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

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 ...More

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

Product 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 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

    • Data Sheet, Rev. A, 1/08

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    • 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
    • Multichip synchronization
    • See Data Sheet for Additional Information
    • I/O Interface: Serial
    • Master fclk : 1000MHz
    • Resolution (Bits): 14bit
    • I Supply total (max): 759mA
    • FS Iout (mA nom): 20mA
    • Compliance Range (V): 0.5V
    • REFCLK Multiplier: Yes

    Functional Block Diagram for AD9957

    Similar Products

    arrow View Full Interactive Product Selection Table
    Part# Master fclk Resolution (Bits) SNR (dB) Nominal Supply (V) I Supply total (max) FS Iout (mA nom) Compliance Range (V) REFCLK Multiplier I/O Interface Price* (1000-4999) Function Product Description
    AD9856 200MHz 12 n/a Single(+3) 530mA 10 1.5 Yes Parallel $15.47 DDS, Modulator, Quadrature Dig Upconv CMOS, 12-Bit, 200 MHz, Quadrature Digital Upconverter
    AD9857 200MHz 14 n/a Single(+3.3) 615mA 20 1 Yes Serial $15.58 DDS, Modulator, Quadrature Dig Upconv CMOS, 200 MSPS, 14-Bit Quadrature Digital Upconverter
    AD9957 1000MHz 14 - Multi(+1.8, +3.3) 759mA 20 0.5 Yes Serial $21.25 Modulator, Quadrature Dig Upconv 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.