LT1673CS8#PBF Linear Technology, LT1673CS8#PBF Datasheet - Page 8

• Manufacturer Part Number: LT1673CS8#PBF
• Description: IC OPAMP R-R IN/OUT DUAL 8-SOIC
• Manufacturer: Linear Technology
• Series: Over-The-Top®r

Specifications of LT1673CS8#PBF

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 0.005 V/µs
• Gain Bandwidth Product: 12kHz
• Current - Input Bias: 25pA
• Voltage - Input Offset: 200µV
• Current - Supply: 1.9µA
• Current - Output / Channel: 1.5mA
• Voltage - Supply, Single/dual (±): 2.2 V ~ 36 V, ±1.1 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Response
LT1672/LT1673/LT1674
APPLICATIO S I FOR ATIO
Start-Up Characteristics
Micropower op amps are sometimes not micropower
during start-up, wreaking havoc on low current supplies.
In the worst case, there may not be enough supply current
available to take the system up to nominal voltages. Figure
1 is a graph of LT1673 supply current vs supply voltage
for the three limit cases of input offset that could occur
during start-up. The circuits are shown in Figure 2. One
circuit creates a positive offset, forcing the output to come
up saturated high. Another circuit creates a negative
offset, forcing the output to come up saturated low, while
the last brings up the output at half supply. In all cases, the
supply current is well behaved. Supply current is highest
with the output forced high, so if one amplifier is unused,
it is best to force the output low or at half supply.
8
V
C
A
S
L
V
= 15V
= 100pF
= 5
Figure 1. Start-Up Characteristics
5
4
3
2
1
0
0
U
1
TOTAL SUPPLY VOLTAGE (V)
U
2
W
OUTPUT HIGH
1672/3/4 G19
OUTPUT LOW
U
3
OUTPUT V
W
4
1672/3/4 FO1
S
Small-Signal Response
V
C
A
/2
S
L
V
= 5V
= 100pF
= 5
5
U
Reverse Battery
The LT1672/LT1673/LT1674 are protected against reverse
battery voltages up to 18V. In the event a reverse battery
condition occurs, the supply current is typically less than
100nA (inputs grounded and outputs open). For typical
single supply applications with ground referred loads and
feedback networks, no other precautions are required. If
the reverse battery condition results in a negative voltage
at either the input pins or output pin, the current into the
pin should be limited by an external resistor to less than
10mA.
Inputs
While the LT1672/LT1673/LT1674 will function normally
with its inputs taken above the positive supply, the com-
mon mode range does not extend beyond approximately
300mV below the negative supply at room temperature.
+
–
OUTPUT HIGH
V
V
+
–
Figure 2. Circuits for Start-Up Characteristics
1672/3/4 G20
–
Large-Signal Response
+
OUTPUT LOW
V
C
A
S
L
V
= 5V
= 100pF
= 5
V
V
+
–
200k
+
–
OUTPUT AT V
V
V
+
–
820k
S
/2
16/2/3/4 F02
1672/3/4 G21