参数资料
| 型号： | AD8138AARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER DIFF 8MSOP |
| 设计资源： | DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7352 (CN0040) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7356 (CN0041) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7357 (CN0061) |
| 标准包装： | 1 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uSOIC |
| 包装： | 标准包装 |
| 其它名称： | AD8138AARMZ-R7DKR |
AD8138
Rev. F | Page 22 of 24
3 V OPERATION
The circuit in Figure 47 shows a simplified front-end
connection for an AD8138 driving an AD9203, a 10-bit,
40 MSPS ADC that is specified to work on a single 3 V supply.
The ADC works best when driven differentially to make the
best use of the signal swing available within the 3 V supply.
The appropriate outputs of the AD8138 are connected to the
appropriate differential inputs of the AD9203 via a low-pass filter.
The AD8138 is configured for unity gain for a single-ended
input to differential output. The additional 23 Ω at the input to
IN is to balance the impedance of the 50 Ω source and its 50 Ω
termination that drives the noninverting input.
The signal generator has ground-referenced, bipolar output,
that is, it can drive symmetrically above and below ground.
Even though the AD8138 has ground as its negative supply, it
can still function as a level-shifter with such an input signal.
The output common mode is raised up to midsupply by the
voltage divider that biases VOCM. In this way, the AD8138
provides dc coupling and level-shifting of a bipolar signal,
without inverting the input signal.
The low-pass filter between the AD8138 and the AD9203
provides filtering that helps to improve the signal-to-noise ratio
(SNR). Lower noise can be realized by lowering the pole
frequency, but the bandwidth of the circuit is lowered.
49.9
0.1F
10k
523
499
10k
20pF
49.9
20pF
499
0.1F
3V
DRVDD
AVDD
AINN
AINP
0.1F
3V
49.9
AD8138
+
AD9203
8
2
1
3
5
4
6
28
2
27
25
26
1
AVSS DRVSS
DIGITAL
OUTPUTS
0
107
3-
0
46
Figure 47. AD8138 Driving an AD9203, a 10-Bit, 40 MSPS A/D Converter
The circuit was tested with a 0.5 dBFS signal at various
frequencies. Figure 48 shows a plot of the total harmonic
distortion (THD) vs. frequency at signal amplitudes of 1 V and
2 V differential drive levels.
FREQUENCY (MHz)
–40
T
H
D
(
d
Bc)
–45
–50
–55
–60
–65
–70
–75
–80
AD8138–2V
AD8138–1V
0
5
10
15
20
25
01
07
3-
0
4
7
Figure 48. AD9203 THD @ 0.5 dBFS AD8138
Figure 49 shows the signal-to-noise-plus distortion (SINAD)
under the same conditions as above. For the smaller signal
swing, the AD8138 performance is quite good, but its
performance degrades when trying to swing too close to the
supply rails.
FREQUENCY (MHz)
65
S
INA
D
(
d
Bc)
63
61
59
57
55
53
51
45
49
47
AD8138–1V
AD8138–2V
0
5
10
15
20
25
01
07
3-
0
48
Figure 49. AD9203 SINAD @ 0.5 dBFS AD8138
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| AD8138AARMZ-RL | 功能描述:IC ADC DRIVER DIFF 8MSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8138AARZ | 功能描述:IC DIFF ADC DVR LOW DISTOR 8SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8138AARZ-R7 | 功能描述:IC DIFF ADC DVR 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8138AARZ-RL | 功能描述:IC DIFF ADC DVR 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8138ACHIPS | 制造商:Analog Devices 功能描述: |
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