AD9856_15 Datasheet, PDF (1/36 Pages) Analog Devices – CMOS 200 MHz Quadrature Digital Upconverter

FEATURES
Universal low cost modulator solution for communications
applications
DC to 80 MHz output bandwidth
Integrated 12-bit D/A converter
Programmable sample rate interpolation filter
Programmable reference clock multiplier
Internal SIN(x)/x compensation filter
>52 dB SFDR @ 40 MHz AOUT
>48 dB SFDR @ 70 MHz AOUT
>80 dB narrow-band SFDR @ 70 MHz AOUT
+3 V single-supply operation
Space-saving surface-mount packaging
Bidirectional control bus interface
Supports burst and continuous Tx modes
Single-tone mode for frequency synthesis applications
Four programmable, pin-selectable, modulator profiles
Direct interface to AD8320/AD8321 PGA cable driver
CMOS 200 MHz
Quadrature Digital Upconverter
AD9856
APPLICATIONS
HFC data, telephony, and video modems
Wireless and satellite communications
Cellular base stations
GENERAL DESCRIPTION
The AD9856 integrates a high speed, direct digital synthesizer
(DDS), a high performance, high speed, 12-bit digital-to-analog
converter (DAC), clock multiplier circuitry, digital filters, and
other DSP functions on a single chip to form a complete
quadrature digital upconverter device. The AD9856 is intended
to function as a universal I/Q modulator and agile upconverter
for communications applications where cost, size, power
dissipation, and dynamic performance are critical attributes.
The AD9856 is available in a space-saving surface-mount
package, and is specified to operate over the extended industrial
temperature range of −40°C to +85°C.
COMPLEX
DATA IN
TxENABLE
(I /Q SYNC)
FUNCTIONAL BLOCK DIAGRAM
12
4 × TO 8 ×
12
SELECTABLE
INTERPOLATING
HALFBANDS
12
4 × TO 8 ×
SELECTABLE
12
INTERPOLATING
HALFBANDS
4 × TO 20 × PROG.
CLOCK
MULTIPLIER
2 × TO 63 ×
12
SELECTABLE
INTERPOLATOR
12
12
2 × TO 63 ×
12
12
SELECTABLE
INTERPOLATOR
12
12
SINE COSINE
DDS AND CONTROL FUNCTIONS
AD9856
INV ¹² 12-BIT
SINC
DAC
DC-80 MHz
OUTPUT
DAC
R_SET
SPI INTERFACE
TO AD8320/AD8321
PROGRAMMABLE
CABLE DRIVER
AMPLIFIER
REFERENCE
CLOCK IN
PROFILE
SELECT
1–2
PROFILE
SELECT
3–4
MASTER
RESET
BIDIRECTIONAL SPI CONTROL INTERFACE:
32-BIT FREQUENCY TUNING WORD
FREQUENCY UPDATE
INTERPOLATION FILTER RATE
REFERENCE CLOCK MULTIPLIER RATE
SPECTRAL PHASE INVERSION ENABLE
CABLE DRIVER AMPLIFIER CONTROL
Figure 1.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.