LT6232 Linear Technology, LT6232 Datasheet - Page 18

• Manufacturer Part Number: LT6232
• Description: (LT6230 - LT6232) Op Amp Family
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
LT6230/LT6230-10/
LT6231/LT6232
With R
Below this resistance value, the amplifier dominates the
noise, but in the region between 75 and about 3k, the
noise is dominated by the resistor thermal noise. As the
total resistance is further increased beyond 3k, the ampli-
fier noise current multiplied by the total resistance even-
tually dominates the noise.
The product of e
low noise amplifiers. Most low noise amplifiers with low
e
low noise voltage with the lowest possible supply current,
this product can prove to be enlightening. The LT6230/
LT6231/LT6232 have an e
per amplifier, yet it is common to see amplifiers with
similar noise specifications to have e
as 13.5.
18
N
e
have high I
N
= (1.1nV)
S
+ R
G
||R
SUPPLY
2
FB
N
+(1.1nV)
• I
= 75 the total noise of the amplifier is:
U
SUPPLY
current. In applications that require
2
N
U
= 1.55nV/ Hz
• I
is an interesting way to gauge
SUPPLY
W
N
product of only 1.9
• I
SUPPLY
U
as high
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
Enable Pin
The LT6230 includes an ENABLE pin that shuts down the
amplifier to 10 A maximum supply current. The ENABLE
pin must be driven high to within 0.35V of V
the supply current. This can be accomplished with simple
gate logic; however care must be taken if the logic and the
LT6230 operate from different supplies. If this is the case,
then open drain logic can be used with a pull-up resistor
to ensure that the amplifier remains off. See Typical
Characteristic Curves.
The output leakage current when disabled is very low;
however, current can flow into the input protection diodes
D1 and D2 if the output voltage exceeds the input voltage
by a diode drop.
+
to shut down
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