5

Schematic Diagram

Application Information

The HA-2544 is a true differential op amp that is as versatile

as any op amp but offers the advantages of high unity gain

bandwidth, high speed and low supply current. More

important than its general purpose applications is that the

HA-2544 was especially designed to meet the requirements

found in a video amplifier system. These requirements

include fine picture resolution and accurate color rendition,

and must meet broadcast quality standards.

In a video signal, the video information is carried in the

amplitude and phase as well as in the DC level. The amplifier

must pass the 30Hz line rate Iuminance level and the 3.58MHz

(NTSC) or 4.43MHz (PAL) color band without altering phase or

gain. The HA-2544’s key specifications aimed at meeting this

include high bandwidth (50MHz), very low gain flatness

(0.12dB at 10MHz), near unmeasurable differential gain and

differential phase (0.03% and 0.03 degrees), and low noise

(20nV/

√Hz). The HA-2544 meets these guidelines.

The HA-2544 also offers the advantage of a full output voltage

swing of

±10V into a 1kΩ load. This equates to a full power

bandwidth of 2.4MHz for this

±10V signal. If video signal

levels of

±2V maximum is used (with R

bandwidth would be 11.9MHz without clipping distortion.

V-

V+

BAL

BAL

5k

Ω

5k

Ω

V-

36

Ω

OUTPUT

36

Ω

V+

-INPUT

200

Ω

200

Ω

+INPUT

V-

V+

HA-2544