Datasheet
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LOG101
3
SBOS242B
TOTAL ERROR
(4)(5)
I
1
or I
2
remains fixed while other varies.
Initial Min to Max
I
1
or I
2
= 3.5mA ±75 mV
I
1
or I
2
= 1mA ±20 mV
I
1
or I
2
= 100µA ±20 mV
I
1
or I
2
= 10µA ±20 mV
I
1
or I
2
= 1µA ±20 mV
I
1
or I
2
= 100nA ±20 mV
I
1
or I
2
= 10nA ±20 mV
I
1
or I
2
= 1nA ±20 mV
I
1
or I
2
= 350pA ±20 mV
I
1
or I
2
= 100pA ±20 mV
vs Temperature I
1
or I
2
= 3.5mA ±1.2 mV/°C
I
1
or I
2
= 1mA ±0.4 mV/°C
I
1
or I
2
= 100µA ±0.1 mV/°C
I
1
or I
2
= 10µA ±0.05 mV/°C
I
1
or I
2
= 1µA ±0.05 mV/°C
I
1
or I
2
= 100nA ±0.09 mV/°C
I
1
or I
2
= 10nA ±0.2 mV/°C
I
1
or I
2
= 1nA ±0.3 mV/°C
I
1
or I
2
= 350pA ±0.1 mV/°C
I
1
or I
2
= 100pA ±0.3 mV/°C
vs Supply I
1
or I
2
= 3.5mA ±3.0 mV/V
I
1
or I
2
= 1mA ±0.1 mV/V
I
1
or I
2
= 100µA ±0.1 mV/V
I
1
or I
2
= 10µA ±0.1 mV/V
I
1
or I
2
= 1µA ±0.1 mV/V
I
1
or I
2
= 100nA ±0.1 mV/V
I
1
or I
2
= 10nA ±0.1 mV/ V
I
1
or I
2
= 1nA ±0.25 mV/V
I
1
or I
2
= 350pA ±0.1 mV/V
I
1
or I
2
= 100pA ±0.1 mV/V
FREQUENCY RESPONSE, CORE LOG
(6)
BW, 3dB
I
2
= 10nA C
C
= 4500pF 0.1 kHz
I
2
= 1µAC
C
= 150pF 38 kHz
I
2
= 10µAC
C
= 150pF 40 kHz
I
2
= 1mA C
C
= 50pF 45 kHz
Step Response
Increasing
I
2
= 1µA to 1mA C
C
= 150pF 11 µs
I
2
= 100nA to 1µAC
C
= 150pF 7 µs
I
2
= 10nA to 100nA C
C
= 150pF 110 µs
Decreasing
I
2
= 1mA to 1µAC
C
= 150pF 45 µs
I
2
= 1µA to 100nA C
C
= 150pF 20 µs
I
2
= 100nA to 10nA C
C
= 150pF 550 µs
POWER SUPPLY
Operating Range V
S
±4.5 ±18 V
Quiescent Current I
O
= 0 ±1 ±1.5 mA
TEMPERATURE RANGE
Specified Range, T
MIN
to T
MAX
–575°C
Operating Range –40 85 °C
Storage Range –55 125 °C
Thermal Resistance,
θ
JA
SO-8 150 °C/W
NOTES: (1) Log Conformity Error is peak deviation from the best-fit straight line of V
OUT
versus log (I
1
/I
2
) curve expressed as a percent of peak-to-peak full-scale.
(2) May require higher supply for full dynamic range.
(3) Output core log function is trimmed to 1V output per decade change of input current.
(4) Worst-case Total Error for any ratio of I
1
/I
2
is the largest of the two errors, when I
1
and I
2
are considered separately.
(5) Total I
1
+ I
2
should be kept below 4.5mA on ±5V supply.
(6) Bandwidth (3dB) and transient response are a function of both the compensation capacitor and the level of input current.
ELECTRICAL CHARACTERISTICS (Cont.)
Boldface limits apply over the specified temperature range, T
A
= –5°C to +75°C.
At T
A
= +25°C, V
S
= ±5V, and R
L
= 10kΩ, unless otherwise noted.
LOG101AID
PARAMETER CONDITION MIN TYP MAX UNITS