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参数资料
| 型号： | LT1793IS8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Noise, Picoampere Bias Current, JFET Input Op Amp |
| 中文描述： | OP-AMP, 4800 uV OFFSET-MAX, 3.1 MHz BAND WIDTH, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件页数： | 8/12页 |
| 文件大小： | 162K |
| 代理商： | LT1793IS8 |
8
LT1793
U
S
A
with temperature will occur when the device is nulled with
a potentiometer ranging from 10k to 200k. Finer adjust-
ments can be made with resistors in series with the
potentiometer (Figure 2b).
O
PPLICATI
U
U
voltage noise, the thermal noise of the transducer, and the
op amp’s input bias current noise times the transducer
impedance.
Figure 3 shows total input voltage noise
versus source resistance. In a low source resistance
(<5k) application the op amp voltage noise will dominate
the total noise. This means the LT1793 is superior to
most JFET op amps. Only the lowest noise bipolar op
amps have the advantage at low source resistances. As
the source resistance increases from 5k to 50k, the
LT1793 will match the best bipolar op amps for noise
perfor
mance, since the thermal noise of the transducer
(4kTR) begins to dominate the total noise. A further
increase in source resistance, above 50k, is where the op
amp’s current noise component (2qI
B
R
2
) will eventually
dominate the total noise. At these high source resis-
tances, the LT1793 will out perform the lowest noise
bipolar op amps due to the inherently low current noise of
FET input op amps. Clearly, the LT1793 will extend the
range of high impedance transducers that can be used for
high signal-to-noise ratios. This makes the LT1793 the
best choice for high impedance, capacitive transducers.
Optimization Techniques for Charge Amplifiers
The high input impedance JFET front end makes the
LT1793 suitable in applications where very high charge
sensitivity is required. Figure 4 illustrates the LT1793 in its
inverting and noninverting modes of operation. A charge
amplifier is shown in the inverting mode example; the gain
depends on the principal of charge conservation at the
input of the LT1793. The charge across the transducer
capacitance C
S
is transferred to the feedback capacitor C
F
Amplifying Signals from High Impedance Transducers
The low voltage and current noise offered by the LT1793
makes it useful in a wide range of applications, especially
where high impedance, capacitive transducers are used
such as hydrophones, precision accelerometers and
photodiodes. The total output noise in such a system is
the gain times the RMS sum of the op amp’s input referred
Figure 3. Comparison of LT1793 and LT1007 Total Output
1kHz Voltage Noise vs Source Resistance
Figure 4. Inverting and Noninverting Gain Configurations
SOURCE RESISTANCE (
)
100
1
10
1k
10k
1k
100M
1G
1793 F03
100k
100
10M
10k
1M
I
√
H
z
V
n
= A
V
√
V
n2(OP AMP)
+ 4kTR
+ 2
q
I
B
R
2
SOURCE RESISTANCE = 2R
S
= R
* PLUS RESISTOR
PLUS RESISTOR
1000pF CAPACITOR
RESISTOR NOISE ONLY
LT1793
LT1007*
LT1007
LT1793
LT1007
LT1793*
–
+
C
S
C
S
R
S
R
S
V
O
–
+
R2
OUTPUT
R
B
C
B
R1
C
S
R
S
C
B
C
S
R
B
= R
S
R
S
> R1
OR R2
TRANSDUCER
–
+
OUTPUT
C
F
C
B
R
B
C
B
= C
F
C
S
R
B
= R
F
R
S
Q = CV;
R
F
C
S
R
S
TRANSDUCER
1793 F04
= I = C
dQ
dt
dV
dt
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1793IS8#PBF | 功能描述:IC OPAMP PREC JFET LOWNOIS 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:100 系列:- 放大器类型:通用 电路数:1 输出类型:- 转换速率:0.2 V/µs 增益带宽积:- -3db带宽:- 电流 - 输入偏压:100pA 电压 - 输入偏移:30µV 电流 - 电源:380µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):±2 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:管件 |
| LT1793IS8#TR | 功能描述:IC OPAMP PREC JFET LONOISE 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1793IS8#TRPBF | 功能描述:IC OPAMP PREC JFET LOWNOIS 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1794 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 500mA, 200MHz xDSL Line Driver Amplifier |
| LT1794CFE | 功能描述:IC AMP XDSL LINE DRIVER 20TSSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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