Datasheet

6
LT2078/LT2079
20789fa
TIME (SEC)
0
NOISE VOLTAGE (0.4µV/DIV)
8
LT2078/79 • TPC04
2
4
6
10
CHANNEL A
CHANNEL B
T
A
= 25°C
V
S
= ±2.5V
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Noise Spectrum
0.01Hz to 10Hz Noise
TIME (SEC)
0
NOISE VOLTAGE (0.4µV/DIV)
80
LT2078/79 • TPC05
20
40
60
100
CHANNEL B
T
A
= 25°C
V
S
= ±2.5V
CHANNEL A
0.4µV
FREQUENCY (Hz)
0.1 1 100
10
VOLTAGE NOISE DENSITY (nV/√Hz)
CURRENT NOISE DENSITY (fA/√Hz)
100
30
1000
300
10 1000
LT2078/79 • TPC06
CURRENT
NOISE
VOLTAGE
NOISE
1/f CORNER
0.7Hz
T
A
= 25°C
V
S
= ±2.5V
(AT V
S
= ±15V
VOLTAGE NOISE
IS 4% LESS
CURRENT NOISE
IS UNCHANGED)
Warm-Up Drift
Long Term Stability of Two
Representative Units (LT2078)10Hz Voltage Noise Distribution
VOLTAGE NOISE DENSITY (nV/√Hz)
25
LT2078/79 • TPC07
30
35 40
PERCENT OF UNITS
35
30
25
20
15
10
5
0
T
A
= 25°C
V
S
= ±2.5V
TIME AFTER POWER-ON (MINUTES)
0
CHANGE IN OFFSET VOLTAGE (µV)
LT2078/79 • TPC09
12
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3
T
A
= 25°C
V
S
= ±15V
WARM UP DRIFT
AT V
S
= 5V, 0V IS
IMMEASURABLY LOW
LT2079
LT2078
TIME (MONTHS)
0
OFFSET VOLTAGE CHANGE (µV)
1234
LT2078/79 • TPC08
5
15
10
5
0
–5
–10
–15
T
A
= 25°C, V
S
= 5V, 0V
V
CM
= 0.1V
1A
2B
1B
2A
Output Voltage Swing vs
Load Current
Output Saturation vs Temperature
vs Sink CurrentMinimum Supply Voltage
POSITIVE SUPPLY VOLTAGE (V)
0
INPUT OFFSET VOLTAGE (µV)
100
0
–100
–200
–300
–400
–500
LT2078/79 • TPC10
1
23
V
–
= 0V
–0.1V ≤ V
CM
≤ 0.4V
125°C
–55°C
0°C
25°C
70°C
NONFUNCTIONAL
TEMPERATURE (°C)
–50
SATURATION VOLTAGE (mV)
1000
100
10
1
–25 125
LT2078/79 • TPC11
0 25 50 10075
I
SINK
= 2mA
I
SINK
= 1mA
I
SINK
= 100µA
I
SINK
= 1µA
NO LOAD
R
L
= 5k TO GND
I
SINK
= 10µA
V
S
= 5V, 0V
SOURCING OR SINKING LOAD CURRENT (mA)
0.01
OUTPUT VOLTAGE SWING (V)
V
+
V
+
– 1
V
+
– 2
V
–
+ 2
V
–
+ 1
V
–
10
LT2078/79 • TPC11.5
0.1 1
125°C
25°C
–55°C
125°C
–55°C
25°C
0.1Hz to 10Hz Noise