LT1880IS5#TRM Linear Technology, LT1880IS5#TRM Datasheet - Page 9

• Manufacturer Part Number: LT1880IS5#TRM
• Description: IC OPAMP PICO/IN RR/OUT TSOT23-5
• Manufacturer: Linear Technology

Specifications of LT1880IS5#TRM

• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 0.55 V/µs
• Gain Bandwidth Product: 1.1MHz
• Current - Input Bias: 150pA
• Voltage - Input Offset: 40µV
• Current - Supply: 1.5mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 36 V, ±1.35 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• -3db Bandwidth: -
• Other names: LT1880IS5#TRMTR

APPLICATIONS INFORMATION
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.
Figure 2. Extreme Inverting Case: Circuit Operates Properly with
Input Voltage Swing Well Outside Op Amp Supply Rails.
±13.5V SWINGS
WELL OUTSIDE
SUPPLY RAILS
V
IN
V
V
REF
IN
1M, 0.1%
INVERTING: A
OP AMP INPUTS DO NOT MOVE,
BUT ARE FIXED AT DC BIAS
POINT V
INPUT DOES NOT HAVE TO BE
RAIL-TO-RAIL
R
G
REF
100k, 0.1%
+
–
V
= –R
LT1880
+
–
–1.5V
1.5V
F
/R
Figure 1. Some Op Amp Confi gurations Do Not Require
Rail-to Rail Inputs to Achieve Rail-to-Rail Outputs
G
R
F
±1.35V
OUTPUT
SWING
1880 F02
V
IN
NONINVERTING: A
INPUTS MOVE BY AS MUCH AS
V
MORE
INPUT MAY NOT HAVE TO BE
RAIL-TO-RAIL
V
IN
REF
, BUT THE OUTPUT MOVES
R
G
+
–
Precision Photodiode Amplifier
Photodiode amplifiers 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 (I
cable to this demanding task. Figure 3 shows an LT1880
configured as a transimpedance photodiode amplifier.
R
V
F
= 1 +R
F
/R
WORST-CASE
OUTPUT OFFSET
≤196μV AT 25°C
≤262μV 0°C TO 70°C
≤323μV –40°C TO 85°C
PHOTODIODE
G
(SEE TEXT)
Figure 3. Precision Photodiode Amplifi er
B
V
IN
= 150pA typical) and is therefore appli-
NONINVERTING: A
INPUTS MOVE AS MUCH AS
OUTPUT
INPUT MUST BE
RAIL-TO-RAIL FOR OVERALL
CIRCUIT RAIL-TO-RAIL
PERFORMANCE
C
D
+
–
–
+
R
LT1880
F
V
51.1k
C
= +1
–5V
F
5V
1880 F01
LT1880
OUT
1880 F02
1880fa
9