VREF VIN
參數(shù)資料
型號: LT1880CS5#TRM
廠商: Linear Technology
文件頁數(shù): 12/12頁
文件大?。?/td> 0K
描述: IC OPAMP PICO/IN RR/OUT TSOT23-5
標(biāo)準(zhǔn)包裝: 1
放大器類型: 通用
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 0.55 V/µs
增益帶寬積: 1.1MHz
電流 - 輸入偏壓: 150pA
電壓 - 輸入偏移: 40µV
電流 - 電源: 1.5mA
電流 - 輸出 / 通道: 25mA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 36 V,±1.35 V ~ 18 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: SOT-23-5 細(xì)型,TSOT-23-5
供應(yīng)商設(shè)備封裝: TSOT-23-5
包裝: 剪切帶 (CT)
其它名稱: LT1880CS5
LT1880CS5#TRMCT
LT1880CS5-ND
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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