LM359MXSLASHNOPB datasheet(14/34 Pages) TI1

14 / 34 page

LM359

SNOSBT4C – MAY 1999 – REVISED MARCH 2013

www.ti.com

AN INVERTING VIDEO AMPLIFIER

1. Basic circuit configuration:

2. Determine the required ISET from the characteristic curves for gain bandwidth product.GBWMIN= 10 × 10 MHz

= 100 MHzFor a flat response to 10 MHz a closed loop response to two octaves above 10 MHz (40 MHz) will

be sufficient.

Actual GBW = 10 × 40 MHz = 400 MHz ISET required = 0.5 mA

3. Determine maximum value for Rf to provide stable DC biasing

Optimum

output DC level for maximum symmetrical swing without clipping is:

Rf(MAX)

can now be found:

This value should not be exceeded for predictable

DC biasing.

4. Select Rs to be large enough so as not to appreciably load the input termination resistance:Rs ≥ 750Ω; Let Rs

= 750

5. Select Rf for appropriate gain:

7.5 k

Ω is less than the calculated Rf(MAX) so DC

predictability is insured.

6. Since Rf = 7.5k, for the output to be biased to 5.1 VDC,

the reference current IIN(+) must be:

Now Rb can be found by:

7. Select Ci to provide the proper gain for the 8 Hz minimum input frequency:

A larger value of Ci will allow a flat frequency response down to 8 Hz and a

0.01

μF ceramic capacitor in parallel with Ci will maintain high frequency gain accuracy.

8. Test for peaking of the frequency response and add a feedback “lead” capacitor to compensate if necessary.

Submit Documentation Feedback

Product Folder Links: LM359

LM359MX/NOPB bảng dữ liệu(PDF) 14 Page - Texas Instruments