Datasheet

5
LT1028/LT1128
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
10Hz Voltage Noise Distribution
Total Noise vs Matched Source
Resistance
Total Noise vs Unmatched
Source Resistance Current Noise Spectrum
0.01Hz to 1Hz Voltage Noise
TEMPERATURE (°C)
–50
0
RMS VOLTAGE DENSITY (nV/√Hz)
0.8
2.0
0
50
75
LT1028/1128 • TPC09
O.4
1.6

1.2
–25
25
100
125
V
S
= ±15V
AT 10Hz
AT 1kHz
Voltage Noise vs Temperature
0.1Hz to 10Hz Voltage Noise
TIME (SEC)
08
LT1028/1128 • TPC07
2
4
6
10
10nV
V
S
= ±15V
T
A
= 25°C
Wideband Noise, DC to 20kHz
BANDWIDTH (Hz)
100
RMS VOLTAGE NOISE (µV)
0.1
1
100k 1M 10M
LT1028/1128 • TPC03
0.01
10
10k1k
V
S
= ±15V
T
A
= 25°C
Wideband Voltage Noise
(0.1Hz to Frequency Indicated)
MATCHED SOURCE RESISTANCE (Ω)
1
TOTAL NOISE DENSITY (nV/√Hz)
10
100
3 1k 10k
LT1028/1128 • TPC04
1
0.1
V
S
= ±15V
T
A
= 25°C

10 30 100 300 3k
AT 10Hz
2 R
S
NOISE ONLY
AT 1kHz
–
+
R
S
R
S
UNMATCHED SOURCE RESISTANCE (Ω)
1
TOTAL NOISE DENSITY (nV/√Hz)
10
100
3 1k 10k
LT1028/1128 • TPC05
1
0.1
V
S
= ±15V
T
A
= 25°C

10 30 100 300 3k
AT 10Hz
2 R
S
NOISE ONLY
AT 1kHz
R
S
TIME (SEC)
080
LT1028/1128 • TPC07
20
40
60
100
10nV
V
S
= ±15V
T
A
= 25°C
FREQUENCY (Hz)
10
0.1
CURRENT NOISE DENSITY (pA/√Hz)
1
10
100
100 1k 10k
LT1028/1128 • TPC06
MAXIMUM
TYPICAL
1/f CORNER = 800Hz
1/f CORNER = 250Hz
0.6
0
NUMBER OF UNITS
20
60
80
100
1.0
1.4
1.8
180
LT1020/1120 • TPC01
40
0.8 1.2
120
140
160
1.6 2.0 2.2
8
70
148
158
57
28

7
4
2
3
2
22
1
3
2
11
1
V
S
= ±15V
T
A
= 25°C
500 UNITS
MEASURED
FROM 4 RUNS
VOLTAGE NOISE DENSITY (nV/√Hz)
VERTICAL SCALE = 0.5µV/DIV
HORIZONTAL SCALE = 0.5ms/DIV