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

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

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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• Military : -55 to +125 degrees Celsius
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• Automotive: -40 to +125 degrees Celsius

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