AD7985 datasheet(20/28 Pages) AD

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ADA4896-2/ADA4897-1/ADA4897-2

Data Sheet

Rev.

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APPLICATIONS INFORMATION

TYPICAL PERFORMANCE VALUES

To reduce design time and eliminate uncertainty, Table 13

provides a reference for typical gains, component values, and

performance parameters. The supply voltage used is 5 V. The band-

width 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 51).

FREQUENCY (MHz)

0.1

100

500

–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 51. Small Signal Frequency Response at Various Gains

Table 13. Recommended Values and Typical Performance

Gain

RF (Ω)

RG (Ω)

−3 dB BW (MHz)

Slew Rate, tR/tF (V/μs)

Peaking (dB)

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

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