- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373966 > AD9740AR (ANALOG DEVICES INC) 10-Bit, 165 MSPS TxDAC D/A Converter PDF資料下載
參數(shù)資料
| 型號： | AD9740AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 10-Bit, 165 MSPS TxDAC D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| 封裝： | 0.300 INCH, MS-013AE, SOIC-28 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 743K |
| 代理商： | AD9740AR |
REV. 0
AD9740
–12–
I
OUTFS
– mA
35
0
2
I
A
30
25
20
15
10
4
6
8
10
12
14
16
18
20
Figure 8. I
AVDD
vs. I
OUTFS
RATIO –
f
OUT
/
f
CLOCK
16
0.01
1
0.1
I
D
14
12
10
8
6
4
2
0
165MSPS
125MSPS
65MSPS
Figure 9. I
DVDD
vs. Ratio @ DVDD = 3.3 V
APPLYING THE AD9740
Output Configurations
The following sections illustrate some typical output configurations
for the AD9740. Unless otherwise noted, it is assumed that I
OUTFS
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 that allows 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 is connected to an appropriately
sized load resistor, R
LOAD
, 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.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-single-
ended signal conversion as shown in Figure 10. 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. It also provides electrical isolation and the ability
to deliver twice the power to the load. Transformers with different
impedance ratios may also be used for impedance matching
purposes. Note that the transformer provides ac coupling only.
R
LOAD
AD9740
MINI-CIRCUITS
T1–1T
OPTIONAL R
DIFF
IOUTA
IOUTB
Figure 10. 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 IOUTA and IOUTB. The complementary voltages appearing
at IOUTA and IOUTB (i.e., V
OUTA
and V
OUTB
) swing symmetri-
cally around ACOM and should be maintained with the specified
output compliance range of the AD9740. A differential resistor,
R
DIFF
, may be inserted in applications where the output of the
transformer is connected to the load, R
LOAD
, via a passive recon-
struction filter or cable. R
DIFF
is determined by the transformer’s
impedance ratio and provides the proper source termination that
results in a low VSWR. Note that approximately half the signal
power will be dissipated across R
DIFF
.
DIFFERENTIAL COUPLING USING AN OP AMP
An op amp can also be used to perform a differential-to-single-ended
conversion as shown in Figure 11. The AD9740 is configured with
two equal load resistors, R
LOAD
, of 25
. The differential voltage
developed across IOUTA and IOUTB is converted to a single-
ended signal via the differential op amp configuration. An optional
capacitor can be installed across IOUTA and IOUTB, forming a
real pole in a low-pass filter. The addition of this capacitor also
enhances the op amp’s distortion performance by preventing the
DACs high slewing output from overloading the op amp’s input.
AD9740
IOUTA
IOUTB
C
OPT
500
225
225
500
25
25
AD8047
Figure 11. DC Differential Coupling Using an Op Amp
The common-mode rejection of this configuration is typically
determined by the resistor matching. In this circuit, the differential
op amp circuit using the AD8047 is configured to provide some
additional signal gain. The op amp must operate off of a dual
supply since its output is approximately
±
1.0 V. A high-speed
amplifier capable of preserving the differential performance of the
相關PDF資料 |
PDF描述 |
|---|---|
| AD9740ARU | 10-Bit, 165 MSPS TxDAC D/A Converter |
| AD9742 | 12-Bit, 165 MSPS TxDAC D/A Converter |
| AD9742-EB | 12-Bit, 165 MSPS TxDAC D/A Converter |
| AD9742AR | 12-Bit, 165 MSPS TxDAC D/A Converter |
| AD9742ARU | 12-Bit, 165 MSPS TxDAC D/A Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9740ARRL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 10-bit 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:DAC SGL CURRENT STEERING 10-BIT 28SOIC W - Tape and Reel |
| AD9740ARU | 功能描述:IC DAC 10BIT 210MSPS 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC® 標準包裝:47 系列:- 設置時間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
| AD9740ARURL7 | 功能描述:IC DAC 10BIT 210MSPS 28-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC® 標準包裝:47 系列:- 設置時間:2µs 位數(shù):14 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
| AD9740ARUZ | 功能描述:IC DAC 10BIT 210MSPS 28-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:TxDAC® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD9740ARUZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 210 MSPS TxDAC D/A Converter |
發(fā)布緊急采購，3分鐘左右您將得到回復。