AD8616_15 datasheet(11/20 Pages) AD

Numer części	AD8616

Szczegółowy opis	Precision, 20 MHz, CMOS, Rail-to-Rail

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Producent	AD [Analog Devices]

Strona internetowa	http://www.analog.com

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11 / 20 page

Data Sheet

AD8615/AD8616/AD8618

Rev. G | Page 11 of 20

APPLICATIONS INFORMATION

INPUT OVERVOLTAGE PROTECTION

If the voltage applied at either input exceeds the supplies, place

external resistors in series with the inputs. The resistor values

can be determined by the equation

mA

5

V

SY





S

IN

R

V

The extremely low input bias current allows the use of larger

resistors, which allows the user to apply higher voltages at the

inputs. The use of these resistors adds thermal noise, which

contributes to the overall output voltage noise of the amplifier.

For example, a 10 kΩ resistor has less than 13 nV/√Hz of

thermal noise and less than 10 nV of error voltage at room

temperature.

OUTPUT PHASE REVERSAL

The AD8615/AD8616/AD8618 are immune to phase inversion,

a phenomenon that occurs when the voltage applied at the input of

the amplifier exceeds the maximum input common mode.

Phase reversal can cause permanent damage to the amplifier

and can create lock ups in systems with feedback loops.

TIME (2ms/DIV)

VIN

VOUT

VS = ±2.5V

VIN = 6V p-p

AV = 1

RL = 10kΩ

Figure 36. No Phase Reversal

DRIVING CAPACITIVE LOADS

Although the AD8615/AD8616/AD8618 are capable of driving

capacitive loads of up to 500 pF without oscillating, a large amount

of overshoot is present when operating at frequencies above

100 kHz. This is especially true when the amplifier is configured

in positive unity gain (worst case). When such large capacitive

loads are required, the use of external compensation is highly

recommended.

This reduces the overshoot and minimizes ringing, which in

turn improves the frequency response of the AD8615/AD8616/

AD8618. One simple technique for compensation is the snubber,

which consists of a simple RC network. With this circuit in place,

output swing is maintained and the amplifier is stable at all gains.

Figure 38 shows the implementation of the snubber, which

reduces overshoot by more than 30% and eliminates ringing

that can cause instability. Using the snubber does not recover

the loss of bandwidth incurred from a heavy capacitive load.

TIME (2µs/DIV)

VS = ±2.5V

AV = 1

CL = 500pF

Figure 37. Driving Heavy Capacitive Loads Without Compensation

V+

200Ω

500pF

V–

VEE

VCC

200mV

–

+

–

Figure 38. Snubber Network

TIME (10µs/DIV)

VS =±2.5V

AV = 1

RS = 200Ω

CS = 500pF

CL = 500pF

Figure 39. Driving Heavy Capacitive Loads Using the Snubber Network

Podobny numer części - AD8616_15

Producent	Numer części	Arkusz danych	Szczegółowy opis
Analog Devices	AD8616AR	495Kb / 16P	Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers REV. A
	AD8616AR	190Kb / 5P	Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers REV. PrA
	AD8616AR	403Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. C
	AD8616AR	442Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. E
	AD8616AR-REEL	403Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. C

More results

Podobny opis - AD8616_15

Producent	Numer części	Arkusz danych	Szczegółowy opis
Analog Devices	AD8615	449Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Rev. G
	AD8618	449Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Rev. G
	AD8616	495Kb / 16P	Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers REV. A
	AD8616ARMZ	442Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. E
	AD8615	442Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. E
	AD8615	403Kb / 20P	Precision, 20 MHz, CMOS, Rail-to-Rail Input/Output Operational Amplifiers Rev. C
	AD8615	190Kb / 5P	Precision 20 MHz CMOS Rail-to-Rail Input/Output Operational Amplifiers REV. PrA
	AD8601	350Kb / 24P	Precision CMOS, Single-Supply, Rail-to-Rail Rev. G
	AD8606	836Kb / 24P	Precision, Low Noise, CMOS, Rail-to-Rail Rev. N
	AD8602	350Kb / 24P	Precision CMOS, Single-Supply, Rail-to-Rail Rev. G

More results

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