5 Description (continued)

LVDS is typically implemented in low-voltage digital CMOS processes, making it the ideal technology for high-speed interfacing between the DAC5675A-SP and high-speed low-voltage CMOS ASICs or FPGAs.

The DAC5675A-SP current-source-array architecture supports update rates of up to 400 MSPS. On-chip edge-triggered input latches provide for minimum setup and hold times, thereby relaxing interface timing.

The DAC5675A-SP is specifically designed for a differential transformer-coupled output with a 50-Ω doubly-terminated load. With the 20-mA full-scale output current, both a 4:1 impedance ratio (resulting in an output power of 4 dBm) and 1:1 impedance ratio transformer (–2 dBm) is supported. The last configuration is preferred for optimum performance at high output frequencies and update rates. The outputs are terminated to AVDD and have voltage compliance ranges from AV_DD – 1 to AV_DD + 0.3 V.

An accurate on-chip 1.2-V temperature-compensated bandgap reference and control amplifier allows the user to adjust this output current from 20 to 2 mA. This provides 20-dB gain range control capabilities. Alternatively, an external reference voltage may be applied. The DAC5675A-SP features a SLEEP mode, which reduces the standby power to approximately 18 mW.

The DAC5675A-SP is available in a 52-pin ceramic nonconductive tie-bar package (HFG). The device is specified for operation over the military temperature range of –55°C to 125°C and W temperature range of –55°C to 115°C.