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| 型号： | AD8170ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC MUX SW W/AMP 250MHZ 8-SOIC |
| 标准包装： | 98 |
| 应用： | 带放大器的多路复用器 |
| 电源电压： | ±4 V ~ 6 V |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 802 (CN2011-ZH PDF) |
AD8170/AD8174
–9–
REV. 0
Equation 4 can be used to calculate expected gain error due to
the current feedback amplifier’s finite transimpedance and
common mode rejection. For low gains and recommended
feedback resistors, this will be typically less than 0.4%. For
most applications with gain greater than 1, the dominant source
of gain error will most likely be the ratio-match of the external
resistors. All of the dominant contributors to gain error are
associated with the buffer amplifier and external resistors.
These do not change as different channels are selected, so
channel-to-channel gain match of less than 0.05% is easily
attained.
G
= 1+
RF
RG
RT
RT + RIN 1+
RF
RG
+ RF
1
CMRR
[]
(4)
↑
Ideal Gain
Error Terms
RT = Amplifier Transresistance = 600 k
RIN = Amplifier Input Resistance
100
CMRR = Amplifier Common-Mode Rejection
–52 dB
Choice of External Resistors
The gain and bandwidth of the multiplexer are determined by
the closed-loop gain and bandwidth of the onboard current
feedback amplifier. These both may be customized by the
external resistor feedback network. Table III shows typical
bandwidths at some common closed loop gains for given
feedback and gain resistors (RF and RG, respectively).
The choice of RF is not critical unless the widest and flattest
frequency response must be maintained. The resistors recom-
mended in the table result in the widest 0.1 dB bandwidth with
the least peaking. 1% resistors are recommended for applications
requiring the best control of bandwidth. Packaging parasitics vary
between DIP and SOIC packages, which may result in a slightly
different resistor value for optimum frequency performance.
Wider bandwidths than those listed in the table can be attained
by reducing RF at the expense of increased peaking.
To estimate the –3 dB bandwidth for feedback resistors not
listed in Table III, the following single-pole model for the
current feedback amplifier may be used:
ACL =
G
1
+ sC
T
RF +GN RIN
()
ACL = Closed Loop Gain
CT = Transcapacitance
0.8 pF
RF = Feedback Resistor
G = Ideal Closed Loop Gain
GN = (1 + RF/RG) = Noise Gain
RIN = Inverting Terminal Input Resistance
100
The –3 dB bandwidth is determined from this model as:
f –3dB
1
2
π C
T
RF +GN RIN
()
This model is typically good to within 15%.
Table III. Recommended Component Values
Small Signal
Large Signal
VOUT = 50 mV rms VOUT = 0.707 V rms
Gain RF ( )RG ( ) –3 dB BW (MHz) –3 dB BW (MHz)
AD8170R +1
1 k
—
710
270
+2
499
250
290
+10
499
54.9
50
55
+20
499
26.3
27
AD8174R +1
1 k
—
780
270
+2
549
235
280
+10
499
54.9
50
55
+20
499
26.3
27
Capacitive Load
The general rule for current feedback amplifiers is that the
higher the load capacitance, the higher the feedback resistor
required for stable operation. For the best combination of wide
bandwidth and clean pulse response, a small output resistor is
also recommended, as shown in Figure 24. Table IV contains
values of feedback and series resistors that result in the best
pulse response for a given load capacitance.
RG
VIN
SWITCH
RF
RT
50
VOUT
0.1F
10F
BUFFER
+VS
0.1F
10F
–VS
RS(OUT)
CL
(TO FET PROBE)
Figure 24. Circuit for Driving a Capacitive Load
Table IV. Recommended Feedback and Series Resistors and Bandwidth vs. Capacitive Load and Gain
G = +1
G = +2
G = +3
G
+4
VOUT = 2 V p-p
CL
RF
RSOUT
–3 dB BW
RF
RSOUT –3 dB BW
RF
RSOUT
–3 dB BW
RF
RSOUT
(pF)
( )( )
(MHz)
( )( )
(MHz)
( )( )
(MHz)
( )( )
20
1 k
50
149
1 k
20
174
499
25
170
499
20
50
1 k
30
104
1 k
15
117
1 k
15
98
499
20
100
2k
20
73
1 k
15
80
1 k
15
71
499
15
300
2k
20
27
1 k
15
34
1 k
15
33
499
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8170ARZ | 制造商:Analog Devices 功能描述:IC MUX W/AMP 250MHZ 8SOIC 制造商:Analog Devices 功能描述:IC, MUX, W/AMP, 250MHZ, 8SOIC |
| AD8170ARZ-R7 | 功能描述:IC MUX SWITCHING W/AMP 2:1 8SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD8170ARZ-RL | 功能描述:IC MUX SWITCHING W/AMP 2:1 8SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| AD8170-EB | 制造商:Analog Devices 功能描述:AD8170 EVALUATION BOARD - Bulk |
| AD8174 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:AD8170/AD8174: 250 MHz. 10 ns Switching Multiplexers w/Amplifier Data Sheet (Rev. 0. 10/96) |
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