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LC7972 PDF даташит

Спецификация LC7972 изготовлена ​​​​«Sanyo Semicon Device» и имеет функцию, называемую «CMOS Operational Amplifier with Programmable Offset Correction Function».

Детали детали

Номер произв LC7972
Описание CMOS Operational Amplifier with Programmable Offset Correction Function
Производители Sanyo Semicon Device
логотип Sanyo Semicon Device логотип 

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LC7972 Даташит, Описание, Даташиты
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
L
H
L
H
L
H
L
H
L
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:
ΠAccept 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









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LC7972 Даташит, Описание, Даташиты
Pin Assignment
LC7972VA, 7972VB
Pin Functions
Pin
No. Symbol
Function
1 DVDD 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 AVSSM Operational amplifier power supply minus voltage generation
15 AVDD Analog system power supply. Normally connected to +5 V.
16 AVSSP Operational amplifier power supply external Zener diode connection
17 AVSS 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 DVSS Digital system ground. Must be connected to 0 V.
No. 5682-2/4









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LC7972 Даташит, Описание, Даташиты
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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