op amp parameters

OP - AMP PARAMETERS

All important characteristics of an op amp are included in its data sheet. The data sheet contains the ff:

Description of the device Features Internal equivalent circuit Pin configuration Maximum rating Electrical characteristics Performance curves Circuit application

Description of the Device

The Analog Devices AD741 Series are high performance monolithic operational amplifiers

All the devices feature full short circuit protection and internal compensation

Internal Equivalent Circuit

PIN CONFIGURATION (TO-99) Common Packages and Typical Pin Outs

Pin 8 Tab Location

Pin 7 +V

Pin 6 Output

Pin 5 Offset Null

Pin 4 -V

Pin 3 Non-InvertingInput

Pin 2 Inverting Input

Pin 1 Offset Null

PIN CONFIGURATION (DIP Dual-In-

Package) Common Packages and Typical Pin Outs

Off

set

Nu

ll

N.C

.

N.C

.

Invert

ing

Non

In

vert

ing

-V

N

.C.

N.C

.

N.C

.

N.C

.

+V

Off

set

Nu

ll

N.C

.

Ou

tpu

t

PIN CONFIGURATION (Mini-DIP) Common Packages and Typical Pin Outs

Pin 8 NC

Pin 7 +V

Pin 6 Output

Pin 5 Offset Null

Pin 4 -V

Pin 1 Offset Null

Pin 2 Inverting InputPin 3 Non-InvertingInput

PIN CONFIGURATION (Flatpak) Common Packages and Typical Pin Outs

Pin 8 +V

Pin 7 Output

Pin 6 Offset Null

Pin 3 Inverting Input

Pin 2 Offset Null

Pin 1 N.C.

Pin 5 -V

Pin 9 N.C.

Pin 10 N.C.

Pin 4 Non-Inverting Input

OP AMP IDENTIFICATION CODE

AD 741C P (8-pin)

Letter prefix

Letter suffix

Designator

Letter prefixADCALMMC

NE/SEOP

RC/RM

SG

TLUA (A)

ManufacturerAnalog devicesRCANational Semiconductor Corp.MotorolaSignetics Precision Monolithics RaytheonSilicon GeneralTexas instrumentsFairchild

LETTER PREFIX identifies manufacturer

Temperature codes:C: Commercial, 0 to 70CI: Industrial, -25 to 85CM: Military, -55 to 125C

DESIGNATOR identifies the type of OP-AMP and its temperature range.

LETTER SUFFIX one or two letter suffix identifies the package style that houses the op amp chip.

Package CodeD

J

N,P

DescriptionPlastic DIP for surface mounting on a PC board

Ceramic DIP

Plastic DIP for insertion into socket

Absolute Maximum Parameters

Maximum means that the op-amp can safely tolerate the maximum ratings as given in the data sheet of such op-amp without the possibility of destroying it.

Supply Voltage (+/-Vs): The maximum voltage (positive and negative) that can be safely used to feed the op-amp. (+/- 18 volts)

Dissipation (Pd): The maximum power the op-amp is able to dissipate, by specified ambient temperature.(500mW @ 80° C).

Absolute Maximum Parameters

Differential Input Voltage (Vid): This is the maximum voltage that can be applied across the + and - inputs. (+/- 30 volts)

Input Voltage (Vicm): The maximum input voltage that can be simultaneously applied between both input and ground also referred to as the common-mode voltage. (+/- 15 volts)

Absolute Maximum Parameters

ELECTRICAL CHARACTERISTICS

Input parameters Output parameters Miscellaneous parameters

INPUT PARAMETERS

Input Offset Voltage (VIO) Input Bias Current (IB) Input Offset Current (IOS)Input Resistance/ Impedance (Rin or Zin)

Input Offset Voltage (Vio)The DC voltage that must be

applied between the input terminals to force the quiescent DC

output voltage to zero or other level, if specified.

Input parameters

Input Bias Current (IB)

The average of the current into the two terminals with the output at zero volts

Input parameters

Input Offset Current (IOS)

The difference between the currents into the two terminals with the output at zero volts.

Input parameters

Input Resistance/ Impedance (Rin / Zin)

The resistance between the input terminals with either input grounded.

Input parameters

OUTPUT PARAMETERS

Output Resistance/ Impedance (Rout or Zout)Output Short Circuit Current (IOSC)Output Voltage Swing (+/-VO max)Output Offset Voltage (Vos)

Output Resistance/ Impedance (Ro/Rout or

Zout)The resistance between the output

and the ground.

Output parameters

Output Short Circuit Current (Iosc)

The maximum output current available from the amplifier with the output shorted to the ground, to either supply, or to a specified

point.

Output parameters

Output Voltage Swing (Vomax)

The maximum peak output voltage that the op-amp can supply without

saturation.

Output parameters

Output Offset Voltage (Vos)

The unwanted voltage during when both input terminals have common

signals.

Output parameters

Adjustment to zero the DC output voltage of an OP AMP to counter the effects of input offset voltage

and/or current.

OFFSET NULLING

MISCELLANEOUSPARAMETERS

Open Loop Gain (AOL)

The ratio of the peak-to-peak output voltage swing to the change in input voltage required to drive

the output.

Miscellaneous parameters

Gain Bandwidth Product (GBP)

It equals the op-amp’s unity gain frequency, that indicates the upper

frequency that it can amplify.

A x BW = unity-gain frequency

Miscellaneous parameters

Slew Rate (SR)

The average time rate of change of the closed loop

amplifier output voltage for a step-signal input.

Miscellaneous parameters

Common Mode Rejection Ratio (CMRR)

Measure of the ability of the op-amp to reject signals that are

simultaneously present at both inputs. This is the ratio of differential

voltage amplification to a common mode voltage amplification.

Miscellaneous parameters

DEFINITION OF 741-PIN FUNCTIONS

PIN CONFIGURATION (Mini-DIP) Common Packages and Typical Pin Outs

Pin 8 NC

Pin 7 +V

Pin 6 Output

Pin 5 Offset Null

Pin 4 -V

Pin 1 Offset Null

Pin 2 Inverting InputPin 3 Non-InvertingInput

Definition of 741-pin Functions: • Pin 1 (Offset Null) : For offset nulling. An offset

null-adjustment potentiometer may be used to compensate for offset voltage.

Definition of 741-pin Functions: • Pin 2 (Inverting Input):  All input signals at this

pin will be inverted at output pin 6.

• Pin 3 (Non-Inverting Input):  All input signals at this pin will be processed normally without inversion.

Definition of 741-pin Functions: • Pin 4 (-V):  The -V pin is the negative supply

voltage terminal.

– -voltage operating range for the 741 is -4.5 volts (minimum) to -18 volts (maximum)

– recommended for stable operation is between -5 and -15 DC voltages

Definition of 741-pin Functions: • Pin 5 (Offset Null):   See pin 1

Pin 6 (Output):   Output voltage terminal

Definition of 741-pin Functions:

• Pin 7 (+V):  The +V pin is the positive supply voltage terminal.

– +voltage operating range for the 741 is +4.5 volts (minimum) to +18 volts (maximum)

– recommended for stable operation is between +5 and +15 DC voltages

Definition of 741-pin Functions:

• Pin 8 (N/C):  The 'N/C' stands for 'Not Connected'. There is no other explanation. There is nothing connected to this pin, it is just there to make it a standard 8-pin package.