Dual-Channel, 12-Bit, 275-MSPS Digital-to-Analog Converter (DAC)

The DAC5662 is a monolithic,

dual-channel 12-bit high-speed digital-to-analog converter (DAC) with on-chip

voltage reference.

Operating with update rates of up to

275 MSPS, the DAC5662 offers exceptional dynamic performance and tight-gain and

offset matching, characteristics that make it suitable in either I/Q baseband or

direct IF communication applications.

Each DAC has a high-impedance

differential current output, suitable for single-ended or differential analog-output

configurations. External resistors allow scaling the full-scale output current for

each DAC separately or together, typically between 2 mA and 20 mA. An accurate

on-chip voltage reference is temperature compensated and delivers a stable 1.2-V

reference voltage. Optionally, an external reference may be used.

The DAC5662

has two 12-bit parallel input ports with separate clocks and data latches. For

flexibility, the DAC5662 also supports multiplexed data for each DAC on one port

when operating in the interleaved mode.

The DAC5662 has been specifically

designed for a differential transformer coupled output with a 50-Ω doubly terminated

load. For a 20-mA full-scale output current a 4:1 impedance ratio (resulting in an

output power of 4 dBm) and 1:1 impedance ratio

transformer (-2 dBm output power) are supported.

The DAC5662 is available in a 48-pin

thin quad FlatPack (TQFP). Pin compatibility between family members provides 12-bit

(DAC5662) and 14-bit (DAC5672) resolution. Furthermore, the DAC5662 is pin

compatible to the DAC2902 and AD9765 dual DACs. The device is characterized for

operation over the industrial temperature range of -40°C to 85°C.