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Description

The AD9775 is the 14-bit member of the AD977x pin compatible, high performance, programmable 2×/4×/8× interpolating TxDAC+ family. The AD977x family features a serial port interface (SPI) that provides a high level of programmability, thus allowing for enhanced system-level options. These options include selectable 2×/4×/8× interpolation filters; fS/2, fS/4, or fS/8 digital quadrature modulation with image rejection; a direct IF mode; programmable channel gain and offset control; programmable internal clock divider; straight binary or twos complement data
interface; and a single-port or dual-port data interface. The selectable 2×/4×/8× interpolation filters simplify the requirements of the reconstruction filters while simultaneously enhancing the pass-band noise/distortion performance of TxDAC+ devices. The independent channel gain and offset adjust registers allow the user to calibrate LO feedthrough and sideband suppression errors associated with analog quadrature modulators. The 6 dB of gain adjustment range can also be used to control the output power level of each DAC.

Features

1. 14-bit resolution, 160 MSPS/400 MSPS input/output data rate
2. Selectable 2×/4×/8× interpolating filter
3. Programmable channel gain and offset adjustment
4. fS/4, fS/8 digital quadrature modulation capability
5. Direct IF transmission mode for 70 MHz + IFs
6. Enables image rejection architecture
7. Fully compatible SPI® port
8. Excellent ac performance
9. Internal PLL clock multiplier
10. Selectable internal clock divider
11. Twos complement/straight binary data coding
12. Dual-port or single-port interleaved input data
13. Single 3.3 V supply operation

Applications :

1. Communications
2. Analog quadrature modulation architecture
3. 3G, multicarrier GSM, TDMA, CDMA systems
4. Broadband wireless, point-to-point microwave radios
5. Instrumentation/ATE