参数资料
型号: LT1880CS5#TRMPBF
厂商: Linear Technology
文件页数: 12/12页
文件大小: 0K
描述: IC OPAMP PICO/IN RR/OUT TSOT23-5
标准包装: 1
放大器类型: 通用
电路数: 1
输出类型: 满摆幅
转换速率: 0.55 V/µs
增益带宽积: 1.1MHz
电流 - 输入偏压: 150pA
电压 - 输入偏移: 40µV
电流 - 电源: 1.5mA
电流 - 输出 / 通道: 25mA
电压 - 电源,单路/双路(±): 2.7 V ~ 36 V,±1.35 V ~ 18 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: SOT-23-5 细型,TSOT-23-5
供应商设备封装: TSOT-23-5
包装: 标准包装
产品目录页面: 1320 (CN2011-ZH PDF)
其它名称: LT1880CS5#TRMPBFDKR
LT1880
9
1880fa
APPLICATIONS INFORMATION
+
VREF
VIN
RG
RF
INVERTING: AV = –RF/RG
OP AMP INPUTS DO NOT MOVE,
BUT ARE FIXED AT DC BIAS
POINT VREF
INPUT DOES NOT HAVE TO BE
RAIL-TO-RAIL
+
VREF
VIN
RG
RF
NONINVERTING: AV = 1 +RF/RG
INPUTS MOVE BY AS MUCH AS
VIN, BUT THE OUTPUT MOVES
MORE
INPUT MAY NOT HAVE TO BE
RAIL-TO-RAIL
+
VIN
NONINVERTING: AV = +1
INPUTS MOVE AS MUCH AS
OUTPUT
INPUT MUST BE
RAIL-TO-RAIL FOR OVERALL
CIRCUIT RAIL-TO-RAIL
PERFORMANCE
1880 F01
Figure 1. Some Op Amp Congurations Do Not Require
Rail-to Rail Inputs to Achieve Rail-to-Rail Outputs
The circuit of Figure 2 shows an extreme example of the
inverting case. The input voltage at the 1M resistor can
swing ±13.5V and the LT1880 will output an inverted,
divided-by-ten version of the input voltage. The input
accuracy is limited by the resistors to 0.2%. Output
referred, this error becomes 2.7mV. The 40μV input offset
voltage contribution, plus the additional error due to input
bias current times the ~100k effective source impedance,
contribute only negligibly to error.
Precision Photodiode Amplier
Photodiode ampliers usually employ JFET op amps be-
cause of their low bias current; however, when precision
is required, JFET op amps are generally inadequate due to
their relatively high input offset voltage and drift. The
LT1880 provides a high degree of precision with very low
bias current (IB = 150pA typical) and is therefore appli-
cable to this demanding task. Figure 3 shows an LT1880
congured as a transimpedance photodiode amplier.
1.5V
–1.5V
100k, 0.1%
1M, 0.1%
VIN
±1.35V
OUTPUT
SWING
±13.5V SWINGS
WELL OUTSIDE
SUPPLY RAILS
+
LT1880
1880 F02
+
OUT
CF
RF 51.1k
5V
–5V
CD
PHOTODIODE
(SEE TEXT)
LT1880
WORST-CASE
OUTPUT OFFSET
≤196μV AT 25°C
≤262μV 0°C TO 70°C
≤323μV –40°C TO 85°C
1880 F02
Figure 2. Extreme Inverting Case: Circuit Operates Properly with
Input Voltage Swing Well Outside Op Amp Supply Rails.
Figure 3. Precision Photodiode Amplier
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