AD9957集成电路（IC）的直接数字合成（DDS）规格书PDF中文资料

AD9957属于集成电路（IC）的直接数字合成（DDS）。由亚德诺半导体技术有限公司制造生产的AD9957直接数字合成（DDS）直接数字合成 (DDS) 用于由数字信号生成不同频率的模拟波形。在必须大范围扫描的无线系统中可用于频率控制。主时钟频率有 5MHz、16MHz、16.776MHz、25MHz、50MHz、75MHz、125MHz、180MHz、200MHz、250MHz、300MHz、400MHz、500MHz、1GHz、2.5GHz 和 3GHz，分辨率为 10 b、12 b 或 14 b。

GENERAL DESCRIPTION

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 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.

FEATURES

1 GSPS internal clock speed (up to 400 MHz analog output)

Integrated 1 GSPS 14-bit DAC

250 MHz I/Q data throughput 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 TQFP_EP package

APPLICATIONS

HFC data, telephony, and video modems

Wireless base station transmission

Broadband communications transmissions

Internet telephony