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LOG114_12 Datasheet, PDF (9/29 Pages) Burr-Brown (TI) – Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER | |||
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LOG114
www.ti.com
SBOS301A â MAY 2004 â REVISED MARCH 2007
TYPICAL CHARACTERISTICS: VS = +5V (continued)
All specifications at TA = +25°C, RVLOGOUT = 10kâ¦, VCM = GND, unless otherwise noted. For ac measurements, small signal means up to approximately 10% of dc
level.
0.45
6 DECADE LOG CONFORMITY vs IREF
0.40
+90_C
0.35
+80_C
0.30
+70_C
0.25
0.20
100pA 1nA
â10_C, 0_ C, +25_ C
10nA 100nA 1µA 10µA 100µA 1mA 10mA
IREF (I1)
8 DECADE LOG CONFORMITY (100pA to 3.5mA)
1.6
1.5
+90_ C
1.4
1.3
1.2
1.1
0_ C
1.0
+70_ C
+80_ C
+25_C
â10_ C
0.9
100pA 1nA
10nA 100nA 1µA 10µA 100µA 1mA 10mA
Input Current (I1 or I2)
SMALLâSIGNAL VLOGOUT
20
10mA
10
1µA
1mA
0
100nA
â10
10nA
â20
100µA
â30
10µA
â40
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
0
â5
â10
â15
â20
â25
â30
â35
â40
â45
â50
100
SMALLâSIGNAL AC RESPONSE I1
(10% sine modulation)
1nA
10nA
10µA
100µA
1µA
100nA
1mA
1k
10k
100k
1M
10M 100M
Frequency (Hz)
0
â5
â10
â15
â20
â25
â30
â35
â40
â45
â50
100
SMALLâSIGNAL AC RESPONSE I2
(10% sine modulation)
1nA
10nA
10µA
100µA
1µA
100nA
1mA
1k
10k
100k
1M
10M 100M
Frequency (Hz)
A3 GAIN AND PHASE vs FREQUENCY
160
225
140
120
180
100
80
135
60 Gain
40
Phase
90
20
0
45
â20
â40
0
100
1k
10k
100k
1M
10M 40M
Frequency (Hz)
9
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