LT1057_15 Datasheet, PDF (8/16 Pages) Linear Technology – Dual and Quad, JFET Input Precision High Speed Op Amps

LT1057/LT1058
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
120
V_S = ±15V
T_A = 25°C
100
80
60
40
20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
10578 G19
Power Supply Rejection Ratio
vs Frequency
140
T_A = 25°C
120
100
80
60
NEGATIVE
SUPPLY
40
POSITIVE
SUPPLY
20
0
10 100
1k 10k 100k
FREQUENCY (Hz)
1M 10M
10578 G22
Common Mode Range
vs Temperature
15
14
13
12
11
±10
–11
–12
–13
–14
V_S = ±15V
–15
–50
0
50
TEMPERATURE (°C)
100
10578 G20
Supply Current
vs Temperature
3
2
V_S = ±15V
V_S = ±10V
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
10578 G23
Common Mode and Power Supply
Rejections vs Temperature
120
V_S = ±10V TO ±17V FOR PSRR
V_S = ±15V, V_CM = ±10.5V FOR CMRR
110
PSRR
CMRR
100
90
–25
25
75
TEMPERATURE (°C)
125
10578 G21
Short-Circuit Current vs Time
(One Output Shorted to Ground)
50
40 ^{VS = ±15V}
30
T_A = –55°C
20
T_A = 25°C
10
T_A = 125°C
0
–10
T_A = 125°C
–20
T_A = 25°C
–30
T_A = –55°C
–40
–50
0
1
2
3
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
10578 G24
APPLICATIONS INFORMATION
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
8
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_FC_F, the effect of the feedback pole is
completely removed.
C_F
R_F
–
C_IN
R_S
C_S
+
OUTPUT
10578 F01
10578fd