LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
www.ti.com
SLOS456J–JANUARY 2005–REVISED SEPTEMBER 2006
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 (_C)
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
Z
No Capacitor
T = 25°C
J
V
= 2.5 V
= 1 mA
Z
1-µF
Tantanlum
Capacitor
I
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
= 200 µA
Z
I
Z
V
= 2.5 V
Z
T = 25°C
J
2
V
IN
T = 25°C
J
4
R
= 30 kΩ
0
S
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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