- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄8585 > AD8141ACPZ-R7 (Analog Devices Inc)IC AMP VIDEO TRIPLE DR 24-LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD8141ACPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VIDEO TRIPLE DR 24-LFCSP |
| 標準包裝： | 1 |
| 應(yīng)用： | 驅(qū)動器 |
| 輸出類型： | 差分 |
| 電路數(shù)： | 3 |
| -3db帶寬： | 275MHz |
| 轉(zhuǎn)換速率： | 1150 V/µs |
| 電流 - 電源： | 44mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V，±2.25 V ~ 2.75 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 24-LFCSP-WQ（4x4） |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8141ACPZ-R7DKR |
AD8141/AD8142
Data Sheet
Rev. A | Page 16 of 24
INPUT COMMON-MODE VOLTAGE RANGE IN
SINGLE-SUPPLY APPLICATIONS
The driver inputs are designed to facilitate level-shifting of ground
referenced input signals on a single power supply. For a single-
ended input, this implies, for example, that the voltage at VIN in
Figure 36 is 0 V when the amplifier’s negative power supply
voltage is also set to 0 V.
It is important to ensure that the common-mode voltage at the
amplifier inputs, VAP and VAN, stays within its specified range.
Because the VAP and VAN voltages are driven to be essentially
equal by negative feedback, the amplifier’s input common-mode
voltage can be expressed as a single term, VACM. VACM can be
calculated as
3
2 ICM
OCM
ACM
V
+
=
where VICM is the common-mode voltage of the input signal,
that is,
2
IN
IP
ICM
V
+
=
TERMINATING A SINGLE-ENDED INPUT
Each driver has a nominal fixed gain of 2, with RF = 2.0 k and
RG = 1.0 k. A typical single-ended video signal source applied to
the AD8141/AD8142 input has a maximum terminated output
voltage of 0.7 V p-p and source resistance of 75 . Because the
terminated output voltage of the source is 0.7 V p-p, the open-
circuit output voltage of the source is 1.4 V p-p. The source shown
in Figure 37 indicates this open-circuit voltage. The following
three steps illustrate how to terminate a signal from a typical
single-ended 75 video source.
1. The single-ended input impedance is calculated as
RIN = 1.5 k.
AD8141/
AD8142
RL
+5V
VOUT, dm
+
–
VIDEO SOURCE
RIN
1.5k
09461-
035
RG
1k
RF
2k
RF
2k
RG
1k
RS
75
VS
1.4V p-p
Figure 37. Calculating Single-Ended Input Impedance, RIN
2. To match the 75 source resistance, the termination resistor,
RT, is calculated using RT||1.125 k = 75 . The closest
standard 1% value for RT is 80.6 .
AD8141/
AD8142
RL
+VS
–VS
VOUT, dm
+
–
RIN
75
09461-
036
RT
80.6
RG
1k
RG
1k
RS
75
RF
2k
RF
2k
VS
1.4V p-p
Figure 38. Adding Termination Resistor RT
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, a
correction resistor (RTS) is added in series with RG in the
lower loop. RTS is the closest 1% resistor to the Thevenin
equivalent of the source resistance RS and the termination
resistance RT, equal to RS||RT.
09461-
037
RT
80.6
RS
75
RTH
38.8
VTH
0.725V p-p
VS
1.4V p-p
Figure 39. Calculating the Thevenin Equivalent
RTH = RS||RT = 38.8 , and RTS = 38.3 . Note that VTH is
greater than 0.7 V p-p, which was obtained with RT = 75
alone. The modified circuit with the Thevenin equivalent of
the terminated source and RTS in the lower feedback loop is
shown in Figure 40.
AD8141/
AD8142
RL
+VS
–VS
VOUT, dm
+
–
09461-
038
RTS
38.3
RF
2k
RG
1k
RG
1k
RTH
38.8
RF
2k
VTH
0.725V p-p
Figure 40. Thevenin Equivalent and Matched Gain Resistors
Figure 40 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 0.7 V p-p, as it is if RT = 75 alone. These
two effects have opposite impacts on the output voltage, and for
large resistor values in the feedback loops, the effects essentially
cancel each other out. For smaller RF and RG, however, the
diminished closed-loop gain is not canceled completely by the
increased VTH.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD565AJRZ-REEL | IC DAC 12BIT MONO 250NS 28SOIC |
| LT6551CMS#PBF | IC AMP VIDEO QUAD 3.3V 10-MSOP |
| LTC1597BIG#PBF | IC D/A CONV 16BIT PAR 28-SSOP |
| AD830JRZ-R7 | IC VIDEO DIFF AMP HS 8-SOIC T/R |
| LTC1597BIG | IC D/A CONV 16BIT PAR 28-SSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8141ACPZ-R7_PROMO | 制造商:Analog Devices 功能描述:IC ADC VIDEO AMP LFCSP-24 |
| AD8141ACPZ-RL | 功能描述:IC VIDEO AMP TRPL DIFF 24LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標準包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| AD8142 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, Triple Differential Drivers |
| AD8142ACPZ-R2 | 制造商:Analog Devices 功能描述:Video Amp Triple 5.5V 24-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:LOW COST CAT5 DRIVER - Tape and Reel |
| AD8142ACPZ-R7 | 功能描述:IC AMP VIDEO TRIPLE DR 24-LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 應(yīng)用:TFT-LCD 面板：VCOM 驅(qū)動器 輸出類型:滿擺幅 電路數(shù):1 -3db帶寬:35MHz 轉(zhuǎn)換速率:40 V/µs 電流 - 電源:3.7mA 電流 - 輸出 / 通道:1.3A 電壓 - 電源，單路/雙路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:8-uMax-EP 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。