LT1632 LINER [Linear Technology], LT1632 Datasheet - Page 11

• Manufacturer Part Number: LT1632
• Description: 45MHz, 45V/us, Dual/Quad Rail-to-Rail Input and Output Precision Op Amps
• Manufacturer: LINER [Linear Technology]

APPLICATIONS
TYPICAL PERFORMANCE CHARACTERISTICS
Rail-to-Rail Input and Output
The LT1632/LT1633 are fully functional for an input and
output signal range from the negative supply to the posi-
tive supply. 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
that are active over different ranges of input common
mode voltage. The PNP differential input pair is active for
input common mode voltages V
supply to approximately 1.5V below the positive supply.
As V
transistor Q5 will steer the tail current I
mirror Q6/Q7, activating the NPN differential pair and the
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
100
100
Harmonic Distortion vs Frequency
CM
Harmonic Distortion vs Frequency
V
A
V
V
A
V
S
V
IN
S
V
IN
= 5V, 0V
= 1
= 5V, 0V
= –1
= 2V
R
= 2V
R
R
R
moves closer toward the positive supply, the
L
L
L
L
= 150
= 1k
200
= 150
= 1k
200
P-P
P-P
3RD
FREQUENCY (kHz)
FREQUENCY (kHz)
2ND
U
500
500
3RD
3RD
2ND
INFORMATION
2ND
U
1000
1000
3RD
W
2ND
CM
1632/33 G29
1632/33 G30
2000
2000
U
1000
W
between the negative
1
to the current
5V Small-Signal Response
V
A
R
V
A
R
S
V
L
S
V
U
L
15V Small-Signal Response
= 5V, 0V
= 1
= 1k
= 1k
= 15V
= 1
PNP pair becomes inactive for the rest of the input com-
mon mode range up to the positive supply.
The output is configured with a pair of complementary
common emitter stages Q14/Q15 that enables the output
to swing from rail to rail. These devices are fabricated on
Linear Technology’s proprietary complementary bipolar
process to ensure similar DC and AC characteristics.
Capacitors C1 and C2 form local feedback loops that lower
the output impedance at high frequencies.
Power Dissipation
The LT1632/LT1633 amplifiers combine high speed and
large output current drive in a small package. Because the
163233 G25
1632/33 G27
V
A
R
V
A
R
5V Large-Signal Response
S
V
S
V
L
L
15V Large-Signal Response
= 5V, 0V
= 1
= 1k
= 15V
= 1
= 1k
LT1632/LT1633
11
1632/33 G26
1632/33 G28