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參數(shù)資料
| 型號： | AD9755-EB |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD9755 |
| 產品培訓模塊： | DAC Architectures |
| 標準包裝： | 1 |
| 系列： | TxDAC+® |
| DAC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 300M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設置時間： | 11ns |
| DAC 型： | 電流 |
| 工作溫度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9755 |
| 相關產品： | AD9755ASTZRL-ND - IC DAC 14BIT 300MSPS 48-LQFP AD9755ASTZ-ND - IC DAC 14BIT 300MSPS 48-LQFP |
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REV. B
AD9755
–16–
IOUTFS (mA)
40
20
0
20.0
10.0
0
I AVDD
(mA)
35
10
30
25
15
5
2.5
5.0
7.5
12.5
15.0
17.5
Figure 17. IAVDD vs. IOUTFS
RATIO (
fOUT/fDAC)
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 AD9755
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configurations
for the AD9755. Unless otherwise noted, it is assumed that IOUTFS
is set to a nominal 20 mA. For applications requiring 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 IOUTA and/or IOUTB are connected to an appropriately
sized load resistor, RLOAD, 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 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 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 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 configuration
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.
The center tap on the primary side of the transformer must be
connected to ACOM to provide the necessary dc current path for
both IOUTA and IOUTB. The complementary voltages appearing
at IOUTA and IOUTB (i.e., VOUTA and VOUTB) swing symmetrically
around ACOM and should be maintained with the specified
output compliance range of the AD9755. A differential resistor,
RDIFF, may be inserted into applications where the output of the
transformer is connected to the load, RLOAD, via a passive
reconstruction filter or cable. RDIFF is determined by the
transformer’s impedance ratio and provides the proper source
termination that results in a low VSWR.
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