500ksps, Sampling, 12-Bit ADC with Track/Hold and Reference

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The MAX120/MAX122 complete, BiCMOS, sampling 12-bit analog-to-digital converters (ADCs) combine an on-chip track/hold (T/H) and a low-drift voltage reference with fast conversion speeds and low-power consumption. The T/H’s 350ns acquisition time combined with the MAX120’s 1.6µs conversion time results in throughput rates as high as 500k samples per second (ksps). Throughput rates of 333ksps are possible with the 2.6μs conversion time of the MAX122.

The MAX120/MAX122 accept analog input voltages from -5V to +5V. The only external components needed are decoupling capacitors for the power-supply and reference voltages. The MAX120 operates with clocks in the 0.1MHz to 8MHz frequency range. The MAX122 accepts 0.1MHz to 5MHz clock frequencies.

The MAX120/MAX122 employ a standard microprocessor (µP) interface. Three-state data outputs are configured to operate with 12-bit data buses. Data-access and bus-release timing specifications are compatible with most popular µPs without resorting to wait states. In addition, the MAX120/MAX122 can interface directly to a first-in, first-out (FIFO) buffer, virtually eliminating µP interrupt overhead. All logic inputs and outputs are TTL/CMOS compatible. For applications requiring a serial interface, refer to the MAX121.

MAX120, MAX122: Functional Diagram MAX120, MAX122: Functional Diagram Enlarge+

Key Features

  • 12-Bit Resolution
  • No Missing Codes Over Temperature
  • 20ppm/°C -5V Internal Reference
  • 1.6µs Conversion Time/500ksps Throughput (MAX120)
  • 2.6µs Conversion Time/333ksps Throughput (MAX122)
  • Low Noise and Distortion:
    • 70dB Minimum SINAD;
    • -70dB Max THD (MAX122)
  • Low Power Dissipation: 210mW
  • Separate Track/Hold Control Input
  • Continuous-Conversion Mode Available
  • ±5V Input Range, Overvoltage Tolerant to ±15V
  • 24-Pin Narrow DIP, Wide SO and SSOP Packages
Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
Bipolar VIN
ADCmaxnominalmaxSee Notes
MAX120 121500SARµP/12S.E. Only5572-821
SOIC (W)/24
$22.21 @1k
MAX122 33370-85
SOIC (W)/24
$19.66 @1k
See All Precision ADCs (< 5Msps) (443)
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.

Quality and Environmental Data

Product Reliability Reports: MAX120.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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.

Quality Management System >
Environmental Management System >


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