ca3420a Intersil Corporation, ca3420a Datasheet

ca3420a

Manufacturer Part Number

ca3420a

Description

0.5mhz, Low Supply Voltage, Low Input Current Bimos Operational Amplifiers

Manufacturer

Intersil Corporation

Datasheet

1.CA3420A.pdf (6 pages)

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0.5MHz, Low Supply Voltage, Low Input

Current BiMOS Operational Ampliﬁers

The CA3420A and CA3420 are integrated circuit operational

ampliﬁers that combine PMOS transistors and bipolar

transistors on a single monolithic chip. The CA3420A and

CA3420 BiMOS operational ampliﬁers feature gate

protected PMOS transistors in the input circuit to provide

very high input impedance, very low input currents (less than

1pA). The internal bootstrapping network features a unique

guardbanding technique for reducing the doubling of leakage

current for every 10

series operates at total supply voltages from 2V to 20V

either single or dual supply. These operational ampliﬁers are

internally phase compensated to achieve stable operation in

the unity gain follower conﬁguration. Additionally, they have

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 negative supply terminal, an important attribute for single

supply application. The output stage uses a feedback OTA

type ampliﬁer that can swing essentially from rail-to-rail. The

output driving current of 1.5mA (Min) is provided by using

nonlinear current mirrors.

Ordering Information

Pinouts

CA3420AT

CA3420E

PART NUMBER

OFFSET NULL

NON-INV.

INPUT

INV.

V-

RANGE (

C increase in temperature. The CA3420

-55 to 125

TEMP.

CA3420 (PDIP)

TOP VIEW

8 Pin Metal Can

8 Ld PDIP

1-888-INTERSIL or 321-724-7143

Data Sheet

PACKAGE

STROBE

V+

OUTPUT

OFFSET NULL

T8.C

E8.3

PKG.

NO.

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

Intersil and Design is a trademark of Intersil Corporation.

Features

• 2V Supply at 300 A Supply Current

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

• Rail-to-Rail Output Swing (Drive 2mA into 1k Load)

• Pin Compatible with 741 Operational Ampliﬁers

Applications

• pH Probe Ampliﬁers

• Picoammeters

• Electrometer (High Z) Instruments

• Portable Equipment

• Inaccessible Field Equipment

• Battery-Dependent Equipment (Medical and Military)

Functional Diagram

INPUT PROTECTION

BOOTSTRAPPED

BUFFER AMPS;

NETWORK

OFFSET NULL

April 2000

NON-INV.

INPUT

INV.

INPUT

CA3420 (METAL CAN)

BIPOLAR

HIGH GAIN

CA3420, CA3420A

MOS

TOP VIEW

(50K)

TAB

V-

File Number

STROBE

V+

OFFSET NULL

OUTPUT

BIPOLAR

OTA BUFFER

Intersil Corporation 2000

MOS

(X2)

1320.6

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ca3420a Summary of contents

Page 1

... Current BiMOS Operational Ampliﬁers The CA3420A and CA3420 are integrated circuit operational ampliﬁers that combine PMOS transistors and bipolar transistors on a single monolithic chip. The CA3420A and CA3420 BiMOS operational ampliﬁers feature gate protected PMOS transistors in the input circuit to provide very high input impedance, very low input currents (less than 1pA) ...

Page 2

... Input Offset Voltage Temperature Drift NOTE: 3. The maximum limit represents the levels obtainable on high speed automatic test equipment. Typical values are obtained under laboratory conditions. 2 CA3420, CA3420A Thermal Information Thermal Resistance (Typical, Note 2) PDIP Package . . . . . . . . . . . . . . . . . . . ...

Page 3

... Supply current in the standby position with the meter undeﬂected is 300 A. At full-scale deﬂection this current rises to 800 A. Carbon-zinc battery life should be in excess of 1,000 hours. 3 CA3420, CA3420A = 10V SUPPLY A CA3420 TEST ...

Page 4

... -20V V- = -10V 100 -2V 10 0.01 0.1 LOAD (SINKING) CURRENT (mA) FIGURE 5. OUTPUT VOLTAGE vs LOAD SINKING CURRENT FIGURE 7. OPEN LOOP GAIN AND PHASE SHIFT RESPONSE 4 CA3420, CA3420A 100 ICR V + ICR 1000 10 15 FIGURE 4. OUTPUT VOLTAGE vs LOAD SOURCING CURRENT ...

Page 5

... B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N for E8.3, E16.3, E18.3, E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm). 5 CA3420, CA3420A E8.3 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE SYMBOL ...

Page 6

... For information regarding Intersil Corporation and its products, see web site www.intersil.com Sales Ofﬁce Headquarters NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (321) 724-7000 FAX: (321) 724-7240 6 CA3420, CA3420A T8.C MIL-STD-1835 MACY1-X8 (A1) 8 LEAD METAL CAN PACKAGE e 1 SYMBOL ØD2 A Ø ...

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