LM6142BIN National Semiconductor, LM6142BIN Datasheet - Page 11

• Manufacturer Part Number: LM6142BIN
• Description: IC, OP-AMP, 17MHZ, 25V/µS, DIP-8
• Manufacturer: National Semiconductor

Specifications of LM6142BIN

• Op Amp Type: General Purpose
• No. Of Amplifiers: 2
• Bandwidth: 17MHz
• Slew Rate: 25V/µs
• Supply Voltage Range: 1.8V To 24V
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LM6142/44 Application Ideas
These features allow the LM6142 to drive capacitive loads
as large as 1000 pF at unity gain and not oscillate. The
scope photos ( Figure 3 and Figure 4 ) above show the
LM6142 driving a l000 pF load. In Figure 3 , the upper trace
is with no capacitive load and the lower trace is with a 1000
pF load. Here we are operating on
Vp-p pulse. Excellent response is obtained with a C
In Figure 4 , the supplies have been reduced to
pulse is 4 Vp-p and C
pensation capacitor is best established after the board layout
is finished because the value is dependent on board stray
capacity, the value of the feedback resistor, the closed loop
gain and, to some extent, the supply voltage.
Another effect that is common to all opamps is the phase
shift caused by the feedback resistor and the input capaci-
tance. This phase shift also reduces phase margin. This ef-
fect is taken care of at the same time as the effect of the ca-
pacitive load when the capacitor is placed across the
feedback resistor.
The circuit shown in Figure 5 was used for these scope
photos.
f
is 39 pF. The best value for the com-
FIGURE 3.
±
12V supplies with a 20
DS012057-8
±
(Continued)
f
2.5V, the
of l0 pF.
FIGURE 2.
11
Typical Applications
FISH FINDER/ DEPTH SOUNDER.
The LM6142/44 is an excellent choice for battery operated
fish finders. The low supply current, high gain-bandwidth and
full rail to rail output swing of the LM6142 provides an ideal
combination for use in this and similar applications.
FIGURE 4.
FIGURE 5.
DS012057-6
DS012057-10
DS012057-9
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