LM4040
PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE
SLOS456J 鈥?JANUARY 2005 鈥?REVISED SEPTEMBER 2006
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TYPICAL CHARACTERISTICS
0.5
0.4
V
Z
, Change
(%)
0.3
0.2
0.1
0
鈭?.1
鈭?.2
鈭?.3
鈭?.4
鈭?0
鈭?0
0
20
40
60
80
Temperature (_C)
100
120
V
Z
= 2.5 V
I
Z
= 150
碌A
50 ppm/掳C
20 ppm/掳C
7 ppm/掳C
Z
Z
, Dynamic Output Impedance (鈩?
0.6
1000
100
No Capacitor
1
碌F
Tantanlum
Capacitor
10
V
Z
= 2.5 V
I
Z
= 150
碌A
T
J
= 25掳C
I
Z,AC
= 0.1 I
Z
1k
10k
Frequency (Hz)
1
X
C
0.1
100
100k
1M
Figure 1. Temperature Drift for Different Average
Temperature Coefficients
Z
Z
, Dynamic Output Impedance (鈩?
1000
No Capacitor
Figure 2. Output Impedance vs Frequency
120
100
80
60
40
20
0
0.0
0
V
Z
= 2.5 V
T
J
= 25掳C
100
V
Z
= 2.5 V
I
Z
= 1 mA
T
J
= 25掳C
I
Z,AC
= 0.1 I
Z
10
1-碌F
Tantanlum
Capacitor
1
X
C
0.1
100
I
Z
, Cathode Current
(碌A)
1k
10k
Frequency (Hz)
100k
1M
0.5
1.0
1
1.5
1.5
2.0
2
2.5
3.0
3
V
Z
, Reverse Voltage (V)
Figure 3. Output Impedance vs Frequency
10
6
5
4
V
Z
(V)
3
2
Figure 4. Temperature Drift for Different Average
Temperature Coefficient
6
4
V
Z
= 2.5 V
T
J
= 25掳C
R
S
= 30 k鈩?/div>
V
IN
2
V
IN
(V)
0
鈭?
鈭?
V
Z
1
0
鈭?
鈭?
鈭?0
鈭?2
0
10
20
30
40
50
60
70
80
90
Response Time (碌s)
鈭?
鈭?0
V
Z
= 2.5 V
I
Z
= 200
碌A
T
J
= 25掳C
Noise (碌VP/Hz)
1
0.1
1
10
100
1k
Frequency (Hz)
10k
100k
Figure 5. Noise Voltage vs Frequency
Figure 6. Start-Up Characteristics
26
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