LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
www.ti.com
SLOS456I–JANUARY 2005–REVISED DECEMBER 2005
TYPICAL CHARACTERISTICS
1000
100
10
0.6
0.5
0.4
0.3
V
= 2.5 V
= 150 µA
Z
I
Z
50 ppm/°C
20 ppm/°C
7 ppm/°C
No Capacitor
0.2
0.1
1 µF
Tantanlum
Capacitor
0
−0.1
−0.2
−0.3
−0.4
V
= 2.5 V
= 150 µA
Z
1
I
Z
T = 25°C
J
I
= 0.1 I
Z,AC
Z
X
C
0.1
−40 −20
0
20
40
60
80 100 120
100
1k
10k
100k
1M
Temperature (PC)
Frequency (Hz)
Figure 1. Temperature Drift for Different Average
Temperature Coefficients
Figure 2. Output Impedance vs Frequency
1000
100
10
120
100
80
60
40
20
0
V = 2.5 V
T = 25°C
J
Z
No Capacitor
V = 2.5 V
Z
1-µF
Tantanlum
Capacitor
I = 1 mA
Z
T = 25°C
J
I
= 0.1 I
Z
Z,AC
1
X
C
0.1
0.0
0
1.0
1
1.5
1.5
2.0
2
3.0
3
0.5
2.5
100
1k
10k
100k
1M
Frequency (Hz)
V , Reverse Voltage (V)
Z
Figure 3. Output Impedance vs Frequency
Figure 4. Temperature Drift for Different Average
Temperature Coefficient
10
6
4
6
5
V = 2.5 V
Z
I = 200 µA
Z
V = 2.5 V
Z
T = 25°C
J
2
V
IN
T = 25°C
J
4
R
S
= 30 kΩ
0
3
−2
−4
1
2
V
Z
−6
1
−8
0
−10
−1
−10
−12
0.1
0
10 20 30 40 50 60 70 80 90
1
10
100
1k
10k
100k
Frequency (Hz)
Response Time (µs)
Figure 5. Noise Voltage vs Frequency
Figure 6. Start-Up Characteristics
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