LSP2961 Datasheet, PDF (5/6 Pages) Agere Systems – Precision Log Ratio Amplifier

Advance Data Sheet
September 2001
LSP2961
Precision Log Ratio Amplifier
Electrical Characteristics
Table 3. Electrical Characteristics
TA = 25 °C, VCC = 5 V, VEE = –5 V, no external components for performance adjustment.
Parameter
Symbol
Conditions
Min Typ Max Unit
Total
—
TA = 25 °C
—
1 TBD
%
Conformity
Error
K_-------×_---V-l_--o_--F-g_---U---I_--_-L-^R_-I---_-IL-_--^E-_N--_S--_--^F_--_{-C---–--A---}V_-L---E-O_-----U_----T_{-- × 100%}
IN = 1 nA to 1 mA
TA = 25 °C
— TBD —
IN = 1 nA to 10 mA
Scale Factor ³
Temperature
Coefficient^{1, 2}
Scale Factor
Temperature Coefficient²
TA = 25 °C
— TBD —
IN = 100 pA to 10 mA
—
–5 °C to 70 °C²
— 0.34 —
%/°C
K
TA = 25 °C
0.98 1 1.02 V/decade
IN = 1 nA to 1 mA
—
–5 °C to 70 °C¹
— 0.34 —
%/°C
Reference
Accuracy ³
Reference
—
Accuracy
Temperature Coefficient² —
TA = 25 °C
IN = 1 nA to 1 mA
–5 °C to 70 °C¹
0.95 1 1.05
— 0.02 —
µA
%/°C
Output Offset
Voltage ⁴
—
VOS
TA = 25 °C
IN = 1 nA to 1 mA –100 –10 100
Temperature Coefficient² —
–5 °C to 70 °C
— 0.20 —
3 dB Bandwidth ^{5, 6}
f3dB C = 10 pF, IN = 1 µA — 100 —
mV
%/°C
kHz
Output Voltage Range
Supply Current ⁷
Power Supply Operation Range²
—
—
VEE + 1 — VCC – 1
V
—
RLOAD > 1 MΩ
IN = 1 nA to 1 mA 0.2 0.3 1.3
mA
–5 °C to 70 °C¹
IN ≤ 1 µA ⁸
0.18 0.24 0.3
VCC
—
4.5 5.0 5.5
V
VEE
—
–4.5 –5.0 –5.5
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.
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.
Agere Systems Inc.
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