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PDF ( 数据手册 , 数据表 ) AD813

零件编号 AD813
描述 Low Power Triple Video Amplifier
制造商 Analog Devices
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AD813 数据手册, 描述, 功能
a
Single Supply, Low Power
Triple Video Amplifier
AD813
FEATURES
Low Cost
Three Video Amplifiers in One Package
Optimized for Driving Cables in Video Systems
Excellent Video Specifications (RL = 150 )
Gain Flatness 0.1 dB to 50 MHz
0.03% Differential Gain Error
0.06؇ Differential Phase Error
Low Power
Operates on Single +3 V to ؎15 V Power Supplies
5.5 mA/Amplifier Max Power Supply Current
High Speed
125 MHz Unity Gain Bandwidth (–3 dB)
500 V/s Slew Rate
High Speed Disable Function per Channel
Turn-Off Time 80 ns
Easy to Use
50 mA Output Current
Output Swing to 1 V of Rails
APPLICATIONS
Video Line Driver
LCD Drivers
Computer Video Plug-In Boards
Ultrasound
RGB Amplifier
CCD Based Systems
PRODUCT DESCRIPTION
The AD813 is a low power, single supply triple video amplifier.
Each of the three current feedback amplifiers has 50 mA of output
current, and is optimized for driving one back-terminated video
load (150 ). The AD813 features gain flatness of 0.1 dB to
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
G = +2
RL = 150
؎15V
؎5V
3V
5V
100k
1M 10M
FREQUENCY – Hz
100M
Figure 1. Fine Scale Gain Flatness vs. Frequency,
G = +2, RL = 150
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PIN CONFIGURATION
14-Lead DIP and SOIC
DISABLE1 1
DISABLE2 2
DISABLE3 3
VS+ 4
+IN1 5
–IN1 6
OUT1 7
AD813
14 OUT2
13 –IN2
12 +IN2
11 VS
10 +IN3
9 –IN3
8 OUT3
50 MHz while offering differential gain and phase error of
0.03% and 0.06°. This makes the AD813 ideal for broadcast
and consumer video electronics.
The AD813 offers low power of 5.5 mA per amplifier max and
runs on a single +3 V power supply. The outputs of each ampli-
fier swing to within one volt of either supply rail to easily accom-
modate video signals. While operating on a single +5 V supply
the AD813 still achieves 0.1 dB flatness to 20 MHz and 0.05%
& 0.05° of differential gain and phase performance. All this is
offered in a small 14-lead plastic DIP or SOIC package. These
features make this triple amplifier ideal for portable and battery
powered applications where size and power are critical.
The outstanding bandwidth of 125 MHz along with 500 V/µs of
slew rate make the AD813 useful in many general purpose, high
speed applications where a single +3 V or dual power supplies
up to ± 15 V are needed. Furthermore the AD813 contains a
high speed disable function for each amplifier in order to power
down the amplifier or high impedance the output. This can then
be used in video multiplexing applications. The AD813 is avail-
able in the industrial temperature range of –40°C to +85°C in
plastic DIP and SOIC packages as well as chips.
500mV
100
90
500ns
10
0%
5V
Figure 2. Channel Switching Characteristics for a 3:1 Mux
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998







AD813 pdf, 数据表
20
15
10
5
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎Volts
Figure 4. Input Common-Mode Voltage Range vs.
Supply Voltage
20
15
NO LOAD
10
RL = 150
5
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎Volts
Figure 5. Output Voltage Swing vs. Supply Voltage
30
؎15V SUPPLY
25
20
15
10
؎5V SUPPLY
5
0
10
100 1k
LOAD RESISTANCE –
10k
Figure 6. Output Voltage Swing vs. Load Resistance
AD813
20
18
VS = ؎15V
16
14
VS = ؎5V
12
10
8
–60 –40
–20 0 20 40 60 80 100
JUNCTION TEMPERATURE – C
120 140
Figure 7. Supply Current vs. Junction Temperature
13
TA = +25 C
12
11
10
9
8
0 2 4 6 8 10 12 14 16
SUPPLY VOLTAGE – ±Volts
Figure 8 Supply Current vs. Supply Voltage at Low
Voltages
25
20
15
10
–IB, VS = ؎5V
5
0 +IB, VS = ؎5V, ؎15V
–5
–10 –IB, VS = ؎15V
–15
–20
–25
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE – C
Figure 9. Input Bias Current vs. Junction Temperature
REV. B
–7–







AD813 equivalent, schematic
VS = ؎5V
G = +2
RF = 750
RL = 1k
CL = 10pF
9 RS = 0
6
3 RS = 30
0
–3 RS = 50
1 10 100 1000
FREQUENCY – MHz
Figure 42. Response to a Small Load Capacitor at
VS = ±5 V
VS = ؎15V
G = +2
RF = 750
RL = 1k
9
6
CL = 150pF, RS = 30
3
0
CL = 510pF, RS = 15
–3
1 10 100 1000
FREQUENCY – MHz
Figure 43. Response to a Large Load Capacitor at
VS = ±15 V
100 100
90
5V
1 00 n s
AD813
Overload Recovery
There are three important overload conditions to consider.
They are due to: input common-mode voltage overdrive, out-
put voltage overdrive, and input current overdrive. When the
amplifier is configured for low closed-loop gains, and the input
common-mode voltage range is exceeded, the recovery time will
be very fast, typically under 30 ns. When configured for a
higher gain, and overloaded at the output, the recovery time will
also be short. For example, in a gain of +10, with 6 dB of
input overdrive, the recovery time of the AD813 is about 25 ns
(see Figure 45).
1V
100
90
50ns
10
0%
2V
Figure 45. 6 dB Overload Recovery, G = +10,
(RL = 500 , RF = 357 , VS = ±5 V)
In the case of high gains with very high levels of input overdrive,
a longer recovery time will occur. For example, if the input
common-mode voltage range is exceeded in the gain of +10, the
recovery time will be on the order of 100 ns. This is primarily
due to current overloading of the input stage.
As noted in the warning under Maximum Power Dissipation, a
high level of input overdrive in a high noninverting gain circuit
can result in a large current flow in the input stage. Though this
current is internally limited to about 40 mA, its effect on the
total power dissipation may be significant.
10
0%
5V
Figure 44. Circuit of Figure 38 Driving a 510 pF Load
Capacitor, VS = ±15 V (RL = 1 k, RF = RG = 750 ,
RS =15 )
REV. B
–15–










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