LT1056 LINER [Linear Technology], LT1056 Datasheet - Page 7

• Manufacturer Part Number: LT1056
• Description: Precision, High Speed, JFET Input Operational Amplifiers
• Manufacturer: LINER [Linear Technology]

APPLICATIONS
Teflon is a trademark of Dupont.
The LT1055/LT1056 may be inserted directly into LF155A/
LT355A, LF156A/LT356A, OP-15 and OP-16 sockets. Off-
set nulling will be compatible with these devices with the
wiper of the potentiometer tied to the positive supply.
No appreciable change in offset voltage drift with tempera-
ture will occur when the device is nulled with a potentiom-
eter, R
The LT1055/LT1056 can also be used in LF351, LF411,
AD547, AD611, OPA-111, and TL081 sockets, provided
that the nulling cicuitry is removed. Because of the LT1055/
LT1056’s low offset voltage, nulling will not be necessary
in most applications.
Achieving Picoampere/Microvolt Performance
In order to realize the picoampere-microvolt level accu-
racy of the LT1055/LT1056 proper care must be exer-
cised. For example, leakage currents in circuitry external
to the op amp can significantly degrade performance. High
quality insulation should be used (e.g. Teflon™, Kel-F);
cleaning of all insulating surfaces to remove fluxes and
other residues will probably be required. Surface coating
may be necessary to provide a moisture barrier in high
humidity environments.
Board leakage can be minimized by encircling the input
circuitry with a guard ring operated at a potential close to
that of the inputs: in inverting configurations the guard
ring should be tied to ground, in noninverting connnections
to the inverting input at pin 2. Guarding both sides of the
printed circuit board is required. Bulk leakage reduction
depends on the guard ring width.
P
, ranging from 10k to 200k.
2
3
U
–
+
1
LT1055
LT1056
Offset Nulling
R
V
P
INFORMATION
–
U
5
4
7
6
LT1055/56 AI1
V
OUT
W
+
U
The LT1055/LT1056 has the lowest offset voltage of any
JFET input op amp available today. However, the offset
voltage and its drift with time and temperature are still not
as good as on the best bipolar amplifiers because the
transconductance of FETs is considerably lower than that
of bipolar transistors. Conversely, this lower transcon-
ductance is the main cause of the significantly faster
speed performance of FET input op amps.
Offset voltage also changes somewhat with temperature
cycling. The AM grades show a typical 20 V hysteresis
(30 V on the M grades) when cycled over the –55 C to
125 C temperature range. Temperature cycling from 0 C
to 70 C has a negligible (less than 10 V) hysteresis
effect.
The offset voltage and drift performance are also affected
by packaging. In the plastic N8 package the molding
compound is in direct contact with the chip, exerting
pressure on the surface. While NPN input transistors are
largely unaffected by this pressure, JFET device matching
and drift are degraded. Consequently, for best DC perfor-
mance, as shown in the typical performance distribution
plots, the TO-5 H package is recommended.
Noise Performance
The current noise of the LT1055/LT1056 is practically
immeasurable at 1.8fA/ Hz. At 25 C it is negligible up to
1G of source resistance, R
R
S
). Even at 125 C it is negligible to 100M of R
OFFSET
OUTPUT
TRIM
V
V
–
+
5
6
4
7
GUARD
N/C
8
S
(compound to the noise of
LT1055/LT1056
3
1
2
OFFSET
TRIM
LT1055/56 AI2
S
.
7