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參數(shù)資料
| 型號： | AD9763 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10-Bit, 125 MSPS Dual TxDAC+ D/A Converter |
| 中文描述： | 10位，125 MSPS的TxDAC系列雙D / A轉(zhuǎn)換 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 460K |
| 代理商： | AD9763 |
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REV. B
AD9763
–
14
–
RATIO
–
f
OUT
/f
CLK
0
0.10
0
I
D
–
2
4
6
8
10
12
14
0.20
0.30
0.40
0.50
16
18
125MSPS
100MSPS
65MSPS
25MSPS
5MSPS
Figure 32. I
DVDD
vs. Ratio @ DVDD = 3 V
APPLYING THE AD9763
Output Configurations
The following sections illustrate some typical output configura-
tions for the AD9763. Unless otherwise noted, it is assumed
that I
OUTFS
is set to a nominal 20 mA. For applications requir-
ing the optimum dynamic performance, a differential output
configuration is suggested. A differential output configuration
may consist of either an RF transformer or a differential op
amp configuration. The transformer configuration provides the
optimum high frequency performance and is recommended for
any application allowing for ac coupling. The differential op
amp configuration is suitable for applications requiring dc
coupling, a bipolar output, signal gain and/or level-shifting,
within the bandwidth of the chosen op amp.
A single-ended output is suitable for applications requiring a
unipolar voltage output. A positive unipolar output voltage will
result if I
OUTA
and/or I
OUTB
is connected to an appropriately-
sized load resistor, R
LOAD
, referred to ACOM. This configuration
may be more suitable for a single-supply system requiring a
dc coupled, ground referred output voltage. Alternatively, an
amplifier could be configured as an I-V converter, thus convert-
ing I
OUTA
or I
OUTB
into a negative unipolar voltage. This con-
figuration provides the best dc linearity since I
OUTA
or I
OUTB
is
maintained at a virtual ground. Note that I
OUTA
provides slightly
better performance than I
OUTB
.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-
single-ended signal conversion as shown in Figure 33. A
differentially coupled transformer output provides the opti-
mum distortion performance for output signals whose spectral
content lies within the transformer’s passband. An RF trans-
former such as the Mini-Circuits T1-1T provides excellent
rejection of common-mode distortion (i.e., even-order har-
monics) and noise over a wide frequency range. It also provides
electrical isolation and the ability to deliver twice the power to
the load. Transformers with different impedance ratios may
also be used for impedance matching purposes. Note that the
transformer provides ac coupling only.
R
LOAD
AD9763
MINI-CIRCUITS
T1-1T
OPTIONAL
R
DIFF
I
OUTA
I
OUTB
Figure 33. Differential Output Using a Transformer
The center tap on the primary side of the transformer must be
connected to ACOM to provide the necessary dc current path
for both I
OUTA
and I
OUTB
. The complementary voltages appear-
ing at I
OUTA
and I
OUTB
(i.e., V
OUTA
and V
OUTB
) swing symmetri-
cally around ACOM and should be maintained with the specified
output compliance range of the AD9763. A differential resistor,
R
DIFF
, may be inserted in applications where the output of the
transformer is connected to the load, R
LOAD
, via a passive recon-
struction filter or cable. R
DIFF
is determined by the transformer’s
impedance ratio and provides the proper source termination
that results in a low VSWR. Note that approximately half the
signal power will be dissipated across R
DIFF
.
DIFFERENTIAL COUPLING USING AN OP AMP
An op amp can also be used to perform a differential-to-single-
ended conversion as shown in Figure 34. The AD9763 is con-
figured with two equal load resistors, R
LOAD
, of 25
. The
differential voltage developed across I
OUTA
and I
OUTB
is con-
verted to a single-ended signal via the differential op amp con-
figuration. An optional capacitor can be installed across I
OUTA
and I
OUTB
, forming a real pole in a low-pass filter. The addition
of this capacitor also enhances the op amps distortion perfor-
mance by preventing the DACs high slewing output from over-
loading the op amp’s input.
The common-mode rejection of this configuration is typically
determined by the resistor matching. In this circuit, the differ-
ential op amp circuit using the AD8047 is configured to provide
some additional signal gain. The op amp must operate from a
dual supply since its output is approximately
±
1.0 V. A high
speed amplifier capable of preserving the differential perfor-
mance of the AD9763, while meeting other system level
objectives (i.e., cost, power), should be selected. The op
amp’s differential gain, its gain setting resistor values, and
full-scale output swing capabilities should all be considered
when optimizing this circuit.
AD9763
I
OUTA
I
OUTB
500
225
225
500
25
25
AD8047
C
OPT
Figure 34. DC Differential Coupling Using an Op Amp
相關PDF資料 |
PDF描述 |
|---|---|
| AD9763-EB | 10-Bit, 125 MSPS Dual TxDAC+ D/A Converter |
| AD9763AST | 10-Bit, 125 MSPS Dual TxDAC+ D/A Converter |
| AD9764 | 14-Bit, 125 MSPS TxDAC D/A Converter |
| AD9764-EB | 14-Bit, 125 MSPS TxDAC D/A Converter |
| AD9764AR | 14-Bit, 125 MSPS TxDAC D/A Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9763_11 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters |
| AD9763AST | 制造商:Analog Devices 功能描述:DAC 2-CH Segment 10-bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:10 BIT, 125 MSPS DUAL TXDAC+ - Tape and Reel 制造商:Analog Devices 功能描述:IC 10-BIT DAC |
| AD9763ASTRL | 制造商:Analog Devices 功能描述:DAC 2-CH Segment 10-bit 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:10 BIT, 125 MSPS DUAL TXDAC+ - Tape and Reel |
| AD9763ASTZ | 功能描述:IC DAC 10BIT DUAL 125MSPS 48LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:TxDAC+® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD9763ASTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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