Datasheet

LTC6255/LTC6256/LTC6257
12
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pin Functions
–IN: Inverting Input of the Amplifier. Voltage range of this
pin can go from V
–
– 0.1V to V
+
+ 0.1V.
+IN: Non-Inverting Input of Amplifier. This pin has the
same voltage range as –IN.
V
+
: Positive Power Supply. Typically the voltage is from
1.8V to 5.25V. Split supplies are possible as long as the
voltage between V
+
and V
–
is between 1.8V and 5.25V. A
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.
V
–
: Negative Power Supply. It is normally tied to ground.
It can also be tied to a voltage other than ground as long
as the voltage between V
+
and V
–
is from 1.8V to 5.25V.
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.
siMpliFieD scheMAtic
Figure 1. LTC6255/LTC6256/LTC6257 Simplified Schematic
+
I
2
Q17 Q18
ESDD4
–IN
+IN
V
–
Q3Q4
Q6
Q8
R2
R4
Q9
Q12
R1
R3
R6
5M
Q7
Q16
ESDD3
V
+
ESDD1
V
+
ESDD2
V
–
V
–
V
+
SHDN
V
–
D8
D7
ESDD5
ESDD6
D6
D5
Q2
Q5 V
BIAS
Q1
+
I
1
I
3
Q19
R5
Q11
Q10
Q13
Q15
OUT
C2
C1
+
Q14
C
C
BUFFER AND
OUTPUT BIAS
625567 F01
LOGIC