XRD64L44 Datasheet | Exar

FEATURES APPLICATIONS - 10-Bit Resolution - - - - - - - - - - Two Monolithic plete 10-Bit ADCs 50 MSPS Conversion Rate On-Chip Track-and-Hold On-Chip Voltage Reference Low 5 p F Input Capacitance TTL/CMOS Outputs Tri-State Output Buffers Single +3V or +5V Power Supply Operation Low Power Dissipation: 250m W-typ @ 3.0V -40°C to +85°C Operation Temperature Range - Medical Ultrasound Imaging - I & Q Modems BENEFITS - - - - Reduction of ponents Reduction of System Cost High Performance @ Low Power Dissipation Long Term Time and Temperature Stability GENERAL DESCRIPTION The XRD64L44 is two 10-bit, monolithic, 50 MSPS ADCs. Manufactured using a standard CMOS process, the XRD64L44 offers low power, low cost and excellent performance. The on-chip track-and-hold amplifier(T/H) and voltage reference (VREF) eliminate the need for external active ponents, requiring only an external ADC conversion clock for the application. The XRD64L44 analog input can be driven with ease due to the high input impedance of RIN = 25KOhms and CIN = 5p F. The design architecture uses 17 time- interleaved 10bit SAR ADCs in each converter to achieve high conversion rate of 50 MSPS minimum. In order to insure and maintain accurate 10-bit operation with respect to time and temperature, XRD64L44 incorporates an auto-calibration circuit which continuously adjusts and matches the offset and linearity of each ADC. This auto-calibration circuit is transparent to the user after the initial 3.4ms calibration (168,000 initial clock cycles). The power dissipation is only 250m W at 50 MSPS and 225m W at 40 MSPS with +3.0V power supply. The digital output data is straight binary format, and the tri-state disable function is provided for mon bus interface. The XRD64L44 internal reference provides cost savings and simplifies the design/development. The output voltage of the internal reference is set by two external resistors. The internal reference can be disabled if an external reference is used for a power...