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LOG104

SBOS243B

TOTAL ERROR(4)(5)

I1 or I2 remains fixed while other varies.

Initial

Min to Max

I1 or I2 = 3.5mA

±75

I1 or I2 = 1mA

±20

I1 or I2 = 100µA

±20

I1 or I2 = 10µA

±20

I1 or I2 = 1µA

±20

I1 or I2 = 100nA

±20

I1 or I2 = 10nA

±20

I1 or I2 = 1nA

±20

I1 or I2 = 350pA

±20

I1 or I2 = 100pA

±20

vs Temperature

I1 or I2 = 3.5mA

±1.2

mV/

°C

I1 or I2 = 1mA

±0.4

mV/

°C

I1 or I2 = 100µA

±0.1

mV/

°C

I1 or I2 = 10µA

±0.05

mV/

°C

I1 or I2 = 1µA

±0.05

mV/

°C

I1 or I2 = 100nA

±0.09

mV/

°C

I1 or I2 = 10nA

±0.2

mV/

°C

I1 or I2 = 1nA

±0.3

mV/

°C

I1 or I2 = 350pA

±0.1

mV/

°C

I1 or I2 = 100pA

±0.3

mV/

°C

vs Supply

I1 or I2 = 3.5mA

±3.0

mV/ V

I1 or I2 = 1mA

±0.1

mV/ V

I1 or I2 = 100µA

±0.1

mV/ V

I1 or I2 = 10µA

±0.1

mV/ V

I1 or I2 = 1µA

±0.1

mV/ V

I1 or I2 = 100nA

±0.1

mV/ V

I1 or I2 = 10nA

±0.1

mV/ V

I1 or I2 = 1nA

±0.25

mV/V

I1 or I2 = 350pA

±0.1

mV/ V

I1 or I2 = 100pA

±0.1

mV/ V

FREQUENCY RESPONSE, CORE LOG(6)

BW, 3dB

I2 = 10nA

CC = 4500pF

0.1

kHz

I2 = 1µACC = 150pF

kHz

I2 = 10µACC = 150pF

kHz

I2 = 1mA

CC = 50pF

kHz

Step Response

Increasing

I2 = 1µA to 1mA

CC = 150pF

µs

I2 = 100nA to 1µACC = 150pF

µs

I2 = 10nA to 100nA

CC = 150pF

110

µs

Decreasing

I2 = 1mA to 1µACC = 150pF

µs

I2 = 1µA to 100nA

CC = 150pF

µs

I2 = 100nA to 10nA

CC = 150pF

550

µs

POWER SUPPLY

Operating Range

±4.5

±18

Quiescent Current

IO = 0

±1

±1.5

TEMPERATURE RANGE

Specified Range, TMIN to TMAX

–575

°C

Operating Range

–40

°C

Storage Range

–55

125

°C

Thermal Resistance,

JA SO-8

150

°C/W

NOTES: (1) Log Conformity Error is peak deviation from the best-fit straight line of VOUT versus log (I1/I2) 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 0.5V output per decade change of input current.

(4) Worst-case Total Error for any ratio of I1/I2 is the largest of the two errors, when I1 and I2 are considered separately.

(5) Total I1 + I2 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, TA = –5°C to +75°C.

At TA = +25°C, VS = ±5V, RL = 10kΩ, unless otherwise noted.

LOG104AID

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

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