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| 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 +70C Port OP1ON Level L H L OP2ON H L OFST1 H L OFST2 CLKC 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 SANYO: SSOP20 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 LC7972VA, 7972VB Pin Assignment Pin Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol DVDD EXT CLKC OP2ON OFST2 OP1ON OFST1 TGO OP1I OP1O OP2O OP2I TGI AVSSM AVDD AVSSP AVSS CUP2 CUP1 DVSS Function Digital system power supply. Normally connected to +5 V. Must be tied low. Must be tied low. Operational amplifier 2 operation control Operational amplifier 2 mode control Operational amplifier 1 operation control Operational amplifier 1 mode control Operational amplifier 1 VSS/small voltage output Operational amplifier 1 input Operational amplifier 1 output Operational amplifier 2 output Operational amplifier 2 input Small voltage input common to operational amplifiers 1 and 2 Operational amplifier power supply minus voltage generation Analog system power supply. Normally connected to +5 V. Operational amplifier power supply external Zener diode connection Analog system ground. Must be connected to 0 V. Operational amplifier power supply external capacitor connection 2 Operational amplifier power supply external capacitor connection 1 Digital system ground. Must be connected to 0 V. No. 5682-2/4 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 LC7972VA, 7972VB Specifications Absolute Maximum Ratings at Ta = 25C, VSS = 0 V Parameter Maximum supply voltage Output voltage Symbol VDD max VO VI1 VI2 Peak output current Average output current Allowable power dissipation Operating temperature Storage temperature IOP IOA Pd max Topr Tstg VDD OP1O, OP2O, TGO OP1ON, OFST1, OP2ON, OFST2, EXT, CLKC, CUP2, CUP1, AVSSP, OP1I, OP2I, TGI AVSSM OP1O, OP2O, TGO OP1O, OP2O, TGO : The current per pin SSOP20 : Ta = -30 to +70C Conditions Ratings -0.3 to +7.0 -0.3 to VDD+0.3 -0.3 to VDD+0.3 -3 to +0.3 -1 to +1 -1 to +1 100 -30 to +70 -55 to +125 Unit V V V V mA mA mW C C Input voltage Allowable Operating Ranges at Ta = -30 to +70C, VSS = 0 V, VDD = 4.9 to 5.2 V, unless otherwise specified Parameter Supply voltage Input high-level voltage Input low-level voltage Common-mode input voltage Voltage drop Symbol VDD VIH VIL1 VIL2 VIC DV AVSSM: Zener diode = 5.1 V (X rank specified) VDD OP1ON, OFST1, OP2ON, OFST2 OP1ON, OFST1, OP2ON, OFST2, CLKC EXT Conditions Ratings min 4.9 0.7 VDD VSS VSS 0 -0.2 typ max 5.2 VDD 0.3 VDD 0.3 VDD 4.2 Unit V V V V V V Electrical Characteristics at Ta = -30 to +70C, VSS = 0 V, VDD = 4.9 to 5.2 V, unless otherwise specified Parameter Symbol IIH1 IIH2 IIL1 IIL2 Output high-level voltage Output low-level voltage Operational amplifier 1 gain-related resistance Operational amplifier 1 gain-related resistance difference Current drain Operating Standby IDDOP IDDST VDD; Using the internal clock, with the operational amplifier 1 circuit operating. VDD; Both operational amplifiers 1 and 2 stopped. 700 0.05 900 10 A A VOH VOL Conditions OP1ON, OFST1, OP2ON, OFST2 : VIN = VDD TGI: VIN = VDD, with the built-in TG off. OP1ON, OFST1, OP2ON, OFST2, EXT, CLKC : VIN = VSS TGI: VIN = VSS, with the built-in TG off. OP1O, OP2O : IOH = -3 A OP1O, OP2O : IOL = 3 A 500 700 TGO, TGI: Offset mode: Rx = Rtg + 2Rs Operating mode: Ry = Rtg + 2Rs -1.0 -1.0 VDD - 0.5 0.5 900 80 Ratings min typ max 1.0 1.0 Unit A A A A V V Input high-level current Input low-level current Rtg + 2Rs TGO, TGI |Rx-Ry| Operational Amplifier Characteristics at Ta = 25C 2C, VSS = 0 V, VDD = 4.9 to 5.2 V, 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 VIO PSRR CMRR AO fT VO ICC TSET OP1O, OP2O : RL 100 k For the operational amplifier 1 circuit OP1O, OP2O 1 kHz LC7972VB Ratings min typ 5 5 60 60 80 90 VDD - 0.5 100 900 max 10.5 15 Unit mV mV dB dB dB kHz V A s No. 5682-4/4 |
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