LTC6255/LTC6256/LTC6257

6

Rev E

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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 TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is

unconnected.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOH

Output Swing High (Input Overdrive 30mV),

Measured from V+

No Load

l

24

55

60

mV

mV

ISOURCE = 100µA

l

30

65

75

mV

mV

ISOURCE = 1mA

l

75

135

150

mV

mV

ISC

Output Short-Circuit Current

l

12

3

17

mA

mA

IS

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

ISHDN

Shutdown Pin Current

VSHDN = 0.5V

VSHDN = 1.3V

l

l

–480

–160

–350

–40

nA

nA

VIL

SHDN Input Low Voltage

Disable

l

0.5

V

VIH

SHDN Input High Voltage

Enable

l

1.3

V

tON

Turn-On Time

SHDN Toggle From 0V to 1.8V

150

µs

tOFF

Turn-Off Time

SHDN Toggle From 1.8V to 0V

50

µs

BW

–3dB Closed Loop Bandwidth

AV = 1

4

MHz

GBW

Gain-Bandwidth Product

f = 200kHz

l

2.4

1.8

6

MHz

MHz

TS

Settling Time, 0.3V to 1.5V, Unity Gain

0.1%

0.01%

4

6

µs

µs

SR

Slew Rate

AV = –1, VOUT = 0.3V to 1.5V, CLOAD = 10pF

l

0.9

0.75

1.5

V/µs

V/µs

FPBW

Full Power Bandwidth (Note 8)

1.2VP-P

400

kHz

THD+N

Total Harmonic Distortion and Noise

f = 500Hz, AV = 2, RL = 4kΩ, VOUTP-P = 1V

VIN = 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 • VP-P.