LOG114 Datasheet, PDF (4/30 Pages) Burr-Brown (TI) – Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER

LOG114
SBOS301A − MAY 2004 − REVISED MARCH 2007
www.ti.com
ELECTRICAL CHARACTERISTICS: V_S = +5V (continued)
Boldface limits apply over the specified temperature range, T_A = −5°C to +75°C.
All specifications at T_A = +25°C, R_VLOGOUT = 10kΩ, V_CM = GND, unless otherwise noted.
PARAMETER
TOTAL ERROR(4, ⁵⁾
CONDITIONS
LOG114
MIN
TYP
MAX
See Typical Characteristics
UNITS
FREQUENCY RESPONSE, Core Log⁽⁶⁾
BW, 3dB I₁ or I₂ =
1nA
10nA
100nA
1µA
10µA to 1mA (ratio 1:100)
1mA to 3.5mA (ratio 1:3.5)
3.5mA to 10mA (ratio 1:2.9)
Step Response
Increasing (I₁ or I₂)
8nA to 240nA (ratio 1:30)
10nA to 100nA (ratio 1:10)
10nA to 1µA (ratio 1:100)
10nA to 10µA (ratio 1:1k)
10nA to 1mA (ratio 1:100k)
1mA to 10mA (ratio 1:10)
Decreasing (I₁ or I₂)
8nA to 240nA (ratio 1:30)
10nA to 100nA (ratio 1:10)
10nA to 1µA (ratio 1:100)
10nA to 10µA (ratio 1:1k)
10nA to 1mA (ratio 1:100k)
1mA to 10mA (ratio 1:10)
I_AC = 10% of I_DC value, I_REF = 1µA
I_REF = 1µA
I_REF = 1µA
5
12
120
2.3
>5
>5
>5
0.7
1.5
0.15
0.07
0.06
1
1
2
0.25
0.05
0.03
1
kHz
kHz
kHz
MHz
MHz
MHz
MHz
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
VOLTAGE REFERENCE
Bandgap Voltage
Error, Initial
vs Temperature
vs Supply
vs Load
Short-Circuit Current
V_S = ±4.5V to ±5.5V
I_O = ±2mA
2.5
±0.15
±25
±30
±200
±10
V
±1
%
ppm/°C
ppm/V
ppm/mA
mA
POWER SUPPLY
Dual Supply Operating Range
V_S
Quiescent Current
I_Q
I_O = 0
±2.4
±5.5
V
±10
±15
mA
TEMPERATURE RANGE
Specification, T_MIN to T_MAX
Operating
Storage
Thermal Resistance, q_JA
−5
+75
°C
−40
+85
°C
−55
+125
°C
62
°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.}
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