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参数资料
| 型号： | LSP2961 |
| 厂商： | LSI CORP |
| 元件分类： | 模拟运算功能 |
| 英文描述： | LOG OR ANTILOG AMPLIFIER, 0.1 MHz BAND WIDTH, PDSO8 |
| 封装： | 3 X 3 MM, TSSOP-8 |
| 文件页数： | 5/6页 |
| 文件大小： | 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
TA = 25 °C, VCC = 5 V, VEE = –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
—TA = 25 °C
IN = 1 nA to 1 mA
—1
TBD
%
TA = 25 °C
IN = 1 nA to 10 mA
—TBD
—
TA = 25 °C
IN = 100 pA to 10 mA
—TBD
—
Temperature
Coefficient1, 2
1. Can be externally compensated using a thermistor and a resistor.
—
–5 °C to 70 °C2
2. Guaranteed by design.
—0.34
—
%/°C
Scale Factor 3
3. Externally adjustable using a resistor.
Scale Factor
K
TA = 25 °C
IN = 1 nA to 1 mA
0.98
1
1.02
V/decade
Temperature Coefficient2
—
–5 °C to 70 °C1
—0.34
—
%/°C
Reference
Accuracy 3
Reference
Accuracy
—TA = 25 °C
IN = 1 nA to 1 mA
0.95
1
1.05
A
Temperature Coefficient2
—
–5 °C to 70 °C1
—0.02
—
%/°C
Output Offset
Voltage 4
4. Can be nulled using an external potentiometer.
—VOS
TA = 25 °C
IN = 1 nA to 1 mA
–100
–10
100
mV
Temperature Coefficient2
—
–5 °C to 70 °C
—
0.20
—
%/°C
3 dB Bandwidth 5, 6
5. Transimpedance bandwidth.
6. Tested by limited samples.
f3dB
C = 10 pF, IN = 1 A
—
100
—
kHz
Output Voltage Range
—
VEE + 1
—
VCC – 1
V
Supply Current 7
7. Supply current at 1 nA < IN < 1 mA.
—RLOAD > 1 M
IN = 1 nA to 1 mA
–5 °C to 70 °C1
0.2
0.3
1.3
mA
IN
≤ 1 A 8
8. Supply current at IN
≤ 1 A.
0.18
0.24
0.3
Power Supply Operation Range2
VCC
—
4.5
5.0
5.5
V
VEE
—
–4.5
–5.0
–5.5
K
IREF
IIN
------------
log
×
VOUT
–
VFULLSCALE
---------------------------------------------------------
100
%
×
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