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PDF LT1457ACN8 Data sheet ( Hoja de datos )
| Número de pieza | LT1457ACN8 | |
| Descripción | Dual/ Precision JFET Input Op Amp | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1457
Dual, Precision
JFET Input Op Amp
FEATURES
s Handles 10,000pF Capacitive Load
s 450µV Max Offset Voltage
s 1200µV Max Offset Voltage in S8 Package
s 50pA Bias Current at 70°C
s 13nV/√Hz Voltage Noise
s 4V/µs Slew Rate
s 4µV/°C Drift
s 130dB Channel Separation
U
APPLICATIONS
s Sample-and-Hold (Drives Large Hold Capacitors)
s A/D and D/A Converters
s Photodiode Amplifiers
s Voltage-to-Frequency Converters
DESCRIPTION
The LT1457 is a dual, JFET input op amp optimized for
handling large capacitive loads in combination with preci-
sion performance.
Precision specifications include 220µV offset voltage in
plastic and surface mount packages. At 70°C input bias
current is 50pA, input offset current is 20pA. Channel
separation is 130dB.
Other dual JFET input op amps from Linear Technology
include the LT1057, which is three times faster than the
LT1457 but at the expense of significantly lower capacitive
load handling capability; and the LT1113 with 4.5nV/√Hz
voltage noise.
TYPICAL PERFORMANCE CHARACTERISTICS
Capacitive Load Handling
100
VS = ±15V
TA = 25°C
80 AV = +1
60
40
20
0
0.1 1 10 100
CAPACITIVE LOAD (nF)
LT11457• TA01
Input Offset Voltage Distribution
S8 Package
21
VS = ±15V
18 TA = 25°C
15
400 DUALS
(800 OP AMPS)
TESTED FROM
3 RUNS
12
9
6
3
0
–1.0–0.8 –0.6–0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0
INPUT OFFSET VOLTAGE (mV)
LT1457 • TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1457
Common-Mode Rejection Ratio
vs Frequency
120
VS = ±15V
100 TA = 25°C
80
60
40
20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
LT1457• TPC10
Slew Rate, Gain-Bandwidth
Product vs Temperature
10
VS = ±15V
2.5
8
SLEW FALL 2.0
6
GBW
1.5
4
SLEW RISE 1.0
2
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
LT1457 • TPC18
Gain, Phase vs Frequency
25
PHASE MARGIN = 80°, CL = 10pF
20 PHASE MARGIN = 51°, CL = 1000pF
100
15 CL = 10pF 80
10
PHASE
60
5 CL = 1000pF 40
0 GAIN
20
–5
–10
–15
0.1
VS = ±15V
TA = 25°C
CL = 1000pF
CL = 10pF
1.0
FREQUENCY (MHz)
0
–20
10
LT1457 • TPC16
Common-Mode Range vs
Temperature
15
14
13
12
11
±10
–11
–12
–13
–14 VS = ±15V
–15
– 50 –25
0
25 50 75 100
TEMPERATURE (°C)
LT1457 • TPC11
Supply Current vs Temperature
3
2 VS = ±15V
VS = ±5V
1
0
– 50
–25 0 25 50
TEMPERATURE (°C)
75 100
LT1457 • TPC14
Common-Mode and Power Supply
Rejections vs Temperature
120
VS = ±5V TO ±17V FOR PSRR
VS = ±15V, VCM = ±10.5V FOR CMRR
110
PSRR
CMRR
100
90
– 50
–25 0 25 50
TEMPERATURE (°C)
75 100
LT1457 • TPC12
Short-Circuit Current vs Time
(One Output Shorted to Ground)
50
40 TA = – 40°C
30
20
10 TA = 25°C
0
–10 TA = 25°C
TA = 85°C
TA = 85°C
–20
–30
– 40 VS = ±15V
TA = – 40°C
– 50
01 2 3
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
LT1457 • TPC15
Undistorted Output Swing vs
Frequency
30
VS = ±15V
TA = 25°C
24
18
12
6
0
10k
100k
1M
FREQUENCY (Hz)
10M
LT11457• TPC17
Power Supply Rejection Ratio
vs Frequency
140
TA = 25°C
120
100
POSITIVE
80 SUPPLY
60 NEGATIVE
SUPPLY
40
20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
LT1457• TPC13
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LT1457ACN8.PDF ] | |
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