LT1677CS8 Ver la hoja de datos (PDF) - Linear Technology
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LT1677CS8 Datasheet PDF : 16 Pages
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LT1677
APPLICATIO S I FOR ATIO
General
The LT1677 series devices may be inserted directly into
OP-07, OP-27, OP-37 and sockets with or without removal
of external compensation or nulling components. In addi-
tion, the LT1677 may be fitted to 741 sockets with the
removal or modification of external nulling components.
INPUT
10k
1
2– 8
76
LT1677
3+
4
15V
OUTPUT
Rail-to-Rail Operation
To take full advantage of an input range that can exceed
the supply, the LT1677 is designed to eliminate phase
reversal. Referring to the photographs shown in Figure 1,
the LT1677 is operating in the follower mode (AV = +1) at
a single 3V supply. The output of the LT1677 clips cleanly
and recovers with no phase reversal. This has the benefit
of preventing lock-up in servo systems and minimizing
distortion components.
–15V
1677 F02
Figure 2. Standard Adjustment
The adjustment range with a 10kΩ pot is approximately
±2.5mV. If less adjustment range is needed, the sensitiv-
ity and resolution of the nulling can be improved by using
a smaller pot in conjunction with fixed resistors. The
example has an approximate null range of ±200µV
(Figure 3).
Offset Voltage Adjustment
The input offset voltage of the LT1677 and its drift with
temperature are permanently trimmed at wafer
testing to a low level. However, if further adjustment of
VOS is necessary, the use of a 10kΩ nulling potentiometer
will not degrade drift with temperature. Trimming to a
value other than zero creates a drift of (VOS/ 300)µV/°C,
e.g., if VOS is adjusted to 300µV, the change in drift will be
1µV/°C (Figure 2).
1k
15V
4.7k
4.7k
1
2– 8
LT1677
76
3+
4
OUTPUT
–15V
1677 F03
Figure 3. Improved Sensitivity Adjustment
Input = – 0.5V to 3.5V
LT1677 Output
3V
3V
2V
2V
1V
1V
0V
– 0.5V
1577 F01a
0V
– 0.5V
1577 F01b
Figure 1. Voltage Follower with Input Exceeding the Supply Voltage (VS = 3V)
9
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