1 GSPS Quadrature Digital Upconverter with 18 Bit IQ Data Path and 14-Bit DAC AD9957BSVZ

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 FUNCTIONAL BLOCK DIAGRAM

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

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.

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, and amplitude).

CHONGMING GROUP (HK) INT'L CO., LTD. located in Hong Kong and Shenzhen. We are an independent Distributor of Electronic Components,established in 2008. AS a growing fast company, CM GROUP is renowned for its world-class efficiency, excellent services, and extraordinary ability to supply electronic components that are hard to find and even obsolete. We have taken pride in our innovation, reliability and service, especially in the semiconductor marketplace.
Our distribution brands include XILINX，ALTERA，ATMEL, INFINEON, ST,SAMSUNG，TEXAS INSTRUMENTS，ON，TOSHIBA，，MICROCHIP，CYPRESS，FREESCALE，etc. We distributes over 200,000 products ranging from semiconductors to resistors, capacitors, diodes, inductors, connectors, transistors, sensors and so on.
Our mission is to meet and exceed all the expecations of what we supply to customers.