LOG100JP datasheet(4/11 Pages) TI1

Part #	LOG100JP

Description	LOGARITHMIC AND LOG RATIO AMPLIFIER

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Manufacturer	TI1 [Texas Instruments]

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®

LOG100

4

3dB FREQUENCY RESPONSE

I

2

0.1

1nA

1M

100k

10k

1k

100

10

1

10nA

100nA

1µA

10µA

100µA

1mA

100µA

1mA

I

1 = 1mA

1µA

1mA

to 10µA

100nA

10nA

I

1 = 1nA

10nA

1µA

10µA

100µA

C C

=

1µF

C C

= 1000pF

10µA

to

1µA

C C

= 10pF

I

1 = 1nA

1nA

100µA

MINIMUM VALUE OF COMPENSATION CAPACITOR

Input Current, I

2

1

1nA

1mA

100nA

10µA

1M

100k

10k

1k

100

10

100µA

1µA

10nA

Select C

C for

I

1 min and I2 max

Values below 2pF

may be ignored.

I

1 = 1nA

I

1 = 10nA

I

1 = 100nA

I

1 = 1µA

I

1 = 10µA

I

1 = 100µA to 1mA

TRIMMED OUTPUT ERROR vs INPUT CURRENT

1nA

60

50

40

30

20

10

0

–10

Input Current (I

1 or I2)

100nA

10µA

1mA

–20

–60

–50

–40

–30

–20

–10

0

10

20

Gain Error and

Offset Error Trimmed

to Zero

TOTAL ERROR vs INPUT CURRENT

Input Current ( I

1 or I2)

1nA

±75

±50

±25

100nA

10µA

1mA

0

ONE CYCLE OF NORMALIZED TRANSFER FUNCTION

1 (K)

0.9 (K)

0.8 (K)

0.7 (K)

0.6 (K)

0.5 (K)

0.4 (K)

0.3 (K)

0.2 (K)

0.1 (K)

26

110

3

Current Ratio,

I

1

I

2

48

NORMALIZED TRANSFER FUNCTION

0.001

3 (K)

2 (K)

1 (K)

0 (K)

–1 (K)

–2 (K)

–3 (K)

0.01

1

100

Current Ratio,

0.1

10

1000

I

1

I

2

I

1

I

2

V

OUT = K Log

TYPICAL PERFORMANCE CURVES

T

A = +25°C, VCC = ±15VDC, unless otherwise noted.

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