ADA4960-1ACPZ-R2 datasheet(16/21 Pages) AD

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ADA4960-1

Rev. 0 | Page 15 of 20

GAIN ADJUST

The gain of the ADA4960-1 is set with a single resistor, RG,

connected across the IIP and IIN pins. Because the output

impedance is 150 Ω, the load affects the gain. The voltage

gain can be calculated for both differential and single-ended

inputs as follows:

()

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

35.5

150

4.7

where RL and RG are the load and gain-setting resistors.

100

150

200

250

RG (Ω)

RL = 1kΩ

RL = 100Ω

RL = 500Ω

RL = 200Ω

Figure 34. AV vs. RG for RL = 100 Ω, RL = 200 Ω, RL = 500 Ω, and RL = 1 kΩ

Table 5. AV vs. RG for RL = 100 Ω, RL = 200 Ω, RL = 500 Ω, and

RL = 1 kΩ

AV (dB)

RL = 100 Ω

RL = 200 Ω

RL = 500 Ω

RL = 1 kΩ

246

370

505

576

106

167

237

271

35.2

65.7

101

118

15.2

32.8

41.7

BANDWIDTH EXTENSION

The bandwidth of the ADA4960-1 can be extended for both

differential and single-ended input configurations by connecting

a capacitor, CS, in parallel with the gain-setting resistor, RG, as

shown in Figure 35.

IIP

VIP

Ω

0.1µF

ETC1-1-13

ADA4960-1

0.1µF

VOP

VON

IIN

VIN

Figure 35. ADA4960-1 with Bandwidth Extension

Figure 36 shows the bandwidth extension for 6 dB and 12 dB gains.

Figure 37 shows the recommended CS values for most gains (dB).

100

10k

FREQUENCY (MHz)

CS = 2.2pF

CS = 0.1pF

Figure 36. Bandwidth Extension for 6 dB and 12 dB Gains

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

CS (pF)

Figure 37. Recommended CS Values for Most Gains

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