ADC architecture with wideband track-and-hold (T/H) and digital error correction incorporating a fully-differential signal path. The MAX1422 is optimized for lowpower, high dynamic performance applications in imaging and digital communications. The converter operates from a single 3.3V supply, consuming only 137mW while delivering a 67dB (typ) signal-to-noise ratio (SNR) at a 5MHz input frequency and a 20Msps sampling frequency. The fully-differential input stage has a small signal -3dB bandwidth of 400MHz and may be operated with single-ended inputs.

An internal 2.048V precision bandgap reference sets the ADCs full-scale range. A flexible reference structure accommodates an internally or externally applied buffered or unbuffered reference for applications requiring increased accuracy or a different input voltage range.

In addition to low operating power, the MAX1422 features two power-down modes, a reference power-down, and a shutdown mode. In reference power-down, the internal bandgap reference is deactivated, resulting in a 2mA (typ) supply current reduction. For idle periods, a full shutdown mode is available to maximize power savings.

The MAX1422 provides parallel, offset binary, CMOS-compatible three-state outputs.

The MAX1422 is available in a 7mm x 7mm x 1.4mm, 48-pin TQFP package and is specified over the commercial (0°C to +70°C) and extended industrial (-40°C to +85°C) temperature ranges.

Pin-compatible higher-speed versions of the MAX1422 are also available. Please refer to the MAX1421 data sheet for 40Msps and the MAX1420 data sheet for 60Msps.

Simplified Block Diagram

MAX1422: Functional Diagram MAX1422: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.