LOG102AID datasheet(4/19 Pages) TI1

Part #	LOG102AID

Description	LOGARITHMIC AND LOG RATIO AMPLIFIER

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LOG102

4

SBOS211B

TYPICAL CHARACTERISTICS

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

0

ONE CYCLE OF NORMALIZED TRANSFER FUNCTION

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

26

110

3

Current Ratio,

I

1

I

2

48

3dB FREQUENCY RESPONSE

I

2

0.1

1nA

1M

100k

10k

1k

100

10

1

10nA

100nA

1

µA10µA

100

µA

1mA

100

µA

100

µA

1mA

I

1 = 1mA

1

µA

1mA

to 10

µA

100nA

10nA

I

1 = 1nA

10nA

1

µA

10

µA

100

µA

C C

=

1µ

F

C C

= 1000pF

10µ

A to

1µ

A

C C

= 10pF

I

1 = 1nA

1nA

100

µA

NORMALIZED TRANSFER FUNCTION

0.001

3

2

1

0

–1

–2

–3

0.01

1

100

Current Ratio,

0.1

10

1000

I

1

I

2

I

1

I

2

V

OUT = 1V • Log

TOTAL ERROR vs INPUT CURRENT

1nA

60

50

40

30

20

10

0

100nA

10nA

70

°C

0

°C

25

°C

10

µA

100

µA

Input Current

(I

1 or I2)

1

µA

1mA

MINIMUM VALUE OF COMPENSATION CAPACITOR

1nA

10000

1000

100

10

1

100nA

10nA

10

µA

1mA

I

2

1

µA

100

µA

10mA

Select C

C for I1 min

and I

2 max

I

1 = 1nA

Values below 2pF

may be ignored.

I

1 = 1mA

I

1 = 100µA

I

1 = 10nA

I

1 = 100nA

I

1 = 1µA

I

1 = 10µA

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

–0.05

–0.10

–60

–40

–20

0

20

40

60

80

GAIN ERROR vs TEMPERATURE

Temperature (

°C)

Not Recommended For New Designs

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