SANYO LC7972VB, LC7972VA Datasheet

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.

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

• The following modes are supported. These are selected via port level settings.

Package Dimensions

unit: mm

3179A-SSOP20

CMOS LSI

Ordering number : EN5682

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

SANYO: SSOP20

[LC7972VA, VB]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

CMOS Operational Amplifier with Programmable

Offset Correction Function

LC7972VA, 7972VB

Port Level Function

OP1ON

L Operational amplifier 1: Operation stopped (low-power mode) H Operational amplifier 1: Normal operation (OP2ON must be low in this mode.)

OP2ON

L Operational amplifier 2: Operation stopped (low-power mode) H Operational amplifier 2: Normal operation (OP1ON must be low in this mode.)

OFST1

L Operational amplifier 1: Offset mode (inverting input = V

)

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

OFST2

L Operational amplifier 2: Offset mode (noninverting input = V

)

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

CLKC L Operational amplifier power supply clock: Internal clock

This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice.

■ 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.

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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:

➁ 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.

■ 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.

Pin Assignment

No. 5682-2/4

LC7972VA, 7972VB

Pin Functions

Function

No. Symbol

1 DV

Digital system power supply. Normally connected to +5 V. 2 EXT Must be tied low. 3 CLKC Must be tied low. 4 OP2ON Operational amplifier 2 operation control 5 OFST2 Operational amplifier 2 mode control 6 OP1ON Operational amplifier 1 operation control 7 OFST1 Operational amplifier 1 mode control 8 TGO Operational amplifier 1 VSS/small voltage output 9 OP1I Operational amplifier 1 input

10 OP1O Operational amplifier 1 output 11 OP2O Operational amplifier 2 output 12 OP2I Operational amplifier 2 input 13 TGI Small voltage input common to operational amplifiers 1 and 2 14 AV

M Operational amplifier power supply minus voltage generation

15 AV

Analog system power supply. Normally connected to +5 V.

16 AV

P Operational amplifier power supply external Zener diode connection

17 AV

Analog system ground. Must be connected to 0 V.

18 CUP2 Operational amplifier power supply external capacitor connection 2 19 CUP1 Operational amplifier power supply external capacitor connection 1 20 DV

Digital system ground. Must be connected to 0 V.

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