a
FEATURES
Low Cost
Three Video Amplifiers in One Package
Optimized for Driving Cables in Video Systems
Excellent Video Specifications (R
L
= 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
Single Supply, Low Power
Triple Video Amplifier
AD813
PIN CONFIGURATION
14-Lead DIP and SOIC
DISABLE1
1
DISABLE2
DISABLE3
2
3
14 OUT2
13 –IN2
12 +IN2
V
S
+ 4
+IN1 5
–IN1 6
OUT1 7
AD813
11 V
S
–
10 +IN3
9
8
–IN3
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
500ns
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
Ω).
The AD813 features gain flatness of 0.1 dB to
G = +2
R
L
= 150
0.2
NORMALIZED GAIN – dB
15V
0.1
100
0
–0.1
5V
–0.2
–0.3
–0.4
–0.5
3V
5V
90
10
0%
100k
1M
10M
100M
5V
FREQUENCY – Hz
Figure 1. Fine Scale Gain Flatness vs. Frequency,
G = +2, R
L
= 150
Ω
Figure 2. Channel Switching Characteristics for a 3:1 Mux
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.
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
Model
Conditions
MATCHING CHARACTERISTICS
Dynamic
Crosstalk
Gain Flatness Match
DC
Input Offset Voltage
–Input Bias Current
POWER SUPPLY
Operating Range
Quiescent Current
V
S
Min
AD813A
Typ
Max
Units
G = +2, f = 5 MHz
G = +2, f = 20 MHz
T
MIN
–T
MAX
T
MIN
–T
MAX
+5 V, +3 V
+5 V, +3 V
+5 V, +3 V
+5 V, +3 V
2.4
–65
0.1
0.5
2
3.5
25
36
4.0
4.0
5.0
0.6
0.5
dB
dB
mV
µA
V
mA
mA
mA
mA
mA
dB
µA/V
µA/V
dB
pF
dB
ns
ns
Per Amplifier
T
MIN
–T
MAX
Per Amplifier
Quiescent Current, Powered Down
Power Supply Rejection Ratio
Input Offset Voltage
–Input Current
+Input Current
DISABLE CHARACTERISTICS
Off Isolation
Off Output Impedance
Channel-to-Channel
Isolation
Turn-On Time
Turn-Off Time
TRANSISTOR COUNT
+5 V
+3 V
+5 V
+5 V
+3 V
3.2
3.0
0.4
0.4
76
0.3
0.005
V
S
= +3.0 V to +30 V
f = 5 MHz
G = +1
2 or 3 Channel
Mux, f = 5 MHz
+5 V, +3 V
+5 V, +3 V
+5 V, +3 V
+5 V, +3 V
–55
13
–65
100
80
111
NOTES
1
Slew rate measurement is based on 10% to 90% rise time in the specified closed-loop gain.
2
Single supply differential gain and phase are measured with the ac coupled circuit of Figure 52.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Watts
Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 Watts
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . .
±
V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .
±
6 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Storage Temperature Range N, R . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD813A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . +300°C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Specification is for device in free air:
14-Lead Plastic DIP Package:
θ
JA
= 75°C/W
14-Lead SOIC Package:
θ
JA
= 120°C/W
ORDERING GUIDE
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
Description
Package
Options
Model
AD813AN
AD813AR-14
AD813ACHIPS
AD813AR-REEL
AD813AR-REEL7
5962-9559601M2A*
14-Lead Plastic DIP N-14
14-Lead Plastic SOIC R-14
Die Form
13" REEL
7" REEL
–55°C to +125°C 20-Lead LCC
*Refer to official DSCC drawing for tested specifications and pin configuration.
REV. B
–5–
嵌入式系统
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