AD9856 Datasheet, PDF (1/32 Pages) Analog Devices – CMOS 200 MHz Quadrature Digital Upconverter

a
CMOS 200 MHz
Quadrature Digital Upconverter
AD9856
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 A_OUT
>48 dB SFDR @ 70 MHz A_OUT
>80 dB Narrowband SFDR @ 70 MHz A_OUT
+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
APPLICATIONS
HFC Data, Telephony and Video Modems
Wireless and Satellite Communications
Cellular Basestations
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 onto 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 dissi-
pation and dynamic performance are critical attributes.
The AD9856 is available in a space-saving surface mount pack-
age and specified to operate over the extended industrial tem-
perature range of –40°C to +85°C.
COMPLEX
DATA IN
TxENABLE
(I/Q SYNC)
FUNCTIONAL BLOCK DIAGRAM
12
4؋–8؋
SELECTABLE
12
2؋ TO 63؋ 12
SELECTABLE
INTERPOLATING
INTERPOLATOR
HALFBANDS
12
4؋–8؋
SELECTABLE
INTERPOLATING
HALFBANDS
12
2؋ TO 63؋
SELECTABLE
INTERPOLATOR
12
12
12
AD9856
12 _INV 12 _12-BIT
SINC
DAC
12
12
4؋–20؋PROG.
CLOCK
MULTIPLIER
SINE COSINE
DDS AND CONTROL FUNCTIONS
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
REV. B
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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 1999