LT6235 Linear Technology, LT6235 Datasheet - Page 18

• Manufacturer Part Number: LT6235
• Description: (LT6233 - LT6235) Op Amp Family
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
LT6233/LT6233-10/
LT6234/LT6235
With R
amplifier is:
Below this resistance value, the amplifier dominates the
noise, but in the region between 225 and about 30k, the
noise is dominated by the resistor thermal noise. As the
total resistance is further increased beyond 30k, the
amplifier noise current multiplied by the total resistance
eventually 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 LT6233/
LT6234/LT6235 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
= (1.9nV)
S
+ R
SUPPLY
G
2
N
||R
+(1.9nV)
• I
FB
U
SUPPLY
current. In applications that require
= 225
2
N
U
= 2.69nV/ Hz
• I
is an interesting way to gauge
SUPPLY
the total noise of the
W
N
product of only 2.1
• I
SUPPLY
U
as high
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
Enable Pin
The LT6233 and LT6233-10 include an ENABLE pin that
shuts down the amplifier to 10 A maximum supply cur-
rent. The ENABLE pin must be driven high to within 0.35V
of V
accomplished with simple gate logic; however care must
be taken if the logic and the LT6233 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 the supply current. This can be
623345f