Intersil Corporation CA5420A Datasheet

CA5420A

Data Sheet September 1998 File Number 1925.4

0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Amplifiers

The CA5420A is an integrated circuit operational amplifier
that combines PMOS transistors and bipolar transistors on a
single monolithic chip. It is designed and guaranteed to
operate in microprocessor logic systems that use V+ = 5V,
V- = GND, since it can operate down to ±1V supplies. It will
also be suitable for 3.3V logic systems.

The CA5420A BiMOS operational amplifier features gate­protected PMOS transistors in the input circuit to provide
very high inputimpedance,very lowinputcurrents(lessthan
1pA). The internal bootstrapping network features a unique
guardbanding techniquefor reducing the doublingofleakage
current for every 10
CA5420A operates at total supply voltages from 2V to 20V
either single or dual supply. This operational amplifier is
internally phase compensated to achievestableoperationin
the unity gain follower configuration. Additionally, it has
access terminals for a supplementary external capacitor if
additional frequency roll-off is desired. Terminals are also
provided for use in applications requiring input offset voltage
nulling. The use of PMOS in the input stage results in
common-mode input voltage capability down to 0.45V below
the negativesupplyterminal,animportant attribute forsingle
supply application. The output stage uses a feedback OTA
type amplifier that can swing essentially from rail-to-rail. The
output driving current of 1.0mA (Min) is provided by using
nonlinear current mirrors.

This device has guaranteed specifications for 5Voperation
over the full military temperature range of -55

o

C increase in temperature. The

o

C to 125oC.

Features

• CA5420A at 5V Supply Voltage with Full Military
Temperature Range Guaranteed Specifications

• CA5420A Guaranteed to Operate from ±1V to ±10V
Supplies

• 2V Supply at 300µA Supply Current

• 1pA (Typ) Input Current (Essentially Constant to 85

o

• Rail-to-Rail Output Swing (Drive ±2mA Into 1kΩ Load)

• Pin Compatible with 741 Op Amp

Applications

• pH Probe Amplifiers

• Picoammeters

• Electrometer (High Z) Instruments

• Portable Equipment

• Inaccessible Field Equipment

• Battery Dependent Equipment (Medical and Military)

• 5V Logic Systems

• Microprocessor Interface

Ordering Information

PART NUMBER

(BRAND)

CA5420AM
(5420A)

TEMP.

RANGE (oC) PACKAGE

-55 to 125 8 Ld SOIC M8.15

PKG.

NO.

C)

The CA5420A has the same 8 lead pinout used for the
industry standard 741.

Functional Diagram

X1

-

MOS

X1

BUFFER AMPS;

BOOTSTRAPPED

INPUT PROTECTION

NETWORK

BIPOLAR

+

HIGH GAIN

(50K)

1

MOS

BIPOLAR

OTA BUFFER

(X2)

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Pinout

CA5420A

(SOIC)

TOP VIEW

OFFSET

NON-INV.

NOTE: Pin is connected to Case.

1-888-INTERSIL or 321-724-7143

NULL

INV.

INPUT

INPUT

1

2

3

4

V-

8

STROBE

7

-

+

| Copyright © Intersil Corporation 1999

V+

6

OUTPUT
OFFSET

5

NULL

CA5420A

Absolute Maximum Ratings Thermal Information

Supply Voltage (Between V+ and V- Terminals) . . . . . . . . . . . . 22V

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . (V+ + 8V) to (V- -0.5V)

Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA

Output Short Circuit Duration (Note 1). . . . . . . . . . . . . . . . Indefinite

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1. Short circuit may be applied to ground or to either supply.

2. θJA is measured with the component mounted on an evaluation PC board in free air.

Thermal Resistance (Typical, Note 2) θJA (oC/W) θJC (oC/W)

SOIC Package . . . . . . . . . . . . . . . . . . . 157 N/A

Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC

Maximum Storage Temperature Range (All T ypes). . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

(SOIC - Lead Tips Only)

Electrical Specifications Typical Values Intended Only for Design Guidance. V+ = +5V; V- = GND, T

