LT1058ISW#TR Linear Technology, LT1058ISW#TR Datasheet - Page 9

• Manufacturer Part Number: LT1058ISW#TR
• Description: IC OPAMP JFET PREC QUAD 16SOIC
• Manufacturer: Linear Technology

Specifications of LT1058ISW#TR

• Amplifier Type: J-FET
• Number Of Circuits: 4
• Slew Rate: 13 V/µs
• Gain Bandwidth Product: 5MHz
• Current - Input Bias: 7pA
• Voltage - Input Offset: 250µV
• Current - Supply: 1.7mA
• Voltage - Supply, Single/dual (±): ±10 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -

Settling time is measured in a test circuit which can be
found in the LT1055/LT1056 data sheet and in Application
Note 10.
Achieving Picoampere/Microvolt Performance
In order to realize the picoampere/microvolt level accuracy
of the LT1057/LT1058, proper care must be exercised. For
example, leakage currents in circuitry external to the op
amp can signifi cantly degrade performance. High quality
insulation should be used (e.g., Tefl on
of all insulating surfaces to remove fl uxes and other resi-
dues 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 confi gurations, the guard
ring should be tied to ground, in noninverting connections,
to the inverting input. Guarding both sides of the printed
circuit board is required. Bulk leakage reduction depends
on the guard ring width.
The LT1057/LT1058 have the lowest offset voltage of any
dual and quad JFET input op amps available today. However,
the offset voltage and its drift with time and temperature are
still not as good as on the best bipolar amplifi ers (because
the transconductance of FETs is considerably lower than
that of bipolar transistors). Conversely, this lower trans-
conductance is the main cause of the signifi cantly faster
speed performance of FET input op amps.
APPLICATIONS INFORMATION
Teflon is a trademark of DuPont.
(A) ±16V Sine Wave Input
All Photos 5V/Div Vertical Scale, 50μs/Div Horizontal Scale
TM
, Kel-F); cleaning
(B) LF412A Output
Offset voltage also changes somewhat with temperature
cycling. The AM grades show a typical 40μV hysteresis
(50μV 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 20μV) hysteresis effect.
The offset voltage and drift performance are also affected
by packaging. In the plastic N package, the molding com-
pound is in direct contact with the chip, exerting pressure
on the surface. While NPN input transistors are largely
unaffected by this pressure, JFET device drift is degraded.
Consequently for best drift performance, as shown in the
Typical Performance Characteristics distribution plots, the
J or H packages are recommended.
In applications where speed and picoampere bias currents
are not necessary, Linear Technology offers the bipolar
input, pin compatible LT1013 and LT1014 dual and quad
op amps. These devices have signifi cantly better DC
specifi cations than any JFET input device.
Phase Reversal Protection
Most industry standard JFET input single, dual and quad
op amps (e.g., LF156, LF351, LF353, LF411, LF412,
OP-15, OP-16, OP-215, TL084) exhibit phase reversal at
the output when the negative common mode limit at the
input is exceeded (i.e., below –12V with ±15V supplies).
The photos below show a ±16V sine wave input (A), the
response of an LF412A in the unity gain follower mode
(B), and the response of the LT1057/LT1058 (C).
The phase reversal of photo (B) can cause lock-up in servo
systems. The LT1057/LT1058 does not phase-reverse due
to a unique phase reversal protection circuit.
(C) LT1057/LT1058 Output
LT1057/LT1058
10578fc
9