LC7972VB データシート ( CMOS Operational Amplifier with Programmable Offset Correction Function )

部品番号

LC7972VB

部品説明

CMOS Operational Amplifier with Programmable Offset Correction Function

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Sanyo Semicon Device

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LC7972VB Datasheet, LC7972VB PDF,ピン配置, 機能

Ordering number : EN5682

CMOS LSI

LC7972VA, 7972VB

CMOS Operational Amplifier with Programmable

Offset Correction Function

Overview

The LC7972VA and LC7972VB are dual

inverting/noninverting operational amplifier ICs that are

fabricated in a CMOS process. These ICs provide a

programmable offset correction function and a power

saving function for use when the operational amplifier is

unused, both of which can be controlled from a

microprocessor interface.

• The following modes are supported. These are selected

via port level settings.

Package Dimensions

unit: mm

3179A-SSOP20

[LC7972VA, VB]

Features

• High input impedance provided by fabrication in a

CMOS process.

• Low power provided by fabrication in a CMOS process.

• One of two types of operational amplifier can be

selected: inverting (operational amplifier 1) or

noninverting (operational amplifier 2)

• Operating supply voltage: 4.9 to 5.2 V

• Package: SSOP20

• Operating temperature: Ta = –30 to +70°C

SANYO: SSOP20

Port

OP1ON

OP2ON

OFST1

OFST2

CLKC

Level

Function

Operational amplifier 1: Operation stopped (low-power mode)

Operational amplifier 1: Normal operation (OP2ON must be low in this mode.)

Operational amplifier 2: Operation stopped (low-power mode)

Operational amplifier 2: Normal operation (OP1ON must be low in this mode.)

Operational amplifier 1: Offset mode (inverting input = VSS)

Operational amplifier 1: Operating mode (inverting input = normal input)

Operational amplifier 2: Offset mode (noninverting input = VSS)

Operational amplifier 2: Operating mode (noninverting input = normal input)

Operational amplifier power supply clock: Internal clock

s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace

equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of

which may directly or indirectly cause injury, death or property loss.

s Anyone purchasing any products described or contained herein for an above-mentioned use shall:

Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all

damages, cost and expenses associated with such use:

Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees

jointly or severally.

s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for

volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied

regarding its use or any infringements of intellectual property rights or other rights of third parties.

This catalog provides information as of July, 1997. Specifications and information herein are subject to change

without notice.

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

73097HA(OT) No. 5682-1/4

1 Page

LC7972VA, 7972VB

System Block Diagram and Sample Application

A circuit that amplifies very small voltages around the VSS level can be constructed by adding the peripheral circuits

shown in the figure below.

Step-down

voltage

converter circuit

Small-voltage input

A/D converter inputs

Microcontroller

Port outputs

No. 5682-3/4

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