2007/10/15

AGAMEM MICROELECTRONICS INCOPERATION RESERVES THE RIGHT TO MAKE CHANGES WITHOUT

FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. AGAMEM

DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR

CIRCUIT DESRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE

RIGHTS OF OTHERS.

1

Agamem Microelectronics Inc.

AA8642

PRELIMINARY

Dual Video Amplifier with LPF

DESCRIPTION

AA8642 is a dual low pass filter video amplifier with 6db gain, 75

output buffer and

SAG correction. The 75

buffer is capable of driving two circuits. The SAG could

reduce the output coupling capacitor. It supports 3V and 5V operation voltage and

incorporates high performance 4-stage LPF which is ideal for removing DAC sampling

noise. The power saving circuit provides the power saving function. The IC is available

in 8-pin TSSOP (AA8642AP), 8-pin SOP (AA8642SP) and 8-pin DIP (AA8642PP)

package.

FEATURES

1.

Composite video driver with 6dB gain

2.

Support 3V and 5V operation voltage

3.

Built-in high performance 4-stage LPF

4.

Dual channels video amplifier

5.

SAG correction function

6.

A load sufficient for driving two circuits

7.

Low operating current, 18mA typical

8.

Internal voltage clamp circuit

9.

AC-Couple or DC-Couple output

AA8642 BLOCK DIAGRAM

Vcc

Vout2

Vsag2

Vout1

Vsag1

2

Vin2

Vin1

750

Ω

2.0K

750

Ω

2.2K

2.0K

6dB

Amp

75

Ω

Driver

5

6

8

LPF

6dB

Amp

75

Ω

Driver

4

3

1

7

2.2K

LPF

6.75MHZ

6.75MHZ

APPLICATION

VCR

Video Camera

TV

Video Player