LT1028/LT1128
TYPICAL PERFOR A CE CHARACTERISTICS
10Hz Voltage Noise Distribution
180
160
140
NUMBER OF UNITS
158
148
120
100
80
60
40
20
0
0.6
8
70
57
RMS VOLTAGE NOISE (µV)
V
S
=
±15V
T
A
= 25°C
500 UNITS
MEASURED
FROM 4 RUNS
28
74 3
2 2 2 12
3 21 1 1
0.8 1.0 1.2 1.4 1.6 1.8 2.0
VOLTAGE NOISE DENSITY (nV/√Hz)
LT1020/1120 • TPC01
Total Noise vs Matched Source
Resistance
100
R
S
TOTAL NOISE DENSITY (nV/√Hz)
R
S
+
TOTAL NOISE DENSITY (nV/√Hz)
–
CURRENT NOISE DENSITY (pA/√Hz)
10
AT 10Hz
1
2 R
S
NOISE ONLY
V
S
=
±15V
T
A
= 25°C
0.1
1
10 30 100 300 1k 3k
3
MATCHED SOURCE RESISTANCE (Ω)
10k
AT 1kHz
LT1028/1128 • TPC04
0.1Hz to 10Hz Voltage Noise
V
S
=
±15V
T
A
= 25°C
RMS VOLTAGE DENSITY (nV/√Hz)
10nV
0
2
6
4
TIME (SEC)
LT1028/1128 • TPC07
U W
2.2
8
10
Wideband Noise, DC to 20kHz
10
Wideband Voltage Noise
(0.1Hz to Frequency Indicated)
V
S
=
±15V
T
A
= 25°C
1
0.1
VERTICAL SCALE = 0.5µV/DIV
HORIZONTAL SCALE = 0.5ms/DIV
0.01
100
1k
100k
10k
BANDWIDTH (Hz)
1M
10M
LT1028/1128 • TPC03
Total Noise vs Unmatched
Source Resistance
100
R
S
Current Noise Spectrum
100
10
10
MAXIMUM
1/f CORNER = 800Hz
TYPICAL
AT 10Hz
1
AT 1kHz
1
1/f CORNER = 250Hz
2 R
S
NOISE ONLY
V
S
=
±15V
T
A
= 25°C
0.1
1
10 30 100 300 1k 3k 10k
3
UNMATCHED SOURCE RESISTANCE (Ω)
LT1028/1128 • TPC05
0.1
10
100
1k
FREQUENCY (Hz)
10k
LT1028/1128 • TPC06
0.01Hz to 1Hz Voltage Noise
V
S
=
±15V
T
A
= 25°C
2.0
Voltage Noise vs Temperature
V
S
=
±15V
1.6
1.2
AT 10Hz
0.8
AT 1kHz
10nV
O.4
0
20
60
40
TIME (SEC)
80
100
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT1028/1128 • TPC08
LT1028/1128 • TPC09
5
LINER [ LINEAR TECHNOLOGY ]