= 25oC

A

PARAMETER SYMBOL TEST CONDITIONS CA5420A UNITS

Input Resistance R
Input Capacitance C
Output Resistance R
Equivalent Input

Noise Voltage

Short-Circuit Current To
Opposite Supply

Source IOM+ 2.6 mA
Sink IOM- 2.4 mA

Gain Bandwidth Product f

I
I

O

e

N

f = 1kHz RS = 100Ω 62 nV/√Hz
f = 10kHz 38 nV/√Hz

T

150 TΩ

4.9 pF

300 Ω

0.5 MHz
Slew Rate SR 0.5 V/µs
Transient Response Rise Time t

r

RL = 2kΩ, CL = 100pF 0.7 µs

Overshoot OS 15 %
Current from Terminal 8 To V- I8+20µA
Current from Terminal 8 To V+ I8-2mA
Settling Time 0.01% AV = 1 2V

0.10% AV = 1 2V

Electrical Specifications T

= 25oC, V+ = 5V, V- = 0, Unless Otherwise Specified

A

TEST

PARAMETER SYMBOL

Input Offset Voltage V
Input Offset Current I
Input Current I

IO
IO

I

VO = 2.5V - 1 5 mV
VO = 2.5V - 0.02 0.5 pA
VO = 2.5V - 0.02 1 pA

CONDITIONS

Input 8 µs

P-P

Input 4.5 µs

P-P

CA5420A

UNITSMIN TYP MAX

Common Mode Rejection Ratio CMRR VCM = 0 to 3.7V, VO = 2.5V 75 83 - dB
Common Mode Input Voltage Range V

+VO = 2.5V 3.7 4 - V

lCR

V

- - -0.3 0 V

lCR

Power Supply Rejection Ratio PSRR ∆V+ = 1V; ∆V- = 1V 75 83 - dB
Large Signal Voltage Gain A

OL

VO = 0.5 to 4V RL = ∞ 85 87 - dB
VO = 0.5 to 4V RL = 10kΩ 85 87 - dB
VO = 0.7 to 3V RL = 2kΩ 80 85 - dB

2

CA5420A

Electrical Specifications T

PARAMETER SYMBOL

Source Current I
Sink Current I

= 25oC, V+ = 5V, V- = 0, Unless Otherwise Specified (Continued)

A

TEST

CONDITIONS

SOURCE

SINK

VO = 0V 1.2 2.7 - mA
VO = 5V 1.2 2.1 - mA

CA5420A

UNITSMIN TYP MAX

Output Voltage VOM+RL = ∞ 4.9 4.94 - V

VOM- - 0.13 0.15 V

VOM+RL = 10kΩ 4.7 4.9 - V

VOM- - 0.12 0.15 V

VOM+RL = 2kΩ 3.5 4.6 - V

VOM- - 0.1 0.15 V

Supply Current I

SUPPLY

VO = 0V - 400 500 µA
VO = 2.5V - 430 550 µA

Electrical Specifications T

PARAMETER SYMBOL

Input Offset Voltage V
Input Offset Current I

= -55oC to 125oC, V+ = 5V, V- = 0, Unless Otherwise Specified

A

TEST

CONDITIONS

IO

IO

VO = 2.5V - 2 10 mV
VO = 2.5V - 1.5 3 nA

CA5420A

UNITSMIN TYP MAX

Up to TA = 85oC - 2 10 pA

Input Current |II| VO = 2.5V - 2 5 nA

Up to TA = 85oC -1015pA

Common Mode Rejection Ratio CMRR VCM = 0 to 3.7V,

70 80 - dB

VO = 2.5V

Common Mode Input Voltage Range V

Power Supply Rejection Ratio PSRR ∆V+ = 1V;

+VO = 2.5V 3.7 4 - V

lCR

V

- - -0.3 0 V

lCR

70 83 - dB

∆V- = 1V

Large Signal Voltage Gain A

OL

VO = 0.5 to 4V RL = ∞ 85 87 - dB
VO = 0.7 to 4V RL = 10kΩ 80 87 - dB

VO = 0.7 to 2.5V RL = 2kΩ 75 80 - dB
Source Current I
Sink Current I

SOURCE

SINK

VO = 0V 1 2.7 - mA
VO = 5V 1 2.1 - mA

Output Voltage VOM+RL = ∞ 4.8 4.9 - V

VOM- - 0.16 0.2 V

VOM+RL = 10kΩ 4.7 4.9 - V

VOM- - 0.15 0.2 V

VOM+RL = 2kΩ 34- V

VOM- - 0.14 0.2 V

Supply Current I

SUPPLY

VO = 0V - 430 550 µA
VO = 2.5V - 480 600 µA

3