IOUTFS (mA) 35 0 2 I
參數(shù)資料
型號： AD9740ARZRL
廠商： Analog Devices Inc
文件頁數(shù)： 9/32頁
文件大?。?/td> 0K
描述： IC DAC 10BIT 210MSPS 28-SOIC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1,000
系列： TxDAC®
設(shè)置時(shí)間： 11ns
位數(shù)： 10
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 145mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 2 電流，單極；2 電流，雙極
采樣率（每秒）： 210M
配用： AD9740ACP-PCBZ-ND - BOARD EVAL FOR AD9740ACP
AD9740
Rev. B | Page 17 of 32
IOUTFS (mA)
35
0
2
I AV
DD
(mA
)
30
25
20
15
10
4
6
8
10
121416
1820
02911-027
Figure 29. IAVDD vs. IOUTFS
RATIO (fOUT/fCLOCK)
20
0.01
1
0.1
I DVD
D
(m
A
)
14
16
18
12
10
8
6
4
2
0
165MSPS
210MSPS
65MSPS
0
291
1-
05
5
125MSPS
Figure 30. IDVDD vs. Ratio @ DVDD = 3.3 V
fCLOCK (MSPS)
I CL
KVDD
(mA)
11
0
150
100
50
200
250
PECL
DIFF
SE
10
9
8
7
6
5
4
3
2
1
02911-056
Figure 31. ICLKVDD vs. fCLOCK and Clock Mode
APPLYING THE AD9740
Output Configurations
The following sections illustrate some typical output
configurations for the AD9740. 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 can 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 that
allows ac coupling. The differential op amp configuration is
suitable for applications requiring dc coupling, 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
results if IOUTA and/or IOUTB is connected to an
appropriately sized load resistor, RLOAD, referred to ACOM.
This configuration can 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
because IOUTA or IOUTB is maintained at a virtual ground.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-
single-ended signal conversion, as shown in Figure 32. 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 (that is, 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. Transformers with different impedance ratios
can also be used for impedance matching purposes. Note that
the transformer provides ac coupling only.
RLOAD
AD9740
MINI-CIRCUITS
T1-1T
OPTIONAL RDIFF
IOUTA
IOUTB
22
21
02911-030
Figure 32. Differential Output Using a Transformer
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