LM6182AMN datasheet(20/24 Pages) NSC

20 / 24 page

Typical Applications (Continued)

The LM6182 crosstalk effect is minimized in applications that

cascade the amplifiers by preceding amplifier A with ampli-

fier B.

START-UP TIME

Using the circuit in

Figure 13, the LM6182 demonstrated a

start-up time of 50 ns.

OVERDRIVE RECOVERY

The LM6182 is an excellent choice for high speed applica-

tions needing fast overdrive recovery. Nanosecond recovery

times allow the LM6182 to protect subsequent stages from

excessive input saturation and possible damage.

When the output or input voltage range of a high speed am-

plifier is exceeded, the amplifier must recover from an over-

drive condition. The non-linear output voltage remains as

long as the overdrive condition persists. Linear operation re-

sumes after the overdrive condition is removed. Overdrive

recovery time is the delay before an amplifier returns to lin-

ear operation. The typical recovery times for exceeding open

loop, closed loop, and input commom-mode voltage ranges

are illustrated in

Figures 14, 15, 16.

The open-loop circuit of

Figure 14 generates an overdrive re-

sponse by allowing the ±0.5V input to exceed the linear in-

put range of the amplifier. Typical positive and negative over-

drive recovery times are 5 ns and 30 ns, respectively.

The large closed-loop gain configuration in

Figure 15 forces

the amplifier output into overdrive. The typical recovery time

to a linear output value is 15 ns.

DS011926-38

FIGURE 12. Crosstalk Rejection

DS011926-39

FIGURE 13. Start-Up Test Circuit

DS011926-41

DS011926-42

FIGURE 14. Open Loop Overdrive Recovery Times of

5 ns and 30 ns

DS011926-43

DS011926-44

FIGURE 15. 15 ns Closed Loop Output Overdrive

Recovery Time Generated by Saturating the Output

Stage of the LM6182

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