Dual 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs

The MAX1196 is a 3V, dual 8-bit analog-to-digital converter (ADC) featuring fully differential wideband track-and-hold (T/H) inputs, driving two ADCs. The MAX1196 is optimized for low power, small size, and high-dynamic performance for applications in imaging, instrumentation, and digital communications. This ADC operates from a single 2.7V to 3.6V supply, consuming only 87mW while delivering a typical signal-to-noise and distortion (SINAD) of 48.4dB at an input frequency of 20MHz and a sampling rate of 40Msps. The T/H driven input stages incorporate 400MHz (-3dB) input amplifiers. The converters can also be operated with single-ended inputs. In addition to low operating power, the MAX1196 features a 3mA sleep mode as well as a 0.1µA 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 applied reference, if desired for applications requiring increased accuracy or a different input voltage range.

The MAX1196 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 MAX1196 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.

For a 10-bit, pin-compatible upgrade, refer to the MAX1186 data sheet. With the N.C. pins of the MAX1196 internally pulled down to ground, this ADC becomes a drop-in replacement for the MAX1186.

Applications

* Baseband I/Q Sampling

* Battery-Powered Instrumentation

* Multichannel IF Sampling

* Set-Top Boxes

* Ultrasound and Medical Imaging

* VSAT Terminals

* WLAN, WWAN, WLL, MMDS Modems

* Single 2.7V to 3.6V Operation

* Excellent Dynamic Performance

* 48.4dB/44.7dB SINAD at fIN = 20MHz/200MHz

* 68.9dB/53dBc SFDR at fIN = 20MHz/200MHz

* -72dB Interchannel Crosstalk at fIN = 20MHz

* Low Power

* 87mW (Normal Operation)

* 9mW (Sleep Mode)

* 0.3µW (Shutdown Mode)

* 0.05dB Gain and ±0.05° Phase Matching

* Wide ±1VP-P Differential Analog Input Voltage Range

* 400MHz -3dB Input Bandwidth

* On-Chip 2.048V Precision Bandgap Reference

* User-Selectable Output Format—Two's Complement or Offset Binary

* Pin-Compatible 8-Bit and 10-Bit Upgrades Available