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參數(shù)資料
| 型號： | AD9772AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 14-Bit, 150 MSPS TxDAC⑩ with 2x Interpolation Filter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 14-BIT DAC, PQFP48 |
| 封裝： | PLASTIC, LQFP-48 |
| 文件頁數(shù)： | 21/30頁 |
| 文件大小： | 340K |
| 代理商： | AD9772AST |
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REV. 0
AD9772
–21–
+
–
100
F
ELECTROLYTIC
+
–
10
F–22
F
TANTALUM
0.1
F
CERAMIC
AVDD
ACOM
TTL/CMOS
LOGIC
CIRCUITS
+3.0V OR +3.3V
POWER SUPPLY
FERRITE
BEADS
Figure 46. Differential LC Filter for +3 V or 3.3 V
Applications
Maintaining low noise on power supplies and ground is critical
to obtain optimum results from the AD9772. If properly
implemented, ground planes can perform a host of functions on
high speed circuit boards: bypassing, shielding current trans-
port, etc. In mixed signal design, the analog and digital portions
of the board should be distinct from each other, with the analog
ground plane confined to the areas covering the analog signal
traces, and the digital ground plane confined to areas covering
the digital interconnects.
All analog ground pins of the DAC, reference and other analog
components should be tied directly to the analog ground plane.
The two ground planes should be connected by a path 1/8 to
1/4 inch wide underneath or within 1/2 inch of the DAC to
maintain optimum performance. Care should be taken to ensure
that the ground plane is uninterrupted over crucial signal paths.
On the digital side, this includes the digital input lines running
to the DAC. On the analog side, this includes the DAC output
signal, reference signal and the supply feeders.
The use of wide runs or planes in the routing of power lines is
also recommended. This serves the dual role of providing a low
series impedance power supply to the part, as well as providing
some “free” capacitive decoupling to the appropriate ground
plane. It is essential that care be taken in the layout of signal and
power ground interconnects to avoid inducing extraneous volt-
age drops in the signal ground paths. It is recommended that all
connections be short, direct and as physically close to the pack-
age as possible in order to minimize the sharing of conduction
paths between different currents. When runs exceed an inch in
length, strip line techniques with proper termination resistors
should be considered. The necessity and value of this resistor
will be dependent upon the logic family used.
For a more detailed discussion of the implementation and con-
struction of high speed, mixed signal printed circuit boards,
refer to Analog Devices’ application notes AN-280 and AN-333.
APPLICATIONS
MULTICARRIER
The AD9772’s wide dynamic range performance makes it well
suited for next generation base station applications in which it
reconstructs multiple modulated carriers over a designated
frequency band. Cellular multicarrier and multimode radios are
often referred to as software radios since the carrier tuning and
modulation scheme is software programmable and performed
digitally. The AD9772 is the recommended TxDAC in Analog
Device’s Softcell chipset which comprises the AD6622, Quadra-
ture Digital Upconverter IC, along with its companion Rx Digi-
tal Downconverter IC, the AD6624, and 14-bit, 65 MSPS
ADC, the AD6644. Figure 47 shows a generic software radio
Tx signal chain based on the AD9772/AD6622.
OTHER AD6622's FOR
INCREASED CHANNEL
CAPACITY
AD9772
PLLLOCK
CLK
SUMMATION
SPORT
RCF
CIC
FILTER
NCO
QAM
SPORT
RCF
CIC
FILTER
NCO
QAM
SPORT
RCF
CIC
FILTER
NCO
QAM
SPORT
RCF
CIC
FILTER
NCO
QAM
CLK
JTAG
m
PORT
AD6622
Figure 47. Generic Multicarrier Signal Chain Using the
AD6622 and AD9772
Figure 48 shows a spectral plot of the AD9772 operating at
64.54 MSPS reconstructing eight IS-136 modulated carriers
spread over a 25 MHz band. For this particular test scenario,
the AD9772 exhibited 74 dBc SFDR performance along with a
carrier-to-noise ratio (CNR) of 73 dB. Figure 49 shows a spec-
tral plot of the AD9772 operating at 52 MSPS reconstructing
four equal GSM carriers spread over a 15 MHz band. The
SFDR and CNR (in 100 kHz BW) measured to be 76 dBc and
83.4 dB respectively along with a channel power of –13.5 dBFS.
Note, the test vectors were generated using Rohde & Schwarz’s
WinIQSIM software.
FREQUENCY – MHz
0
0
–10
–20
–30
–40
–50
–60
5
10
15
35
–70
–80
–90
P
–100
20
25
30
Figure 48. Spectral Plot of AD9772 Reconstructing
Eight IS-136 Modulated Carriers @ f
DATA
= 64.54 MSPS,
PLLVDD = 0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9772EB | 14-Bit, 150 MSPS TxDAC⑩ with 2x Interpolation Filter |
| AD9772A | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| AD9772AAST | 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| AD9772 | 14-Bit,150 MSPS T×DAC+TM with 2× Interpolation Filter(單電源,過采樣,14位D/A轉(zhuǎn)換器) |
| AD9773 | 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9772EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter |
| AD9773 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Analog Devices: Data Converters: DAC 12-Bit, 10 ns to 100 ns Converters Selection Table |
| AD9773AST | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter |
| AD9773BSV | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:12BIT 160 MSPS DUAL TXDAC+ D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT DAC |
| AD9773BSVRL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP T/R |
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