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参数资料
| 型号： | ADA4941-1YR-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4941-1YR |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 差分 |
| 板类型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 8-SOIC 封装 |
ADA4939-1/ADA4939-2
Rev. 0 | Page 23 of 24
HIGH PERFORMANCE ADC DRIVING
The ADA4939 is ideally suited for broadband ac-coupled and
differential-to-differential applications on a single supply.
The circuit in Figure 54 shows a front-end connection for an
ADA4939 driving an AD9445, 14-bit, 105 MSPS ADC, with ac
coupling on the ADA4939 input and output. (The AD9445
achieves its optimum performance when driven differentially.)
The ADA4939 eliminates the need for a transformer to drive
the ADC and performs a single-ended-to-differential conversion
and buffering of the driving signal.
The ADA4939 is configured with a single 5 V supply and gain
of 2 for a single-ended input to differential output. The 60.4 Ω
termination resistor, in parallel with the single-ended input
impedance of approximately 300 Ω, provides a 50 Ω termination
for the source. The additional 27.4 Ω (227.4 Ω total) at the
inverting input balances the parallel impedance of the 50 Ω
source and the termination resistor driving the noninverting input.
In this example, the signal generator has a 1 V p-p symmetric,
ground-referenced bipolar output when terminated in 50 Ω.
The VOCM pin of the ADA4939 is bypassed for noise reduction
and left floating such that the internal divider sets the output
common-mode voltage nominally at midsupply. Because the
inputs are ac-coupled, no dc common-mode current flows in
the feedback loops, and a nominal dc level of midsupply is
present at the amplifier input terminals. Besides placing the
amplifier inputs at their optimum levels, the ac coupling technique
lightens the load on the amplifier and dissipates less power than
applications with dc-coupled inputs. With an output common-
mode voltage of nominally 2.5 V, each ADA4937 output swings
between 2.0 V and 3.0 V, providing a gain of 2 and a 2 V p-p
differential signal to the ADC input.
The output of the amplifier is ac-coupled to the ADC through a
second-order, low-pass filter with a cutoff frequency of 100 MHz.
This reduces the noise bandwidth of the amplifier and isolates
the driver outputs from the ADC inputs.
The AD9445 is configured for a 2 V p-p full-scale input by
connecting the SENSE pin to AGND, as shown in Figure 54.
07
42
9-
06
1
VIN–
VIN+
47pF
30nH
24.3
50
SIGNAL
GENERATOR
200
VOCM
5V
ADA4939
+
60.4
412
27.4
412
14
BUFFER T/H
ADC
CLOCK/
TIMING
REF
SENSE
AGND
0.1F
AD9445
3.3V (A)
AVDD1
5V (A)
AVDD2
3.3V (D)
DRVDD
Figure 54. ADA4939 Driving an AD9445 ADC with AC-Coupled Input and Output
相关PDF资料 |
PDF描述 |
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| ADA4939-2YCP-EBZ | BOARD EVAL FOR ADA4939-2YCP |
| ADA4941-1YCP-EBZ | BOARD EVAL FOR ADA4941-1YCP |
| ADA4938-1YCP-EBZ | BOARD EVAL FOR ADA4938-1YCP |
| ADA4939-1YCP-EBZ | BOARD EVAL FOR ADA4939-1YCP |
| 4-1589788-9 | WDUALOBE CONNECTOR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4941-1YRZ | 功能描述:IC DIFF ADC DVR 18BIT 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 |
| ADA4941-1YRZ-R7 | 功能描述:IC DIFF ADC DRIVER 18BIT 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 |
| ADA4941-1YRZ-RL | 功能描述:IC DIFF ADC DRIVER 18BIT 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 |
| ADA4950-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3 |
| ADA4950-1YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4950-1YCP RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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