AD8631 datasheet(9/12 Pages) AD

Nome de Peças	AD8631

Descrição Electrónicos	1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers

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Fabricante Electrônico	AD [Analog Devices]

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AD8631/AD8632

–9–

REV. 0

The rail-to-rail feature of the AD8631 can be observed over the

supply voltage range, 1.8 V to 5 V. Traces are shown offset for

clarity.

INPUT BIAS CONSIDERATION

The input bias current (IB) is a non-ideal, real-life parameter that

affects all op amps. IB can generate a somewhat significant offset

voltage. This offset voltage is created by IB when flowing through

the negative feedback resistor RF. If IB is 250 nA (worst case), and

RF is 100 k

Ω, the corresponding generated offset voltage is 25 mV

(VOS = IB

RF).

Obviously the lower the RF the lower the generated voltage offset.

Using a compensation resistor, RB, as shown in Figure 21, can

minimize this effect. With the input bias current minimized we

still need to be aware of the input offset current (IOS) which will

generate a slight offset error. Figure 21 shows three different

configurations to minimize IB-induced offset errors.

NONINVERTING CONFIGURATION

AD8631

RS

VI

VOUT

RF = RS

UNITY GAIN BUFFER

VOUT

RF

RI

RB = RI RF

VI

VOUT

RB = RI RF

VI

RF

RI

AD8631

INVERTING CONFIGURATION

AD8631

Figure 21. Input Bias Cancellation Circuits

Q14

IN

VEE

VCC

VOUT

Q1

Q3

R5

R6

I2

R1

IN

R2

R4

R3

I1

R7

R8

D2

ESD

D7

D8

Q2

Q4

D1

ESD

D3

ESD

D4

ESD

Q5

Q6

Q7

C1

Q8

Q11

Q9

I4

I3

I5

Q13

I7

I6

C3

R10

R9

R11

Q15

Q17

D6

R12

Q18

I8

C2

R14

Q19

Q20

C4

D9

VCC

D16

R13

VEE

Q10

Figure 19. Simplified Schematic

Table I. Typical Battery Life Voltage Range

Nominal

End-of-Voltage

Battery

Voltage (V)

Discharge (V)

Lead-Acid

2

1.8

Lithium

2.6–3.6

1.7–2.4

NiMH

1.2

1

NiCd

1.2

1

Carbon-Zinc

1.5

1.1

RAIL-TO-RAIL INPUT AND OUTPUT

The AD8631 features an extraordinary rail-to-rail input and

output with supply voltages as low as 1.8 V. With the amplifier’s

supply set to 1.8 V, the input can be set to 1.8 V p-p, allowing the

output to swing to both rails without clipping. Figure 20 shows a

scope picture of both input and output taken at unity gain, with a

frequency of 1 kHz, at VS = 1.8 V and VIN = 1.8 V p-p.

TIME – 200 s/Div

VS = 1.8V

VIN = 1.8V p-p

VIN

VOUT

Figure 20. Rail-to-Rail Input Output

Nº de peça semelhante - AD8631

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Analog Devices	AD8631	157Kb / 12P	1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers REV. 0
Guangdong Youtai Semico...	AD8631	1Mb / 15P	480μA, 6.5MHz, RRIO CMOS Operational Amplifiers
Analog Devices	AD8631ART	157Kb / 12P	1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers REV. 0
Guangdong Youtai Semico...	AD8631ARTZ	1Mb / 15P	480μA, 6.5MHz, RRIO CMOS Operational Amplifiers

More results

Descrição semelhante - AD8631

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Analog Devices	AD8631	157Kb / 12P	1.8 V, 5 MHz Rail-to-Rail Low Power Operational Amplifiers REV. 0
STMicroelectronics	TS185X	427Kb / 24P	1.8 V input/output, rail-to-rail, low power operational amplifiers March 2010 Rev 4
STMicroelectronics	TS187X	1Mb / 25P	1.8 V input/output, rail-to-rail, low power operational amplifiers November 2012 Rev 7
Texas Instruments	TLV316-Q1	1Mb / 31P	[Old version datasheet] 10-MHz, Rail-to-Rail Input/Output, Low-Voltage, 1.8-V CMOS Operational Amplifiers
Texas Instruments	TLV316	1Mb / 37P	[Old version datasheet] 10-MHz, Rail-to-Rail Input/Output, Low-Voltage, 1.8-V CMOS Operational Amplifiers
STMicroelectronics	TSX7192	702Kb / 25P	Low-power, precision, rail-to-rail, 9.0 MHz, 16 V operational amplifiers March 2015 Rev 1
Analog Devices	AD8519	193Kb / 12P	8 MHz Rail-to-Rail Operational Amplifiers REV. C
	OP162	471Kb / 20P	15 MHz Rail-to-Rail Operational Amplifiers
	OP262	471Kb / 20P	15 MHz Rail-to-Rail Operational Amplifiers
	OP462	471Kb / 20P	15 MHz Rail-to-Rail Operational Amplifiers

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