參數(shù)資料
型號(hào)： ADA4939-1YCP-EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 0K
描述： BOARD EVAL FOR ADA4939-1YCP
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 1 - 單
放大器類型： 差分
板類型： 裸（未填充）
已供物品： 板
已用 IC / 零件： 16-LFCSP 封裝
ADA4939-1/ADA4939-2
Rev. 0 | Page 19 of 24
Mismatched feedback networks also result in a degradation of
the ability of the circuit to reject input common-mode signals,
much the same as for a four-resistor difference amplifier made
from a conventional op amp.
As a practical summarization of the above issues, resistors of 1%
tolerance produce a worst-case input CMRR of approximately
40 dB, a worst-case differential-mode output offset of 25 mV
due to a 2.5 V VOCM input, negligible VOCM noise contribution,
and no significant degradation in output balance error.
CALCULATING THE INPUT IMPEDANCE FOR AN
APPLICATION CIRCUIT
The effective input impedance of a circuit depends on whether
the amplifier is being driven by a single-ended or differential
signal source. For balanced differential input signals, as shown
in Figure 44, the input impedance (RIN, dm) between the inputs
(+DIN and DIN) is simply RIN, dm = 2 × RG.
+VS
ADA4939
+IN
–IN
RF
+DIN
–DIN
VOCM
RG
VOUT, dm
07
42
9-
0
51
Figure 44. ADA4939 Configured for Balanced (Differential) Inputs
For an unbalanced, single-ended input signal (see Figure 45),
the input impedance is
()
+
×
=
F
G
F
G
SE
IN
R
2
1
,
ADA4939
RL VOUT, dm
+VS
–VS
RG
RF
VOCM
RIN, SE
07
42
9-
0
52
Figure 45. ADA4939 with Unbalanced (Single-Ended) Input
The input impedance of the circuit is effectively higher than it
would be for a conventional op amp connected as an inverter
because a fraction of the differential output voltage appears at
the inputs as a common-mode signal, partially bootstrapping
the voltage across the input resistor RG. The common-mode
voltage at the amplifier input terminals can be easily determined by
noting that the voltage at the inverting input is equal to the
noninverting output voltage divided down by the voltage divider
formed by RF and RG in the lower loop. This voltage is present at
both input terminals due to negative voltage feedback and is in
phase with the input signal, thus reducing the effective voltage
across RG in the upper loop and partially bootstrapping RG.
Terminating a Single-Ended Input
This section deals with how to properly terminate a single-
ended input to the ADA4939 with a gain of 2, RF = 400 Ω, and
RG = 200 Ω. An example using an input source with a terminated
output voltage of 1 V p-p and source resistance of 50 Ω illustrates
the four simple 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 46 indicates this open-circuit voltage.
1.
The input impedance must be calculated using the formula
Ω
300
)
400
200
(
2
400
1
200
)
(
2
1
=
+
×
=
+
×
=
F
G
F
G
IN
R
RS
50
VS
2V p-p
RIN
300
ADA4939
RL VOUT, dm
+VS
–VS
RG
200
RG
200
RF
400
RF
400
VOCM
074
29
-05
3
Figure 46. Calculating Single-Ended Input Impedance RIN
相關(guān)PDF資料
PDF描述
4-1589788-9 WDUALOBE CONNECTOR
VE-J4T-EY CONVERTER MOD DC/DC 6.5V 50W
VE-J4R-EY CONVERTER MOD DC/DC 7.5V 50W
VI-24R-EY CONVERTER MOD DC/DC 7.5V 50W
GCC08DRYN-S734 CONN EDGECARD 16POS DIP .100 SLD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4939-1YCPZ-R2 制造商:Analog Devices 功能描述:SP Amp Differential ADC Driver Single 5.25V 16-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:SP AMP DIFFERENTIAL ADC DRVR SGL 5.25V 16LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp Differential ADC Driver Single 5.25V 16-Pin LFCSP EP Tape & Reel
ADA4939-1YCPZ-R7 功能描述:IC AMP DIFF ULDIST LN 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:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 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:-40°C ~ 85°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
ADA4939-1YCPZ-RL 功能描述:IC AMP DIFF ULDIST LN 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:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 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:-40°C ~ 85°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
ADA4939-2 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Distortion Differential ADC Driver
ADA4939-2YCP-EBZ 功能描述:BOARD EVAL FOR ADA4939-2YCP 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:-
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

*
*
*