LT6002CDHC datasheet(13/20 Pages) LINER

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LT6000/LT6001/LT6002

600012fa

APPLICATIO S I FOR ATIO

The LT6000/LT6001/LT6002 outputs can swing to within

a respectable 30mV of each rail and draw virtually no

excessive supply current. Figure 3 compares the dual

LT6001 to a competitive part. Both op amps are in unity

gain and their outputs are driven into each rail. The supply

current is shown when the op amps are in linear operation

and when they are driven into each rail. As can be seen

from Figure 3, the supply current of the competitive part

increases 3-fold or 5-fold depending on which rail the

output goes to whereas the LT6001 draws virtually no

excessive current.

Gain

The open-loop gain is almost independent of load when

the output is sourcing current. This optimizes perfor-

mance 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 single LT6000 and the 10-lead dual LT6001 include a

shutdown feature that disables the part reducing quies-

cent current and makes the output high impedance. The

devices can be shut down by bringing the SHDN pin within

0.3V of V–. The amplifiers are guaranteed to shut down if

the SHDN pin is brought within 0.3V of V–. The exact

switchover point will be a function of the supply voltage.

See the Typical Performance Characteristics curves Sup-

ply Current vs Shutdown Pin Voltage. When shut down the

total supply current is about 0.8

µA and the output leakage

current is 20nA (V–

≤ VOUT ≤ V+). For normal operation the

SHDN pin should be tied to V+. It can be left floating,

however, parasitic leakage currents over 1

µA at the SHDN

pin may inadvertently place the part into shutdown.

VIN (V)

–3

–2

–1

–2

60012 F03

VIN

VS = ±2.5V, AV = 1

–

COMPETITIVE

PART

LT6001

VOUT

SUPPLY CURRENT

PER AMPLIFIER

Figure 3. VOUT and ICC vs Input Voltage

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