LOG112 datasheet(4/14 Pages) TI

4 / 14 page

LOG112, 2112

SBOS246C

www.ti.com

FREQUENCY RESPONSE, CORE LOG(5)

BW, 3dB

I2 = 10nA

CC = 4500pF

0.1

I2 = 1µACC = 150pF

I2 = 10µACC = 150pF

I2 = 1mA

CC = 50pF

kHz

Step Response

Increasing

I1 = 10nA to 100nA

CC = 120pF, I2 = 31.6nA

1.1

I1 = 1µA to 100µACC = 375pF, I2 = 10µA

1.6

µs

I1 = 1µA to 1mA

CC = 950pF, I2 = 31.6µA

1.5

µs

Decreasing

I1 = 100nA to 10nA

CC = 120pF, I2 = 31.6nA

2.1

I1 = 100µA to 1µACC = 375pF, I2 = 10µA

31.2

µs

I1 = 1mA to 1µACC = 950pF, I2 = 31.6µA39

µs

Increasing

I2 = 10nA to 100nA

CC = 125pF, I1 = 31.6nA

2.6

I2 = 1µA to 100µACC = 750pF, I1 = 10µA

113

µs

I2 = 1µA to 1mA

CC = 10.5nF, I1 = 31.6µA

1.2

Decreasing

I2 = 100nA to 10nA

CC = 125pF, I1 = 31.6nA

630

µs

I2 = 100µA to 1µACC = 750pF, I1 = 10µA

6.6

µs

I2 = 1mA to 1µACC = 10.5nF, I1 = 31.6µA

13.3

µs

OP AMP, A3

Input Offset Voltage

+250

±1000

µV

vs Temperature

TMIN to TMAX

±2

µV/°C

vs Supply

±4.5V to ±18V

µV/V

Input Bias Current

–10

Input Offset Current

±0.5

Input Voltage Range

(V–)

(V+) – 1.5

Input Noise, f = 0.1Hz to 10Hz

µVp-p

f = 1kHz

nV/√Hz

Open-Loop Voltage Gain

Gain-Bandwidth Product

1.4

MHz

Slew Rate

0.5

µs

Settling Time, 0.01%

G = –1, 3V Step, CL = 100pF

µs

Rated Output

(V–) + 1.5

(V+) – 0.9

Short-Circuit Current

±4mA

VOLTAGE REFERENCE

Bandgap Voltage

2.5

Error, Initial

±0.05

±0.5

vs Temperature

TMIN to TMAX

±25

ppm/

°C

vs Supply

VS = ±4.5V to ±18V

±10

ppm/V

vs Load

ILOAD = 10mA

±600

ppm/mA

Short-Circuit Current

POWER SUPPLY

Operating Range

±4.5

±18

Quiescent Current

IO = 0

LOG112

±1.25

±1.75

LOG2112

±2.5

±3.5

TEMPERATURE RANGE

Specified Range, TMIN to TMAX

–575

°C

Operating Range

–40

°C

Storage Range

–55

125

°C

Thermal Resistance,

JA SO-14

110

°C/W

SO-16

°C/W

NOTES: (1) Log Conformity Error is the peak deviation from the best-fit-straight line of VO vs LOG(I1/I2) curve expressed as a percent of peak-to-peak full-scale

output. K, scale factor, equals 0.5V output per decade of input current. (2) Scale factor of core log function is trimmed to 0.5V output per decade change of input

current. (3) Worst-case Total Error for any ratio of I1/I2, as the largest of the two errors, when I1 and I2 are considered separately. (4) Total Error includes offset

voltage, bias current, gain, and log conformity. (5) 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, and RL = 10kΩ, unless otherwise noted.

LOG112, LOG2112

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

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