Datasheet

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SBOS301A − MAY 2004 − REVISED MARCH 2007
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7
TYPICAL CHARACTERISTICS: V
S
= +5V
All specifications at T
A
= +25°C, R
VLOGOUT
= 10kΩ, V
CM
= GND, unless otherwise noted.
2.0
1.5
1.0
0.5
0
−
0.5
−
1.0
−
1.5
−
2.0
Normalized Output Voltage (V)
NORMALIZED TRANSFER FUNCTION
10
−4
10
−3
10
−2
10
−1
110
1
10
2
10
3
10
4
Current Ratio (I
1
/I
2
)
ONE CYCLE OF NORMALIZED TRANSFER FUNCTION
Normalized Output Voltage (V)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
110
Current Ratio (I
1
/I
2
)
40
30
20
10
0
−
10
−
20
1nA 10nA 100nA 1
µ
A10
µ
A100
µ
A 1mA 10mA100pA
SCALING FACTOR ERROR (I
2
= reference 100pA to 10mA)
Input Current (I
1
)
Gain Error (%)
+90
_
C
+80
_
C
+70
_
C
0
_
C
+25
_
C
−
10
_
C
2.5
2.0
1.5
1.0
0.5
0
−
0.5
−
1.0
−
1.5
−
2.0
−
2.5
1nA 10nA 100nA 1
µ
A10
µ
A100
µ
A 1mA 10mA100pA
V
LOGOUT
vs I
1
INPUT (I
2
=1
µ
A)
Input Current (I
1
)
V
LOGOUT
(V)
2.0
1.5
1.0
0.5
0
−
0.5
−
1.0
−
1.5
−
2.0
−
2.5
1nA 10nA 100nA 1
µ
A10
µ
A100
µ
A1mA100pA
V
LOGOUT
vs I
2
INPUT (I
1
=1
µ
A)
Input Current (I
1
)
V
LOGOUT
(V)
10mA
4
3
2
1
0
−
1
−
2
−
3
−
4
1nA 10nA 100nA 1
µ
A10
µ
A 100
µ
A 1mA 10mA100pA
V
LOGOUT
vs I
REF
I
REF
(I
2
)
V
LOGOUT
(V)
100pA
1nA
10nA
100nA
1
µ
A
100
µ
A
10
µ
A
10mA
1mA