LTC5510 datasheet(21/30 Pages) LINER

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LTC5510

5510fa

For more information www.linear.com/LTC5510

Figure 10. HF Board Output Schematic

5510 F10

OUT+

OUT–

OUT

VCC

APPLICATIONS INFORMATION

Figure 12. LF Board Output Schematic

Figure 11. Out Port Return Loss of HF Board (DC1983A).

Tuned for 1575MHz (a), and 2140MHz (b)

Table 6. OUT Port Component Values: LF Output Board (DC1984A)

FREQUENCY

(MHz)

RANGE*

(MHz)

L1, L2

(nH)

L4, L5

(nH)

5 to 325

–

0Ω

Mini-Circuits

TC4-1W-7ALN+

456

10 to 1300

–

Mini-Circuits

TC4-19LN+

* 12dB Return Loss Bandwidth

Table 5. OUT Port Component Values: HF Output Board (DC1983A)

FREQUENCY

(MHz)

RANGE*

(GHz)

L1, L2

(nH)

(pF)

1575

1.2 to 2.1

6.8

Anaren

BD1222J50200AHF

2140

1.6 to 2.5

5.6

Mini-Circuits

NCS4-232+

* 12dB Return Loss Bandwidth

FREQUENCY (MHz)

1000

–24

–6

–12

–18

2500

3000

1500

2000

5510 F11

VCC

5510 F12

OUT+

OUT–

OUT

LTC5510

C10

CapacitorC9canbeusedtoimprovetheimpedancematch.

The component values used for characterization are listed

in Table 5, along with the 12dB return loss bandwidths.

The measured return loss curves are plotted in Figure 11.

Output Matching: Low Frequency Output Board

Forloweroutputfrequencies,wire-woundtransformerspro-

videbetterperformance.Thelowfrequency(LF)evaluation

board(DC1984A)inFigure3(b)accommodatestheseappli-

cations.TheoutputmatchingtopologyisshowninFigure12.

Components L1, L2, L4 and L5 are used to tune the im-

pedance match, while T2 provides the desired impedance

transformation. C9 and C10 are used for DC blocking in

some applications. Table 6 lists component values used

for characterization, and the measured return loss perfor-

mance is plotted in Figure 13.

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