LOG114 datasheet(6/29 Pages) BURR-BROWN

6 / 29 page

LOG114

SBOS301A − MAY 2004 − REVISED MARCH 2007

www.ti.com

ELECTRICAL CHARACTERISTICS: VS = +5V (continued)

Boldface limits apply over the specified temperature range, TA = −5°C to +75°C.

All specifications at TA = +25°C, RVLOGOUT = 10kΩ, VCM = +2.5V, unless otherwise noted.

LOG114

PARAMETER

UNITS

MAX

TYP

MIN

CONDITIONS

TOTAL ERROR(4, 5)

See Typical Characteristics

FREQUENCY RESPONSE, Core Log(6)

BW, 3dB I1 or I2 =

IAC = 10% of IDC value, IREF = 1µA

1nA

kHz

10nA

kHz

100nA

120

kHz

µA

2.3

MHz

µA to 1mA (ratio 1:100)

> 5

MHz

1mA to 3.5mA (ratio 1:3.5)

> 5

MHz

3.5mA to 10mA (ratio 1:2.9)

> 5

MHz

Step Response

IREF = 1µA

Increasing (I1 or I2)

8nA to 240nA (ratio 1:30)

0.7

µs

10nA to 100nA (ratio 1:10)

1.5

µs

10nA to 1

µA (ratio 1:100)

0.15

µs

10nA to 10

µA (ratio 1:1k)

0.07

µs

10nA to 1mA (ratio 1:100k)

0.06

µs

1mA to 10mA (ratio 1:10)

µs

Decreasing (I1 or I2)

IREF = 1µA

8nA to 240nA (ratio 1:30)

µs

10nA to 100nA (ratio 1:10)

µs

10nA to 1

µA (ratio 1:100)

0.25

µs

10nA to 10

µA (ratio 1:1k)

0.05

µs

10nA to 1mA (ratio 1:100k)

0.03

µs

1mA to 10mA (ratio 1:10)

µs

VOLTAGE REFERENCE

Bandgap Voltage

2.5

Error, Initial

±0.15

±1

vs Temperature

±25

ppm/

°C

vs Supply

VS = +4.8V to +11V

±30

ppm/V

vs Load

IO = ±2mA

±200

ppm/mA

Short-Circuit Current

±10

POWER SUPPLY

Single Supply Operating Range

4.8

Quiescent Current

IO = 0

±10

±15

TEMPERATURE RANGE

Specification, TMIN to TMAX

−5

+75

°C

Operating

−40

+85

°C

Storage

−55

+125

°C

Thermal Resistance,

qJA

°C/W

(1) Log conformity error is 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. Scale factor,

K, equals 0.375V output per decade of input current.

(2) Scale factor of core log function is trimmed to 0.375V output per decade change of input current.

(3) Specified by design.

(4) Worst-case total error for any ratio of I1/I2, as the largest of the two errors, when I, and I2 are considered separately.

(5) Total error includes offset voltage, bias current, gain, and log conformity.

(6) Small signal bandwidth (3dB) and transient response are a function of the level of input current. Smaller input current amplitude results in lower bandwidth.

LOG114 Datasheet(PDF) 6 Page - Burr-Brown (TI)

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