Texas Instruments LOG114 Datasheet
SBOS301A − M AY 2004 − REVISED MARCH 2007
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
5
Single-Supply, High-Speed, Precision
LOGARITHMIC AMPLIFIER
LOG114
FEATURES
D ADVANTAGES:
− Tiny for High Density Systems
− Precision on One Supply
− Fast Over Eight Decades
− Fully-Tested Function
D TWO SCALING AMPLIFIERS
D WIDE INPUT DYNAMIC RANGE:
Eight Decades, 100pA to 10mA
D 2.5V REFERENCE
D STABLE OVER TEMPERATURE
D LOW QUIESCENT CURRENT: 10mA
D DUAL OR SINGLE SUPPLY: +5V, +5V
D PACKAGE: Small QFN-16 (4mm x 4mm)
D SPECIFIED TEMPERATURE RANGE:
−5°C to +75°C
APPLICATIONS
D ONET ERBIUM-DOPED FIBER OPTIC
AMPLIFIER (EDFA)
D LASER OPTICAL DENSITY MEASUREMENT
D PHOTODIODE SIGNAL COMPRESSION AMP
D LOG, LOG-RATIO FUNCTION
D ANALOG SIGNAL COMPRESSION IN FRONT
OF ANALOG-TO-DIGITAL (ADC) CONVERTER
D ABSORBANCE MEASUREMENT
DESCRIPTION
The LOG114 is specifically designed for measuring
low-level and wide dynamic range currents in
communications, lasers, medical, and industrial
systems. The device computes the logarithm or log-ratio
of an input current or voltage relative to a reference
current or voltage (logarithmic transimpedance
amplifier).
High precision is ensured over a wide dynamic range of
input signals on either bipolar (±5V) or single (+5V)
supply. Special temperature drift compensation circuitry
is included on-chip. In log-ratio applications, the signal
current may be from a high impedance source such as
a photodiode or resistor in series with a low impedance
voltage source. The reference current is provided by a
resistor in series with a precision internal voltage
reference, photo diode, or active current source.
The output signal at V
LOGOUT
out per decade of input current, which limits the output
so that it fits within a 5V or 10V range. The output can be
scaled and offset with one of the available additional
amplifiers, so it matches a wide variety of ADC input
ranges. Stable dc performance allows accurate
measurement of low-level signals over a wide
temperature range. The LOG114 is specified over a
−5°C to +75°C temperature range and can operate from
−40°C to +85°C.
R
5
R
6
has a scale factor of 0.375V
−
+IN
IN
4
4
1110
LOG114
A
4
A
5
14
−
IN
5
(3)
V
O4
12
+IN
5
13
V
O5
15
NOTES: (1) Thermally dependent R1and R
provide temperature compensation.
(2) V
= 0.375×log(I1/I2).
LOGOUT
(3) VO4=0.375×K×log(I1/I2)
K=1+R6/R5.
(4) Differential A mplifier ( A3) Gai n = 6.2
I1and I2are current inp uts
from a photodiode
or other current source
I
REF
V
LOGOUT
(2)
9
Q
1
Ω
I
1
4
V
CMIN
5
I
2
3
R
REF
16
V
REF
2.5V
A
1
A
2
REF
186 7
REF GND
200
(1)
R
1
Q
2
Ω
200
(1)
R
3
V
V+
Ω
1250
R
2
(4)
A
3
Ω
1250
R
4
−
ComV
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
! !
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Copyright 2004−2007, Texas Instruments Incorporated
3
"#$$%
SBOS301A − M AY 2004 − REVISED MARCH 2007
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage, V+ to V− 12V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current
(2)
(V−) −0.5V to (V+) + 0.5V. . . . .
(2)
±10mA. . . . . . . . . . . . . . . . . . . .
Signal Input Terminals, Voltage
Output Short-Circuit
(3)
Continuous. . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature −40°C to +85°C. . . . . . . . . . . . . . . . . . . . . .
Storage Temperature −55°C to +125°C. . . . . . . . . . . . . . . . . . . . . . .
proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to
complete device failure. Precision integrated circuits may be more
susceptible t o damage because very small parametric changes could
cause the device not to meet its published specifications.
