AD8352ACPZ-R7 datasheet(12/20 Pages) AD

12 / 20 page

AD8352

Rev. A | Page 12 of 20

800

RG (Ω)

100

200

300

400

500

600

700

Figure 24. Gain vs. RG, RL = 1 kΩ

00.5

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 only 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 (AVSingle-ended) for a given RG or RL.

430

)

(

)

(

500

⎟

⎠

⎞

⎜

⎝

⎛

−

ended

VSingle

(2)

where:

RL = single-ended load.

RG = 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 30 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

2NDS, 2V p-p OUT

–70

–80

–90

–100

2NDS, 1V p-p OUT

Figure 28. Single-Ended,

Second-Order Harmonic Distortion, 200 Ω Load

This broadband optimization was also performed at 180 MHz.

As with differential input drive, the resulting distortion levels

at lower frequencies are based on the CD and RD specified in

Table 7 and Table 8. As with differential input drive, relative

third-order reduction improvement at frequencies below

140 MHz are realized with proper selection of CD and RD.

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