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 baseband upconversion for data transmission in a wired or wireless communications system. The AD9957 is the third offering in a family of quadrature digital upconverters (QDUCs) that includes the AD9857 and AD9856. It offers performance gains in operating speed, power consumption, and spectral performance. Unlike its predecessors, it supports a 16-bit serial input mode for I/Q baseband data. The device can alternatively be programmed to operate either as a single tone, sinusoidal source or as an interpolating DAC. The 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 includes a serial port easily configured to interface to the SPORT of the Blackfin® DSP and profile pins to enable fast and easy shift keying of any signal parameter (phase, frequency, or amplitude). Applications * HFC data, telephony, and video modems * Wireless base station transmissions * Broadband communications transmissions * Internet telephony * 1 GSPS internal clock speed (up to 400 MHz analog output) * Integrated 1 GSPS 14-bit DAC * 250 MSPS input data rate * Phase noise ≤ −125 dBc/Hz (400 MHz carrier @ 1 kHz offset) * Excellent dynamic performance >80 dB narrow-band SFDR * 8 programmable profiles for shift keying * Sin(x)/(x) correction (inverse sinc filter) * Reference clock multiplier * Internal oscillator for a single crystal operation * Software and hardware controlled power-down * Integrated RAM * Phase modulation capability * Multichip synchronization * Easy interface to Blackfin SPORT * Interpolation factors from 4× to 252× * Interpolation DAC mode * Gain control DAC * Internal divider allows references up to 2 GHz * 1.8 V and 3.3 V power supplies * 100-lead TQFPEP package https://elecena.pl/product/17738994/1-gsps-quadrature-digital-upconverter-with-18-bit-i-q-data-path-and-14-bit-dac 2021-04-16 https://elecena.pl/product/17738994/1-gsps-quadrature-digital-upconverter-with-18-bit-i-q-data-path-and-14-bit-dac 2025-01-18