This integrated circuit can be damaged by ESD. Texas
Instruments recommends that all integrated circuits be
handled with appropriate precautions. Failure to observe
Junction Temperature +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ESD Rating (Human Body Model) 2000V. . . . . . . . . . . . . . . . . . . .
(1)
Stresses above these ratings may cause permanent damage.
PRECISION CURRENT MEASUREMENT
PRODUCTS
Exposure to absolute maximum conditions for extended periods
may degrade device reliability. These are stress ratings only , an d
functional operation of the device at these or any other conditions
beyond those specified is not implied.
(2)
Input terminals are diode-clamped to the power-supply rails.
Input signals that can swing more than 0.5V beyond the supply
rails should be current-limited to 10mA or less.
(3)
Short-circuit to ground.
ORDERING INFORMATION
(1)
FEATURES PRODUCT
Logarithmic Transimpedance Amplifier, 5V, Eight Decades LOG114
Logarithmic Transimpedance, 36V, 7.5 Decades LOG112
Resistor-Feedback Transimpedance, 5V, 5.5 Decades
Switched Integrator Transimpedance, Six Decades
Direct Digital Converter, Six Decades
OPA380,
OPA381
IVC102
DDC112
PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING
LOG114 QFN-16 RGV LOG114
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site
at www .ti.com.
PIN CONFIGURATION
T op View
V
REF GND
NC
5
REFVO5
V
16
15 14 13
1
Exposed
2
3
I
2
4
I
1
thermal
diepad on
underside
(Must be
connected to V−)
5
6
−
V
CM IN
V
QFN−16 (4mm x 4mm)
NC = NoConnection
5
IN
−
+IN
78
V+
Com
12
V
O4
11
−
IN
4
10
+IN
4
9
V
LOGOUT
QFN-16
2
"#$$%
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SBOS301A − MAY 2004 − REVISED MARCH 2007
ELECTRICAL CHARACTERISTICS: VS = +5V
Boldface limits apply over the specified temperature range, TA = −5°C to +75°C.
All specifications at TA = +25°C, R
PARAMETER CONDITIONS MIN TYP MAX UNITS
CORE LOG FUNCTION IIN/V
LOG CONFORMITY ERROR
(1)
Initial 1nA to 100µA (5 decades) 0.1 0.2 %
Over Temperature 1nA to 100µA (5 decades) 0.1 0.4 %
TRANSFER FUNCTION (GAIN)
(2)
Initial Scaling Factor 100pA to 10mA 0.375 V/decade
Scaling Factor Error 1nA to 100µA 0.4 ±2.5 %
Over Temperature T
INPUT, A1 and A
2
Offset V oltage V
vs Temperature dV/dT T
vs Power Supply PSRR VS = ±2.25V to ±5.5V 75 400 µV/V
Input Bias Current I
vs Temperature T
Input Common-Mode Voltage Range V
Voltage Noise e
Current Noise i
OUTPUT, A3 (V
Output Offset, V
)
LOGOUT
, Initial V
OSO
Over Temperature T
Full-Scale Output (FSO)
(3)
Gain Bandwidth Product GBW IIN = 1µA 50 MHz
Short-Circuit Current I
Capacitive Load 100 pF
OP AMP, A4 and A
5
Input Offset Voltage V
vs Temperature dV/dT T
vs Supply PSRR VS = ±4.5V to ±5.5V 30 250 µV/V
vs Common-Mode Voltage CMRR 74 dB
Input Bias Current I
Input Offset Current I
Input Voltage Range (V−) (V+) − 2 V
Input Noise f = 0.1Hz to 10Hz 2 µV
f = 1kHz 13 nV/√Hz
Current Noise i
Open-Loop Voltage Gain A
Gain Bandwidth Product GBW 15 MHz
Slew Rate SR 5 V/µs
Settling Time 0.01% t
Rated Output (V−) + 0.5 (V+) − 0.5 V
Short-Circuit Current I
= 10kΩ, VCM = GND, unless otherwise noted.
