Ultra-Low-Power, 7.5Msps, Dual, 8-Bit ADC


The MAX1191 is an ultra-low-power, dual, 8-bit, 7.5Msps analog-to-digital converter (ADC). The device features two fully differential wideband track-and-hold (T/H) inputs. These inputs have a 440MHz bandwidth and accept fully differential or single-ended signals. The MAX1191 delivers a typical signal-to-noise and distortion (SINAD) of 48.6dB at an input frequency of 1.875MHz and a sampling rate of 7.5Msps while consuming only 12mW. This ADC operates from a 2.7V to 3.6V analog power supply. A separate 1.8V to 3.6V supply powers the digital output driver. In addition to ultra-low operating power, the MAX1191 features three power-down modes to conserve power during idle periods. Excellent dynamic performance, ultra-low power, and small size make the MAX1191 ideal for applications in imaging, instrumentation, and digital communications.

An internal 1.024V precision bandgap reference sets the full-scale range of the ADC to ±0.512V. A flexible reference structure allows the MAX1191 to use its internal reference or accept an externally applied reference for applications requiring increased accuracy.

The MAX1191 features parallel, multiplexed, CMOS-compatible tri-state outputs. The digital output format is offset binary. A separate digital power input accepts a voltage from 1.8V to 3.6V for flexible interfacing to different logic levels. The MAX1191 is available in a 5mm x 5mm, 28-pin thin QFN package, and is specified for the extended industrial (-40°C to +85°C) temperature range.

For higher sampling frequency applications, refer to the MAX1195-MAX1198 dual 8-bit ADCs. See a parametric table of the complete family of pin-compatible, 8-bit high-speed ADCs.
MAX1191: Functional Diagram MAX1191: Functional Diagram Enlarge+

Key Features

  • Ultra-Low Power
    • 12mW (Normal Operation: 7.5Msps)
    • 0.3µW (Shutdown Mode)
  • Excellent Dynamic Performance
    • 48.7dB SNR at fIN = 1.875MHz
    • 69dBc SFDR at fIN = 1.875MHz
  • 2.7V to 3.6V Single Analog Supply
  • 1.8V to 3.6V TTL/CMOS-Compatible Digital Outputs
  • Fully Differential or Single-Ended Analog Inputs
  • Internal/External Reference Option
  • Multiplexed CMOS-Compatible Tri-State Outputs
  • 28-Pin Thin QFN Package
  • Evaluation Kit Available (Order MAX1193EVKIT)


  • Battery-Powered Portable Instruments
  • IQ Baseband Sampling
  • Low-Power Video
  • Ultrasound and Medical Imaging
  • WLAN, Mobile DSL, WLL Receiver
Part Number Input Chan. Resolution
Sample Rate
Full Pwr. BW
Data Bus Interface Budgetary
max ≥ min min See Notes
MAX1191  2 8 7.5 69 48.6 48.7 -68 0.13 0.15 440 µP/10 $3.13 @1k
See All High-Speed ADCs (> 5Msps) (73)

Part Number Input Chan. SNR
See Notes
MAX1191  2 48.7 48.6 $3.13 @1k
See All Precision ADCs (< 5Msps) (462)
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

Tutorial 2085 Histogram Testing Determines DNL and INL Errors
Tutorial 1819 Selecting the Optimum Test Tones and Test Equipment for Successful High-Speed ADC Sinewave Testing
Tutorial 1040 Coherent Sampling vs. Window Sampling

Quality and Environmental Data

Request Reliability Report for: MAX1191 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Evaluation Kit: MAX1193EVKIT

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