AD8345 datasheet(14/16 Pages) AD

14 / 16 page

REV. 0

AD8345

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CDMA IS95

For measuring ACPR, the I and Q input signals used were

generated with Pilot (Walsh Code 00), Sync (WC 32), Paging

(WC 01), and 6 Traffic (WC 08, 09, 10, 11, 12, 13) channels

active. Figure 14 shows the typical output spectrum for this

configuration.

For performing EVM, Rho, phase, and amplitude balance mea-

surements, the I and Q input signals used were generated with

only the Pilot Channel (Walsh Code 00) active.

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CENTER = 880MHz

SPAN = 7.5MHz

CH PWR = –12.41dBm

ACP UP = –72.8dB

ACP LOW = –72.8dB

Figure 14. Typical IS95 Output Spectrum

WCDMA 3GPP

For evaluating the AD8345 for WCDMA, the 3GPP standard

was used with a Chip Rate of 3.84 MHz. The plot in Figure 15

is an ACPR plot of the AD8345 using “Test Model 1” from the

3GPP specification with 64 channels active.

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CENTER = 380MHz

SPAN = 14.7MHz

CH PWR = –10.95dBm

ACP UP = –52.51dB

ACP LOW = –52.41dB

Figure 15. Typical AD8345 WCDMA 3GPP Output Spectrum

GSM

For comparing the AD8345 output to the GSM transmit mask I

and Q signals were generated using MSK modulation, GSM

differential coding, a Gaussian filter and a symbol rate of

270.833 kHz. The transmit mask was manually generated on

the FSIQ using the GSM BTS specification for reference. The

plot in Figure 16 shows that the AD8345 meets the GSM trans-

mit mask requirements.

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CENTER = 900MHz

SPAN = 1MHz

Figure 16. Typical AD8345 GSM Output Spectrum

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