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| 型号： | ADA4927-2YCPZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF DIFF DUAL LN 24LFCSP |
| 特色产品： | ADA4927: Ultralow Distortion Current Feedback Differential ADC Driver |
| 标准包装： | 1 |
| 放大器类型： | 电流反馈 |
| 电路数： | 2 |
| 输出类型： | 差分 |
| 转换速率： | 5000 V/µs |
| -3db带宽： | 2.3GHz |
| 电流 - 输入偏压： | 500nA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 20mA |
| 电流 - 输出 / 通道： | 65mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 标准包装 |
| 产品目录页面： | 765 (CN2011-ZH PDF) |
| 其它名称： | ADA4927-2YCPZ-R2DKR |
ADA4927-1/ADA4927-2
Rev. A | Page 23 of 24
HIGH PERFORMANCE ADC DRIVING
The ADA4927 is ideally suited for high gain, broadband ac-
coupled and differential-to-differential applications on a single
supply, though other applications are possible. Compared with
voltage feedback amplifiers, the current feedback architecture
provides superior distortion and bandwidth performance at
high gains. This is because the ideal current feedback amplifier
loop gain depends only on the feedback value and open-loop
transimpedance, T(s).
The circuit in Figure 58 shows a front-end connection for an
ADA4927 driving an AD9445, 14-bit, 105 MSPS ADC, with ac
coupling on the ADA4927 input and output. (The AD9445
achieves its optimum performance when driven differentially.)
The ADA4927 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 ADA4927 is configured with a single 5 V supply and gain
of 10 for a single-ended input to differential output. The 158 Ω
termination resistor, in parallel with the single-ended input
impedance of approximately 73.2 Ω, provides a 50 Ω termination
for the source. The additional 38.3 Ω at the inverting input closely
matches the parallel impedance of the 50 Ω source and the
termination resistor driving the noninverting input. Because of the
high gain, a few iterations of the termination technique described
in the Terminating a Single-Ended Input section are required.
Two objectives of the design are to make RF close to 500 Ω and
obtain resistor values that are close to standard 1% values.
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 ADA4927 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.
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 58.
VIN–
VIN+
47pF
30nH
24.3
50
SIGNAL
GENERATOR
39.2
VOCM
5V
ADA4927
+
158
511
38.3
511
14
BUFFER T/H
ADC
CLOCK/
TIMING
REF
SENSE
AGND
0.1F
AD9445
3.3V (A)
AVDD1
5V (A)
AVDD2
3.3V (D)
DRVDD
07
57
4-
05
8
Figure 58. ADA4927 Driving an AD9445 ADC with AC-Coupled Input and Output
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| ADA4927-2YCPZ-R7 | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 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-SOIC 包装:带卷 (TR) |
| ADA4927-2YCPZ-RL | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 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-SOIC 包装:带卷 (TR) |
| ADA4930-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Noise Drivers for Low Voltage ADCs |
| ADA4930-1SCPZ-EPR2 | 制造商:Analog Devices 功能描述:ULTRALOW DIST LOW VLTG ADC DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:Differential Amplifiers UltraLow Dist Low Vltg ADC Driver |
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