LT1218 データシートの表示（PDF） - Linear Technology
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LT1218 Datasheet PDF : 16 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
THD + Noise vs
Peak-to-Peak Voltage
10
f = 1kHz
RL = 10k
(ALL CURVES)
1
Small-Signal Response
VS = ±15V
0.1
0.01
0.001
0
VS = ±1.5V VS = ±1.5V
AV = –1
AV = 1
VS = ±2.5V
AV = 1
VS = ±2.5V
AV = –1
1
2
3
4
5
INPUT VOLTAGE (PEAK-TO-PEAK)
LT1218/19 • TPC26
AV = 1
VS = ±15V
LT1218/18 • TPC27
LT1218/LT1219
Large-Signal Response
VS = ±15V
AV = 1
VS = ±15V
LT1218/18 • TPC28
APPLICATIONS INFORMATION
Rail-to-Rail Operation
The LT1218/LT1219 differ from conventional op amps in
the design of both the input and output stages. Figure 1
shows a simplified schematic of the amplifier. The input
stage consists of two differential amplifiers, a PNP stage
Q1/Q2 and an NPN stage Q3/Q4, which are active over
different portions of the input common mode range.
Lateral devices are used in both input stages, eliminating
the need for clamps across the input pins. Each input stage
is trimmed for offset voltage. A complementary output
configuration (Q23 through Q26) is employed to create an
TRIM
V+
BIAS
CONTROL
SHDN
I1
Q5
Q10
Q11
D4
D5
V–
Q16
IN+
IN –
Q12
V+
– 300mV
V–
Q3 Q4
Q6
V–
D1
Q1 Q2
D3
V+
D2
Q7
Q8 Q9
V+
CC
Q14 Q15
Q13
Q18
D7
Figure 1. LT1218 Simplified Schematic Diagram
D6
Q17
Q21
V–
V+
Q20
Q22
Q19
D7
Q24
Q23
V–
C1
OUT
C2
V+
Q25
Q26
D8
LT1218/19 • F01
11
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