Dual-Channel, 10-Bit, 275-MSPS Digital-to-Analog Converter (DAC)

The DAC5652 is a monolithic,

dual-channel, 10-bit, high-speed DAC with on-chip voltage reference.

Operating with update rates of up to

275 MSPS, the DAC5652 offers exceptional dynamic performance, 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 of 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 DAC5652 has two, 10-bit, parallel

input ports with separate clocks and data latches. For flexibility, the DAC5652 also

supports multiplexed data for each DAC on one port when operating in the interleaved

mode.

The DAC5652 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, both 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 DAC5652 is available in a 48-pin

TQFP package. Pin compatibility between family members provides 10-bit (DAC5652),

12-bit (DAC5662), and 14-bit (DAC5672) resolution. Furthermore, the DAC5652 is pin

compatible to the DAC2900 and AD9763 dual DACs. The device is characterized for

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