LOG104 datasheet(4/13 Pages) TI

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LOG104

SBOS243B

TYPICAL CHARACTERISTICS

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

ONE CYCLE OF NORMALIZED TRANSFER FUNCTION

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

110

Current Ratio, I

1/I2

2.0

1.5

1.0

0.5

0.0

–0.5

–1.0

–1.5

–2.0

NORMALIZED TRANSFER FUNCTION

0.0001 0.001

0.01

0.1

100

10k

Current Ratio, I

1/I2

OUT = 0.5V LOG (I1/I2)

3dB FREQUENCY RESPONSE

0.1

100k

10k

100

µA

100

µA

1mA

1 = 1mA

µA

1mA

to 10

µA

100nA

10nA

1 = 1nA

10nA

C C

= 1000pF

C C

= 1

µF

10µ

A to

1µ

C C

= 10pF

1nA

100

µA

100pA

1nA

10nA

100nA

µA10µA 100µA1mA

µA

100

µA

1 = 1nA

10nA

120

100

100pA 1nA

10nA 100nA

µA10µA 100µA 1mA 10mA

TOTAL ERROR vs INPUT CURRENT

Input Current (I

1 or I2)

+75

°C

+25

°C –5°C

5.8

4.8

3.8

2.8

1.8

0.8

–0.2

100pA 1nA

10nA 100nA 1

µA10µA 100µA 1mA 10mA

GAIN ERROR (I

2 = 1µA)

Input Current (I

1 or I2)

–5

°C to –40°C

+85

°C

+75

°C

+25

°C

MINIMUM VALUE OF COMPENSATION CAPACITOR

100M

10M

100k

10k

100

100pA

1nA

10nA 100nA

µA10µA 100µA 1mA 10mA

1 = 100pA

1 = 1nA

1 = 10nA

1 = 100nA

µA

1 = 10µA

100

µA

1mA

Select C

C for I1 min.

and I

2 max. Values

below 2pF may be ignored.

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