LOG114 Datasheet, PDF (9/30 Pages) Burr-Brown (TI) – Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER

LOG114
www.ti.com
SBOS301A − MAY 2004 − REVISED MARCH 2007
TYPICAL CHARACTERISTICS: V_S = +5V (continued)
All specifications at T_A = +25°C, R_VLOGOUT = 10kΩ, V_CM = GND, unless otherwise noted. For ac measurements, small signal means up to approximately 10% of dc
level.
0.45
6 DECADE LOG CONFORMITY vs I_REF
0.40
+90_C
0.35
+80_C
0.30
+70_C
0.25
0.20
100pA 1nA
−10_C, 0_ C, +25_ C
10nA 100nA 1µA 10µA 100µA 1mA 10mA
I_REF (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
−10_ C
0.9
100pA 1nA
10nA 100nA 1µA 10µA 100µA 1mA 10mA
Input Current (I₁ or I₂)
SMALL−SIGNAL V_LOGOUT
20
10mA
10
1µA
1mA
0
100nA
−10
10nA
−20
100µA
−30
10µA
−40
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
0
−5
−10
−15
−20
−25
−30
−35
−40
−45
−50
100
SMALL−SIGNAL AC RESPONSE I₁
(10% sine modulation)
1nA
10nA
10µA
100µA
1µA
100nA
1mA
1k
10k
100k
1M
10M 100M
Frequency (Hz)
0
−5
−10
−15
−20
−25
−30
−35
−40
−45
−50
100
SMALL−SIGNAL 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
−20
−40
0
100
1k
10k
100k
1M
10M 40M
Frequency (Hz)
9