VLOGOUT
OUT
100pA to 3.5mA (7.5 decades) 0.9 %
1mA to 10mA See Typical Characteristics
100pA to 3.5mA (7.5 decades) 0.5 %
1mA to 10mA See Typical Characteristics %
MIN
+15°C to +50°C 0.7 ±3 %
OS
MIN
B
MIN
CM
n
f = 0.1Hz to 10kHz 3 µVrms
f = 1kHz 30 nV/√Hz
f = 1kHz 4 fA/√Hz
MIN
MIN
OSO
SC
OS
OS
SC
n
B
n
OL
G = −1, 3V Step, CL = 100pF 1.5 µs
S
LOG114
Equation VO = (0.375V) Log (I1/I2) V
0.009 0.017 dB
0.08 dB
0.035 0.21 dB
to T
MAX
1.5 ±3.5 %
±1 ±4 mV
to T
MAX
+15 µV/°C
±5 pA
to T
MAX
Doubles every 10°C
(V−)+1.5 to
(V+)−1.5
±11 ±50 mV
to T
MAX
±15 ±65 mV
(V−) + 0.6 (V+) − 0.6 V
±18 mA
±250 ±1000 µV
to T
MAX
±2 µV/°C
−1 µA
±0.05 µA
2 pA/√Hz
100 dB
+4/−10 mA
V
PP
3
"#$$%
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SBOS301A − MAY 2004 − REVISED MARCH 2007
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, R
PARAMETER UNITSMAXTYPMINCONDITIONS
TOTAL ERROR
FREQUENCY RESPONSE, Core Log
BW, 3dB I1 or I2 = IAC = 10% of IDC value, I
1nA 5 kHz
10nA 12 kHz
100nA 120 kHz
1µA 2.3 MHz
10µA 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 I
Increasing (I1 or I2)
8nA to 240nA (ratio 1:30) 0.7 µs
10nA to 100nA (ratio 1:10) 1.5 µs
10nA to 1µA (ratio 1:100) 0.15 µs
10nA to 10µA (ratio 1:1k) 0.07 µs
10nA to 1mA (ratio 1:100k) 0.06 µs
1mA to 10mA (ratio 1:10) 1 µs
Decreasing (I1 or I2) I
8nA to 240nA (ratio 1:30) 1 µs
10nA to 100nA (ratio 1:10) 2 µs
10nA to 1µA (ratio 1:100) 0.25 µs
10nA to 10µA (ratio 1:1k) 0.05 µs
10nA to 1mA (ratio 1:100k) 0.03 µs
1mA to 10mA (ratio 1:10) 1 µs
VOLTAGE REFERENCE
Bandgap Voltage 2.5 V
Error, Initial ±0.15 ±1 %
vs Temperature ±25 ppm/°C
vs Supply VS = ±4.5V to ±5.5V ±30 ppm/V
vs Load IO = ±2mA ±200 ppm/mA
Short-Circuit Current ±10 mA
POWER SUPPL Y
Dual Supply Operating Range V
Quiescent Current I
TEMPERATURE RANGE
Specification, T
Operating −40 +85 °C
Storage −55 +125 °C
Thermal Resistance, q
(1)
Log conformity error is peak deviation from the best-fit straight line of V
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 I
(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.
(4, 5)
MIN
to T
MAX
JA
= 10kΩ, VCM = GND, unless otherwise noted.
VLOGOUT
(6)
REF
REF
S
Q
, as the largest of the two errors, when I, and I2 are considered separately.
1/I2
LOG114
See Typical Characteristics
= 1µA
REF
= 1µA
= 1µA
±2.4 ±5.5 V
IO = 0 ±10 ±15 mA
−5 +75 °C
62 °C/W
vs Log (I1/I2) curve expressed as a percent of peak-to-peak full-scale output. Scale factor,
O
4
"#$$%
www.ti.com
SBOS301A − MAY 2004 − REVISED MARCH 2007
ELECTRICAL CHARACTERISTICS: VS = +5V
Boldface limits apply over the specified temperature range, TA = −5°C to +75°C.
