LT1782HS6 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1782HS6 Datasheet PDF : 16 Pages
| |||
LT1782
APPLICATIONS INFORMATION
sourcing current is reduced to 10mA at 3V total supplies
as noted in the Electrical Characteristics section.
The LT1782 is internally compensated to drive at least
600pF of capacitance under any output loading condi-
tions. A 0.22µF capacitor in series with a 150Ω resistor
between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF, at
all output currents.
Distortion
There are two main contributors to distortion in op amps:
output crossover distortion as the output transitions from
sourcing to sinking current, and distortion caused by non-
linear common mode rejection. If the op amp is operating
inverting, there is no common mode induced distortion.
If the op amp is operating in the PNP input stage (input is
not within 0.8V of V+), the CMRR is very good, typically
100dB. When the LT1782 switches between input stages,
there is significant nonlinearity in the CMRR. Lower load
resistance increases the output crossover distortion but
has no effect on the input stage transition distortion. For
lowest distortion, the LT1782 should be operated single
supply, with the output always sourcing current and with
the input voltage swing between ground and (V+ – 0.8V).
See the Typical Performance Characteristics curves,
“Total Harmonic Distortion + Noise vs Ouput Voltage
Amplitude.”
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes performance
in single supply applications where the load is returned to
ground. The typical performance curve of open-loop gain
for various loads shows the details.
Shutdown
The 6-lead part includes a shutdown feature that disables
the part, reducing quiescent current and making the output
high impedance. The part can be shut down by bringing
the SHDN pin 1.2V or more above V–. When shut down,
the supply current is about 5µA and the output leakage
current is less than 1µA (V– ≤ VOUT ≤ V+). In normal opera-
tion, the SHDN pin can be tied to V– or left floating. See
the Typical Performance Characteristics curves, “Supply
Current vs Shutdown Pin Voltage.”
SIMPLIFIED SCHEMATIC
SHDN
J1
Q26
Q1
R1
30k
R2
6k
Q4 –IN
+
2µA
R3
6k
+IN
Q2
D1
Q7 Q8
Q11 Q12
Q9
Q10
Q13
Q3
D3
V+
Q22
Q15
Q14
Q19
Q17
Q20
OUT
Q16 Q18
Q21
Q25 Q23
Q24 Q5
Q6
D4 D5
R4
R5
40k
40k
V–
1782 SS
1782fc
12
Share Link: 