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부품번호 LOG112 기능
기능 Precision/ High-Speed Transimpedance Amplifier
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LOG112 데이터시트, 핀배열, 회로
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
Precision, High-Speed
Transimpedance Amplifier
FEATURES
D > 1MHz TRANSIMPEDANCE BANDWIDTH
D EXCELLENT LONG-TERM VOS STABILITY
D BIAS CURRENT: 50pA (max)
D OFFSET VOLTAGE: 25µV (max)
D INPUT CURRENT RANGE: 10nA to 1mA
D DRIFT: 0.1µV/°C (max)
D GAIN BANDWIDTH: 90MHz
D QUIESCENT CURRENT: 6.5mA
D SUPPLY RANGE: 2.7V to 5.5V
D SINGLE AND DUAL VERSIONS
D MicroSize PACKAGE: MSOP-8
APPLICATIONS
D PHOTODIODE MONITORING
D PRECISION I/V CONVERSION
D OPTICAL AMPLIFIERS
D CAT-SCANNER FRONT-END
2
Photodiode
1M
3
RF
+5V
7
OPA380
VOUT
6 (0V to 4.4V)
67pF
100k
RP
(Optional
Pulldown
Resistor)
5V
75pF
4
DESCRIPTION
The OPA380 family of transimpedance amplifiers provides
high-speed (90MHz Gain Bandwidth [GBW]) operation, with
extremely high precision, excellent long-term stability, and
very low 1/f noise. It is ideally suited for high-speed
photodiode applications. The OPA380 features an offset
voltage of 25µV, offset drift of 0.1µV/°C, and bias current of
50pA. The OPA380 far exceeds the offset, drift, and noise
performance that conventional JFET op amps provide.
The signal bandwidth of a transimpedance amplifier depends
largely on the GBW of the amplifier and the parasitic
capacitance of the photodiode, as well as the feedback
resistor. The 90MHz GBW of the OPA380 enables a trans-
impedance bandwidth of > 1MHz in most configurations. The
OPA380 is ideally suited for fast control loops for power level
on an optical fiber.
As a result of the high precision and low-noise characteristics
of the OPA380, a dynamic range of 5 decades can be
achieved. This capability allows the measurement of signal
currents in the order of 10nA, and up to 1mA in a single I/V
conversion stage. In contrast to logarithmic amplifiers, the
OPA380 provides very wide bandwidth throughout the full
dynamic range. By using an external pulldown resistor to
–5V, the output voltage range can be extended to include 0V.
The OPA380 (single) is available in MSOP-8 and SO-8
packages. The OPA2380 (dual) is available in the
miniature MSOP-8 package. They are specified from
–40°C to +125°C.
OPA380 RELATED DEVICES
PRODUCT
OPA300
OPA350
OPA335
OPA132
OPA656/7
LOG112
LOG114
IVC102
FEATURES
150MHz CMOS, 2.7V to 5.5V Supply
500µV VOS, 38MHz, 2.5V to 5V Supply
10µV VOS, Zero-Drift, 2.5V to 5V Supply
16MHz GBW, Precision FET Op Amp, ±15V
230MHz, Precision FET, ±5V
LOG amp, 7.5 decades, ±4.5V to ±18V Supply
LOG amp, 7.5 decades, ±2.25V to ±5.5V Supply
Precision Switched Integrator
DDC112
Dual Current Input, 20-Bit ADC
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2003-2004, Texas Instruments Incorporated
www.ti.com




