Datasheet

LTC6255/LTC6256/LTC6257
6
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Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The inputs are protected by back-to-back diodes as well as ESD
protection diodes to each power supply. If the differential input voltage
exceeds 3.6V or the input extends more than 500mV beyond the power
supply, the input current should be limited to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 4: The LTC6255C/LTC6256C/LTC6257C and LTC6255I/LTC6256I/
LTC6257I are guaranteed functional over the temperature range of –40°C
to 85°C. The LTC6255H/LTC6256H/LTC6257H are guaranteed functional
over the temperature range of –40°C to 125°C.
1.8V electricAl chArActeristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. V
SUPPLY
= 1.8V, V
CM
= V
OUT
= 0.4V, C
L
= 10pF, V
SHDN
is
unconnected.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OH
Output Swing High (Input Overdrive 30mV),
Measured from V
+
No Load
l
24 55
60
mV
mV
I
SOURCE
= 100µA
l
30 65
75
mV
mV
I
SOURCE
= 1mA
l
75 135
150
mV
mV
I
SC
Output Short-Circuit Current
l
12
3
17 mA
mA
I
S
Supply Current per Amplifier
l
53
35
60 68
83
µA
µA
Supply Current in Shutdown
l
1.4 2.0
3.0
µA
µA
I
SHDN
Shutdown Pin Current V
SHDN
= 0.5V
V
SHDN
= 1.3V
l
l
–480
–160
–350
–40
nA
nA
V
IL
SHDN Input Low Voltage Disable
l
0.5 V
V
IH
SHDN Input High Voltage Enable
l
1.3 V
t
ON
Turn-On Time SHDN Toggle From 0V to 1.8V 150 µs
t
OFF
Turn-Off Time SHDN Toggle From 1.8V to 0V 50 µs
BW –3dB Closed Loop Bandwidth A
V
= 1 4 MHz
GBW Gain-Bandwidth Product f = 200kHz
l
2.4
1.8
6 MHz
MHz
T
S
Settling Time, 0.3V to 1.5V, Unity Gain 0.1%
0.01%
4
6
µs
µs
SR Slew Rate A
V
= –1, V
OUT
= 0.3V to 1.5V, C
LOAD
= 10pF
l
0.9
0.75
1.5 V/µs
V/µs
FPBW Full Power Bandwidth (Note 8) 1.2V
P-P
400 kHz
THD+N Total Harmonic Distortion and Noise f = 500Hz, A
V
= 2, R
L
= 4kΩ, V
OUTP-P
= 1V
V
IN
= 0.25V to 0.75V
0.006
84
%
dB
Note 5: The LTC6255C/LTC6256C/LTC6257C are guaranteed to meet
the specified performance from 0°C to 70°C. The LTC6255C/LTC6256C/
LTC6257C are designed, characterized and expected to meet specified
performance from –40°C to 85°C but are not tested or QA sampled at
these temperatures. The LTC6255I/LTC6256I/LTC6257I are guaranteed
to meet specified performance from –40°C to 85°C. The LTC6255H/
LTC6256H/LTC6257H are guaranteed to meet specified performance
from –40°C to 125°C.
Note 6: Thermal resistance varies with the amount of PC board metal
connected to the package. The specified values are for short traces
connected to the leads.
Note 7: The input bias current is the average of the currents through the
positive and negative input pins.
Note 8: Full power bandwidth is calculated from the slew rate FPBW =
SR/π • V
P-P
.