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The LTC®1666/LTC1667/LTC1668 are 12-/14-/16-bit,50Msps differential current output DACs implemented on a high performance BiCMOS process with laser trimmed,thin-film resistors. The combination of a novel currentsteering architecture and a high performance process produces DACs with exceptional AC and DC performance.The LTC1668 is the first 16-bit DAC in the marketplace to exhibit an SFDR (spurious free dynamic range) of 87dB for an output signal frequency of 1MHz.
Operating from ±5V supplies, the LTC1666/LTC1667/LTC1668 can be configured to provide full-scale output currents up to 10mA. The differential current outputs of the DACs allow single-ended or true differential operation.The 1V to 1V output compliance of the LTC1666/LTC1667/LTC1668 allows the outputs to be connected directly to external resistors to produce a differential output voltage without degrading the converter's linearity. Alternatively,the outputs can be connected to the summing junction of a high speed operational amplifier, or to a transformer.
The LTC1666/LTC1667/LTC1668 are pin compatible and are available in a 28-pin SSOP and are fully specified over the industrial temperature range.
LTC1666 Maximum Ratings
Supply Voltage (VDD) ............................................... 6V Negative Supply Voltage (VSS) .............................. 6V Total Supply Voltage (VDD to VSS) .......................... 12V Digital Input Voltage ...................0.3V to (VDD + 0.3V) Analog Output Voltage (IOUT A and IOUT B) ....... (VSS 0.3V) to (VDD + 0.3V) Power Dissipation ............................................. 500mW Operating Temperature Range LTC1666C/LTC1667C/LTC1668C ........... 0°C to 70°C LTC1666I/LTC1667I/LTC1668I .......... 40°C to 85°C Storage Temperature Range ............. 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C
LTC1666 Features
· 50Msps Update Rate · Pin Compatible 12-Bit, 14-Bit and 16-Bit Devices · High Spectral Purity: 87dB SFDR at 1MHz fOUT · 5pV-s Glitch Impulse · Differential Current Outputs · 20ns Settling Time · Low Power: 180mW from ±5V Supplies · TTL/CMOS (3.3V or 5V) Inputs · Small Package: 28-Pin SSOP
LTC1666 Typical Application
· Cellular Base Stations · Multicarrier Base Stations · Wireless Communication · Direct Digital Synthesis (DDS) · xDSL Modems · Arbitrary Waveform Generation · Automated Test Equipment · Instrumentation