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參數(shù)資料
| 型號： | AD9750 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10-Bit D/A Converter(100MSPS,10位D/A轉(zhuǎn)換器) |
| 中文描述： | 10位D / A轉(zhuǎn)換器（100MSPS時，10位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 13/21頁 |
| 文件大小： | 280K |
| 代理商： | AD9750 |
AD9750
–13–
REV. 0
PRELIMINARY
DATA
RATIO (f
CLOCK
/f
OUT
)
TECHNICAL
5MSPS
impedance matching purposes. Note that the transformer
provides ac coupling only.
Conversely, I
DVDD
is dependent on both the digital input wave-
form, f
CLOCK
, and digital supply DVDD. Figures 29 and 30
show I
DVDD
as a function of full-scale sine wave output ratios
(f
OUT
/f
CLOCK
) for various update rates with DVDD = 5 V and
DVDD = 3 V, respectively. Note, how I
DVDD
is reduced by more
than a factor of 2 when DVDD is reduced from 5 V to 3V.
OUTFS
– mA
30
0
2
20
4
6
8
10
12
14
16
18
25
20
15
10
5
I
A
Figure 28. I
AVDD
vs. I
OUTFS
18
16
0
0.01
1
0.1
I
D
8
6
4
2
12
10
14
125MSPS
100MSPS
50MSPS
25MSPS
Figure 29. I
DVDD
vs. Ratio @ DVDD = 5 V
RATIO (f
CLOCK
/f
OUT
)
8
0
0.01
1
0.1
I
D
6
4
2
125MSPS
100MSPS
50MSPS
25MSPS
5MSPS
Figure 30. I
DVDD
vs. Ratio @ DVDD = 3 V
APPLYING THE AD9750
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configura-
tions for the AD9750. 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 opti-
mum 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.
A single-ended output is suitable for applications requiring a
unipolar voltage output. A positive unipolar output voltage will
result if IOUTA and/or IOUTB is connected to an appropri-
ately sized load resistor, R
LOAD
, referred to ACOM. This con-
figuration may be more suitable for a single-supply system
requiring a dc coupled, ground referred output voltage. Alterna-
converting I
OUTA
or I
OUTB
into a negative unipolar voltage. This
configuration provides the best dc linearity since IOUTA or
IOUTB is maintained at a virtual ground. Note, IOUTA pro-
vides slightly better performance than IOUTB.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-
single-ended signal conversion as shown in Figure 31. A
differentially coupled transformer output provides the optimum
distortion performance for output signals whose spectral content
as the Mini-Circuits T1-1T provides excellent rejection of
common-mode distortion (i.e., even-order harmonics) and noise
over a wide frequency range. It also provides electrical isolation
and the ability to deliver twice the power to the load. Trans-
formers with different impedance ratios may also be used for
R
LOAD
AD9750
MINI-CIRCUITS
T1-1T
OPTIONAL R
DIFF
IOUTA
IOUTB
Figure 31. 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 IOUTA and IOUTB (i.e., V
OUTA
and V
OUTB
) swing sym-
metrically around ACOM and should be maintained with the
specified output compliance range of the AD9750. A differential
resistor, R
DIFF
, may be inserted in applications in which the
output of the transformer is connected to the load, R
LOAD
, via a
passive reconstruction filter or cable. R
DIFF
is determined by the
transformer’s impedance ratio and provides the proper source
termination which results in a low VSWR. Note that approxi-
mately half the signal power will be dissipated across R
DIFF
.
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參數(shù)描述 |
|---|---|
| AD9750AR | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W 制造商:Analog Devices 功能描述:DAC SGL 10-BIT 28SOIC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:10 BIT 12500 MSPS+ TXDAC D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:0BIT DAC POLY FUSE 9750 SOIC28 |
| AD9750ARRL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:10 BIT 125 MSPS+ TXDAC D/A CONVERTER - Bulk |
| AD9750ARU | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin TSSOP 制造商:Rochester Electronics LLC 功能描述:10 BIT 125 MSPS+ TXDAC D/A CONVERTER - Bulk |
| AD9750ARURL7 | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:10 BIT 125 MSPS+ TXDAC D/A CONVERTER - Bulk |
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