AD8352ACPZ-R2 datasheet(12/20 Pages) AD

12 / 20 page

AD8352

Rev. B | Page 12 of 20

800

RG (Ω)

100

200

300

400

500

600

700

Figure 24. Gain vs. RG, RL = 1 kΩ

CD (pF)

0.1

0.2

0.3

0.4

Figure 25. Gain vs. CD, RL = 1 kΩ

SINGLE-ENDED INPUT OPERATION

The AD8352 can be configured as a single-ended-to-differential

amplifier, as shown in Figure 26. To balance the outputs when

driving the VIP input, an external resistor (RN) of 200 Ω is added

between VIP and RGN. See Equation 2 to determine the single-

ended input gain (AV Single-Ended) for a given RG or RL.

430

)

(

)

(

500

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

−

Ended

Single

(2)

where

is the single-ended load.

is the gain setting resistor.

Figure 27 plots gain vs. RG for 200 Ω and 1 kΩ loads. Table 7

and Table 8 show the values of CD and RD required (for 180 MHz

broadband, third-order, single tone optimization) for 200 Ω and

1 kΩ loads, respectively. This single-ended configuration provides

−3 dB bandwidths similar to input differential drive. Figure 28

through Figure 31 show distortion levels at a gain of 12 dB for

both 200 Ω and 1 kΩ loads. Gains from 3 dB to 18 dB, using

optimized CD and RD values, obtain similar distortion levels.

25Ω

65Ω

50Ω

0.1µF

RGP

RGN

AD8352

VIP

200Ω

Figure 26. Single-Ended Schematic

10k

RG (Ω)

100

GAIN, RL =1kΩ

GAIN, RL =200Ω

Figure 27. Gain vs. RG

–60

–110

FREQUENCY (MHz)

140

190

240

–70

–80

–90

–100

2V p-p OUT

1V p-p OUT

Figure 28. Single-Ended, Second-Order Harmonic Distortion (HD2) vs.

Frequency, 200 Ω Load

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