10-Bit, 20Msps ADC

Low-Power, Low-Distortion 10-Bit ADCs Deliver 61dB SNR

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The MAX1425 10-bit, monolithic analog-to-digital converter (ADC) is capable of a 20Msps sampling rate. This device features an internal track-and-hold (T/H) amplifier for excellent dynamic performance; at the same time, it minimizes the number of external components. Low input capacitance of only 8pF minimizes input drive requirements. A wide input bandwidth (up to 150MHz) makes this device suitable for digital RF/IF downconverter applications employing undersampling techniques.

The MAX1425 employs a differential pipelined architecture with a wideband T/H amplifier to maximize throughput while limiting power consumption to only 172mW. The MAX1425 generates an internal +2.5V reference that supplies three additional reference voltages (+3.25V, +2.25V, and +1.25V). These reference voltages provide a differential input range of +2V to -2V. The analog inputs are biased internally to correct the DC level, eliminating the need for external biasing on AC-coupled applications.

A separate +3V digital logic supply input allows for separation of digital and analog circuitry. The output data is in two's complement format. The MAX1425 is available in the space-saving 28-pin SSOP package. For a pin-compatible version at a lower data rate, refer to the MAX1426 data sheet. For a higher data rate, refer to the MAX1424 data sheet.
MAX1425: Functional Diagram MAX1425: Functional Diagram Enlarge+

Key Features

  • Differential Inputs for High Common-Mode Noise Rejection
  • Signal-to-Noise Ratio
    • 61dB (at fIN = 2MHz)
    • 59.3dB (at fIN = 10MHz)
  • Internal +2.5V Reference
  • 150MHz Input Bandwidth
  • Wide ±2V Input Range
  • Low Power Consumption: 172mW
  • Separate Digital Supply Input for 3V Logic Compatibility
  • Single +5V Supply Operation Possible


  • CCD Pixel Processing
  • IF and Baseband Digitization
  • IR Focal Plane Arrays
  • Medical Ultrasound Imaging
  • Radar
  • Set-Top Boxes

See parametric specs for High-Speed ADCs (> 5Msps) (49)

Part NumberInput ChannelsResolution
Sample Rate
Full Pwr. BW
Data Bus InterfacePackage/PinsBudgetary
maxminminmintypSee Notes
MAX1425 11020699.55959-6911.540031.5µP/10
$5.29 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 3292 Crunching FFTs with Microsoft Excel
Tutorial 1023 Understanding Pipelined ADCs
Request Reliability Report for: MAX1425 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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