参数资料
| 型号： | AD8138ARZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF LDIST LP 95MA 8SOIC |
| 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： | 2,500 |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
AD8138
Rev. F | Page 21 of 24
HIGH PERFORMANCE ADC DRIVING
The circuit in Figure 46 shows a simplified front-end
connection for an AD8138 driving an AD9224, a 12-bit,
40 MSPS ADC. The ADC works best when driven differentially,
which minimizes its distortion. The AD8138 eliminates the
need for a transformer to drive the ADC and performs single-
ended-to-differential conversion, common-mode level-shifting,
and buffering of the driving signal.
The positive and negative outputs of the AD8138 are connected
to the respective differential inputs of the AD9224 via a pair of
49.9 Ω resistors to minimize the effects of the switched-capacitor
front end of the AD9224. For best distortion performance, it
runs from supplies of ±5 V.
The AD8138 is configured with unity gain for a single-ended,
input-to-differential output. The additional 23 Ω, 523 Ω total, at
the input to IN is to balance the parallel impedance of the
50 Ω source and its 50 Ω termination that drives the
noninverting input.
The signal generator has a ground-referenced, bipolar output,
that is, it drives symmetrically above and below ground.
common-mode of the AD8138 at 2.5 V, which is the midsupply
level for the AD9224. This voltage is bypassed by a 0.1 μF
capacitor.
The full-scale analog input range of the AD9224 is set to
4 V p-p, by shorting the SENSE terminal to AVSS. This has
been determined to be the scaling to provide minimum
harmonic distortion.
For the AD8138 to swing at 4 V p-p, each output swings 2 V p-p
while providing signals that are 180° out of phase. With a
common-mode voltage at the output of 2.5 V, each AD8138
output swings between 1.5 V and 3.5 V.
A ground-referenced 4 V p-p, 5 MHz signal at DIN+ was used to
test the circuit in Figure 46. When the combined-device circuit
was run with a sampling rate of 20 MSPS, the spurious-free
dynamic range (SFDR) was measured at 85 dBc.
49.9
0.1pF
523
499
49.9
499
VINB
+5V
DRVDD
AVDD
VINA
+5V
AD9224
VOCM
AD8138
–5V
SENSE
+
DIGITAL
OUTPUTS
0.1pF
DRVSS
CML
AVSS
49.9
50
SOURCE
8
2
1
6
3
5
4
24
23
15 26
16 25
28
17
22
27
01
07
3-
0
45
Figure 46. AD8138 Driving an AD9224, a 12-Bit, 40 MSPS ADC
相关PDF资料 |
PDF描述 |
|---|---|
| VE-24M-IV-F1 | CONVERTER MOD DC/DC 10V 150W |
| VI-2T0-MW-B1 | CONVERTER MOD DC/DC 5V 100W |
| AD8138ARMZ-REEL | IC AMP DIFF LDIST LP 95MA 8MSOP |
| VE-24L-IV-F4 | CONVERTER MOD DC/DC 28V 150W |
| LTC6406IMS8E#PBF | IC AMP/DRIVER DIFF 8-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8138-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Distortion Differential ADC Driver |
| AD8138SRMZ-EP-R7 | 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 |
| AD8139 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Rail-to-Rail, Differential ADC Driver |
| AD8139_07 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Rail-to-Rail, Differential ADC Driver |
| AD8139ACP | 制造商:Analog Devices 功能描述:ULTRA LOW NOISE FULLY DIFFERENTIAL ADC DRIVER - Bulk |
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