All specifications at TA = +25°C, R
PARAMETER CONDITIONS MIN TYP MAX UNITS
CORE LOG FUNCTION IIN/V
LOG CONFORMITY ERROR
(1)
Initial 1nA to 100µA (5 decades) 0.1 0.25 %
Over Temperature 1nA to 100µA (5 decades) 0.1 0.4 %
TRANSFER FUNCTION (GAIN)
(2)
Initial Scaling Factor 10nA to 100µA 0.375 V/decade
Scaling Factor Error 1nA to 100µA 0.4 ±2.5 %
Over Temperature T
INPUT, A1 and A
2
Offset V oltage V
vs Temperature dV/dT T
vs Power Supply PSRR VS = +4.5V to +5.5V 300 µV/V
Input Bias Current I
vs Temperature T
Input Common-Mode Voltage Range V
Voltage Noise e
Current Noise i
OUTPUT, A3 (V
Output Offset, V
)
LOGOUT
, Initial V
OSO
Over Temperature T
Full Scale Output (FSO)
(3)
Gain Bandwidth Product GBW IIN = 1µA 50 MHz
Short-Circuit Current I
Capacitive Load 100 pF
OP AMP, A4 and A
5
Input Offset Voltage V
vs Temperature dV/dT T
vs Supply PSRR VS = +4.8V to +5.5V 30 µV/V
vs Common-Mode Voltage CMRR 70 dB
Input Bias Current I
Input Offset Current I
Input Voltage Range (V−) (V+) − 1.5 V
Input Noise f = 0.1Hz to 10Hz 1 µV
f = 1kHz 28 nV/√Hz
Current Noise i
Open-Loop Voltage Gain A
Gain Bandwidth Product GBW 15 MHz
Slew Rate SR 5 V/µs
Settling Time 0.01% t
Rated Output (V−) + 0.5 (V+) − 0.5 V
Short-Circuit Current I
= 10kΩ, VCM = +2.5V, unless otherwise noted.
VLOGOUT
OUT
100pA to 3.5mA (7.5 decades) 0.9 %
1mA to 10mA See Typical Characteristics
100pA to 3.5mA (7.5 decades) 0.5 %
1mA to 10mA See Typical Characteristics
MIN
+15°C to +50°C 0.7 ±3 %
OS
MIN
B
MIN
CM
n
f = 0.1Hz to 10kHz 3 µVrms
f = 1kHz 30 nV/√Hz
n
OSO
f = 1kHz 4 fA/√Hz
MIN
VS = +5V (V−) + 0.6 (V+) − 0.6 V
SC
OS
MIN
B
OS
n
OL
G = −1, 3V Step, CL = 100pF 1.5 µs
S
SC
LOG114
Equation VO = (0.375V) Log (I1/I2) + V
0.009 0.022 dB
0.08 dB
0.0.35 0.21 dB
to T
MAX
0.035 ±3.5 %
±1 ±7 mV
to T
MAX
+30 µV/°C
±5 pA
to T
MAX
Doubles every 10°C
(V−)+1.5 to
(V+)−1.5
±14 ±65 mV
to T
MAX
±18 ±80 mV
±18 mA
±250 ±4000 µV
to T
MAX
±2 µV/°C
−1 µA
±0.05 µA
2 pA/√Hz
100 dB
+4/−10 mA
CM
V
V
PP
5
"#$$%
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SBOS301A − MAY 2004 − REVISED MARCH 2007
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, R
PARAMETER UNITSMAXTYPMINCONDITIONS
TOTAL ERROR
FREQUENCY RESPONSE, Core Log
BW, 3dB I1 or I2 = IAC = 10% of IDC value, I
1nA 5 kHz
10nA 12 kHz
100nA 120 kHz
1µA 2.3 MHz
10µA 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 I
Increasing (I1 or I2)
8nA to 240nA (ratio 1:30) 0.7 µs
10nA to 100nA (ratio 1:10) 1.5 µs
10nA to 1µA (ratio 1:100) 0.15 µs
10nA to 10µA (ratio 1:1k) 0.07 µs
10nA to 1mA (ratio 1:100k) 0.06 µs
1mA to 10mA (ratio 1:10) 1 µs
Decreasing (I1 or I2) I
8nA to 240nA (ratio 1:30) 1 µs
10nA to 100nA (ratio 1:10) 2 µs
10nA to 1µA (ratio 1:100) 0.25 µs
10nA to 10µA (ratio 1:1k) 0.05 µs
10nA to 1mA (ratio 1:100k) 0.03 µs
1mA to 10mA (ratio 1:10) 1 µs
VOLTAGE REFERENCE
Bandgap Voltage 2.5 V
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 mA
POWER SUPPL Y
Single Supply Operating Range V
Quiescent Current I
TEMPERATURE RANGE
Specification, T
Operating −40 +85 °C
Storage −55 +125 °C
Thermal Resistance, q
(1)
Log conformity error is peak deviation from the best-fit straight line of V
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 I
(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.