LOG112 pdf, 반도체, 판매, 대치품
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
www.ti.com
ELECTRICAL CHARACTERISTICS: OPA2380 (DUAL), VS = 2.7V to 5.5V
Boldface limits apply over the temperature range, TA = −40°C to +125°C.
All specifications at TA = +25°C, RL = 2kconnected to VS/2, and VOUT = VS/2, unless otherwise noted.
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
Drift
vs Power Supply
Over Temperature
Long-Term Stability(1)
Channel Separation, dc
VOS
dVOS/dT
PSRR
CONDITION
VS = +5V, VCM = 0V
VS = +2.7V to +5.5V, VCM = 0V
VS = +2.7V to +5.5V, VCM = 0V
MIN
OPA2380
TYP
4
0.03
2.4
See Note (1)
1
MAX
25
0.1
10
10
UNITS
µV
µV/°C
µV/V
µV/V
µV/V
INPUT BIAS CURRENT
Input Bias Current, Inverting Input
Noninverting Input
Over Temperature
IB
IB
VCM = VS/2
VCM = VS/2
3 ±50
3 ±200
Typical Characteristics
pA
pA
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 10kHz
Input Voltage Noise Density, f > 1MHz
Input Current Noise Density, f = 10kHz
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
INPUT IMPEDANCE
Differential Capacitance
Common-Mode Resistance and Inverting Input
Capacitance
en
en
en
in
VCM
CMRR
VS = +5V, VCM = 0V
VS = +5V, VCM = 0V
VS = +5V, VCM = 0V
VS = +5V, VCM = 0V
(V−) < VCM < (V+) – 1.8V
3 µVPP
67 nV/Hz
5.8 nV/Hz
10 fA/Hz
V−
(V+) − 1.8V
V
95 105
dB
1.1
1013 || 3
pF
|| pF
OPEN-LOOP GAIN
Open-Loop Voltage Gain
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.01%(3)
Overload Recovery Time(4), (5)
OUTPUT
Voltage Output Swing from Positive Rail
Voltage Output Swing from Negative Rail
Voltage Output Swing from Positive Rail
Voltage Output Swing from Negative Rail
Output Current
Short-Circuit Current
Capacitive Load Drive
Open-Loop Output Impedance
POWER SUPPLY
Specified Voltage Range
Quiescent Current (per amplifier)
Over Temperature
AOL
GBW
SR
tS
0.12V < VO < (V+) − 0.7V, VS = 5V, VCM = VS/2
0.12V < VO < (V+) − 0.6V, VS = 5V, VCM = VS/2,
TA = -40°C to +85°C
0V < VO < (V+) − 0.7V, VS = 5V, VCM = 0V,
RP = 2kto −5V(2)
0V < VO < (V+) − 0.6V, VS = 5V, VCM = 0V,
RP = 2kto −5V(2), TA = -40°C to +85°C
CL = 50pF
G = +1
VS = +5V, 4V Step, G = +1
VIN G = > VS
IOUT
ISC
CLOAD
RO
RL = 2k
RL = 2k
RP = 2kto −5V(2)
RP = 2kto −5V(2)
f = 1MHz, IO = 0A
VS
IQ IO = 0A
110 130
110 130
106 120
106 120
90
80
2
100
400 600
80 120
400 600
−20 0
See Typical Characteristics
150
See Typical Characteristics
40
2.7 5.5
7.5 9.5
10
dB
dB
dB
dB
MHz
V/µs
µs
ns
mV
mV
mV
mV
mA
V
mA
mA
TEMPERATURE RANGE
Specified and Operating Range
Storage Range
Thermal Resistance
MSOP-8
qJA
−40
+125
°C
−65
+150
°C
150 °C/W
(1) 300-hour life test at 150°C demonstrated randomly distributed variation approximately equal to measurement repeatability of 1µV.
(2) Tested with output connected only to RP, a pulldown resistor connected between VOUT and −5V, as shown in Figure 5. See also applications section, Achieving
Output Swing to Ground.
(3) Transimpedance frequency of 1MHz.
(4) Time required to return to linear operation.
(5) From positive rail.
4

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LOG112 전자부품, 판매, 대치품
www.ti.com
OPA380
OPA2380
SBOS291E − NOVEMBER 2003 − REVISED NOVEMBER 2004
TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued)
All specifications at TA = +25°C, RL = 2kconnected to VS/2, and VOUT = VS/2, unless otherwise noted.
Circuit for Transimpedance Amplifier Characteristic curves on this page.
CF
RF
CSTRAY
CDIODE
OPA380
TRANSIMPEDANCE AMP CHARACTERISTIC
140
130 RF = 10M
CDIODE = 100pF
120
110 RF = 1M
100
CF = 0.5pF
90 RF = 100k
80
CF = 2pF
70 RF = 10k
60
CF = 5pF
50 RF = 1k
40
CF = 18pF
30 CSTRAY (parasitic) = 0.2pF
20
100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
TRANSIMPEDANCE AMP CHARACTERISTIC
140
130 RF = 10M
CDIODE = 50pF
120
110 RF = 1M
100
CF = 0.5pF
90 RF = 100k
80
CF = 1.5pF
70 RF = 10k
60
CF = 4pF
50 RF = 1k
40
CF = 12pF
30 CSTRAY (parasitic) = 0.2pF
20
100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
TRANSIMPEDANCE AMP CHARACTERISTIC
140
130 RF = 10M
CDIODE = 20pF
120
110 RF = 1M
100
90 RF = 100k
80
70 RF = 10k
CF = 1pF
CF = 2.5pF
60
50 RF = 1k
CF = 7pF
40 CSTRAY (parasitic) = 0.2pF
30
100 1k 10k 100k 1M 10M
100M
Frequency (Hz)
TRANSIMPEDANCE AMP CHARACTERISTIC
140
130 RF = 10M
CDIODE = 10pF
120
110 RF = 1M
100
90 RF = 100k
80
70 RF = 10k
CF = 0.5pF
CF = 2pF
60
50 RF = 1k
CF = 5pF
40 CSTRAY (parasitic) = 0.2pF
30
100 1k 10k 100k 1M 10M
100M
Frequency (Hz)
TRANSIMPEDANCE AMP CHARACTERISTIC
140
130 RF = 10M
CDIODE = 1pF
120
110 RF = 1M
100
90 RF = 100k
80
70 RF = 10k
60
CF = 0.5pF
RF = 1k
CF = 1pF
50
CSTRAY (parasitic) = 0.2pF
40
100 1k 10k 100k
CF = 2.5pF
1M 10M
Frequency (Hz)
100M
7

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