AD9957 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit 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

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
Features and Benefits
  • 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
  • Multichip synchronization
  • See data sheet for additional features
RF & Microwave
AD9957 IBIS Model
Data Sheets
Documentnote
AD9957: 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC Data Sheet (Rev. D)PDF 1212 kB
Application Notes
Documentnote
AN-0996: The Advantages of Using a Quadrature Digital Upconverter (QDUC) in Point-to-Point Microwave Transmit Systems (Rev. 0)PDF 219 kB
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0)PDF 313 kB
AN-924: Digital Quadrature Modulator Gain (Rev. A)PDF 105 kB
AN-922: Digital Pulse-Shaping Filter Basics (Rev. 0)PDF 1582 kB
User Guides
Documentnote
UG-208: Evaluation Board User Guide for AD9957PDF 1296 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD9957BSVZ Production100 ld TQFP w/ 5mm exposed padOTH 90-40 to 85C2521.25Y
AD9957BSVZ-REEL Production100 ld TQFP w/ 5mm exposed padREEL 1000-40 to 85C021.25Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
AD9957/PCBZEvaluation Board400Y
AD9957:内置18位I/Q数据路径和14位DAC的1GSPS正交数字上变频器 数据手册 (Rev. A) ad9957
AD9957: 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC Data Sheet (Rev. D) ad9957
AD9957 ad9957
AD9957参考代码 ad9957
AN-0996: The Advantages of Using a Quadrature Digital Upconverter (QDUC) in Point-to-Point Microwave Transmit Systems (Rev. 0) ad9857
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0) ad9856
AN-924: Digital Quadrature Modulator Gain (Rev. A) ad9856
AN-924: 数字正交调制器增益 (Rev. A) ad9856
AN-0996: 在点对点微波发射系统中使用正交数字上变频器(QDUC)的优势 (Rev. 0) ad9857
AN-922: 数字脉冲整形滤波器基础知识 (Rev. 0) ad9856
AN-922: Digital Pulse-Shaping Filter Basics (Rev. 0) ad9856
AN-837: 基于DDS的时钟抖动性能与DAC重构滤波器性能的关系[中文版] (Rev. 0) ad9540
UG-208: Evaluation Board User Guide for AD9957 ad9957