LM6164JSLASH883 datasheet(8/12 Pages) NSC

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Simplified Schematic

Applications Tips

The LM6364 has been compensated for gains of 5 or greater

(over specified ranges of temperature, power supply voltage,

and load). Since this compensation involved adding

emitter-degeneration resistors in the op amp’s input stage,

the open-loop gain was reduced as the stability increased.

Gain error due to reduced A

VOL is most apparent at high

gains; thus, the uncompensated LM6365 is appropriate for

gains of 25 or more. If unity-gain operation is desired, the

LM6361 should be used. The LM6361, LM6364, and

LM6365 have the same high slew rate (typically 300 V/µs),

regardless of their compensation.

The LM6364 is unusually tolerant of capacitive loads. Most

op amps tend to oscillate when their load capacitance is

greater than about 200 pF (in low-gain circuits). However,

load capacitance on the LM6364 effectively increases its

compensation capacitance, thus slowing the op amp’s re-

sponse and reducing its bandwidth. The compensation is not

ideal, though, and ringing or oscillation may occur in

low-gain circuits with large capacitive loads. To overcompen-

sate the LM6364 for operation at gains less than 5, a series

resistor-capacitor network should be added between the in-

put pins (as shown in the Typical Applications, Noise Gain

Compensation) so that the high-frequency noise gain rises

to at least 5.

Power supply bypassing will improve the stability and tran-

sient response of the LM6364, and is recommended for ev-

ery design. 0.01 µF to 0.1 µF ceramic capacitors should be

used (from each supply “rail” to ground); if the device is far

away from its power supply source, an additional 2.2 µF to

10 µF (tantalum) may be required for extra noise reduction.

Keep all leads short to reduce stray capacitance and lead in-

ductance, and make sure ground paths are low-impedance,

especially where heavier currents will be flowing. Stray ca-

pacitance in the circuit layout can cause signal coupling be-

tween adjacent nodes, so that circuit gain unintentionally

varies with frequency.

Breadboarded circuits will work best if they are built using

generic PC boards with a good ground plane. If the op amps

are used with sockets, as opposed to being soldered into the

circuit, the additional input capacitance may degrade circuit

performance.

DS009153-3

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