LTC6257 Linear Technology, LTC6257 Datasheet - Page 12

• Manufacturer Part Number: LTC6257
• Description: 65uA Power Efficient Rail-to-Rail I/O Op Amps
• Manufacturer: Linear Technology

pin Functions
LTC6255/LTC6256/LTC6257
–IN: Inverting Input of the Amplifier. Voltage range of this
pin can go from V
+IN: Non-Inverting Input of Amplifier. This pin has the
same voltage range as –IN.
V
1.8V to 5.25V. Split supplies are possible as long as the
voltage between V
bypass capacitor of 0.1µF as close to the part as possible
should be used between power supply pins or between
supply pins and ground.
siMpliFieD scheMAtic
SHDN

+
V
V
: Positive Power Supply. Typically the voltage is from
+
–
+
Q16
I
2
R6
5M
LOGIC
Q17
+IN
–IN
–
+
– 0.1V to V
and V
Q18
V
V
+
–
ESDD1
ESDD4
–
is between 1.8V and 5.25V. A
V
V
+
–
+
+ 0.1V.
ESDD2
ESDD3
Figure 1. LTC6255/LTC6256/LTC6257 Simplified Schematic
D6
D5
D8
D7
Q19
Q4
Q7
Q3
Q5
Q6
V
It can also be tied to a voltage other than ground as long
as the voltage between V
If it is not connected to ground, bypass it with a capacitor
of 0.1µF as close to the part as possible.
SHDN: Active Low Shutdown. Shutdown threshold is 0.6V
above negative rail. If left unconnected, the amplifier will
be on.
OUT: Amplifier Output. The voltage range extends to within
millivolts of each supply rail.
V
BIAS
–
: Negative Power Supply. It is normally tied to ground.
Q1
+
Q2
I
1
Q10
Q11
Q9
R3
R1
Q12
Q8
+
and V
R4
R2
C
C
+
V
Q13
–
–
R5
OUTPUT BIAS
BUFFER AND
I
is from 1.8V to 5.25V.
3
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C2
C1
625567 F01
Q15
Q14
625567f
ESDD5
ESDD6
OUT