MAX1421:12-Bit, 40Msps, 3.3V, Low-Power ADC with Internal Reference

The MAX1421 is a 3.3V, 12-bit analog-to-digital converter (ADC), featuring 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 MAX1421 is optimized for low-power, high-dynamic performance applications in imaging and digital communications. The converter operates from a single 3.3V supply, consuming only 188mW while delivering a typical signal-to-noise ratio (SNR) of 66dB at an input frequency of 15MHz and a sampling frequency of 40Msps. 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 full-scale range of the ADC. A flexible reference structure accommodates an internal 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 MAX1421 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 typical 2mA supply current reduction. For idle periods, a full shutdown mode is available to maximize power savings. The MAX1421 provides parallel, offset binary, CMOS-compatible three-state outputs. The MAX1421 is available in a 7mm x 7mm, 48-pin TQFP package, and is specified over the commercial (0°C to +70°C) and the extended industrial (-40°C to +85°C) temperature ranges. Pin-compatible higher- and lower-speed versions of the MAX1421 are also available. Please refer to the MAX1420 data sheet for a frequency of 60Msps and the MAX1422 data sheet for a frequency of 20Msps.

Key Features
  • Single 3.3V Power Supply
  • 67dB SNR at fIN = 5MHz
  • 66dB SNR at fIN = 15MHz
  • Internal, 2.048V Precision Bandgap Reference
  • Differential, Wideband Input T/H Amplifier
  • Power-Down Modes
    • 180mW (Reference Shutdown Mode)
    • 10µW (Shutdown Mode)
  • Space-Saving 48-Pin TQFP Package
MAX1421: Functional Diagram
MAX1421: Functional Diagram
Applications/Uses
  • CCD Pixel Processing
  • Data Acquisition
  • IF and Baseband Digitization
  • Medical Ultrasound Imaging
  • Radar
DataSheet
titleDownload file
MAX1421 Data SheetMAX1421.pdf
Parametrics
Part NumberInput Chan.Resolution
(bits)
Sample Rate
(Msps)
AC Specs
(MHz)
SFDR
(dBc)
ENOB
(bits)
SINAD
(dB)
SNR
(dB)
THD
(dB)
DNL
(±LSB)
INL
(±LSB)
Full Pwr. BW
(MHz)
ICC
(mA)
Data Bus InterfacePackage/PinsBudgetary
Price
max ≥@ fINminminmintypSee Notes
MAX142111240157010.363.566-691215057.5µP/12LQFP/48$6.94 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1421CCM+DNo Longer AvailableLQFP;48 pin-40°C to +85°CSee data sheet
MAX1421CCM+TDNo Longer AvailableLQFP;-40°C to +85°CSee data sheet
MAX1421CCM-DNo Longer AvailableLQFP;-40°C to +85°CSee data sheet
MAX1421CCM-TDNo Longer AvailableLQFP;-40°C to +85°CSee data sheet
MAX1421ECM+DActiveLQFP,;48 pin;82.8 mm²-40°C to +85°CLead Free
MAX1421ECM+TDActiveLQFP,;48 pin;82.8 mm²-40°C to +85°CLead Free
MAX1421ECM-DNo Longer AvailableMAX1421ECM+LQFP,;48 pin;82.8 mm²-40°C to +85°CNo
MAX1421ECM-TDNo Longer AvailableMAX1421ECM+LQFP;48 pin-40°C to +85°CSee data sheet
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