LC7972VA, 7972VB CMOS Operational Amplifier with Programmable Off

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LC7972VA, 7972VB CMOS Operational Amplifier with Programmable Off

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Ordering number EN5682
LC7972VA, 7972VB
CMOS Operational Amplifier with Programmable Offset Correction Function
Overview
LC7972VA LC7972VB dual inverting/noninverting operational amplifier that fabricated CMOS process. These provide programmable offset correction function power saving function when operational amplifier unused, both which controlled from microprocessor interface.
following modes supported. These selected port level settings.
Package Dimensions
unit: 3179A-SSOP20
[LC7972VA,
Features
High input impedance provided fabrication CMOS process. power provided fabrication CMOS process. types operational amplifier selected: inverting (operational amplifier noninverting (operational amplifier Operating supply voltage: Package: SSOP20 Operating temperature: +70°C
Port OP1ON Level OP2ON OFST1 OFST2 CLKC Function Operational amplifier Operation stopped (low-power mode) Operational amplifier Normal operation (OP2ON must this mode.) Operational amplifier Operation stopped (low-power mode) Operational amplifier Normal operation (OP1ON must this mode.) Operational amplifier Offset mode (inverting input VSS) Operational amplifier Operating mode (inverting input normal input) Operational amplifier Offset mode (noninverting input VSS) Operational amplifier Operating mode (noninverting input normal input) Operational amplifier power supply clock: Internal clock
SANYO: SSOP20
products described contained herein intended surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment like, failure which directly indirectly cause injury, death property loss. Anyone purchasing products described contained herein above-mentioned shall: Accept full responsibility indemnify defend SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees, jointly severally, against claims litigation damages, cost expenses associated with such use: impose responsibility fault negligence which cited such claim litigation SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees jointly severally. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties. This catalog provides information July, 1997. Specifications information herein subject change without notice.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
73097HA(OT) 5682-1/4
LC7972VA, 7972VB Assignment
Functions
Symbol DVDD CLKC OP2ON OFST2 OP1ON OFST1 OP1I OP1O OP2O OP2I AVSSM AVDD AVSSP AVSS CUP2 CUP1 DVSS Function Digital system power supply. Normally connected Must tied low. Must tied low. Operational amplifier operation control Operational amplifier mode control Operational amplifier operation control Operational amplifier mode control Operational amplifier VSS/small voltage output Operational amplifier input Operational amplifier output Operational amplifier output Operational amplifier input Small voltage input common operational amplifiers Operational amplifier power supply minus voltage generation Analog system power supply. Normally connected Operational amplifier power supply external Zener diode connection Analog system ground. Must connected Operational amplifier power supply external capacitor connection Operational amplifier power supply external capacitor connection Digital system ground. Must connected
5682-2/4
LC7972VA, 7972VB System Block Diagram Sample Application circuit that amplifies very small voltages around level constructed adding peripheral circuits shown figure below.
Step-down voltage converter circuit
Small-voltage input
converter inputs
Microcontroller
Port outputs
5682-3/4
LC7972VA, 7972VB
Specifications
Absolute Maximum Ratings 25°C,
Parameter Maximum supply voltage Output voltage Symbol Peak output current Average output current Allowable power dissipation Operating temperature Storage temperature Topr Tstg OP1O, OP2O, OP1ON, OFST1, OP2ON, OFST2, EXT, CLKC, CUP2, CUP1, AVSSP, OP1I, OP2I, AVSSM OP1O, OP2O, OP1O, OP2O, current SSOP20 +70°C Conditions Ratings -0.3 +7.0 -0.3 VDD+0.3 -0.3 VDD+0.3 +0.3 +125 Unit
Input voltage
Allowable Operating Ranges +70°C, unless otherwise specified
Parameter Supply voltage Input high-level voltage Input low-level voltage Common-mode input voltage Voltage drop Symbol VIL1 VIL2 AVSSM: Zener diode rank specified) OP1ON, OFST1, OP2ON, OFST2 OP1ON, OFST1, OP2ON, OFST2, CLKC Conditions Ratings -0.2 Unit
Electrical Characteristics +70°C, unless otherwise specified
Parameter Symbol IIH1 IIH2 IIL1 IIL2 Output high-level voltage Output low-level voltage Operational amplifier gain-related resistance Operational amplifier gain-related resistance difference Current drain Operating Standby IDDOP IDDST VDD; Using internal clock, with operational amplifier circuit operating. VDD; Both operational amplifiers stopped. 0.05 Conditions OP1ON, OFST1, OP2ON, OFST2 TGI: VDD, with built-in off. OP1ON, OFST1, OP2ON, OFST2, EXT, CLKC TGI: VSS, with built-in off. OP1O, OP2O OP1O, OP2O TGO, TGI: Offset mode: Operating mode: -1.0 -1.0 Ratings Unit
Input high-level current
Input low-level current
TGO, |Rx-Ry|
Operational Amplifier Characteristics 25°C ±2°C, unless otherwise specified
Parameter Symbol Conditions OP1I, OP2I LC7972VA Input offset voltage Supply voltage rejection ratio Common-mode rejection ratio Open-loop voltage gain 0-dB bandwidth Maximum output voltage Current drain Settling time PSRR CMRR TSET OP1O, OP2O operational amplifier circuit OP1O, OP2O LC7972VB Ratings 10.5 Unit
5682-4/4

LC7972VA, 7972VB CMOS Operational Amplifier with Programmable Off

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