ADA4960-1ACPZ-R2 datasheet(15/19 Pages) AD

15 / 19 page

Data Sheet

ADA4960-1

Rev. A | Page 15 of 19

GAIN ADJUST

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

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 R

L 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. A

V vs. RG for RL = 100 Ω, RL = 200 Ω, RL = 500 Ω, and

L = 1 kΩ

V (dB)

L = 100 Ω

L = 200 Ω

L = 500 Ω

L = 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, C

S, in parallel with the gain-setting resistor, RG, as

shown in Figure 35.

IIP

VIP

25Ω

50Ω

25Ω

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 C

S 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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