(4, 5)
MIN
to T
MAX
JA
= 10kΩ, VCM = +2.5V, unless otherwise noted.
VLOGOUT
(6)
REF
REF
S
Q
, as the largest of the two errors, when I, and I2 are considered separately.
1/I2
LOG114
See Typical Characteristics
= 1µA
REF
= 1µA
= 1µA
4.8 11 V
IO = 0 ±10 ±15 mA
−5 +75 °C
62 °C/W
vs Log (I1/I2) curve expressed as a percent of peak-to-peak full-scale output. Scale factor,
O
6
www.ti.com
TYPICAL CHARACTERISTICS: VS = +5V
All specifications at TA = +25°C, R
= 10kΩ, VCM = GND, unless otherwise noted.
VLOGOUT
"#$$%
SBOS301A − MAY 2004 − REVISED MARCH 2007
2.0
NORMALIZED TRANSFER FUNCTION
1.5
1.0
0.5
0
−
0.5
−
1.0
Normalized Output Voltage (V)
−
1.5
−
2.0
−410−310−210−1
10
SCALING FACTOR ERROR (I
40
30
20
+70_C
10
0
Gain Error (%)
−
10
−
20
0_C
+80_C
+90_C
1nA 10nA 100nA 1µA10µA100µA 1mA 10mA100pA
Current Ratio (I1/I2)
+25_C
−10_
C
Input Current (I
110110210
= reference 100pA to 10mA)
2
)
1
ONE CYCLE OF NORMALIZED TRANSFER FUNCTION
0.40
0.35
0.30
0.25
0.20
0.15
0.10
Normalized Output Voltage (V)
0.05
3
4
10
0
110
Current Ratio (I1/I2)
vs I1INPUT (I2=1µA)
V
2.5
LOGOUT
2.0
1.5
1.0
0.5
(V)
0
−
LOGOUT
0.5
V
−
1.0
−
1.5
−
2.0
−
2.5
1nA 10nA 100nA 1µA10µA100µA 1mA 10mA100pA
Input Current (I
)
1
vs I2INPUT (I1=1µA)
V
2.0
LOGOUT
1.5
1.0
0.5
(V)
0
−
0.5
LOGOUT
V
−
1.0
−
1.5
−
2.0
−
2.5
1nA 10nA 100nA 1µA10µA100µA1mA100pA
Input Current (I
)
1
10mA
4
3
2
1
(V)
1µA
100nA
0
LOGOUT
−
1
V
−
2
−
3
−
4
1nA 10nA 100nA 1µA10µA 100µA 1mA 10mA100pA
V
LOGOUT
10nA
10mA
I
REF(I2
vs I
1nA
1mA
REF
100pA
10µA
100µA
)
7
"#$$%
SBOS301A − MAY 2004 − REVISED MARCH 2007
TYPICAL CHARACTERISTICS: VS = +5V (continued)
All specifications at TA = +25°C, R
= 10kΩ, VCM = GND, unless otherwise noted.
