LM6152, LM6154

SNOS752E – MAY 1999 – REVISED SEPTEMBER 2014

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7 Application and Implementation

The LM6152/LM6154 is ideally suited for operation with about 10 k

Ω (Feedback Resistor, RF) between the output

and the negative input terminal.

With RF set to this value, for most applications requiring a close loop gain of 10 or less, an additional small

compensation capacitor (CF) (see Figure 26) is recommended across RF in order to achieve a reasonable

overshoot (10%) at the output by compensating for stray capacitance across the inputs.

The optimum value for CF can best be established experimentally with a trimmer cap in place since its value is

dependant on the supply voltage, output driving load, and the operating gain. Below, some typical values used in

an inverting configuration and driving a 10 k

Ω load have been tabulated for reference:

Table 1. Typical BW (

−3 dB) at Various

Supply Voltage and Gains

VS

CF

BW (

−3 dB)

GAIN

Volts

pF

MHz

−1

5.6

4

3

−10

6.8

1.97

−100

None

0.797

−1

2.2

6.6

24

−10

4.7

2.2

−100

None

0.962

In the non-inverting configuration, the LM6152/LM6154 can be used for closed loop gains of +2 and above. In

this case, also, the compensation capacitor (CF) is recommended across RF (= 10 kΩ) for gains of 10 or less.

Figure 26. Typical Inverting Gain Circuit AV = −1

Because of the unique structure of this amplifier, when used at low closed loop gains, the realizable BW will be

much less than the GBW product would suggest.

The LM6152/LM6154 brings a new level of ease of use to op amp system design.

The greater than rail-to-rail input voltage range eliminates concern over exceeding the common-mode voltage

range. The rail-to-rail output swing provides the maximum possible dynamic range at the output. This is

particularly important when operating on low supply voltages.

The high gain-bandwidth with low supply current opens new battery powered applications where higher power

consumption previously reduced battery life to unacceptable levels.

The ability to drive large capacitive loads without oscillating functional removes this common problem.

To take advantage of these features, some ideas should be kept in mind.

The LM6152/LM6154, capacitive loads do not lead to oscillations, in all but the most extreme conditions, but they

will result in reduced bandwidth. They also cause increased settling time.

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