LM363

The LM363 was designed to be as simple to use as possi-ble but several general precautions must be taken The dif-ferential inputs are directly coupled and need a return path to power supply common Worst-case bias currents are only 10 nA for the LM363 so the return impedance can be as high as 100 M Ground drops between signal return and IC supply common should not be ignored While the LM363 has excellent common-mode rejection signals must remain within the proper common-mode range for this specification to apply Operating common-mode range is guaranteed from -10V to +10V with ±15V supplies

The high-gain (500 or 1000) versions have large gain-band-width products (15 MHz or 30 MHz) so board layout is fairly critical The differential input leads should be kept away from output force and sense leads especially at high imped-ances Only 1 pF from output to positive input at 100 kX source impedance can cause oscillations The gain adjust leads on the 16-pin package should be treated as inputs and kept away from the output wiring

SupplyVoltage                                                 ±18V
DifferentialInputVoltage                                  ±10V
InputCurrent                                                ±20mA

InputVoltage                         EqualtoSupplyVoltage
ReferenceandSenseVoltage                          ± 25V
LeadTemp(Soldering10sec)                          ±300C
ESD rating to be determined

The LM363 is a monolithic true instrumentation amplifier It requires no external parts for fixed gains of 10 100 and 1000 High precision is attained by on-chip trimming of off-set voltage and gain A super-beta bipolar input stage gives very low input bias current and voltage noise extremely low offset voltage drift and high common-mode rejection ratio A two-stage amplifier design yields an open loop gain of 10000000 and a gain bandwidth product of 30 MHz yet remains stable for all closed loop gains The LM363 oper-ates with supply voltages from ±5V to ±18V with only 15 mA current drain

The LM363's low voltage noise low offset voltage and off-set voltage drift make it ideal for amplifying low-level low-impedance transducers At the same time its low bias cur-rent and high input impedance (both common-mode and differential) provide excellent performance at high imped-ance levels These features along with its ultra-high com-mon-mode rejection allow the LM363 to be used in the most demanding instrumentation amplifier applications re-placing expensive hybrid module or multi-chip designs Be-cause the LM363 is internally trimmed precision external resistors and their associated errors are eliminated

The 16-pin dual-in-line package provides pin-strappable gains of 10 100 or 1000 Its twin differential shield drivers eliminate bandwidth loss due to cable capacitance Com-pensation pins allow overcompensation to reduce band-width and output noise or to provide greater stability with capacitive loads Separate output force sense and refer-ence pins permit gains between 10 and 10000 to be pro-grammed using external resistors

On the 8-pin metal can package gain is internally set at 10100 or 500 but may be increased with external resistors

The shield driver and offset adjust pins are omitted on the 8-pin versions

The LM363 is rated for 0Cto70C