OP297

Features:

Precision Performance in Standard SO-8 Pinout
Low Offset Voltage: 50 V max
Low Offset Voltage Drift: 0.6 mV/8C max
Very Low Bias Current:
+258C (100 pA max)
558C to +1258C (450 pA max)
Very High Open-Loop Gain (2000 V/mV min)
Low Supply Current (Per Amplifier): 625 A max
Operates From 62 V to 620 V Supplies
High Common-Mode Rejection: 120 dB min
Pin Compatible to LT1013, AD706, AD708, OP221,
LM158, and MC1458/1558 with Improved Performance




Pinout








Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±20 V
Input Voltage² . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±20 V
Differential Input Voltage² . . . . . . . . . . . . . . . . . . . . . .40 V
Output Short-Circuit Duration . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
Z Package . . . . . . . . . . . . . . . . . . . . . . . .65°C to +175°C
P, S Package . . . . . . . . . . . . . . . . . . . . . .65°C to +150°C
Operating Temperature Range
OP297A (Z) . . . . . . . . . . . . . . . . . . . . . . .55°C to +125°C
OP297E, F (Z) . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
OP297F, G (P, S) . . . . . . . . . . . . . . . . . . .40°C to +85°C
Junction Temperature
Z Package . . . . . . . . . . . . . . . . . . . . . . . .65°C to +175°C
P, S Package . . . . . . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . +300°C






Description

The OP297 is the first dual op amp to pack precision performance into the space-saving, industry standard 8-pin SO package. Its combination of precision with low power and extremely low input bias current makes the dual OP297 useful in a wide variety of applications.

Precision performance of the OP297 includes very low offset, under 50 V, and low drift, below 0.6 V/°C. Open-loop gain exceeds 2000 V/mV insuring high linearity in every application.

Errors due to common-mode signals are elimin-ated by the OP297's common-mode rejection of over 120 dB. The OP297's power supply rejection of over 120 dB mi-nimizes offset voltage changes experienced in battery powered systems. Supply current of the OP297 is under 625 A per amplifier and it can operate with supply voltages as low as ±2 V.

The OP297 utilizes a super-beta input stage with bias current cancellation to maintain picoamp bias currents at all temperatures. This is in contrast to FET input op amps whose bias currents start in the picoamp range at 25°C, but double for every 10°C rise in temperature, to reach the nanoamp range above 85°C. Input bias current of the OP 297 is under 100 pA at 25°C and is under 450 pA over the military temperature range.

Combining precision, low power and low bias current, the OP297 is ideal for a number of applications including instr-umentation amplifiers, log amplifiers, photodiode preamplifiers and long-term integrators. For a single device, see the OP97; for a quad, see the OP497.