Datasheet

LT1057/LT1058
8
10578fd
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
Common Mode Range
vs Temperature
Common Mode and Power Supply
Rejections vs Temperature
Power Supply Rejection Ratio
vs Frequency
Supply Current
vs Temperature
Short-Circuit Current vs Time
(One Output Shorted to Ground)
The LT1057 may be inserted directly in LF353, LF412,
LF442, TL072, TL082 and OP-215 sockets. The LT1058
plugs into LF347, LF444, TL074 and TL084 sockets. Of
course, all standard dual and quad bipolar op amps can
also be replaced by these devices.
High Speed Operation
When the feedback around the op amp is resistive (R
F
)
a pole will be created with R
F
, the source resistance and
capacitance (R
S
, C
S
), and the amplifier input capacitance
(C
IN
≈ 4pF). In low closed loop gain configurations and
APPLICATIONS INFORMATION
with R
S
and R
F
in the kilohm range, this pole can create
excess phase shift and even oscillation. A small capaci-
tor (C
F
) in parallel with R
F
eliminates this problem. With
R
S
(C
S
+ C
IN
) = R
F
C
F
, the effect of the feedback pole is
completely removed.
OUTPUT
–
+
C
IN
R
F
R
S
C
F
C
S
10578 F01
FREQUENCY (Hz)
10
0
CMRR (dB)
20
40
60
80
120
100
1k 10k 100k
10578 G19
1M 10M
100
V
S
= ±15V
T
A
= 25°C
TEMPERATURE (°C)
–50
–15
COMMON MODE RANGE (V)
–14
–12
–11
±10
15
12
0
50
10578 G20
–13
13
14
11
100
V
S
= ±15V
TEMPERATURE (°C)
CMRR, PSRR (dB)
110
120
25 75
10578 G21
100
–25
125
PSRR
CMRR
90
V
S
= ±10V TO ±17V FOR PSRR
V
S
= ±15V, V
CM
= ±10.5V FOR CMRR
FREQUENCY (Hz)
10
140
120
100
80
60
40
20
0
10k 1M
10578 G22
100 1k
100k 10M
POWER SUPPLY REJECTION RATIO (dB)
T
A
= 25°C
POSITIVE
SUPPLY
NEGATIVE
SUPPLY
TEMPERATURE (°C)
–50
SUPPLY CURRENT PER AMPLIFIER (mA)
2
3
25 75
10578 G23
1
–25 0
50 100 125
0
V
S
= ±15V
V
S
= ±10V
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
0
–50
SHORT-CIRCUIT CURRENT (mA)
–40
–20
–10
0
50
20
1
2
10578 G24
–30
30
40
10
3
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
T
A
= 125°C
T
A
= 25°C
T
A
= –55°C
V
S
= ±15V