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參數(shù)資料
| 型號： | LSP2961 |
| 英文描述： | Precision Log Ratio Amplifier |
| 中文描述： | 精密對數(shù)比例放大器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 145K |
| 代理商： | LSP2961 |
Agere Systems Inc.
5
Advance Data Sheet
September 2001
Precision Log Ratio Amplifier
LSP2961
Electrical Characteristics
Table 3. Electrical Characteristics
T
A
= 25 °C, V
CC
= 5 V, V
EE
= –5 V, no external components for performance adjustment.
Note:
Terms used for the specification of the analog log amplifier:
I
Total conformity error—this is used to describe the log linearity of the log amplifier, which is the maximum
deviation from the best-fit straight line of logarithm,
allowing for offset error
.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Total
Conformity
Error
—
T
A
= 25 °C
IN = 1 nA to 1 mA
T
A
= 25 °C
IN = 1 nA to 10 mA
T
A
= 25 °C
IN = 100 pA to 10 mA
–5 °C to 70 °C
2
—
1
TBD
%
—
TBD
—
—
TBD
—
Temperature
Coefficient
1, 2
Scale Factor
1. Can be externally compensated using a thermistor and a resistor.
2. Guaranteed by design.
3. Externally adjustable using a resistor.
4. Can be nulled using an external potentiometer.
5. Transimpedance bandwidth.
6. Tested by limited samples.
7. Supply current at 1 nA < IN
< 1 mA.
8. Supply current at IN
≤
1 μA.
—
—
0.34
—
%/°C
Scale Factor
3
K
T
A
= 25 °C
IN = 1 nA to 1 mA
–5 °C to 70 °C
1
T
A
= 25 °C
IN = 1 nA to 1 mA
–5 °C to 70 °C
1
T
A
= 25 °C
IN = 1 nA to 1 mA
–5 °C to 70 °C
C = 10 pF, IN = 1 μA
—
R
LOAD
> 1 M
IN = 1 nA to 1 mA
–5 °C to 70
°C
1
IN
≤
1 μA
8
—
—
0.98
1
1.02
V/decade
Temperature Coefficient
2
Reference
Accuracy
Temperature Coefficient
2
—
—
—
—
0.95
0.34
1
—
1.05
%/°C
μ
A
Reference
Accuracy
3
—
V
OS
—
0.02
—
%/°C
Output Offset
Voltage
4
–100
—
—
V
EE
+ 1
–10
0.20
100
—
100
—
—
mV
%/°C
kHz
V
Temperature Coefficient
2
—
f
3dB
—
—
3 dB Bandwidth
5, 6
Output Voltage Range
Supply Current
7
V
CC
– 1
0.2
0.3
1.3
mA
0.18
4.5
–4.5
0.24
5.0
–5.0
0.3
5.5
–5.5
Power Supply Operation Range
2
V
CC
V
EE
V
K
---------------------------------------------------------
REF
I
log
×
V
OUT
–
V
FULLSCALE
100
%
×
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