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參數資料
| 型號： | AD8044 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad 150 MHz Rail-to-Rail Amplifier |
| 中文描述： | 四路150 MHz的軌到軌放大器 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 199K |
| 代理商： | AD8044 |
AD8044
REV. A
–12–
A
CL
– V/V
1000
100
101
6
2
C
3
4
5
V
S
= +5V
< 30% OVERSHOOT
R
G
R
F
C
L
R
S
V
OUT
V
IN
100mV STEP
R
S
= 10
V
R
S
= 0
V
Figure 35. Capacitive Load Drive vs. Closed-Loop Gain
APPLICATIONS
RGB Buffer
The AD8044 can provide buffering of RGB signals that include
ground while operating from a single +3 V or +5 V supply.
When driving two monitors from the same RGB video source it
is necessary to provide an additional driver for one of the moni-
tors to prevent the double termination situation that the second
monitor presents. This has usually required a dual supply op
amp because the level of the input signal from the video driver
goes all the way to ground during horizontal blanking. In single
supply systems it can be a major inconvenience and expense to
add an additional negative supply.
A single AD8044 can provide the necessary drive capability and
yet does not require a negative supply in this application. Fig-
ure 36 is a schematic that uses three amplifiers out of a single
AD8044 to provide buffering for a second monitor.
The source of the RGB signals is shown to be from a set of three
current output DACs that are within a single supply graphics
IC. This is typically the situation in most PCs and workstations
which might use either a stand-alone triple DAC or DACs that
are integrated into a larger graphics chip.
During horizontal blanking, the current output from the DACs
is turned off and the RGB outputs are pulled to ground by the
termination resistors. If voltage sources were used for the RGB
signals, then the termination resistors near the graphics IC
would be in series and the rest of the circuit would remain the
same. This is because a voltage source is an ac short circuit, so a
series resistor is required to make the drive end of the line see
75
to ac ground. On the other hand, a current source has a
very high output impedance, so a shunt resistor is required to
make the drive end of the line see 75
to ground. In either
case, the monitor terminates its end of the line with 75
.
The circuit of Figure 36 shows minimum signal degradation
when using a single supply for the AD8044. The circuit per-
forms equally well on either a +3 V or +5 V supply.
A
1k
V
10
m
F
+3V OR +5V
75
V
0.1
m
F
1k
V
75
V
RGB
MONITOR #2
V+
B
1k
V
75
V
1k
V
C
1k
V
75
V
1k
V
V–
75
V
75
V
75
V
75
V
75
V
RGB
MONITOR #1
75
V
75
V
75
V
R
G
B
+5V
GRAPHICS
IC
AD8044
AD8044
AD8044
Figure 36. Single Supply RGB Video Driver
Figure 37 is an oscilloscope photo of the circuit in Figure 36
operating from a +3 V supply and driven by the Blue signal of a
color bar pattern. Note that the input and output are at ground
during the horizontal blanking interval. The RGB signals are
specified to output a maximum of 700 mV peak. The output of
the AD8044 is 1.4 V with the termination resistors providing a
divide-by-two.
V
IN
GND
GND
V
OUT
10
0%
100
90
5
m
s
500mV
500mV
Figure 37. +3 V, RGB Buffer
相關PDF資料 |
PDF描述 |
|---|---|
| AD8044AN | Quad 150 MHz Rail-to-Rail Amplifier |
| AD8044AR-14 | Quad 150 MHz Rail-to-Rail Amplifier |
| AD8044AR-14-REEL | VARISTOR 14VRMS 14MM RADIAL |
| AD8044AR-14-REEL7 | VARISTOR 150V RMS 14MM RADIAL |
| AD8045 | 3 nV/Hz Ultralow Distortion, High Speed Op Amp |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8044_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad 150 MHz Rail-to-Rail Amplifier |
| AD8044AN | 制造商:Analog Devices 功能描述:OP Amp Quad Volt Fdbk R-R O/P ±6V/12V 14-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:QUAD 180MHZ R-TO-R V-FDBK - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR |
| AD8044ANZ | 功能描述:IC OPAMP VF R-R QUAD LP 14DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率: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） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8044AR | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad 150 MHz Rail-to-Rail Amplifier |
| AD8044AR14 | 制造商:Analog Devices 功能描述: |
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