MAX1185
Dual 10-Bit, 20Msps, +3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs
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Overview
Features and Benefits
- Single +3V Operation
- Excellent Dynamic Performance:
- 59.5dB SNR at fIN = 7.5MHz
- 74dB SFDR at fIN = 7.5MHz
- Low Power:
- 35mA (Normal Operation)
- 2.8mA (Sleep Mode)
- 1µA (Shutdown Mode)
- 0.02dB Gain and 0.25° Phase Matching
- Wide ±1VP-P Differential Analog Input Voltage Range
- 400MHz, -3dB Input Bandwidth
- On-Chip +2.048V Precision Bandgap Reference
- Single 10-Bit Bus for Multiplexed, Digital Outputs
- User-Selectable Output Format—Two's Complement or Offset Binary
- 48-Pin TQFP Package with Exposed Pad for Improved Thermal Dissipation
Product Details
The MAX1185 is a 3V, dual 10-bit analog-to-digital converter (ADC) featuring fully-differential wideband track-and-hold (T/H) inputs, driving two pipelined, nine-stage ADCs. The MAX1185 is optimized for low-power, high dynamic performance applications in imaging, instrumentation, and digital communication applications. This ADC operates from a single 2.7V to 3.6V supply, consuming only 105mW while delivering a typical signal-to-noise ratio (SNR) of 59.5dB at an input frequency of 7.5MHz and a sampling rate of 20Msps. Digital outputs A and B are updated alternating on the rising (CHA) and falling (CHB) edge of the clock. The T/H driven input stages incorporate 400MHz (-3dB) input amplifiers. The converters may also be operated with single-ended inputs. In addition to low operating power, the MAX1185 features a 2.8mA sleep mode as well as a 1µA power-down mode to conserve power during idle periods.
An internal 2.048V precision bandgap reference sets the full-scale range of the ADC. A flexible reference structure allows the use of this internal or an externally derived reference, if desired for applications requiring increased accuracy or a different input voltage range. The MAX1185 features parallel, multiplexed, CMOS-compatible three-state outputs. The digital output format can be set to two's complement or straight offset binary through a single control pin. The device provides for a separate output power supply of 1.7V to 3.6V for flexible interfacing. The MAX1185 is available in a 7mm x 7mm, 48-pin TQFP package, and is specified for the extended industrial (-40°C to +85°C) temperature range.
Pin-compatible, nonmultiplexed. high-speed versions of the MAX1185 are also available. Refer to the MAX1180 data sheet for 105Msps, the MAX1181 data sheet for 80Msps, the MAX1182 data sheet for 65Msps, the MAX1183 data sheet for 40Msps, and the MAX1184 data sheet for 20Msps.
Applications
- High-Resolution Imaging
- I/Q Channel Digitization
- Instrumentation
- Multichannel IF Sampling
- Ultrasound
- Video Application
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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MAX1185 Reliability Data1/12/2023PDF95K
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High-Speed ADC Sets Input Common-Mode Range12/29/2003
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Selecting the Optimum Test Tones and Test Equipment for Successful High-Speed ADC Sinewave Testing12/18/2002
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Dynamic Testing of High-Speed ADCs, Part 27/22/2002
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Reference Voltage for Multiple ADCs7/4/2002
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Coherent Sampling vs. Window Sampling3/29/2002
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Defining and Testing Dynamic Parameters in High-Speed ADCs, Part 111/19/2001
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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