ADL5906-EVALZ datasheet(21/30 Pages) AD

21 / 30 page

Data Sheet

ADL5906

THEORY OF OPERATION

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Rev. B | 21 of 30

Figure 50. Output Noise, Rise and Fall Times vs. CRMS Capacitance, Single-

Carrier W-CDMA (TM1-64) at 2.14 GHz with PIN = 0 dBm

Figure 50 also shows how the response time is affected by the

value of CRMS. To measure this, an RF burst at 2.14 GHz at 0 dBm

was applied to the ADL5906. The 10% to 90% rise time and 90% to

10% fall time were then measured.

Figure 51. Basic Connections for Operation in Measurement Mode

Table 5. Recommended Minimum CRMS Values for Various Modulation Schemes

Modulation/Standard

Peak Envelope

Power Ratio (dB)

Carrier Bandwidth

(MHz)

CRMSMIN (nF)

Output Noise

(mV p-p)

Rise/Fall

Time (µs)

QPSK, 5 MSPS (SQR COS Filter, α = 0.35)

3.8

0.2/10

QPSK ,15 MSPS (SQR COS Filter, α = 0.35)

3.8

0.2/10

64 QAM, 1 MSPS (SQR COS Filter, α = 0.35)

7.4

265

3/85

64 QAM, 5 MSPS (SQR COS Filter, α = 0.35)

7.4

380

0.2/10

64 QAM, 13 MSPS (SQR COS Filter, α = 0.35)

7.4

205

0.2/10

W-CDMA, One-Carrier, TM1-64

10.56

3.84

820

0.2/10

W-CDMA Four-Carrier, TM1-64, TM1-32, TM1-16, TM1-8

12.08

18.84

640

0.2/10

LTE, TM1, One-Carrier, 20 MHz (2048 QPSK Subcarriers)

11.58

140

0.2/10

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