AD8058AR-REEL datasheet(11/16 Pages) AD

部件名	AD8058AR-REEL

功能描述	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers

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制造商	AD [Analog Devices]

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REV. B

AD8057/AD8058

–11–

FREQUENCY (Hz)

100

10

0.1

10

100M

100

1k

10k

100k

1

1M

10M

TPC 35. Current Noise vs. Frequency

FREQUENCY (MHz)

100

10

0.1

1000

1

10

100

1

TPC 36. Output Impedance vs. Frequency

APPLICATIONS

Driving Capacitive Loads

When driving a capacitive load, most op amps will exhibit over-

shoot in their pulse response.

Figure 3 shows the relationship between the capacitive load

that results in 30% overshoot and the closed-loop gain of an

AD8058. It can be seen that, under the Gain = +2 condition,

the device is stable with capacitive loads of up to 69 pF.

In general, to minimize peaking or to ensure device stability for

larger values of capacitive loads, a small series resistor, RS, can

be added between the op amp output and the load capacitor,

CL, as shown in Figure 4.

For the setup shown in Figure 4, the relationship between RS

and CL was empirically derived and is shown in Table I.

CLOSED-LOOP GAIN

500

400

0

15

2

34

300

200

100

RS = 2.4

RS = 0

Figure 3. Capacitive Load Drive vs. Closed-Loop Gain

Table I. Recommended Value for Resistors RS, RF, RG vs.

Capacitive Load, CL, Which Results in 30% Overshoot

Gain

RF

RG

CL w/RS = 0

Ω

CL w/RS = 2.4

Ω

(

Ω)(Ω)

(pF)

1

100

11

13

2

100

51

69

3

100

50

104

153

4

100

33.2

186

270

5

100

25

245

500

10

100

11

870

1580

–2.5V

RG

50k

VIN = 200mV p-p

AD8058

0.1 F

10 F

0.1 F

10 F

+2.5V

RF

CL

RS

VOUT

FET PROBE

Figure 4. Capacitive Load Drive Circuit

100mV

50ns/DIV

200mV

–100mV

–200mV

+ OVERSHOOT

29.0%

100mV/DIV

Figure 5. Typical Pulse Response with CL = 65 pF,

Gain = +2, and VS =

±2.5 V

类似零件编号 - AD8058AR-REEL

制造商	部件名	数据表	功能描述
Analog Devices	AD8058AR-REEL	184Kb / 14P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers REV. A
	AD8058AR-REEL7	184Kb / 14P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers REV. A
	AD8058AR-REEL7	485Kb / 17P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifier REV. D

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类似说明 - AD8058AR-REEL

制造商	部件名	数据表	功能描述
Analog Devices	AD8057	184Kb / 14P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers REV. A
	AD8058	352Kb / 16P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifier Rev. E
	AD8058ARZ	485Kb / 17P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifier REV. D
	AD8057	352Kb / 16P	Low Cost, High Performance Voltage Feedback, 325 MHz Amplifier Rev. E
	AD8055	491Kb / 17P	Low Cost, 300 MHz Voltage Feedback Amplifiers Rev. J
	AD8056	491Kb / 17P	Low Cost, 300 MHz Voltage Feedback Amplifiers Rev. J
	AD8055	207Kb / 11P	Low Cost, 300 MHz Voltage Feedback Amplifiers REV. B
	AD8055	302Kb / 16P	Low Cost, 300 MHz Voltage Feedback Amplifiers Rev. J
	AD8055ART	491Kb / 17P	Low Cost, 300 MHz Voltage Feedback Amplifiers Rev. J
	AD8039ARZ	533Kb / 17P	Low Power, 350 MHz Voltage Feedback Amplifiers Rev. G

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AD8058AR-REEL 数据表(PDF) 11 Page - Analog Devices

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