AD8021 datasheet(21/28 Pages) AD

21 / 28 page

ADA4896-2/ADA4897-1

Rev. 0 | Page 21 of 28

APPLICATIONS INFORMATION

TYPICAL PERFORMANCE VALUES

To reduce design time and eliminate uncertainty, Table 10

provides a convenient reference for typical gains, component

values, and performance parameters. The supply voltage used

is 5 V. The bandwidth is obtained with a small signal output

of 200 mV p-p, and the slew rate is obtained with a 2 V

output step. Note that as the gain increases, the small-signal

bandwidth decreases, as is expected from the gain bandwidth

product relationship. In addition, the phase margin improves

with higher gains, and the amplifier becomes more stable. As

a result, the peaking in the frequency response is reduced (see

Figure 49).

FREQUENCY (Hz)

100k

10M

100M

500M

–1

–2

–3

–4

–5

–6

VS = +5V

VOUT = 200mV p-p

RF = 249Ω

RL = 1kΩ

G = +20

G = +10

G = +5

G = +2

G = +1

Figure 49. Small Signal Frequency Response at Various Gains

Table 10. Recommended Values and Typical Performance

Gain

RF (Ω)

RG (Ω)

−3 dB BW

(MHz)

Slew Rate

(tR/tF) (V/μs)

Peaking

(dB)

Output Voltage Noise

Only (nV/√Hz)

Total Output Noise

Including Resistors (nV/√Hz)

N/A

78/158

0.8

1.0

249

101/140

1.2

3.6

249

61.9

119/137

6.8

+10

249

27.4

87/88

12.0

+20

249

13.0

37/37

21.1

AD8021 数据表(PDF) 21 Page - Analog Devices

AD8021 数据表(HTML) 21 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

数据表下载