参数资料
型号: AD8376ACPZ-R7
厂商: Analog Devices Inc
文件页数: 9/24页
文件大小: 0K
描述: IC AMP VGA DIFF DUAL 32LFCSP
产品培训模块: Differential Circuit Design Techniques for Communication Applications
设计资源: Using AD8376 to Drive Wide Bandwidth ADCs for High IF AC-Coupled Appls (CN0002)
High Performance, Dual Channel IF Sampling Receiver (CN0140)
标准包装: 1
放大器类型: 可变增益
电路数: 2
输出类型: 差分
转换速率: 5000 V/µs
-3db带宽: 700MHz
电流 - 输入偏压: 900nA
电流 - 电源: 250mA
电压 - 电源,单路/双路(±): 4.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 标准包装
产品目录页面: 775 (CN2011-ZH PDF)
其它名称: AD8376ACPZ-R7DKR
Data Sheet
AD8376
Rev. B | Page 17 of 24
Figure 42 is optimized for driving some of Analog Devices
popular unbuffered ADCs, such as the AD9246, AD9640,
and AD6655. Table 5 includes antialiasing filter component
recommendations for popular IF sampling center frequencies.
Inductor L5 works in parallel with the on-chip ADC input
capacitance and a portion of the capacitance presented by C4 to
form a resonant tank circuit. The resonant tank helps to ensure
the ADC input looks like a real resistance at the target center
frequency. Additionally, the L5 inductor shorts the ADC inputs
at dc, which introduces a zero into the transfer function. In
addition, the ac coupling capacitors and the bias chokes introduce
additional zeros into the transfer function. The final overall
frequency response takes on a band-pass characteristic, helping
to reject noise outside of the intended Nyquist zone. Table 5
provides initial suggestions for prototyping purposes. Some
empirical optimization may be needed to help compensate for
actual PCB parasitics.
5
1nF
50
1:3
1/2
AD8376
301
C2
A0 TO A4
C4
1H
L1
L3
CML
165
L5
AD9246
AD9640
AD6655
06725-
042
Figure 42. Narrow-Band IF Sampling Solution for Unbuffered ADC Applications
Table 5. Interface Filter Recommendations for Various IF Sampling Frequencies
Center Frequency
1 dB Bandwidth
L1
C2
L3
C4
L5
96 MHz
27 MHz
390 nH
5.6 pF
390 nH
25 pF
100 nH
140 MHz
30 MHz
330 nH
3.3 pF
330 nH
20 pF
56 nH
170 MHz
32 MHz
270 nH
2.7 pF
270 nH
20 pF
39 nH
211 MHz
32 MHz
220 nH
2.2 pF
220 nH
18 pF
27 nH
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