Datasheet
11
LT1632/LT1633
sn1632 16323fs
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
5V Large-Signal Response
1632/33 G26
V
S
= 5V, 0V
A
V
= 1
R
L
= 1k
5V Small-Signal Response
163233 G25
V
S
= 5V, 0V
A
V
= 1
R
L
= 1k
Harmonic Distortion vs Frequency
FREQUENCY (kHz)
100
HARMONIC DISTORTION (dBc)
0
–20
–40
–60
–80
–100
1000 2000
1632/33 G29
200 500
V
S
= 5V, 0V
A
V
= 1
V
IN
= 2V
P-P
R
L
= 150Ω
R
L
= 1k
2ND
3RD
2ND
3RD
Harmonic Distortion vs Frequency
±15V Large-Signal Response
1632/33 G27
V
S
= ±15V
A
V
= 1
R
L
= 1k
±15V Small-Signal Response
FREQUENCY (kHz)
100
HARMONIC DISTORTION (dBc)
0
–20
–40
–60
–80
–100
1000 2000
1632/33 G30
1000
200 500
2ND
3RD
3RD
V
S
= 5V, 0V
A
V
= –1
V
IN
= 2V
P-P
R
L
= 150Ω
R
L
= 1k
2ND
1632/33 G28
V
S
= ±15V
A
V
= 1
R
L
= 1k
APPLICATIONS INFORMATION
WUU
U
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
CM
between the negative
supply to approximately 1.5V below the positive supply.
As V
CM
moves closer toward the positive supply, the
transistor Q5 will steer the tail current I
1
to the current
mirror Q6/Q7, activating the NPN differential pair and the
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