參數(shù)資料
型號(hào)： AD9753-EB
廠商： Analog Devices, Inc.
英文描述： 12-Bit, 300 MSPS High-Speed TxDAC+?? D/A Converter
中文描述： 12位，300 MSPS的高速TxDAC系列？？ D / A轉(zhuǎn)換
文件頁(yè)數(shù)： 15/26頁(yè)
文件大?。?/td> 904K
代理商： AD9753-EB
REV. 0
AD9753
–15–
I
OUTFS
–
mA
40
20
0
20
10
0
I
A
–
35
10
30
25
15
5
2.5
5
7.5
12.5
15
17.5
Figure 17. I
AVDD
vs. I
OUTFS
RATIO
–
f
OUT
/f
DAC
20
16
0
0.001
1
0.01
I
D
–
18
14
12
10
8
6
4
2
0.1
300MSPS
200MSPS
100MSPS
50MSPS
25MSPS
Figure 18. I
DVDD
vs. f
OUT
/f
DAC
Ratio
f
DAC
–
MHz
10
0
300
150
0
P
D
–
9
8
7
6
5
4
3
2
50
100
200
250
1
175
25
75
125
225
275
DIV SETTING 00
DIV SETTING 11
DIV SETTING 10
DIV SETTING 01
Figure 19. PLLVDD vs. f
DAC
APPLYING THE AD9753
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configura-
tions for the AD9753. 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, 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
are connected to an appropriately
sized load resistor, R
LOAD
, referred to ACOM. This configura-
tion 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 converting
I
OUTA
or I
OUTB
into a negative unipolar voltage. This configuration
provides the best dc linearity since I
OUTA
or I
OUTB
is maintained
at a virtual ground. Note that I
OUTA
provides slightly better per-
formance 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 20. A
differentially coupled transformer output provides the optimum
distortion performance for output signals whose spectral content
lies within the transformer’s passband. An RF transformer such
as the Mini-Circuits T1–1T provides excellent rejection of com-
mon-mode distortion (i.e., even-order harmonics) and noise
over a wide frequency range. When I
OUTA
and I
OUTB
are termi-
nated to ground with 50
, this configuration provides 0 dBm
power to a 50
load on the secondary with a DAC full-scale
current of 20 mA. A 2:1 transformer such as the Coilcraft
WB2040-PC can also be used in a configuration in which I
OUTA
and I
OUTB
are terminated to ground with 75
. This configura-
tion improves load matching and increases power to 2 dBm into
a 50
load on the secondary. Transformers with different imped-
ance ratios may also be used for impedance matching purposes.
Note that the transformer provides ac-coupling only.
R
LOAD
AD9753
MINI-CIRCUITS
T1-1T
I
OUTA
I
OUTB
Figure 20. Differential Output Using a Transformer
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