參數(shù)資料
型號(hào)： ADA4950-1YCPZ-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 0K
描述： IC AMP DIFF LP 114MA 16LFCSP
標(biāo)準(zhǔn)包裝： 1
放大器類型： 差分
電路數(shù)： 1
輸出類型： 差分
轉(zhuǎn)換速率： 2900 V/µs
-3db帶寬： 750MHz
電壓 - 輸入偏移： 200µV
電流 - 電源： 9.5mA
電流 - 輸出 / 通道： 114mA
電壓 - 電源，單路/雙路(±)： 3 V ~ 11 V，±1.5 V ~ 5.5 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 16-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 16-LFCSP-VQ
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 765 (CN2011-ZH PDF)
其它名稱： ADA4950-1YCPZ-R7DKR
Data Sheet
ADA4950-1/ADA4950-2
Rev. A | Page 21 of 28
Terminating a Single-Ended Input
This section describes how to properly terminate a single-ended
input to the ADA4950-x with a gain of 1, RF = 500 , and RG =
500 . An example using an input source with a terminated output
voltage of 1 V p-p and source resistance of 50 illustrates the
steps that must be followed. Note that because the terminated
output voltage of the source is 1 V p-p, the open-circuit output
voltage of the source is 2 V p-p. The source shown in Figure 56
indicates this open-circuit voltage.
1. The input impedance is calculated using the following
formula:
Ω
667
)
500
(
2
500
1
500
)
(
2
1
,
=
+
×
=
+
×
=
F
G
F
G
se
IN
R
RS
50
VS
2V p-p
RIN, se
667
ADA4950-x
RL VOUT, dm
+VS
–VS
RG
500
RG
500
RF
500
RF
500
VOCM
07957-
156
Figure 56. Calculating Single-Ended Input Impedance, RIN
2. To match the 50 source resistance, calculate the
termination resistor, RT, using RT||667 = 50 . The
closest standard 1% value for RT is 53.6 .
ADA4950-x
RL
VOUT, dm
+VS
–VS
RS
50
RG
500
RG
500
RF
500
RF
500
VOCM
VS
2V p-p
RIN, se
50
RT
53.6
07957-
157
Figure 57. Adding Termination Resistor, RT
3. Figure 57 shows that the effective RG in the upper feedback
loop is now greater than the RG in the lower loop due to the
addition of the termination resistors. To compensate for the
imbalance of the gain resistors, add a correction resistor (RTS)
in series with RG in the lower loop. RTS is the Thevenin
equivalent of the source resistance, RS, and the termination
resistance, RT, and is equal to RS||RT.
RTS = RTH = RS||RT = 25.9
RS
50
VS
2V p-p
RT
53.6
RTH
25.9
VTH
1.03V p-p
07957-
052
Figure 58. Calculating the Thevenin Equivalent
Note that VTH is greater than 1 V p-p, which was obtained
with RT = 50 . The modified circuit with the Thevenin
equivalent (closest 1% value used for RTH) of the terminated
source and RTS in the lower feedback loop is shown in
ADA4950-x
RL VOUT, dm
+VS
–VS
RTH
25.5
RG
500
RG
500
RF
500
RF
500
VOCM
VTH
1.03V p-p
RTS
25.5
07957-
059
Figure 59. Thevenin Equivalent and Matched Gain Resistors
Figure 59 presents a tractable circuit with matched feedback
loops that can be easily evaluated.
It is useful to point out two effects that occur with a terminated
input. The first is that the value of RG is increased in both loops,
lowering the overall closed-loop gain. The second is that VTH is
a little larger than 1 V p-p, as it would be if RT = 50 . These two
effects have opposite impacts on the output voltage, and for
large resistor values in the feedback loops (~1 k), the effects
essentially cancel each other out. For small RF and RG, or high
gains, however, the diminished closed-loop gain is not canceled
completely by the increased VTH. This can be seen by evaluating
The desired differential output in this example is 1 V p-p
because the terminated input signal is 1 V p-p and the closed-
loop gain = 1. The actual differential output voltage, however, is
equal to (1.03 V p-p)(500/525.5) = 0.98 V p-p.
相關(guān)PDF資料
PDF描述
PEC07DBAN CONN HEADER .100 DUAL R/A 14POS
RMCF2512FT470R RES TF 470 OHM 1% 1W 2512
0388006.MXP FUSE 250V FA 3AG METI B 6A
PBC04SGBN CONN HEADER .100 SINGL R/A 4POS
PEC04SBEN CONN HEADER .100 SINGL R/A 4POS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4950-1YCPZ-RL 功能描述:IC AMP DIFF LP 114MA 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件
ADA4950-2 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-2YCP-EBZ 功能描述:BOARD EVAL FOR ADA4950-2YCP RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
ADA4950-2YCPZ-R2 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual 制造商:Analog Devices 功能描述:FIXED GAIN 1,2&3 DIFF ADC DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual }5.5V/11V 24-Pin LFCSP EP
ADA4950-2YCPZ-R7 功能描述:IC AMP DIFF DUAL 114MA 24LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*