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AD9856 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9856
Beschreibung CMOS 200 MHz Quadrature Digital Upconverter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD9856 Datasheet, Funktion
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 ×
SELECTABLE
INTERPOLATOR
12
12
12
12
SINE COSINE
DDS AND CONTROL FUNCTIONS
AD9856
INV 12 12-BIT
SINC
DAC
DC-80 MHz
OUTPUT
DAC
RSET
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: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.






AD9856 Datasheet, Funktion
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are limiting values, to be applied
individually, and beyond which the serviceability of the circuit
may be impaired. Functional operability under any of these
conditions is not necessarily implied. Exposure of absolute
maximum rating conditions for extended periods of time may
affect device reliability.
Table 2.
Parameter
Maximum Junction Temperature
Storage Temperature
VS
Operating Temperature
Digital Inputs
Lead Temperature (Soldering 10 sec)
Digital Output Current
θJA Thermal Impedance
Rating
150°C
−65°C to +150°C
4V
−40°C to +85°C
−0.7 V to +Vs
300°C
5 mA
38°C/W
AD9856
EXPLANATION OF TEST LEVELS
I. 100% production tested.
III. Sample tested only.
IV. Parameter is guaranteed by design and characterization
testing.
V. Parameter is a typical value only.
VI. Devices are 100% production tested at 25°C and
guaranteed by design and characterization testing for
industrial operating temperature range.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 5 of 36

6 Page









AD9856 pdf, datenblatt
TYPICAL PLOTS OF OUTPUT CONSTELLATIONS
TRACE A: CH 1 QPSK MEAS TIME
1.5
CONST
300
M
/DIV
TRACE A: CH 1 256QAM MEAS TIME
1
CONST
200
M
/DIV
AD9856
–1.5
–1.9607843757
1.96078437567
Figure 15. QPSK, 65 MHz, 2.56 MS/sec
TRACE A: CH 1 64QAM MEAS TIME
1
CONST
200
M
/DIV
–1
–1.3071895838
1.30718958378
Figure 18. 256-QAM, 42 MHz, 6 MS/sec
TRACE A: CH 1 MSK1 MEAS TIME
1.5
CONST
300
M
/DIV
–1
–1.3071895838
1.30718958378
Figure 16. 64-QAM, 42 MHz, 6 MS/sec
TRACE A: CH 1 16QAM MEAS TIME
1.25
CONST
250
M
/DIV
–1.5
–1.9607843757
1.96078437567
Figure 19. GMSK Modulation, 13 MS/sec
–1.25
–1.6339869797
1.63398697972
Figure 17. 16-QAM, 65 MHz, 2.56 MS/sec
Rev. C | Page 11 of 36

12 Page





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