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參數(shù)資料
| 型號： | LOG114AIRGVRG4 |
| 元件分類： | 對數(shù)放大器 |
| 英文描述： | Single-Supply, High-Speed, Precision LOGARITHMIC AMPLIFIER |
| 中文描述： | 單電源，高速，精密對數(shù)放大器 |
| 文件頁數(shù)： | 3/30頁 |
| 文件大小： | 616K |
| 代理商： | LOG114AIRGVRG4 |
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SBOS301A MAY 2004 REVISED MARCH 2007
www.ti.com
3
ELECTRICAL CHARACTERISTICS: V
S
= 5V
Boldface
limits apply over the specified temperature range,
T
A
= 5
°
C to +75
°
C
.
All specifications at T
A
= +25
°
C, R
VLOGOUT
= 10k
, V
CM
= GND, unless otherwise noted.
LOG114
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
CORE LOG FUNCTION
I
IN
/V
OUT
Equation
V
O
= (0.375V) Log (I
1
/I
2
)
V
LOG CONFORMITY ERROR
(1)
Initial
1nA to 100
μ
A (5 decades)
0.1
0.009
0.9
0.08
0.2
0.017
%
dB
%
dB
100pA to 3.5mA (7.5 decades)
1mA to 10mA
1nA to 100
μ
A (5 decades)
100pA to 3.5mA (7.5 decades)
1mA to 10mA
See Typical Characteristics
0.1
0.5
See Typical Characteristics
Over Temperature
0.4
%
%
%
TRANSFER FUNCTION (GAIN)
(2)
Initial Scaling Factor
Scaling Factor Error
100pA to 10mA
1nA to 100
μ
A
0.375
0.4
0.035
1.5
0.7
V/decade
%
dB
%
%
±
2.5
0.21
±
3.5
±
3
Over Temperature
T
MIN
to T
MAX
+15
°
C to +50
°
C
INPUT, A
1
and A
2
Offset Voltage
vs Temperature
vs Power Supply
Input Bias Current
vs Temperature
Input Common-Mode Voltage Range
V
OS
dV/dT
PSRR
±
1
15
75
±
5
±
4
mV
μ
V/
°
C
μ
V/V
pA
T
MIN
to T
MAX
V
S
=
±
2.25V to
±
5.5V
400
I
B
T
MIN
to T
MAX
Doubles every 10
°
C
(V)+1.5 to
(V+)1.5
3
30
4
V
CM
V
Voltage Noise
e
n
f = 0.1Hz to 10kHz
f = 1kHz
f = 1kHz
μ
Vrms
nV/
√
Hz
fA/
√
Hz
Current Noise
i
n
OUTPUT, A
3
(V
LOGOUT
)
Output Offset, V
OSO
, Initial
Over Temperature
Full-Scale Output (FSO)
(3)
Gain Bandwidth Product
Short-Circuit Current
Capacitive Load
V
OSO
±
11
±
15
±
50
±
65
mV
mV
V
MHz
mA
pF
T
MIN
to T
MAX
(V) + 0.6
(V+) 0.6
GBW
I
SC
I
IN
= 1
μ
A
50
±
18
100
OP AMP, A
4
and A
5
Input Offset Voltage
vs Temperature
vs Supply
vs Common-Mode Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Input Noise f = 0.1Hz to 10Hz
f = 1kHz
Current Noise
Open-Loop Voltage Gain
Gain Bandwidth Product
Slew Rate
Settling Time 0.01%
Rated Output
Short-Circuit Current
V
OS
dV/dT
PSRR
CMRR
±
250
±
2
30
74
1
±
0.05
±
1000
μ
V
T
MIN
to T
MAX
V
S
=
±
4.5V to
±
5.5V
μ
V/
°
C
μ
V/V
dB
μ
A
μ
A
V
μ
V
PP
nV/
√
Hz
pA/
√
Hz
dB
MHz
V/
μ
s
μ
s
V
mA
250
I
B
I
OS
(V)
(V+) 2
2
13
2
100
15
5
1.5
i
n
A
OL
GBW
SR
t
S
G = 1, 3V Step, C
L
= 100pF
(V) + 0.5
(V+) 0.5
I
SC
+4/10
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