MAXIM MAX1185ECM+TD

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 × 7mm, 48-pin TQFP package, and is specified for the extended industrial (-40°C to +85°C) temperature range.

• Single 3V Operation
• Excellent Dynamic Performance: 59.5dB SNR at fIN = 7.5 MHz, 74dB SFDR at fIN = 7.5 MHz
• 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

• High Resolution Imaging
• I/Q Channel Digitization
• Multichannel IF Sampling
• Instrumentation
• Video Application
• Ultrasound