LOG100 datasheet(2/9 Pages) BURR-BROWN

Part #	LOG100

Description	Precision LOGARITHMIC AND LOG RATIO AMPLIFIER

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Manufacturer	BURR-BROWN [Burr-Brown (TI)]

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LOG100

2

SPECIFICATIONS

ELECTRICAL

T

A = +25°C and ±VCC = ±15V, after 15 minute warm-up, unless otherwise specified.

LOG100JP

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

TRANSFER FUNCTION

V

OUT = K Log (I1/I2)

Log Conformity Error(1)

Either I

1 or I2

Initial

1nA to 100

µA (5 decades)

0.04

0.1

%

1nA to 1mA (6 decades)

0.15

0.25

%

Over Temperature

1nA to 100

µA (5 decades)

0.002

%/

°C

1nA to 1mA (6 decades)

0.001

%/

°C

K Range(2)

1, 3, 5

V/decade

Accuracy

0.3

%

Temperature Coefficient

0.03

%/

°C

ACCURACY

Total Error(3)

K = 1,(4) Current Input Operation

Initial

I

1, I2 = 1mA

±55

mV

I

1, I2 = 100µA

±30

mV

I

1, I2 = 10µA

±25

mV

I

1, I2 = 1µA

±20

mV

I

1, I2 = 100nA

±25

mV

I

1, I2 = 10nA

±30

mV

I

1, I2 = 1nA

±37

mV

vs Temperature

I

1, I2 = 1mA

±0.20

mV/

°C

I

1, I2 = 100µA

±0.37

mV/

°C

I

1, I2 = 10µA

±0.28

mV/

°C

I

1, I2 = 1µA

±0.033

mV/

°C

I

1, I2 = 100nA

±0.28

mV/

°C

I

1, I2 = 10nA

±0.51

mV/

°C

I

1, I2 = 1nA

±1.26

mV/

°C

vs Supply

I

1, I2 = 1mA

±4.3

mV/V

I

1, I2 = 100µA

±1.5

mV/V

I

1, I2 = 10µA

±0.37

mV/V

I

1, I2 = 1µA

±0.11

mV/V

I

1, I2 = 100nA

±0.61

mV/V

I

1, I2 = 10nA

±0.91

mV/V

I

1, I2 = 1nA

±2.6

mV/V

INPUT CHARACTERISTICS (of Amplifiers A

1 and A2)

Offset Voltage

Initial

±0.7

±5mV

vs Temperature

±80

µV/°C

Bias Current

Initial

15(5)

pA

vs Temperature

Doubles Every 10

°C

Voltage Noise

10Hz to 10kHz, RTI

3

µVrms

Current Noise

10Hz to 10kHz, RTI

0.5

pArms

AC PERFORMANCE

3dB Response(6), I

2 = 10µA

1nA

C

C = 4500pF

0.11

kHz

1

µAC

C = 150pF

38

kHz

10

µAC

C = 150pF

27

kHz

1mA

C

C = 50pF

45

kHz

Step Response(6)

Increasing

C

C = 150pF

1

µA to 1mA

11

µs

100nA to 1

µA

7

µs

10nA to 100nA

110

µs

Decreasing

C

C = 150pF

1mA to 1

µA

45

µs

1

µA to 100nA

20

µs

100nA to 10nA

550

µs

OUTPUT CHARACTERISTICS

Full Scale Output (FSO)

±10

V

Rated Output

Voltage

I

OUT = ±5mA

±10

V

Current

V

OUT = ±10V

±5mA

Current Limit

Positive

12.5

mA

Negative

15

mA

Impedance

0.05

Ω

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