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Low Cost, Dual/Triple Video Amplifiers AD8072/AD8073

FEATURES Very Low Cost Good Video Specifications (RL = 150 ⍀) Gain Flatness of 0.1 dB to 10 MHz 0.05% Differential Gain Error 0.1؇ Differential Phase Error Low Power 3.5 mA/Amplifier Supply Current Operates on Single +5 V to +12 V Supply High Speed 100 MHz, –3 dB Bandwidth (G = +2) 500 V/␮s Slew Rate Fast Settling Time of 25 ns (0.1%) Easy to Use 30 mA Output Current Output Swing to 1.3 V of Rails on Single +5 V Supply

FUNCTIONAL BLOCK DIAGRAM

OUT1

8

+VS

–IN1

2

7

OUT2

+IN1

3

6

–IN2

–VS

4

5

+IN2

NC

1

14 OUT2

NC

2

13 –IN2

NC

3

12 +IN2

+VS

4

+IN1

5

10 +IN3

–IN1

6

9 –IN3

OUT1

APPLICATIONS Video Line Driver Computer Video Plug-In Boards RGB or S-Video Amplifier in Component Systems

1

7

8

PRODUCT DESCRIPTION

Both will operate from a single +5 V to +12 V power supply. The outputs of each amplifier swing to within 1.3 volts of either supply rail to accommodate video signals on a single +5 V supply. The high bandwidth of 100 MHz, 500 V/µs of slew rate, along with settling to 0.1% in 25 ns, make the AD8072 and AD8073 useful in many general purpose, high speed applications where a single +5 V or dual power supplies up to ± 6 V are needed. The AD8072 is available in 8-pin plastic DIP and SOIC packages

11 –VS

OUT3

while the AD8073 is available in 14-pin plastic DIP and SOIC packages. Both operate over the commercial temperature range of 0°C to +70°C. 6.1

7

6.0

6

5.9

5

5.8

4

5.7 5.6 5.5

VS = ±5V VO = 2V p RF = RG = 1kΩ RL = 150Ω AV = +2

3 1 dB DIV

2

0.1 dB DIV

1 0

5.4 5.3 0.1

CLOSED-LOOP GAIN – dB

These devices provide 30 mA of output current per amplifier, and are optimized for driving one back terminated video load (150 Ω) each. These current feedback amplifiers feature gain flatness of 0.1 dB to 10 MHz while offering differential gain and phase error of 0.05% and 0.1°. This makes the AD8072 and AD8073 ideal for business and consumer video electronics.

AD8073 AD8072

NC = NO CONNECT

GAIN FLATNESS – dB

The AD8072 (dual) and AD8073 (triple) are low cost, current feedback amplifiers intended for high volume, cost sensitive applications. In addition to being low cost, these amplifiers deliver solid video performance into a 150 Ω load while consuming only 3.5 mA per amplifier of supply current. Furthermore, the AD8073 is three amplifiers in a single 14-pin narrow-body SOIC package. This makes it ideal for applications where small size is essential. Each amplifier’s inputs and output are accessible providing added gain setting flexibility.

AD8072

1

10 FREQUENCY – MHz

100

–1 500

Figure 1. Large Signal Frequency Response

REV. 0 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.

© Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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