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參數(shù)資料
| 型號： | AD9762AR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/23頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT 125MSPS 28-SOIC |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 27 |
| 系列： | TxDAC® |
| 設置時間： | 35ns |
| 位數(shù)： | 12 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 160mW |
| 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） |
| 供應商設備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電流，單極；2 電流，雙極 |
| 采樣率（每秒）： | 125M |
AD9762
–15–
REV. B
IOUTFS – mA
30
0
220
4
6
8
10
121416
18
25
20
15
10
5
I AVDD
–
mA
Figure 47. IAVDD vs. IOUTFS
Conversely, IDVDD is dependent on both the digital input wave-
form, fCLOCK, and digital supply DVDD. Figures 48 and 49
show IDVDD as a function of full-scale sine wave output ratios
(fOUT/fCLOCK) for various update rates with DVDD = 5 V and
DVDD = 3 V, respectively. Note, how IDVDD is reduced by more
than a factor of 2 when DVDD is reduced from 5 V to 3 V.
RATIO (fOUT/fCLK)
18
16
0
0.01
1
0.1
I DVDD
–
mA
8
6
4
2
12
10
14
5MSPS
25MSPS
50MSPS
100MSPS
125MSPS
Figure 48. IDVDD vs. Ratio @ DVDD = 5 V
RATIO (fOUT/fCLK)
8
0
0.01
1
0.1
I DVDD
–
mA
6
4
2
5MSPS
25MSPS
50MSPS
100MSPS
125MSPS
Figure 49. IDVDD vs. Ratio @ DVDD = 3 V
APPLYING THE AD9762
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configura-
tions for the AD9762. 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
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.
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 configura-
tion provides the best dc linearity since IOUTA or IOUTB is
maintained at a virtual ground. Note, 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 50. 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
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. Trans-
formers with different impedance ratios may also be used for
impedance matching purposes. Note that the transformer
provides ac coupling only.
RLOAD
AD9762
22
21
MINI-CIRCUITS
T1-1T
OPTIONAL RDIFF
IOUTA
IOUTB
Figure 50. 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 appear-
ing at IOUTA and IOUTB (i.e., VOUTA and VOUTB) swing symmetri-
cally around ACOM and should be maintained with the specified
output compliance range of the AD9762. A differential resistor,
RDIFF, may be inserted in applications in which 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 which results in a low VSWR. Note that approxi-
mately half the signal power will be dissipated across RDIFF.
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| AD9762ARU | 功能描述:IC DAC 12BIT 125MSPS 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® 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD9762ARURL | 功能描述:INTEGRATED CIRCUIT 制造商:analog devices inc. 系列:* 包裝:帶卷（TR） 零件狀態(tài):最後搶購 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應商器件封裝:28-TSSOP 標準包裝:1 |
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