VLOGOUT
www.ti.com
100
80
60
40
20
0
−
20
Total Error(mV)
−
40
−
60
I1=10nA
−
80
−
100
100
80
60
40
20
0
−
20
Total Error(mV)
−
40
−
60
−
80
−
100
AVERAGETOTALERRORAT +80_C
I1=10µA
I1=1nA I1= 100nA I1=1µA
400µA 600µA 800µA
AVERAGE TOTALERRORAT−10_C
I1= 10nA
I1=100µA
I1=10µA
400µA 600µA 800µA
I
2
I
2
I1=1mA
I1=100µA
I1=1mA
I1= 100nA
I1=1nA
I1=1µA
100
80
60
40
20
0
−
20
Total Error(mV)
−
40
−
60
−
80
−
100
1mA100µA 200µA
1.4
1.2
1.0
0.8
0.6
Linearity (%)
0.4
0.2
1mA100µA 200µA
0
−
100102030405060708090
AVERAGETOTALERRORAT +25_C
I1=1mA
I1=100µA
I1=1µA
400µA 600µA 800µA
LOG CONFORMITY vsTEMPERATURE
7.5Decade
6Decade
Temperature(_C)
I
2
4Decade
I1=10µA
5 Decade
I1= 1nA, 10nA,
100nA
1mA100µA 200µA
7 Decade
0.09
0.08
0.07
0.06
Linearity (%)
0.05
0.04
4 DECADE LOG CONFORMITY vs I
+90_C
+80_C
1nA 10nA 100nA 1µA10µA 100µA 1mA 10mA100pA
I
)
REF(I1
−10_
C
+25_C
REF
0_C
+70_C
0.40
0.35
0.30
0.25
0.20
0.15
Linearity (%)
0.10
0.05
0
5 DECADE LOG CONFORMITY vs I
+90_C
+80_C
+70_C
−10_
C, 0_C, +25_C
1nA 10nA 100nA 1µA10µA100µA 1mA 10mA100pA
I
)
REF(I1
REF
8
www.ti.com
TYPICAL CHARACTERISTICS: VS = +5V (continued)
All specifications at TA = +25°C, R
level.
VLOGOUT
= 10kΩ, VCM = GND, unless otherwise noted. For ac measurements, small signal means up to approximately 10% of dc
"#$$%
SBOS301A − MAY 2004 − REVISED MARCH 2007
0.45
6 DECADE LOG CONFORMITY vs I
REF
0.40
+90_C
0.35
0.30
Linearity (%)
+80_C
+70_C
Linearity (%)
0.25
−10_
C, 0_C, +25_C
0.20
1nA 10nA 100nA 1µA10µA100µA 1mA 10mA100pA
I
)
REF(I1
20
SMALL−SIGNAL V
LOGOUT
10mA
10
(%)
0
LOGOUT
−
10
−
20
Normalized V
−
30
−
40
10nA
1µA
100nA
100µA
1mA
10µA
Normalized LOG Output (dB)
100 1k 10k 100k 1M 10M 100M10
Frequency (Hz)
8 DECADE LOG CONFORMITY (100pA to 3.5mA)
1.6
1.5
1.4
+90_C
1.3
1.2
1.1
0_C
+70_C
+80_C
1.0
0.9
1nA 10nA 100nA 1µA10µA100µA 1mA 10mA100pA
Input Current (I
SMALL−SIGNALAC RESPONSE I
0
−
5
−
10
−
15
−
20
−
25
−
30
−
35
−
40
−
45
−
50
(10% sine modulation)
1nA 1mA
10nA
100nA
1k 10k 100k 1M 10M 100M100
Frequency (Hz)
1
1µA
or I2)
−10_
10µA
+25_C
C
1
100µA
SMALL−SIGNALAC RESPONSE I
0
−
5
−
10
−
15
−
20
−
25
−
30
−
35
−
40
Normalized LOG Output (dB)
−
45
−
50
(10% sine modulation)
1nA
10nA
1µA
100nA
1k 10k 100k 1M 10M 100M100
Frequency (Hz)
10µA
2
1mA
100µA
GAIN AND PHASE vs FREQUENCY
A
160
3
225
140
120
180
100
80
60
Gain
40
Gain (dB)
Phase
135
90
)
_
Phase(
20
0
−
20
−
40
1M 10M
45
0
40M100 1k 10k 100k
Frequency (Hz)
9
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