AD9957

The AD9957 functions as a universal I/Q modulator and agile upconverter for communications systems where cost, size, power consumption and dynamic performance are critical. The AD9957 integrates a high speed Direct Digital Synthesizer (DDS), a high performance, high speed 14-bit digital to analog converter (DAC), clock multiplier circuitry, digital filters and other DSP functions onto a single chip. It provides for base band up-conversion for data transmission in a wired or wireless communications system.

The AD9957 is the third offering in a family of a quadrature digital upconverters (QDUCs), which includes the AD9857 and AD9856. It offers performance gains in operating speed, power consumption and spectral performance. Unlike its predecessors, it also supports a 16-bit serial input mode for I/Q base band data. The device can alternatively be programmed to operate as a single-tone sinusoidal source or as an interpolating DAC.

The AD9957 Reference Clock input circuitry includes a crystal oscillator, a high speed divide-by-two input, and a low noise PLL for multiplication of the reference clock frequency.

The user interface to the control functions pf AD9957 includes a serial port easily configured to interface to the SPORT of the Blackfin DSP and profile pins which enable fast and easy shift keying of any signal parameter (phase, frequency, and amplitude).