IOUTFS (mA) 40 20 0 20 10 0 I
參數(shù)資料
型號(hào)： AD9751-EB
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD9751
產(chǎn)品培訓(xùn)模塊： DAC Architectures
標(biāo)準(zhǔn)包裝： 1
系列： TxDAC®
DAC 的數(shù)量： 1
位數(shù)： 10
采樣率（每秒）： 300M
數(shù)據(jù)接口： 并聯(lián)
設(shè)置時(shí)間： 11ns
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： 板
已用 IC / 零件： AD9751
相關(guān)產(chǎn)品： AD9751ASTZRL-ND - IC DAC 10BIT 300MSPS 48LQFP
AD9751ASTZ-ND - IC DAC 10BIT 300MSPS 48-LQFP
REV. C
AD9751
–16–
IOUTFS (mA)
40
20
0
20
10
0
I AVDD
(mA)
35
10
30
25
15
5
2.5
5
7.5
12.5
15
17.5
Figure 17. IAVDD vs. IOUTFS
RATIO (fOUT/f DAC)
20
16
0
1
0.01
0.001
I DVDD
(mA)
18
14
12
10
8
6
4
2
0.1
300MSPS
200MSPS
100MSPS
50MSPS
25MSPS
Figure 18. IDVDD vs. fOUT/fDAC Ratio
fDAC (MHz)
10
0
300
150
0
PLL_V
DD
(mA)
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. fDAC
APPLYING THE AD9751
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configura-
tions for the AD9751. Unless otherwise noted, it is assumed
that IOUTFS 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 band-
width 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 IOUTA and/or IOUTB is connected to an appropriately
sized load resistor, RLOAD, 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
IOUTA or IOUTB into a negative unipolar voltage. This configuration
provides the best dc linearity, since IOUTA or IOUTB is maintained
at a virtual ground. Note that IOUTA provides slightly better per-
formance 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 20. A
differentially-coupled transformer output provides the optimum
distortion performance for output signals whose spectral content
lies within the transformer’s pass band. An RF transformer such
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. When IOUTA and IOUTB are
terminated to ground with 50
, this configuration provides
0dBm 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 IOUTA
and IOUTB 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
impedance ratios may also be used for impedance matching
purposes. Note that the transformer provides ac coupling only.
RLOAD
AD9751
MINI-CIRCUITS
T1-1T
IOUTA
IOUTB
Figure 20. Differential Output Using a Transformer
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