BU7261G Datasheet, PDF(27/33 Page) Rohm – Low Voltage Operation CMOS Operational Amplifiers

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BU7261G Datasheet, PDF (27/33 Pages) Rohm – Low Voltage Operation CMOS Operational Amplifiers

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BU7261G,BU7261SG,BU7241G,BU7241SG,BU7262F/FVM,BU7262SF/FVM,BU7242F/FVM,BU7242SF/FVM

BU7461G,BU7461SG,BU7441G,BU7441SG,BU7462F/FVM,BU7462SF/FVM,BU7442F/FVM,BU7442SF/FVM

Technical Note

âDescription of electrical characteristics

Described here are the terms of electric characteristics used in this technical note. Items and symbols used are also shown.

Note that item name and symbol and their meaning may differ from those on another manufactureâs document or general document.

1. Absolute maximum ratings

Absolute maximum rating item indicates the condition which must not be exceeded. Application of voltage in excess of absolute

maximum rating or use out of absolute maximum rated temperature environment may cause deterioration of dharacteristics.

1.1 Power supply voltage (VDD/VSS)

Indicates the maximum voltage that can be applied between the positive power supply terminal and negative power supply

terminalwithout deterioration or destruction of characteristics of internal circuit.

1.2 Differential input voltage (Vid)

Indicates the maximum voltage that can be applied between non-inverting terminal and inverting terminal without

deterioration and destruction of characteristics of IC.

1.3 Input common-mode voltage range (Vicm)

Indicates the maximum voltage that can be applied to non-inverting terminal and inverting terminal without deterioration or

destruction of characteristics. Input common-mode voltage range of the maximum ratings not assure normal operation of IC.

When normalOperation of IC is desired, the input common-mode voltage of characteristics item must be followed.

1.4 Power dissipation (Pd)

Indicates the power that can be consumed by specified mounted board at the ambient temperature 25â(normal temperature).

As for package product, Pd is determined by the temperature that can be permitted by IC chip in the package(maximum

junction temperature) and thermal resistance of the package.

2. Electrical characteristics item

2.1 Input offset voltage (Vio)

Indicates the voltage difference between non-inverting terminal and inverting terminal. It can be translated into the input

voltage difference required for setting the output voltage at 0 [V].

2.2 Input offset current (Iio)

Indicates the difference of input bias current between non-inverting terminal and inverting terminal.

2.3 Input bias current (Ib)

Indicates the current that flows into or out of the input terminal. It is defined by the average of input bias current at

non-inverting terminal and input bias current at inverting terminal.

2.4 Circuit current (ICC)

Indicates the IC current that flows under specified conditions and no-load steady status.

2.5 High level output voltage / Low level output voltage(VOH/VOL)

Indicates the voltage range that can be output by the IC under specified load condition. It is typically divided into high-level

output voltage and low-level output voltage. High-level output voltage indicates the upper limit of output voltage. Low-level

output voltage indicates the lower limit.

2.6 Large signal voltage gain (AV)

Indicates the amplifying rate (gain) of output voltage against the voltage difference between non-inverting terminal and

inverting terminal.It is normally the amplifying rate (gain) with reference to DC voltage.

Av = (Output voltage fluctuation) / (Input offset fluctuation)

2.7 Input common-mode voltage range (Vicm)

Indicates the input voltage range where IC operates normally.

2.8 Common-mode rejection ratio (CMRR)

Indicates the ratio of fluctuation of input offset voltage when in-phase input voltage is changed. It is normally the fluctuation of DC.

CMRR ï¼(Change of Input common-mode voltage)/(Input offset fluctuation)

2.9 Power supply rejection ratio (PSRR)

Indicates the ratio of fluctuation of input offset voltage when supply voltage is changed. It is normally the fluctuation of DC.

PSRRï¼(Change of power supply voltage)/(Input offset fluctuation)

2.10 Channel separation(CS)

Indicates the fluctuation of input offset voltage or that of output voltage with reference to the change of output voltage of

driven channel.

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2009.05 - Rev.A

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